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#61
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CENTER CARB 1966 389 engine (California carb) Lots of changes here
The 1966 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1966 Engines. I will post the Center Carb: 7036175 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. Air Horn Number: 7031588 (1) Venting: Internal 7007199 Vent Tube External Venting: Idle Vent Support: None Needle Seat: 7026305 Size: .120 Float Valve: 7022779 Pull Clip: 7006474 Float Assembly: 7012028 Spring: None Fuel Level: .625" at 6.0 psi Mech. Setting: .594" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7032280 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7025575 Length 3.06" Pump Jet: drill (2) Size: .028" Jet Location: In Cluster CAP cc/10 strokes: 18.0 - 21.0 Rod Set: .952 from air cleaner flange surface to top of pump rod (3*) Power Piston Assy: 7012266 act spring 7012265 Oz 8.5 Color (green) Power Valve Assy: 7011989 Power Rest: 7010141 Size: (.041) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 11 "Up" at: 8 all in at 6" hg MM. Jets: 312 cc, 60 degree, 7008661 "C" 7013333 Idle Compensator Assy: (140 degree (+ - 10 F) Opening Temp Choke Housing: (2*) (Some of the next 14 lines available for the Choke Description are blank) Here are the ones with Info: Valve No: 7033443 Angle: 20 degrees Cam No: 7020541 Choke Link: 7019524 Length: 2.671" wo Kick: .143 - .183 Second Step: .090 .100 Vacuum Break: 29 degrees + - 1.5 degrees (.214 - .238) Float Bowl (Finish) Float Bowl and Body Number: 7031625 (2*) Venturi Size: 1-3/16" Cluster: 7031293 (4*) Boost Size: 1/8 Nozzle: 7012877 rel .055 Idle Tube: 7011032 "C" Size: .032 Channel Rest: 7004520 Size: .048 Hi-Speed Bleed: drill (2) Size: .028 L.I.A.B: None Idle Bleed: None Top Bleed: .039 over idle tube Side Bleed: .033 Insert: (2) 7008866 (trumpet) Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7031291 Body & Bowl Assem: (blank) Thr Body No: 7031292 Bore: 1-11/16 Thr Valve: 7019299 Angle 10 degrees Idle Needle: 7029605 angle: 20 degrees Idle Needle Orifice: .074 - .078 Spark Port .030 x .090 loc. .045 + - .003 Top Valve Top corner Slot Port Punch Length: .250 Width: .030 Port Punch Loc: .243 Top Valve Top Slot Other: 7032290 throttle body gasket 7020778 thr shaft lever assy 7024885 throttle lever .096 hole in thr valve thr shaft offset .017 - .023 Spark Limits 3 Hg @ 1.1 lbs/min air min 12 Hg @ 2.3 lbs/min air min Test Specification 7022221 & 7022224 Min Air: .65/ lbs min Idle Air rate: 1.05 lbs min A.I.O Set Point 2.0 lbs min Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: 7013333 idle comp assy 140 degrees F + - 10 degrees F opening temp (1*) 7021007 air horn gasket 7031590 nut - fuel inlet bend pump lever tang to open idle vent with .020 gage between thr valve & bore on side opposite idle needle. (2*) 7033388 Screw "off idle" air adjust (3*) 7026097 vacuum break control assy 7026098 remote choke coil assy (4*) .026 dia hole aspirator to main well bleed date 3-19-1966 Customer 1966 2G Pontiac (Syn) CALIF. "389 Engine" A/C -Non A/C (center) Pow. Pak for Pow Pak assys 7026174 Model 7036175 Similar to 7026175 Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
The Following User Says Thank You to Tom Vaught For This Useful Post: | ||
#62
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Tom fantastic information, really enjoying this thread. Great work. Thank you
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Bill Strobel Owner Independent Towing 1965 GTO Nightwatch Blue/Aqua 2005 GTO Quick Silver/Red Fayetteville, NC Do It Right or Don't Do It All |
#63
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Quote:
Some may be easier, if the 1966 info matches the 1965 info. If so I will just re-post the info identifying it as 1965 info and same as 1966. Finally will do the 1964 info and follow same method as the 1965 info. If there are differences from 1966, I will post the exact info from the model year sheet. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#64
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Thanks for posting this detailed information. It is great resource material to have available. As an educator, "information is power".
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#65
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Thanks Mike.
421 MT Rear Carb Last one of the 1966 Listings. The 1966 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1966 Engines. I will post the Rear Carb: 7025079 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. Air Horn Number: 7013885 (1) Venting: Internal 3/16" dia hole in scoop External Venting: None Support: None Needle Seat: 7027846 Size: .086: Float Valve: 7022782 Pull Clip: 7006474 Float Assembly: 7012028 Spring: None Fuel Level: .730" at 6.0 psi Mech. Setting: .640" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7032280 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7029690 Length 2-3/4" Pump Jet: drill (2) Size: .030" Jet Location: In Cluster CAP cc/10 strokes: 16.5 - 19.5 Rod Set: .600 from air cleaner flange surface to top of pump rod Power Piston Assy: None act spring (blank) Oz Color (blank) Power Valve Assy: None Power Rest: None Size: (blank) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: (blank) "Up" at: (blank) MM. Jets: 446 cc, 60 degree, 7008673 "B" Choke Housing: None (The next 14 lines available for the Choke Description are blank) Float Bowl (Finish) Float Bowl and Body Number: 7029684 Venturi Size: 1-5/16" Cluster: 7016687 (4*) Boost Size: 1/8 Nozzle: 7015151 rel zero Idle Tube: None Size: (blank) Channel Rest: None Size: (blank) Hi-Speed Bleed: drill (2) Size: .034 L.I.A.B: None Idle Bleed: None Top Bleed: None Side Bleed: None Insert: (2) 7008866 (trumpet) Radial Tubes: (blank) Size: (blank) Crossover Chan: None Main Well Chan: None Throttle Body Assem: 7029685 Body & Bowl Assem: (blank) Thr Body No: 7025611 Bore: 1-11/16 Thr Valve: 7027791 Angle 15 degrees Idle Needle Orifice: All drilling info is blank So here is the last part of the document (mostly just final Info) Other: 7029686 thr shaft & lever assy 7015345 throttle body gasket Throttle Lever 7029688 thr shaft offset .027 - .033 no spark port info Test Specification 7022221 Min Air .95/ lbs min max Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: (1*) 7028757 pump shaft & lever assy, cast baffle in air horn, 7021007 air horn Remarks: (2*) 7013249 needle seat screen (3*) 7029689 throttle lever return spring "dag" treatment on throttle valves. throttle valves in vertical position at wot. (4*) 7024953 pump shooter deflector installed over cluster date 3-26-1966 Customer 1965-66 2G Pontiac 421 cu in Syn (Rear) Pow. Pak for Pow Pak assys 7025077 Model 7025079 Similar to 7024079 SEVERAL changes on this one TV Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#66
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So what were the changes from 1965 to 1966?
I will list the carb numbers for the 1965 carbs that are the same Calibration as the 1966 Carbs" Front A/T Carb: 7024178 Same for 1965 and 1966 389 Engines Front A/T Carb: 7024078 Same for 1965 and 1966 421 Engines Front M/T Carb: 7025178 Same for 1965 and 1966 389 Engines Front M/T Carb: 7025078 Same for 1965 and 1966 421 Engines Rear A/T Carb: 7024179 Same for 1965 and 1966 389 Engines Rear A/T Carb: 7024079 Same for 1965 and 1966 421 Engines Rear M/T Carb: 7025179 Same for 1965 and 1966 389 Engines Rear M/T Carb: 7025079 Same for 1965 and 1966 421 Engines 1965 TRI-POWER CENTER CARB UNIQUE PART NUMBERS TO BE POSTED The 1965 Center Carbs are a DIFFERENT Calibration vs the 1966 Center Carbs (I will post the SIX UNIQUE 1965 CENTER CARB CALIBRATIONS NEXT) The 1965 Center carb calibrations I will post are: 1965 Center A/T Carb: 7025173 389 Engines 1965 Center A/T Carb: 7025177 389 Engines 1965 Center A/T Carb: 7025074 421 Engines 1965 Center A/T Carb: 7025070 421 Engines 1965 Center M/T Carb: 7025175 389 Engines 1965 Center M/T Carb: 7025075 421 Engines Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#67
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Glad I started with the 1966 Tri-Power Carbs first.
I think 64 and 65 Center carbs are going to be painful to post. LOL! Here is the Carb Sheet for the 1965 Center Carb CENTER CARB 1965 389 engine The 1965 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1965 Engines. I will post the Center Carb: 7025173 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. Air Horn Number: 7017911 (1) Venting: Internal 7007199 Vent Tube External Venting: Idle Vent (1*) Support: None Needle Seat: 7026336 Size: .101 Float Valve: 7022783 Pull Clip: 7006474 Float Assembly: 7000273 Spring: None Fuel Level: .572" at 6.0 psi Mech. Setting: 1.234" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7019518 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7013998 Length 2.968" Pump Jet: drill (2) Size: .026" Jet Location: In Cluster CAP cc/10 strokes: 15.0 - 18.0 Rod Set: .880 from air cleaner flange surface to top of pump rod Power Piston Assy: 7006011 act spring 7006012 Oz 7.5 Color (yellow) Power Valve Assy: 7011989 Power Rest: 7010138 Size: (.038) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 9 "Up" at: 7 all in at 5" hg MM. Jets: 299 cc, 60 degree, 7008660 "B" 7013333 Idle Compensator Assy: (140 degree (+ - 10 F) Opening Temp .136 dia.comp. bleed hole thru T.B. Choke Housing: 7019476 (3*) bore 1/2 sleeve slot rel. .543 - .547 rest, front .187 rear .089 piston no. 7013888 rest none Valve No: 7007151 Angle: 20 degrees cover & coil assembly 7029583 coil 7006010 # 11 activity .398 - .422 rot torque .214 - .240 stat set index (4*) Fast idle adjust blank Cam No: 7016086 Choke Link: 7019528 Length: 2.473 wo Kick: .143 - .183 Second Step: .051 .061 Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C") Float Bowl (Finish) Float Bowl and Body Number: 7019931 Venturi Size: 1-1/4" Cluster: 7019937 Boost Size: 1/8 Nozzle: 7012362 (5*) zero Idle Tube: 7011032 "C" Size: .032 Channel Rest: 7011523 Size: .046 Hi-Speed Bleed: drill (2) Size: .026 Dome Vent: drill (2) Size: .028 Idle Bleed: None Top Bleed: .038 over idle tube Side Bleed: none Deflector: (2) 7009098 Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7020784 Body & Bowl Assem: (blank) Thr Body No: 7019343 Bore: 1-7/16 Thr Valve: 7013795 Angle 11 degrees Idle Needle: 7013116 angle: 15 degrees Idle Needle Orifice: .070 - .002 Spark: none Port Punch Length: Width: Port Punch Loc: Other: 7020783 throttle shaft lever assy 7013680 vented throttle body gasket .081 dia hole in thr valve Thr Lever: 7024885 thr shaft offset .017 - .023 Spark Limits blank Test Specification 7022221 Idle Air rate: .79 lbs min Min Air: .5 lbs min Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy, 7002075 link 7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle. (2*) 7006079 needle seat screen (3*) 7019477 baffle in hsg. .053 dia hole in baffle. (4*) Choke should just close at 75 degrees F when set on Index. (5*) 7000291 defusser in nozzle. (6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002 (7*) Bottom Slot .032 +/- .004 below top of shaft Note: 7028797 vac switch assy Adj to obtain 1.088 +/- .010 bet top of bosses on movable lever & top of switch at W.O.T. date 6-11-1964 Customer 1965 2GC Pont. Pow. Pak. "389 Engine" Idle Comp (center) auto 7025172 Pow. Pak Assy 7025173 - Center 7025178 - Front 7025179 rear Model 7025173 Similar to 7024173 This sheet is the most complicated of any calibration sheet I have looked at so far from Rochester Products. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#68
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CENTER CARB 1965 389 engine
(very minor changes vs the other 1965 center carb sheet I posted) The 1965 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1965 Engines. I will post the Center Carb: 7025177 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. The second of the 1965 Center Carb Calibrations Air Horn Number: 7017911 (1*) Venting: Internal 7007199 Vent Tube External Venting: Idle Vent (1*) Support: None Needle Seat: 7026336 (2*) Size: .101 Float Valve: 7022783 Pull Clip: 7006474 Float Assembly: 7000273 Spring: None Fuel Level: .572" at 6.0 psi Mech. Setting: 1.234" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7019518 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7013998 Length 2.968" Pump Jet: drill (2) Size: .026" Jet Location: In Cluster CAP cc/10 strokes: 15.0 - 18.0 Rod Set: .880 from air cleaner flange surface to top of pump rod Power Piston Assy: 7006011 act spring 7006012 Oz 7.5 Color (yellow) Power Valve Assy: 7011989 Power Rest: 7010138 Size: (.038) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 9 "Up" at: 7 all in at 5" hg MM. Jets: 299 cc, 60 degree, 7008660 "B" 7013333 Idle Compensator Assy: (140 degree (+ - 10 F) Opening Temp .136 dia.comp. bleed hole thru T.B. Choke Housing: 7019476 (3*) bore 1/2 sleeve slot rel. .543 - .547 rest, front .187 rear .089 piston no. 7013888 rest none Valve No: 7007151 Angle: 20 degrees cover & coil assembly 7029583 coil 7006010 # 11 activity .398 - .422 rot torque .214 - .240 stat set index (4*) Fast idle adjust blank Cam No: 7016086 Choke Link: 7019528 Length: 2.473 wo Kick: .143 - .183 Second Step: .051 .061 Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C") Float Bowl (Finish) Float Bowl and Body Number: 7019931 Venturi Size: 1-1/4" Cluster: 7019937 Boost Size: 1/8 Nozzle: 7012362 (5*) zero Idle Tube: 7011032 "C" Size: .032 Channel Rest: 7011523 Size: .046 Hi-Speed Bleed: drill (2) Size: .026 Dome Vent: drill (2) Size: .028 Idle Bleed: None Top Bleed: .038 over idle tube Side Bleed: none Deflector: (2) 7009098 Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7020784 (6*) Body & Bowl Assem: (blank) Thr Body No: 7019343 Bore: 1-7/16 Thr Valve: 7013795 Angle 11 degrees Idle Needle: 7013116 angle: 15 degrees Idle Needle Orifice: .070 - .002 1st Drilling: .031 +/- .002 (7*) Spark: none Port Punch Length: Width: Port Punch Loc: Other: 7020783 throttle shaft lever assy 7013680 vented throttle body gasket .081 dia hole in thr valve Thr Lever: 7024885 thr shaft offset .017 - .023 Spark Limits blank Test Specification 7022221 Idle Air rate: .79 lbs min Min Air: .50 lbs min Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy, 7002075 link 7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle. (2*) 7006079 needle seat screen (3*) 7019477 baffle in hsg. .063 dia hole in baffle. (4*) Choke should just close at 75 degrees F when set on Index. (5*) 7000291 defusser in nozzle. (6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002 (7*) Bottom Slot .032 +/- .004 below top of shaft Note: 7029693 vac switch assy Adj to obtain 1.100 +/- .010 bet top of bosses on movable lever & top of switch at W.O.T. date 6-3-1964 Customer 1965 2GC Pont. Pow. Pak. "389 Engine" Idle Comp (center) auto 7025172 Pow. Pak Assy 7025177 - Center 7025178 - Front 7025178 rear Model 7025177 Similar to 7025173 This sheet is (except for 3 of 4 minor changes) is the same as the previous sheet I posted. The difference being this sheet pre-dates the other 1965 center carb sheet I posted by about 8 days. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#69
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CENTER CARB 1965 389 engine
The 1965 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1965 Engines. This is the last Center Carb sheet for the 1965 389 Tri-Power Induction Systems I will post the Center Carb: 7025175 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. The second of the 1965 Center Carb Calibrations Air Horn Number: 7017911 (1*) Venting: Internal 7007199 Vent Tube External Venting: Idle Vent Support: None Needle Seat: 7026336 (2*) Size: .101 Float Valve: 7022783 Pull Clip: 7006474 Float Assembly: 7000273 Spring: None Fuel Level: .572" at 6.0 psi Mech. Setting: 1.234" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7019518 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7013998 Length 2.968" Pump Jet: drill (2) Size: .026" Jet Location: In Cluster CAP cc/10 strokes: 15.0 - 18.0 Rod Set: .880 from air cleaner flange surface to top of pump rod Power Piston Assy: 7011478 burnished piston Act Spring 7005841 Oz 8 Color (white) Power Valve Assy: 7017950 Power Rest: 7010131 Size: (.031) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 9 "Up" at: 7 hg MM. Jets: 330 cc, 60 degree, 7008663 "B" Idle Compensator Assy: none Choke Housing: 7019587 (3*) bore 1/2 sleeve slot rel. .573 - .577 rest, front .187 rear .089 piston no. 7013888 rest none Valve No: 7007151 Angle: 20 degrees cover & coil assembly 7019660 coil 7006894 # 12 activity .388 - .412 rot torque .1975 - .2225 stat set index (4*) Fast idle adjust blank Cam No: 7016086 Choke Link: 7019528 Length: 2.473 wo Kick: .143 - .183 Second Step: .051 .061 Vacuum Break: 23 degrees + - 3 degrees (EMI -19 method "C") Float Bowl (Finish) Float Bowl and Body Number: 7019928 Venturi Size: 1-1/4" Cluster: 7019937 Boost Size: 1/8 Nozzle: 7012362 (5*) zero Idle Tube: 7011033 "C" Size: .033 Channel Rest: 7009246 Size: .044 Hi-Speed Bleed: drill (2) Size: .026 Dome Vent: drill (2) Size: .028 Idle Bleed: None Top Bleed: .038 over idle tube Side Bleed: none Deflector: (2) 7009098 Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7029351 (6*) Body & Bowl Assem: 7029352 Thr Body No: 7029352 Bore: 1-7/16 Thr Valve: 7010178 Angle 11 degrees Idle Needle: 7013116 angle: 15 degrees Idle Needle Orifice: .068 - .072 1st Drilling: .029 - .033 (7*) Spark: none Port Punch Length: Width: Port Punch Loc: Other: 7020783 throttle shaft lever assy 7015148 throttle body gasket Thr Lever: 7024885 thr shaft offset .017 - .023 Spark Limits blank Test Specification 7022221 Min Air: .25 lbs min Idle Air rate: .80 lbs min Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy, 7002075 link 7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle. (2*) 7006079 needle seat screen (3*) 7019477 baffle in hsg. .063 dia hole in baffle. (4*) Choke should just close at 75 degrees F when set on Index. (5*) 7000291 defusser in nozzle. (6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002 (7*) Bottom Slot .057 +/- .004 below top of shaft Note: 7028797 vac switch assy Adj to obtain 1.088 +/- .010 bet top of bosses on movable lever & top of switch at W.O.T. date 6-11-1964 SAE 1-1/4" Spec 2 Customer 1965 2GC Pont. Pow. Pak. "289 Engine" (center) Syn. (They made a typo on the engine size) 7025174 Pow. Pak Assy 7025175 - Center 7025178 - Front 7025179 rear Model 7025175 Similar to 7024175 This sheet has a lot of changes and is more like the 1st 1965 389 sheet I posted So the production order would be 2nd sheet, then 1st sheet, and now this sheet. Tom V. This completes the 1965 389 Calibration Sheets, I will start on the 1965 421 sheets tomorrow.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#70
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Tom,
Thank you for posting all of this information! Could these specs help determine the cfm of these Tripowers? Thanks, Don
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1966 GTO 1966 421-9.3-1 comp-Race Tec 23cc Pistons 1966 Tri-Power 1967 670 Heads Pontiac "Highlift" TriPower Cam by SpeedPro DUR 214 Int 224 Exh @.050 - 107 ICL LIFT .445" Int .465" Exh Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers 1966 Muncie Wide Ratio 4-Speed 1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears |
#71
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These specs are calibration specs.
When a 1964 or 1965 2GC Center Carb goes on the Rochester Products "Air Box", (the carb is installed inside an actual box, no air cleaner, and with Stoddard Solvent running thru the fuel passages), you get a flow number that has to meet a given specification at a minimum air flow in pounds of air mass per minute. Same deal for the 2G End Carbs on all 3 years and the Center Carb on the 1966 engines. The specs are right on the sheets. A Holley or Rochester Products Flow Stand is not the same thing as a Superflow Flow Bench that only passes air thru the carb. The Holley and Rochester Products Flow Stands SIMULATED the actual carb running on a engine at a given rpm (CFM) point. Be it Idle Conditions, or under other conditions. Engine Dynometers were used to verify running engine carburetor performance using fuel flow rates thru the carb, air flow rates thru the test cell, and exhaust gas analyser information coming out of the exhaust. So a CFM "Number" means little on a Engineering Build Sheet. They do list Pounds per Minute (Air Mass) specs though to make sure the Idle air/fuel is correct for the engine to idle properly. Sean Murphy, former employer of Brad Urban, friend of Tom S, owner of Sean Murphy Induction, did a article on Rochester 2 BBL carbs about 10 years ago. Here is the link. It talks about Carb CFM because racers like to talk to cfm numbers. Carb Engineers, be them Holley Engineers or Rochester Engineers talk in lbs/min of idle air flow and Air Box "set points". https://www.hotrod.com/articles/ctrp...g-carburetors/ I am diverging from posting the normal info, because the info I have been posting tells Carb Engineers, Rochester Products Engineers in this case, how to test on a Engineering Carb Test Stand a given carb to make sure it was acceptable for production. Before people started racing carb CFM (vs actual Pounds per Minute of airflow at a agreed-upon test point), a Holley Air Box could test a Rochester 2 BBL and compare it to a Holley 2 BBL as far as pounds of air mass (using Stoddard Solvent as the fuel) one carb vs the other. Then the CFM racing started. Autolite had their Carb Test Stands, Holley had theirs, (both at the Engineering Locations and at the Carb Build Plants. Rochester basically did their Engineering/Testing in Rochester N.Y. Read Sean's article, he is a good carb guy, better than most. Tom V No more History Lessons until I get all of the sheets posted.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
The Following User Says Thank You to Tom Vaught For This Useful Post: | ||
#72
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7026074 Carb, Kenth look at the top of the sheets, the first few lines of info.
Each specific carb number is listed there vs looking at the bottom of the page which is confusing in its statements at times. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#73
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CENTER CARB 1965 421 engine
The 1965 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1965 Engines. This is the first Center Carb sheet for the 1965 421 Tri-Power Induction Systems I will post the Center Carb: 7025070 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. The first of the 1965 Center Carb Calibrations The date on this carb sheet is 9/24/1964 Air Horn Number: 7017911 (1*) Venting: Internal 7008915 Vent Tube External Venting: Idle Vent Support: None Needle Seat: 7026336 (2*) Size: .101 Float Valve: 7022783 Pull Clip: 7006474 Float Assembly: 7000273 Spring: None Fuel Level: .572" at 6.0 psi Mech. Setting: 1.234" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7019518 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7013998 Length 2.968" Pump Jet: drill (2) Size: .026" Jet Location: In Cluster CAP cc/10 strokes: 15.0 - 18.0 Rod Set: .880 from air cleaner flange surface to top of pump rod Power Piston Assy: 7006011 Act Spring 7006012 Oz 7.5 Color (yellow) Power Valve Assy: 7011989 Power Rest: 7010136 Size: (.036) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 9 "Up" at: 7 hg MM. Jets: 299 cc, 60 degree, 7008660 "B" Idle Compensator Assy: 7013333 (140 degrees F +/- 10 degrees Opening Temp Choke Housing: 7019476 (3*) bore 1/2 sleeve slot rel. .543 - .547 rest, front .187 rear .089 piston no. 7013888 rest none Valve No: 7007151 Angle: 20 degrees cover & coil assembly 7029583 coil 7006010 # 11 activity .388 - .422 rot torque .210 - .240 stat set index (4*) Fast idle adjust blank Cam No: 7016086 Choke Rod: 7019528 Length: 2.473 wo Kick: .143 - .183 Second Step: .051 .061 Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C") Float Bowl (Finish) Float Bowl and Body Number: 7019931 Venturi Size: 1-1/4" Cluster: 7019937 Boost Size: 1/8 Nozzle: 7012362 (5*) zero Idle Tube: 7011029 "C" Size: .029 Channel Rest: 7008545 Size: .055 Hi-Speed Bleed: drill (2) Size: .026 Dome Vent: drill (2) Size: .028 Idle Bleed: None Top Bleed: .038 over idle tube Side Bleed: none Deflector: (2) 7009098 Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7020784 (6*) Body & Bowl Assem: Thr Body No: 7019343 Bore: 1-7/16 Thr Valve: 7013795 Angle 11 degrees Idle Needle: 7013116 angle: 15 degrees Idle Needle Orifice: .068 - .072 1st Drilling: .029 - .033 (7*) Spark: none Port Punch Length: Width: Port Punch Loc: Other: 7020783 throttle shaft lever assy 7013680 throttle body gasket Thr Lever: 7024885 .081 dia hole thru throttle valve thr shaft offset .017 - .023 Spark Limits blank Test Specification 7022221 Min Air: .50 lbs min Idle Air rate: .82 lbs min Box Balance 18" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: (1*) 7015108 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy, 7002075 link 7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle. (2*) 7006079 needle seat screen (3*) 7019477 baffle in hsg. .063 dia hole in baffle. (4*) Choke should just close at 75 degrees F when set on Index. (5*) 7000291 defusser in nozzle. (6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002 (7*) Bottom Slot .032 +/- .004 below top of shaft Note: 7029693 vac switch assy Adj to obtain 1.100 +/- .010 bet top of bosses on movable lever & top of switch at W.O.T. date 9-24-1964 SAE 1-1/4" Spec 1 Customer 1965 2GC Pont. Pow. Pak. 421 Engine (center) A/T 7025169 Pow. Pak Assy 7025070 - Center 7024078 - Front 7024079 rear Model 7025070 Similar to 7025074 This sheet has a lot of changes and is more like the 1st 1965 389 sheet I posted So the production order would be 2nd sheet, then 1st sheet, and now this sheet. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#74
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The specs in your post on the 7026074 correlates more to the 7026075 389/421 M/T center carb which uses #62 main jets an no holes in the throttle blades? |
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Errors on this large amount of information CAN happen during the initial phase. Patience and we will have accurate information. Thanks Kenth for identifying the errors identified in my typing to date. Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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Taking a long week-end so see you on Tuesday as far as new info on the Tri-Power post.
I might communicate/view occasionally, on my phone, but no capability to do the large spreadsheets for the Tri-Power carbs Information. It will be a few days before new info. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
The Following User Says Thank You to Tom Vaught For This Useful Post: | ||
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Doing errands for people in the neighborhood, Tri-Power stuff is far down on the list.
Will try to do more on it down the road after this Virus mess in worked out for the people in the community. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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Maybe by Saturday Morning I can get back on the carb sheets. Be Safe out there.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#80
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Back at it as promised.
I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7024178 is correct (as previously posted) in Posts # 32 and # 33 of this information. Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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