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#1
09-26-2013, 12:04 AM
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What seems to be the problem?
498 CID
[IMG]  [/IMG]
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Whitmore 462, 670 heads 10.55@125 Same with 310 E D-ports 10.12@131 498 w/single 88 8.53@158 |
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#2
09-26-2013, 12:14 AM
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Needs fuel. And pull it higher.
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John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
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#3
09-26-2013, 12:18 AM
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.5++ BSFC at lower rpm with that lean A/F ? sounds like it wants way more timing to.
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John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
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#4
09-26-2013, 01:01 AM
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@ 5200
► 14.38 A/F * (53.2 Fuel A lbs/hr + 81.3 Fuel B lbs/hr) = 1934.11 lbs/hr mass air flow (about the 423 scfm shown) which is about 56.5 VE Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#5
09-26-2013, 01:19 AM
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Accidentally posted before all information was in. This was my version of first dyno experience where power was down from where expected. 498 cid, 9.3 compression, Butler ED heads, 240's cam/.600 lift. Did not pull past 5200 as something did not seem right. Added 5 degrees timing, no change. Minus 5 degrees timing, no change. Swap to known good carb, lost 10 hp.
__________________
Whitmore 462, 670 heads 10.55@125 Same with 310 E D-ports 10.12@131 498 w/single 88 8.53@158 |
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#6
09-26-2013, 01:28 AM
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So Stan this is like puzzle
what causes the ve to be that low?
__________________
 someone who thinks logically is a nice contrast to the real world.http://www.youtube.com/watch?v=3FfKVVZW1-Y |
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#7
09-26-2013, 02:05 AM
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Feel free to ask questions or guess as to what problem may be. Just thought it would be fun to see if anyone can figure out problem was.
__________________
Whitmore 462, 670 heads 10.55@125 Same with 310 E D-ports 10.12@131 498 w/single 88 8.53@158 |
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#8
09-26-2013, 03:35 AM
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Down to .381 lb./HP-hr @ 5,200? Something seems wrong in the valvetrain. Is cam phasing considerably away from split-overlap?
Or- something terribly wrong on the fuel-supply side?
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} 
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#9
09-26-2013, 04:15 AM
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Quote:
 Trying to trick us into making fools of ourselves? Some of us dont need any help to do that,LOL. Whatever it was it looks like it was absolutely killing the engines VE. I dunno,my WAG,incorrect cam timing -or- improperly adjusted rockers? Valves open when they should'nt be can defintely do stuff like that. What do we win if we guess correctly??? Bret P. |
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#10
09-26-2013, 07:22 AM
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Very interesting that whoever was running the dyno chose to end the pull very close to the 5250 rpm point!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
09-26-2013, 07:25 AM
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Banana in the tailpipe?
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#12
09-26-2013, 07:38 AM
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I`ve used a half baked large potato to stop a friends car from starting once as a joke, quite effective with a single exh!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#13
09-26-2013, 09:16 AM
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Quote:
14.38 * 81.3 * 2 = 2338.188 lbs/hr mass air flow - This would be between 69 and 70% VE. Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#14
09-26-2013, 09:22 AM
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Forgot to turn the fuel pump on?
Fuel tank on ground and pump can't suck the fuel up? Fuel line about 1/4" diameter? Fuel Regulator not working? Vent line clogged?  Also what fuel? Gas, E85, Alcohol? Probably a 1000 things it could be, need a lot more data.
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#15
09-26-2013, 09:33 AM
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Also, the BSFC don't seem to compute correctly from the Air and fuel used?
( I get like .219 for 5000RPM?) Was the dyno hooked up?  Was it a car dyno or an engine dyno?
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#16
09-26-2013, 09:52 AM
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Quote:
__________________
someone who thinks logically is a nice contrast to the real world.http://www.youtube.com/watch?v=3FfKVVZW1-Y |
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#17
09-26-2013, 09:52 AM
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Quote:
► (53.2 + 81.3) / .381 = 353.0183727034121 Uncorrected HP @ 5200 ► 379.7 / 353.0183727034121 = 1.075581412639405 Dyno correction factor Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#18
09-26-2013, 10:09 AM
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Who's dyno you on?
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************************************* 463 SRP .035 Pistons, Eagle rods, N crank, Pump gas, Victor intake, Holley 850BT carb, 6H heads,TH400 w/T-Break, Continental custom 3500 converter, 3.73 gears. TV7101 TURBO! 
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#19
09-26-2013, 10:16 AM
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Thanks, Stan.
I was using just one of the fuel data. Why are there 2 read outs on the fuel? 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#20
09-26-2013, 12:29 PM
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Quote:
If you guess correctly, you win my eternal respect? LOL.
__________________
Whitmore 462, 670 heads 10.55@125 Same with 310 E D-ports 10.12@131 498 w/single 88 8.53@158 |
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