Quote:
Originally Posted by Bizaro
When I got my car I drove it 200 miles home at constant 3k-4k RPM on the highway while doing hard pulls occasionally. Broke it in the right way  |
That's not the proper way to break one in anyway.
Constant high rpm on a new engine is bad, you can overheat bearings and other mating surfaces that haven't worn into each other yet.
The hard pull in a higher gear is desirable though, and you want to let the engine do braking to clean the rings off under a high vacuum situation.
So basically accelerate let the rpm come up and slow down using the engine braking. You don't want to cruise at a constant speed and constant rpm though. You'd be better off switching between 5th and 6th gear on the cruise.
I'm not really convinced all this makes a huge difference these days anyway though, the engines have already been run from the factory and at the dealer and such anyway, so it's likely already too late to do any good to the rings.
That said, if they truly do test a motor or two and break them in the proper way and then toss them in a production car I could see that motor possibly making a bit more HP, I seriously doubt it would be dramatic though.