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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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I'll be the heretic and ask another tough question. The ZDDP additives are important for high-point-load applications, and we seem to say the cam/rocker-foot interface is such a point in our cars. However, from other sources discussing other topics.... I seem to recall a small factoid like this---> that American V-8 muscle cars, with their high-inertia valvetrain using push-rods and such.... NEED high valve spring pressure to prevent valve float at high RPM's. In contrast, our rather sophisticated SOHC engines have much less valve train inertia....and therefore can get by with much less spring pressure. I can't confirm , but something like 60 pounds pressure vs a hi-po domestic V-8 needing 100-120 lbs. Anyone close to this topic care to confirm?
If so....are "our" engines the ones that NEED the high levels of ZDDP afterall?.
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Wil Ferch
85 Carrera ( gone, but not forgotten )
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