Yes it is Rob. The lifters are not nitrided, only the cam lobes.
On Sun, Jan 29, 2012 at 4:34 PM, Rob Mueller wrote:
> Jim,
>
> Thanks for your excellent explanation of why it is necessary to run the
> engine at 2000 rpm for 20 minutes.
>
> Unfortunately I was not clear when I noted "I don't understand what this
> means."
>
> I meant I did not understand what "Our shop uses the smiler machine to run
> it to check the oil flow and
> pressure" meant.
>
> Simply put what's a "smiler machine?"
>
> Normally I can translate Kanomateze but that one's got me stumped! ;-)
>
> BTW subsequent to all the problems that came up with the drop in ZDDP Comp
> Cams will Nitride a flat tappet cam to help prevent low
> ZDDP problems, I haven't done my homework and checked to see if it is
> still necessary to do the "break in." Do you know off the top
> of your head if it is?
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: gmclist-bounces [mailto:
> gmclist-bounces] On Behalf Of James Hupy
> Sent: Monday, 30 January 2012 6:30 AM
> To: gmclist
> Subject: Re: [GMCnet] S & J Engines in Spokane, WA
>
> Rob, on flat tappet camshaft equipped engines, the materials that the cam
> lobes and the lifter bases are manufactured from are not sufficiently
> smooth to allow a happy marriage between them. The engineers try to select
> the most compatible materials to manufacture them from, but they still need
> to wear into each other. That is what a 2000 rpm 20 minute non stop engine
> run will do. After that time, the oil and filter should be changed and
> replaced with new oil and filter to get rid of all the material that has
> worn away from those surfaces. I won't go into the zddp/truth vs myth
> discussion, but when I do an engine, I always test run it on a stand. I
> don't like oil leaks on a fresh engine after they are installed. It ruins
> my attitude, which is none to great anyway most of the time. I also use a
> product like GM EOS (engine oil supplement) which used to be furnished with
> all GM camshaft/lifter packages when the factory was still supporting the
> recall on their small block cams. (silent recall, they only fixed the ones
> that the customer came back and complained about.) This product is always
> added by me in the initial crankcase fill up. There are other similar
> products on the market, most with MOS as the principal ingredient.
> Molybedunum Disulphide or some derivitive of it. Comes under the trade name
> of MolySlip, MolyKote, and several others. Good stuff for cam and lifter
> break in. A number of engine assembly lubes also contain the stuff.
> Jim Hupy
> Salem, OR
> 78 GMC Royale 403
>
>
>
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--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ