Quote:
Originally posted by Xterradon:
What about supercharged engines? The system isn't always under vacuum, but positive pressure. How does oil get up to the rings and such then? I think they want to you to vary speed so that you don't wear grooves in whatever parts breaking in. They'll wear-in more evenly? What do you think?
There is always vacuum, even in supercharged engines. Do you think the air charge is pushing the piston down on the intake stroke?

I'm sure there are wear issues, that's the whole point of the break-in. If the engine spends all its time under a consistent load, only certain areas would receive the majority of the wear.

Brent
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