Opinions on this not-so-typical engine break-in tactic?....

[gixer02]

http://www.mototuneusa.com/break_in_secrets.htm It's for motocycles but applies to all motors. I just read this whole thing I think that I agree with it what do you guys think?

Pat

[Zendalar]

There may be some truth in those words. And after my engine rebuild, i have not actually been "careful" with the car. I have put her once or twice near 6000RPMS, but mostly i accelerate and decelerate pretty normally. Although I don't keep the revs up, usually i cruise at 3000 or a tad higher. Mixed driving i think.

[jluetjen]

The other thing that needs to be considered in the plating on the rings. If my memory is correct, rings with a chrome-moly finish on the outside bed in quicker then stock rings.

Does this sound right?

[Early_S_Man]

Actually, that procedure doesn't differ that much from the factory method of a one-hour dyno run-in after warm-up and setting the timing at 6000 rpm ... from the '60s that I posted back a few months in response to Leland's question about break-in. Actually, the dyno run-in is a much tougher load than 20 or 30 minutes above idle no-load procedure that most people use to initially break-in their rings!

Chrysler's legendary 'father of the 426 HEMI' Tom Hoover once said in an interview that the 'proper' break-in for a Hemi engine was half-a-dozen full-throttle runs down a drag strip! So, the web page procedure isn't exactly a new concept!

Given the factory procedure ... most people's inordinate fear of setting the timing at 6000 rpm (and refusal to do so in most cases) is a bit irrational to me! The factory does it ... the engines will not suffer any damage, assuming the person doing the timing can read a tach, and any 911 engine can certainly handle the no-load rpms for a few seconds!