Originally Posted by Jason Drew
Originally Posted by Michael Lee
Thanks big guy wink


Now I've got a question regarding the break in procedure for a new engine.

Let's say your car has a new clutch along with the new rebuilt engine.

You're supposed to drive hard and let the revs climb then drop over and over, but how the heck are you supposed to do that when you have a "new" clutch that you need to keep under 4k rpms while you're breaking that sucker in???



Driving it hard enough to set the rings and beating it excessively for the clutch are 2 different things.

That first 20 miles is the crucial point in setting the rings, going on and off boost steadily is not going to hurt a new clutch, as long as you're not slipping the clutch and launching it, I wouldn't worry about it.

Drive it hard, it's called a break in for a reason, the only thing seating the rings is cylinder pressure so don't baby it.


I was told to keep it under 4k rpms by Tim Zimmer and no boost for the new SS/TZ combo.

So for clutch break-in it should be okay going into boost and higher rpms past 4k?

Sorry for the thread jack, but am curious, because I don't recall reading about engine break-in with a new clutch as well.

1997 Eclipse GST/X
Eat in small amounts. Otherwise be prepared to paint toilet bowls~ Mike Eng