I've done a couple searches and found a couple good break in articles..and still not sure which is the best way..but im pretty sure just running the motor normally and change the oil a lil early for the first 3000 miles but thats not the question im really asking lol anyways

I've read a couple where they say you need a tune right away.. but i kno thats with a built motor non oem spec

but im getting my motor rebuilt to stock oem specs, do i have to do any tuning?

i know it sounds like a kind of dumb question, but i dont want all the money go down the drain for not asking..

lol

thanks
Matt

 

No, you do not need any "tuning" if the motor is going to be stock. Do an oil change after 800-1000 miles to flush the break in crap out. Follow the same break in procedure as the manual says. I believe its staying under 5k rpms and 75mph for the first 800 or so miles. No vtec!

 

I concur with the no tuning comment, if it is stock there is nothing to really tune. I don't know where you are in the re-building phase, but have them use a break-in additive on the cams and rods when the engine is assembled to protect you on start up. I like to prime the oil pump before firing it up by turning the engine over without the coils one or two revolutions.

Break-in within the first 60 miles is key to seat the rings, by 100 miles the majority of the break-in is done. Believe it or not, Dodge/Chrysler has it spot on for break-in driving techniques. They recommend running WOT in higher gears from a cruise situation. Get the car in a higher gear such as 3rd or 4th gear, from a cruise situation without the rpms being too low (3000+ so you don't lug the engine) run WOT for about 8-10 seconds on a clear empty stretch of road. Try to do this a few times each time you drive the car, starting from the first drive. You don't have to run the rpms very high (under 5000) but the WOT driving will put best pressure on the rings and seat them well. I don't do it in lower gears as the rpms rise too fast . Do this from mile number one to 100 miles, and even up to 600 miles if you can. Ford also recommends a similar procedure, I think it's the best way to do it. Running too light throttle doesn't put enough pressure on the rings and they may not seat as well. Every engine I've done this on have been strong engines and never had oil consumption issues. I know some engine builders who follow the same procedure too.

 

alright cool thanks guys!

if anyone has any other input i love to hear it =D

 

Similar to what JFUSION posted

I did a lot of research when I rebuilt my gsr. I followed this method and it worked great.

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

Building a b20v right now and will use the same procedure when its done!

 

awesome.. thanks a lot guys i appreciate it!

 

how i break in my engines-

initial start(after prime ofcourse)
idle till warm
check AFR (slight tune if possible)
drain oil, change filter

dyno, high rpms with engine braking.

change oil, check for large metal shavings. Metal dust is normal.

drive it normally.(vtec, high rpm, high load, high boost)

change oil after 1000 miles.

then to the regular 3k mile interval.