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#261
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It ran fine, but it pushed oil into the air cleaner from the valve cover breather. The cam and rings were planned before the engine came apart.
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#262
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Sounds like it just had bad blow by time for rings at minimum.
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#263
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I’d say just honing and putting new rings in plus adding more cam, which would have created more power. Didn’t work and won’t in doing it all over again. I would bit the bullet, and go .030 with new pistons and rings, also would put some good valve seals in there and get rid of the O’rings. Or else you’ll be chasing your tail.
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#264
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The new cam created more dynamic pressure. ( compression) just adding to your issues and new rings didn’t really do much. I’m thinking what ever your piston to wall clearances were or are now isn’t good, new rings may of help temporarily. Also thinking if all was ok initially it would’ve been short lived. Its just not sealing up, weather is the rings or valve seals, or A combination of both….just honing and putting in new rings is like a coin toss.
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#265
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#266
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#267
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#268
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Blowing oil in to air cleaner, from valve cover breather… that’s usually blow by. did you replace the PVC valve at anytime. I don’t know I’m lost on what else to tell you. Good luck.
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#269
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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 |
#270
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no, all intake runners are wet with oil, I think it was getting oil through the pcv system. the pcv port on the carb did have some oil in it. The inboard exhaust ports do have the crossover on the intake, maybe that has something to do with it
Last edited by Shockwave78; 08-13-2023 at 07:03 PM. |
#271
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Still think the (intakes at least?) valves were not closing fully, and when coming up on compression it was blowing back into the intake.
Probably not a lot of leakage but any amount will cause this?
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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 |
#272
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Possible ?
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#273
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Seems unlikely to hang a valve open enough to do what you're saying and still pump 150psi.
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#274
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Any intake valves that where not closing properly, yet the cylinders firing would have made for back fires being heard out the Carb, especially when you put your foot in it,BTDT!
Did the op have plugs that where not firing? I forget. The one major thing here that will have many different repercussions is that for whatever reason the amount of run time on the motor in its poor state was enough to get the engine oil to smell of fuel, so this was either due to 1) cylinders not firing. 2) a Carb problem. 3) or both combined! Also low vacuum in and of itself would have made for a rich condition. Diluted engine oil combined with blowby will make a mess of things, I have seen this in many a high mileage SBC motors that should have been rebuilt the right way, that there owners just re-ringed and stuff in a 250 duration Cam and a 850 Carb while the delusion of then having a 11 second car.
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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! |
#275
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I'll say it again. The most plausible explanation is that the timing chain was installed wrong, using the wrong mark on the multiple keyway crank gear. Easy mistake to use the mark over the crank keyway rather than the correct one. It will retard the camshaft and cause a big loss in power. Seen it multiple times on customer's cars.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#276
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The only way that cam could show the cranking compression it did, in that engine, and the cam was well retarded, is if his CR was 9.0:1 or higher. 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 |
The Following User Says Thank You to Stan Weiss For This Useful Post: | ||
#277
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I guess I look at what is going on here totally different than you do. When first put together it had 15" of vacuum. Which should have not caused any problems. It is a 400 ci with a 270/277 Adv 210/221 @ 0.050" cam. I am sure no delusion of even having a 12 second car I am still not sure that it did have a ring seal problem. 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 |
#278
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The Following User Says Thank You to Shockwave78 For This Useful Post: | ||
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