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Posted by Dave Speed on Saturday, January 17, 2009 at 10:19:41 :
In Reply to: engine break-in... posted by chrisnj on Friday, January 16, 2009 at 23:24:51 :
Obviously, the pre-lube idea is a good idea.
I'm told the biggest lubrication challenge in a rebuilt older engine is the camshaft/flat tappet interface. This is an issue of concern with modern motor oils that have little Ca, Zn or P additives. Google for an additive called ZDDP and believe half of what they tell you. Some guys run Rotella, some use the Royal Purple break-in oil, some add a pint of red (4 cyl)STP.
I've been advised by a pro engine rebuilder to run the engine between 1500 and 2500 rpm for 20 minutes to get the cam settled - before actually driving the vehicle.
This has worked for me.
Dave