Hi Folks
Enquiring minds need to know, how does this affect our Triumphs as I am
guessing that most if not all of our cars fall in to the solid lifter
bracket, are they at risk of cam / follower failure due to the reduction /
absence of ZDDP in the oil, if not what is the difference between these
engines and diesels (except the comp ratio of course and the fact that they
burn oil) are the valve springs much more powerful and exert such higher
forces on the cams / followers?
Graham.
----- Original Message -----
From: <McGaheyRx@aol.com>
Subject: Re: [TR] No LBC content: Synthetic oil & diesel engines
> ZDDP is the Zinc compd that's been phased out of gasoline engine motor
> oils
> over the last 10 years - during this time engine builders and cam makers
> have
> found, the hard way, that the absence of ZDDP causes early cam failure in
> solid lifter engines - engines with hydraulic lifters and roller cams
> (which I'm
> guessing includes all modern gasoline engines) are not similarly affected
> by
> the absence of ZDDP - apparently the ant-scuff properties of ZDDP are
> vital
> to the life of the cam in solid lifter engines.
> What Cummins means is don't use oils missing ZDDP in solid lifter
> engines -
> that would include ALL current gasoline engine oils - synthetic or not -
> except some racing and marine synthetics with additive packages including
> ZDDP
> Diesel engine oils (like Shell Rotella T) still have ZDDP
>
> Cheers
> Jack Mc
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