[JWA]

I finally got around to doing the comp. check on my engine (using oil/smoke when you get on it hard). Dry the reading for all 8 cyls. was 180psi +/- 5 psi. With a squirt of oil each cylinder(all 8) rose to 240psi. Now my deduction is even after 3000 mile my rings(moly) have not seated. Is this possible? I ran Valvoline 10w-40 changed @break in,100 miles, 500 miles,1000 miles. At 2000 miles I switched to 20w-50. Am I missing somethig here? Any ideas? Also the plugs AC/Delco rapid fire #4's look fine. Thanks for any suggestions. If I pull its getting a stroker kit(496)......

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Jeff ACES#841 TCG#158
68 SS396(454)
68 L78 Project
87 MC SS

 

[Harley]

That smoke, when you get on it hard, may be fuel. Does it smoke when you let off the throttle?

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Harley
69 461 El Camino Nitrous Model, 69 Chevelle coupe
70 El Camino,71 SS Camaro
75 L-82 Corvette,71 Gremlin X
Kerrville,Tx.

 

[JWA]

Harley

No smoke when I let off the throttle.

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Jeff ACES#841 TCG#158
68 SS396(454)
68 L78 Project
87 MC SS

 

[Harley]

Sounds to me like you're over carburated or jetted. There are guys here that have a better grasp of carbs than I do. Ask around.
Also may be running out of spark energy on the top?

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Harley
69 461 El Camino Nitrous Model, 69 Chevelle coupe
70 El Camino,71 SS Camaro
75 L-82 Corvette,71 Gremlin X
Kerrville,Tx.

 

[JWA]

Yes the car does fall flat on its face in 3rd gear going hard. i don't think my problem is jets though. Carb had 65/95 and I jetted down to 64/84 (it ran better at the top end with the first set but it does not smoke as bad as it did. The setup is:
454 +.40,
KB 203 pistons,
CC O-port heads with big valves/pocket ported,(96cc)
800 holley Dp spreadbore, Performer RPM Qjet,Comp Cams 280 magnum, TH400-2500 stall,3:55 gears. Anybody know about the compression issue-wet v dry difference?
Thanks again.



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Jeff ACES#841 TCG#158
68 SS396(454)
68 L78 Project
87 MC SS

 

[zioFrank]

While you can loose oil and get smoke, that's not an indication of "burning" oil. First, what color is the smoke? Usually, blueish smoke is oil, black/dark smoke is carb running rich. Determine this first, then work out the other kinks.

Bye the way, no matter how well the rings seat, puting oil down the cylinders "always" jacks up the compression. The old rule was, if cylinders were within 5-10% of each other you were OK. Also, you can't go by the amount of pressure alone. You don't normally burn oil as a result of rings, it's usually due to worn out guides (oil is "sucked" passed them). With rings you normally get "blow by", this would be more visible through the oil filler or valve cover breather.

Good luck.

Francis