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#21
09-26-2013, 12:33 PM
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You have a video of the pull(s)?
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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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#22
09-26-2013, 12:34 PM
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Secondaries hanging on the spacer?
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https://www.facebook.com/Outlaw-Vint...7899333725868/ |
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#23
09-26-2013, 12:55 PM
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I'm not sure how to read BSFC or fuel lb/hr, and AF ratio seemed to be off some to me (with my minor knowledge of the subject)
Fuel supply checked out OK, was using Gasoline 91 octane. No banana, no spuds, fuel system working fine. Engine dyno, power low even for chassis dyno, but that does eliminate alot of possibilities. I was already stressed out since first time on dyno with new engine, Header flanges too big and hit the block so had to be machined off, water crossover leak, rear main leaking, and trying to get to the dragstrip the next weekend (which I missed due to other issues) After 5 pulls, playing with timing, different carb etc. Pulled valve covers and everything seemed normal.
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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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#24
09-26-2013, 12:57 PM
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No carb problems (at least at this point)
No videos, I think I was too nervous and just forgot.
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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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#25
09-26-2013, 01:01 PM
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Wired distributor cap wrong?
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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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#26
09-26-2013, 01:13 PM
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My first thought is the cam wasn't degreed, I lost over 100 hp that way once, but the banana in the tail pipe seems as good a theory as any.
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https://www.facebook.com/Outlaw-Vint...7899333725868/ |
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#27
09-26-2013, 01:24 PM
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Wrong header gaskets
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#28
09-26-2013, 01:27 PM
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Based on fuel/lean apparent issues....vacuum leak? Forget to plug something or left off the carb gasket?
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#29
09-26-2013, 01:40 PM
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Did you do a cranking compression test? If so what were the numbers.
Did you do a leak down test? If so what were the numbers. Stan
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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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#30
09-26-2013, 01:59 PM
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I'm going to guess the throttle linkage wasn't adjusted correctly. Are you going to show us the dyno sheet from a good pull?
Glenn |
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#31
09-26-2013, 03:06 PM
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I have seen valve lash done alot of different ways. I did not do it on this engine but the way I do it I think I would have found the problem prior to dyno. Hydraulic roller cam. After pulling valve covers and plugs, builder pulled out cam card and called his cam distributer but he was gone for the day already as was late on a Friday.
 There may be a hint in there somewhere. Triple checked plug wires. Cam was degreed properly. Checked for vacuum leaks none found. Pulled plugs and couple looked lean, almost nonfiring but no comp or leakdown tested. Throttle linkage was off some on first pull, but nothing changed power wise. Good pull sheet coming.
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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 Last edited by Curious George; 09-26-2013 at 03:36 PM. |
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#32
09-26-2013, 03:11 PM
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Wrong rocker ratio?
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https://www.facebook.com/Outlaw-Vint...7899333725868/ |
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#33
09-26-2013, 03:27 PM
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0.050" cold lash on the hydraulic cam ???
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Working on going faster (and now staying dry at the same time !!) |
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#34
09-26-2013, 03:32 PM
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Quote:
Quote:
If it was'nt the rocker arm adjustment,it could've been something like the wrong length pushrods too. That's not entirely uncommon with HR cams as they typically require shorter pushrods as SOP due to the taller HR lifters,also they can also be somewhat harder to check for length as well. I dont see anything inherently wrong with the cam card myself. Unless someone ignored/misunderstood the ".050" check @ lifter" bit...  Bret P. |
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#35
09-26-2013, 03:32 PM
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Right rockers, correct lash and pushrods.
Other than an oil leak, there wasn't really anything mechanically wrong with the engine or its components.
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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 Last edited by Curious George; 09-26-2013 at 03:40 PM. |
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#36
09-26-2013, 03:37 PM
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where do you see .050 cold lash ??????
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#37
09-26-2013, 03:40 PM
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Kinda odd that he lists the BC info on the cam card though...
Like who would know if that's even what it's supposed to be or not??? Anyhow,were the BC wrong,that too could lead to problems much the same as incorrect valve adjustment or the wrong length pushrods would. All boils down to valves open when they should'nt be. What else is left?  Bret P. |
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#38
09-26-2013, 03:59 PM
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4/7 switch cam and you didn't wire it that way?
__________________
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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#39
09-26-2013, 04:17 PM
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Quote:
The 2 plugs that looked different than the rest were numbers 4 and 7. That didn't register with me at first and that's when builder wanted to double check the cam card. We did not order the 4/7 swap and was not labeled on cam or card. At idle we pulled off plugwires and # 4 & 7 made no difference but the rest all acted like a plug wire was off. Swapped wires on disributor and BINGO! 
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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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#40
09-26-2013, 04:38 PM
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whooosh
i had an exact same scenario come in once BBC Vega   
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 someone who thinks logically is a nice contrast to the real world.http://www.youtube.com/watch?v=3FfKVVZW1-Y |
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