What makes breaking in a newly built toda or whatever motor different then taking a car off the dealership showfloor??? Because I know you break in a newly built motor for 1000 miles to have the rings sit, but what about when it's a totally new car? I know I drove mine pretty hard almost right after I got it...

 

Adjust the valves after 1k due to higher lift cams... thats about all I can think of.

Craig - Who can't wait to install his b's

 

no, I meant why do I have to break in my Spec C motor etc... for 1k miles and I didn't have to with the car when I bought it????? u know what I'm saying?

 

You did not break in your motor when you bought it ?

Craig - Who did not hit vtec for 1k miles on his new motor

 

**** no, I revved the **** out of it as soon as I figured out stick real good....so after the 1st 100 miles I drove it like I stole it


[Modified by Pinhead, 1:02 AM 6/7/2002]

 

um....yeah, probably needed to break it in a little more than that

 

Breaking in a motor has many different options... Some people say baby it for the first 1k (ie don't go over 5k rpm, don't keep it at one rpm for extended amounts of time, etc...) while others (many the bike guys) say break it in like you are going to drive it. Not realy sure which is the right way.

Craig - Who drove it like a baby for 1k, then hit the revlimiter every day since

 

I mean what could actually happen if you only break in a motor for 500-750 miles rather than 1000 miles or whatever and then tune????

 

Bearing surfaces like to be broken in easy... Cams like to be broken in hard..
Rings like to be broken in hard as well.. So...

Build the motor with the stock cams...run it easy for at least 500 miles... strip it down to change the rings again and re-hone the bores.. and put in the big cams
and fire it up and break the cams in then give her ****...

The motor is now properly broken in...

 

Exactly right......

 

Pinhead, 500-600 miles is PLENTY. I have told you before, and I will tell you again.
If you don't take my word for it, there are countless other "reliable" sources who have built many Honda motors.
Steve Sakai, Tom at Portflow, Erick's Racing, etc.

Trust me. If your rings aren't seated by 500-600 miles, chances are they won't be seating anytime soon.

 

yes, good point Mike K but topspeed told me AT LEAST 1000 mile before tuning

 

Ok, then go for 1000 miles if it makes you happy.

I dyno'd my B20 at 600 miles, and it was broken in well before then. You can tell when a motor is ready to dyno.

 

see ya tomorrow morning Mike