[Spridgets] valve guide smoke?
dbl at chicagolandmgclub.com
Thu Apr 3 18:51:15 MST 2008
>> Joe Lansing wrote:
>> Is there a way to tell if a smoking engine has bad
>> rings vs bad valve guides?
> A simple test is to see if it smokes at idle or when you let off the
> gas, it's guides.
> If it smokes when you accelerate, it's rings.
> Smoke coming from the push rod holes is just crankcase pressure.
Yup, as Frank says, if the valve guides are bad, it will smoke whenever
manifold vacuum is high, because the vacuum in the cylinders is sucking oil
right past the valves.
If the rings are bad, it will tend to smoke when the pressure in the
cylinder is the greatest and it pushes right past the rings.
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