| Re: [GMCnet] oil again [message #119457] |
Mon, 21 March 2011 15:15  |
Gary Casey
Messages: 448
Registered: September 2009
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Senior Member |
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I'm far from being an expert in ZDDP, but all this talk about flat tappets
leaves me confused. Many, many new automotive engines use flat tappets. Are
they designed with far lower contact stress? I doubt it, as the tips of the
lobes on a direct-acting overhead cam are very sharp. Do they use different
materials? Different lubrication setup? And what about the compression rings?
They have a similar boundary-lubrication "situation" at top center. From the
worry that is going around I take it that all flat-tappet pushrod engines need
the ZDDP additive. That would be a lot of engines worldwide.
Gary Casey
jknezek wrote on Mon, 21 March 2011 12:40
> Joe Mondello addressed this over the weekend at Eastern States, as he did last
>year and I suspect a few other places. He strongly believes that any engine with
>flat tappets needs a zddp additive when using modern oils.
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