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hcoles hcoles is offline
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Join Date: Mar 2005
Location: Saratoga CA
Posts: 3,295
The three things going on per what I've read:
1. don't over heat the rings during the break in process, this is mentioned above.
2. breaking in the engine easy and slow can allow glaze to form, then the rings may take much longer to seal and in the mean time all the leakage does a number of bad things
3. rings are pushed against the cylinder wall because of the combustion pressure, that's why you run close to or at WOT and back down.

So I guess it is sort of balancing act, don't over heat, don't let glaze form and keep pushing the rings hard against the cylinder wall.

There are quite a few websites that talk about this controversial subject.

As Jack mentioned rings should seal very quick if all the proper machine steps are done. I think the factory has the resources to do the processes properly and keep things calibrated and maintained. I have very little confidence that any 3rd party aftermarket company can provide this as a reliable service. I could be wrong. I think this is the primary reason to follow some sort of break in "process".
-h
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1989 3.2 coupe, DIY top end at 77k, now 112k
Old 07-29-2005, 08:45 PM
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