fresh motor break in

[Tyler]

im rebuliding my ka with arias 8.8to1 pistons, ams sportsman rods, calico bearings, all arp fasteners and felpro gaskets. then im pairing that motor with the jgs turbo kit and im hoping to run around 20 psi. i was wondering though, what is the proper way to break in a completely new motor like this? i have lots of money in this ka and i dont wanna mess it up by breaking it in wrong

[terbo]

Put in dino oil first and set the boost low (5-10 psi). Start it up and drive it gently until it is warm. Once warmed up do a third gear pull to redline and let the engine slow the car down. Repeat two or three more times. This should be done within the first 25-30 miles of initial startup. Change the oil immediately as soon as you get back. Drive it normally (yes you can hammer every once in a while, just make sure the car is up to operating temps) for a hundred or two hundred miles and change the oil. Change the oil again at 1500 miles, I put synthetic in mine at this point. Turn the boost up and enjoy. This is the way I broke in my DSM after a rebuild and is the way MotoMan recommends. My DSM was pulling strong at around 400hp when I sold it with ~5000 miles on the engine and had no leaks and perfect compression numbers across all cylinders. http://www.mototuneusa.com/break_in_secrets.htm

[DMan II-40]

I dont think you should break it in with the turbo. I seen people break it in N/A then put on the turbo after. Seems like a better idea to me.

[Tyler]

i know it seems like a better idea, and i thought about that, but thats alot of ****ing around too, cause the motor is all the way out of the car and i was just going to bolt everything on while it was on the stand

[nissanfanatic]

I broke my built engine in on 12psi.

[WDRacing]

There is only one chance to break in the rings, that's basically the first 30-45 minutes. Drive it hard, don't lug the motor and do a lot of motor braking. It doesn't really have to see red line, but it should definitely be "revved up". Change the oil and repeat.

If the clutch is new, no launching and keep the boost down.

After the initial 100 miles or so, just drive her like normal while trying to avoid lugging the motor. After 500 the clutch and motor should be all set.

WD

[neverlift]

I broke this motor in without boost, with some good ole engine braking, its funny because after like 40 miles the comp was at 15, I went drifting a few times shortly after and the comp shot up tp 167~

I'll probably do it again today and check everything is still good, running 5.5 psi with under 500 miles, saw about an hour of straight beating the tar out of it in 2nd/3rd sliding lastnight

[Tyler]

There is only one chance to break in the rings, that's basically the first 30-45 minutes. Drive it hard, don't lug the motor and do a lot of motor braking. It doesn't really have to see red line, but it should definitely be "revved up". Change the oil and repeat.

If the clutch is new, no launching and keep the boost down.

After the initial 100 miles or so, just drive her like normal while trying to avoid lugging the motor. After 500 the clutch and motor should be all set.

WD

whats a good boost level for a fresh motor/clutch/flywheel for the first 500?

[480sx]

Damn man your in a bad spot. You got two issues going on. An engine breakin, and a clutch breakin. Its really better to do them separately.

The best thing you can do is worry about your engine breakin first, because that should last longer(and costs alot more) than the clutch. So put a beating on the motor a bit, your clutch will 'break in' really quick.. Im not sure if its even worth it to worry about breaking in the clutch after you break in the motor. With high RPMs the clutch is going to break in really fast.. Which isnt what you want.. But its w.e, engines more important than the clutch.

[lrb_2000]

Yeah.. wow, I didn't even think about that. I'm glad my clutch is already broken in..

I would just keep the boost as low as possible for about 300 miles maybe, but don't break the engine in easy.. You won't really destroy your clutch if it's a nice one.. some cheap clutch might were out faster, but it's nothing to worry about.. unless it's actually slipping on low boost.

[S13FX]

whats a good boost level for a fresh motor/clutch/flywheel for the first 500?

Depending on what type of turbo you have. But on an average its about 8 psi. But since your using lower comp pistons around 10 should be good. Also are the pistons stock bore or did you have the engine bored a bit?.

And like WD said the first 40 mins of your motor break in are the most important. Especially for rings sealing to achieve proper compression ratios later on.

[480sx]

IMO you want to boost as little as possible on fresh rings. Your rings arnt fully seated, and this is going to let a lot more blowby gases escape your rings. Thats going to add as a multiplier effect with boost, and will pollute your oil pretty fast.

[Tyler]

yeah we bored it .020 over. so what im getting is run it hard for the first 45 min or so at about 8 psi, and not really worry about the clutch?