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For engine break-in you want low rpm under heavy load to force the rings against the cylinder walls so they may wear into the proper shape and seal. This can be acomplished in 50-100 miles.
We did this to the BuzzBomb and since then it shows virutally no oil condensate (from blow-by) in the intake tract.
Washing down the cylinder walls with fuel will only promote break-in because of less lubrication. Break-in is simply wearing the rings to fit the cylinders. Of course, once the rings are seated, it is best to prevent further wear.

Sweeney wrote:For engine break-in you want low rpm under heavy load to force the rings against the cylinder walls so they may wear into the proper shape and seal. This can be acomplished in 50-100 miles.
We did this to the BuzzBomb and since then it shows virutally no oil condensate (from blow-by) in the intake tract.
Washing down the cylinder walls with fuel will only promote break-in because of less lubrication. Break-in is simply wearing the rings to fit the cylinders. Of course, once the rings are seated, it is best to prevent further wear.

I thought the new method consisted of running it haaard for about 50 miles, changing the oil, running it hard for another 1000 -change the oil - then you're good to go.

Tjn182 wrote:I thought the new method consisted of running it haaard for about 50 miles, changing the oil, running it hard for another 1000 -change the oil - then you're good to go.

If the rings are not making full contact with the cylinders (the reason for breaking them in), high rpm under very heavy load would unevenly heat them and could strain them because the lack of contact reduces the ability of the cylinder wall to heat sink the rings. This strain would then result in uneven pressure against the cylinder walls causing more wear problems down the road. This then results in a reversal of the earths magnetic field and the extinction of the three toed sloth... on a Tuesday... during a thunder storm...

just my thoughts....

that said.. there is no 100% correct way to break in an engine...

it's really all up to the advice of a tuner/engine builder...

well i went back to the tuner on wednesday. we spent most of the day installing the msbc-1 boost controller and let me tell you, that thing works like a dream!!!!!!! holds boost perfectly, allows you to program boost and ramp for each gear and a lauch control setup. what an awesome toy! as for power, we turned down the boost a bitto 15 psi and di a touch more tuning but my tuner was a little weary about me running 20 psi all the time. it still made 350 rwhp and 410tq and it is smoother than it EVER has been (including NA). so i am going to go back next month to setup the launch control and do a 24-25 psi tune on 100 octane. i'll let todd comment on the car as well as a bunch of us are meeting up in toronto tommorrow.

Is there a meet in Toronto tomorrow?

small meet (40-50 cars) at parkline bmw in oakville. drive down and meet the crew lee!

well it was a fun weekend and after looking over todd's tuning maps this weekend we concluded that i still have some tuning to do as there is a little too much fuel in my tune and def way too conservative on timing. i might try to play around with it a bit but i am heading back to the tuner within 3-4 weeks to hook up the launch control so we might just do some tuning then. drag strip is next in my sights!!!