Quote:
Originally Posted by bgkast
They are indirectly related. Other things like valve stem seals can also cause blow by.
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How are they indirectly related? Blowby is caused by air leaking around the rings or valves. Right? So checking the compression tells how much pressure is leaking around the rings and valves too. How do valve stems cause blowby? Does it have to leak past the valve first to get by the valve stem?