Car smoking...

chuck943 said:

Please explain what intake manifold vacuum would have to do with this? Valve stem seals are not subject to much if any intake manifold vacuum.

Click to expand...

chuck943]if only smoking under wot could be valve stem seals [/quote] ... [QUOTE=chuck943 said:

yes there would be less vacuum in intake manifold at wot, but inside the combustion chamber it would be alot(like turning your vacuum cleaner from low to high speed). engine is nothing but a big air pump sucking air in pushing air out. when u go wot the pistons are pulling alot more air into the chambers. any oil film left on the valves would be pulled right off them into the chamber.

Click to expand...

chuck943 said:

Yeah vert u are right but, they will also give you a burst of smoke at wot also. Think about that for a minute,you have oil trying to leak past a seal and down the valve stem. When you go wot and get a quick big suction in combustion chamber it will pull any oil hanging there on in the cylinder.

Now I know he didn't say he was smoking at start up but maybe he is in the beginning stages and it maybe not bad enough that he has noticed it yet?

compression test and leakage test would tell him for sure.

Click to expand...

Bullitt95 said:

Worn valve stem oil seals (on new AFR heads???) would cause a puff of blue smoke from the exhaust when the vacuum in the intake manifold is high, and that's after you snap the throttle shut.

Click to expand...