nassty02

I have a 383 cu 9:1 compression ls6 being finished thursday. It has a D1 blower, 6.0 liter heads, LT's, motron 60lb, ect. The shop is recommending putting on a base tune, driving it extremely easy for the first thousand miles, performing the periodic oil changes, and then bringing it back to the shop for an agressive tune. I am wondering if the motor is supposed to see any certain rpms or throttle during the initial break in, and if so what rpm and % throttle? Also, keep in mind the blower has a 12 lb pulley on it and the motor will not be completely tuned, which would make me think that any high-throttle accelerations would be a bad idea (Seeing boost with no real fuel curve tuned in). Thoughts?

BOONE

iTrader: (4)

With a new motor you are supposed to vary the rpm, but keep it low. Its a load and wash away situation with the metal surfaces and the oil. Its like a final machining process. What I do with a new motor is run it till warm on dino oil then change it, then run it with the same type oil to 500 miles varying the rpm to about no more than 2 or 3000 rpm. Then change the oil again with dino oil and varying the rpm to no more than 3500 or 4000 or so to 1000 miles, the whole time only light throttle. The key is no highway miles. Then tune it and run the dino oil to about 2000 or more miles then change to synthetic. If the part tune is accurate enough you can rev it with part throttle, ( very light, just enough to drive it.) to the rpms here and not hurt it.

nvmy2000ss

iTrader: (17)

I broke mine in without the blower but I would think if you stay out of boost and vary the rpm's you should be ok. I know some people heat cycle the springs then let loose. I wouldnt do it but to each is his own.

Turbo LS1 SS

iTrader: (7)

if the tune is safe....MAKE SURE TO LOAD THE ENGINE....those rings need to seat properly, and u dont have that big a window of time to do it

AVB

iTrader: (9)

I agree.. That first 20 miles will mean leaving it in or pulling it out again. Check this out and you decide.. Breakin Secrets

Good Luck

Ryan K

iTrader: (11)

Break in procedure for new engines:

1.build motor
2. put in car
3. put car on dyno
4. Flog the hell out of it...

The only thing you are "breaking in" on a car with a roller cam is the ring, and they get broken in under load... WOT passes to seat the rings is the best way.

KHShapiro

iTrader: (10)

that is what i have been told as well

ddnspider

iTrader: (26)

way ive understood it...break it in hard and soon...itll make more power but for not as long...break it in slow and easy....it wont make as much power but will usually last longer so long as you make sure to seat the rings.

WAHUSKER

iTrader: (4)

I broke mine in with dino oil, and no blower. But like Ryan said, you don't need to baby it.

nassty02

Yea, from what I've gathered, I think I am going to just drive it like I typically would, nothing crazy, no WOT, but enough load to break everything in properly. And, of course, make sure I change the oil as periodically as is recommended for the early break-in stages. Thank you all for your help and advice, I would definitley be lost without you guys' guidance.