[DeTomaso] Why do Camshafts Fail ?

[Asa Jay Laughton]

Ah, the zinc.... ZDDP discussion.  Been there, done that, search the archives.
Your engine builder is correct.

Asa Jay

Quoting STEVEN BLUM <steveblum2 at msn.com>:

>
> I just plled my engine apart and found 2 cam lobs worn out and   
> several lifters worn concave. When discussung the problem with my   
> engin rebuilder he said flat tappet cams  have been going because of  
>  the change in motor oil. Several manufactures have found excessive   
> wear to the cam and lifters because of the lack of zinc in the oil.   
> Everyone should be using either the zinc additive or racing oil with  
>  the zinc in it.
>
>
> If anyone is interest in 4V iron  heads from a 74 Cleveland let me   
> know. I just replace mine with aluminum.
>
>
> Steve
>
>
>
>
>> From: charlesmccall at gmail.com
>> To: dtpantera at gmail.com; detomaso at realbig.com
>> Date: Tue, 24 Nov 2009 20:36:34 +0100
>> Subject: Re: [DeTomaso] Why do Camshafts Fail ?
>>
>> Thanks Don, that answered at least one of my questions - what is the failure
>> mode of a cam (besides violent failure - ie breaking in half)
>>
>> Assuming it survives break-in, I wondered if there is a hardened layer like
>> a human tooth, and that once you wear through this outside layer and reach
>> the softer inner portion of the lobe, the wear is much faster until you wipe
>> the entire lobe? From what I see, the entire lobe is hardened so wear should
>> be even throughout the life of the cam.
>>
>> So what happens during the 100,000 miles of your cam, if you are lucky? Does
>> it gradually wear down a little each year so that your lift is reduced? Does
>> a 50,000 mile cam have a much different profile from a new cam, assuming
>> somewhat aggressive valve springs? I assume that they eventually just wear
>> away
>>
>> 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 Don Thomas
>> Enviado el: martes, 24 de noviembre de 2009 19:15
>> Para: DeTomaso List
>> Asunto: [DeTomaso] Why do Camshafts Fail ?
>>
>> I came across this... and just found this interesting enought to pass
>> along...
>>
>> http://www.summitracing.com/expertadvice/professoroverdrive/?techQuestion=10
>> 4
>>
>> --
>> Best regards,
>> -dt
>> Don Thomas
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