Quote:
Originally Posted by fftoddster
if I am not mistaken if the valves are sealing good on the valve seats then no air would blow past so would not get to valve guides. I see how a leakdown test shows where you are loosing compression ie either rings or intake or exhaust valves but I do not see how it would help to show where oil is coming from.
With valves in block like the flathead wouldn't oil have to go up hill past valve guides to get into combustion chamber Vs overhead valve engines. Is oil getting past valve guides a real likely hood?
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Oil will run up that intake valve hill because of the vacuum. If it smokes worst on acceleration it is probably mostly rings. If it smokes bad when decelerating, it is probably valve guides.