[DeTomaso] How much ZDDP?
charlesmccall at gmail.com
Thu Feb 24 14:04:16 EST 2011
Mike Drew and I were having this identical debate off-line.
I agree with Paul, and believe that any cam that has the lifters rubbing
against the camshaft (mechanical tappet) can suffer from the lack of
Mike thinks that this only applies to solid lifter camshafts.
I think people are confusing solid lifter/hydraulic lifter with mechanical
So right now the debate is 2-2 - Mike and Patrick think that this only
affects solid lifter cam engines. Paul and I think that this affects
mechanical tappet engines, both hydraulic and solid.
I have solid lifters, so there's no doubt that I will look after my zddp.
Mike has a roller lifter, so there's no doubt that he does NOT neeed to do
so. Anyone else have any data?
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness Across Europe"
De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
nombre de Paul - Home
Enviado el: jueves, 24 de febrero de 2011 18:01
Para: detomaso at realbig.com
Asunto: Re: [DeTomaso] How much ZDDP?
This is wrong. It applies to all flat cam shafts, solid or hydraulic.
It doesn't apply to roller cam shafts, solid or hydraulic.
The ZDDP helps with the rubbing of the flat lifters against the cam
lobe. The roller cam shaft doesn't have the same problem because the
rollers roll over the cam lobe.
On 2/24/2011 10:52 AM, Lee, Patrick Q wrote:
> If you have hydraulic lifters, I wouldn't sweat it, Rob.
> The ZDDP debate only applies to solid flat tappet cam shafts.
> There is probably no harm done by adding the ZDDP but maybe like the old
> STP oil treatment, it does no good either. I knew guys that used to
> swear by STP and Slick 50 etc.
> Go figure.
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