[DeTomaso] How much ZDDP?

[Thomas Tornblom]

My old motor ate a lobe and lifter in Italy 2004, hydraulic flat  
tappet, Mobil 1, no extra additives. I'm with you Charlie.

Thomas, runs hyd roller now.



24 feb 2011 kl. 20.04 skrev Charles McCall <charlesmccall at gmail.com>:

> 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
> anti-scuffing additives.
>
> Mike thinks that this only applies to solid lifter camshafts.
>
> I think people are confusing solid lifter/hydraulic lifter with  
> mechanical
> tappet/roller tappet.
>
> 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?
>
> Charles McCall
> 1985 DeTomaso Pantera GT5-S #9375
> "Raising Pantera Awareness Across Europe"
> http://www.poca.com/index.php/gallery/?g2_itemId=2323
>
> -----Mensaje original-----
> 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.
>
> Paul
> #9270
>
> 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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