Is It Necessary To Run In A New Engine?

[BOOSTBIG]

I hear so many conflicting opinions about this. I just rebuild my engine with wiseco forged pistons and my mechanic has has the car for a week because he wants to put some k's on the engine. is it really necessary?

[Mohsen]

yes.

[R31Nismoid]

I hear so many conflicting opinions about this. I just rebuild my engine with wiseco forged pistons and my mechanic has has the car for a week because he wants to put some k's on the engine. is it really necessary?

Not at all.

Bed the rings on the dyno, tune it up.

All my motors have been done this was, as have countless others. If the motor is built right from the start you shouldn't have issues.

[BOOSTBIG]

Ok thats interesting. cheers guys.

[wedge_r34gtr]

Not at all.

Bed the rings on the dyno, tune it up.

All my motors have been done this was, as have countless others. If the motor is built right from the start you shouldn't have issues.

Had this discussion with Paul earlier today about my motor - thats his prefered method too. He just said the thing not to do is don't let the mottor idle to bed the rings in

[Carbon 34]

Yes it is

And the oil is critical ( type and prelube on cams etc) i would never flog a brand new engine build unless your wallet is thick and racing required it !!

yes racing a quick run in to seat rings and bearings , check for leaks etc , heat cycle it a few times before a caning it

But have built many engines and popped them into race cars after 5 min of checking for leaks off to the races without drama and it lasted most of the season before melting a forged piston ( fuel related failure )

[Mohsen]

Not at all.

Bed the rings on the dyno, tune it up.

All my motors have been done this was, as have countless others. If the motor is built right from the start you shouldn't have issues.

i was always told you had to bed them in for a couple thousand kays

[zebra]

20mins at 2-3000rpm is all it takes

then give it full load

[babyskyline]

i was always told you had to bed them in for a couple thousand kays

I was always told the same thing. It's interesting to hear there are other methods.

[T4NK]

My 34 GTR is almost done now and i have been told by my mechanic he wants me to drive it for about 1000km then bring it back to him to make sure its all tourqued up and that sort of thing before i give it some.

[m.j.h]

http://www.mototuneusa.com/break_in_secrets.htm

Most important thing is to bed in the rings and the rest takes care of itself basically