Re: SC head

Posted by El Toro on December 27, 2005 at 11:06:20 from (64.12.117.13):

In Reply to: SC head posted by stu in njo on December 27, 2005 at 09:26:52:

Have you ran a compression check? High intake
manifold vacuum may be pulling oil past your valves. The guides may be worn. I had an engine with broken rings. It never smoked and no oil from the exhaust. It did have a lot of blowby and it sounded as if the compression was blowing into crankcase.

When I pulled the head I saw what was causing this. The ring or rings had broken and had cut a groove into the cylinder wall. The compression
was blowing down that groove. A big notch in the piston too. This engine never missed, I did hear
a little noise from the engine. I pulled the engine and had it rebored oversize. Ran like a new one after that. Cost about $600.00 for parts & machining. Hal

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