Re: WAIT!!! Did you get a new cam grind!? - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: WAIT!!! Did you get a new cam grind!?
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Posted by kansas (more from kansas) on Thu, 30 May 2002 20:23:51 Share Post by Email
In Reply to: Re: WAIT!!! Did you get a new cam grind!?, Brendan, Wed, 29 May 2002 21:50:34
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BUT, If you got a new cam grind be sure to reve the engine immediately after first startup, and vary the RPM between 2,500 and 4,000 for the first 20 minutes of running.

Uhhh, I am not sure of any good basis for this. 4000 rpm is near top end for unmodified V4s, varying engine speed within reason is fine but I would be inclined to stay Idle-to-2500.

>Otherwise... your cam and followers will start swapping metal, which is not a good thing.

Agreed.

>Also, I used non-detergent 30w oil for my startup, but I'm not sure if it make a big difference, it was just suggested by the machine shop.

I think your machine shop is severely (like 20-30 years) out of date. This is old wisdom that does not apply with modern machining technology and lubrication capability. I would run fast to a younger or more up-to-date machine shop. Put in some 10-30 detergent oil right now.

Also on the cam lobes and bearing surfaces as well as the followers, I was advised to use high-temp molybdenum grease rather than oil or engine assembly lube.

Yes. Don't be stingy.

GOOD LUCK! Don't worry about half of this if you didn't get a new cam grind.

Au contraire, do all the good lubrication things with new or old cam.



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