[DeTomaso] How much ZDDP?

[Asa Jay Laughton]

The hydraulic flat tappet I had in the Mach I, Ford Racing cam circa  
1990, seemed to break-in just fine with the Crane break-in cam lube.   
The car ran great for many years.  But, sometime later I decided to  
stop paying a premium for Amsoil and switched to off-the-shelf brand  
SL oil.... I wiped a cam lobe shortly after.

Was it the oils lack of Zinc and Phosphorus?  Knowing what I do now...  
that's my belief.

Now I run a roller and use Amsoil again.
Asa Jay

Quoting Thomas Tornblom <thomas at Hax.SE>:

> 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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-- 
Asa Jay Laughton - sent from somewhere other than home
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