RickyLee53

I'm just about to build me new engine, and i'm not sure how to run it in.

There are lot's of different method's, but i'm not sure which to employ. I'm tempted on a tick over for 15minutes drop the oil for some fresh mineral and go out and nail it.

The other is, drive down the motorway for 100 miles then drive home, doing some light boost 5k rev's lot of de-accel.

What did you do to break your engine in? And for how long?

Chip

iTrader: (3)

I use varied rpm up to about 60% of max revs, and upto about 50% throttle (or just into a couple of psi boost on a turbo) for around 500 miles, then I drive it at no more than 80% revs and 80% throttle for another 500 miles

Thats for a road motor that I expect to last 50K miles or more, its different if its for a race application.

RickyLee53

I was hoping for a reply from you, as i remember reading your Nova thread, how's it going by the way?

Sounds like a fairly old fashioned way you used and pretty much my second method.

However, how likely am i to do 50k miles in the car, (not very). I'm tempted on a race style.

I'm sure you've seen this, not sure how much truth is in it.
http://www.mototuneusa.com/break_in_secrets.htm

Dave_YD

when i assemble my engine i plan to break it in the hard way. I plan to run it for about 50 miles check everything is fine etc. then go and get it mapped.

Chip

iTrader: (3)

The key sentance in that article is here:
I still use old fashioned honing techniques, so NONE of what he has written applies to me, same goes for most DIY builds, and for that matter most engine shops.

so people read something like that on the net, think it applies to them, and fuck up their engine.

Chip

iTrader: (3)

PS

One thing I totally agree with him on is the very early on oil change, I give a max of 50 miles to the oil before changing it.

bigpower

Im doing first 300 miles about 3/3500 revs max, but at the same time not letting it go to low on the revs, then change oil, 300 miles upto 4/4500 revs, then changing oil and taking the revs up further. Boost is knocked down to about std settings.

1000 miles change oil again, then im handing the car to MSD

Chip

iTrader: (3)

Sounds fine except I would pull that first lot of oil a lot sooner.

Gordon1

so many people do it so many ways i have tryed many ways and to be fair there not a lot in it as long as you change the oil
i ran an escort in on the dyno for 30 miles at 3000rpm foot to floor then change oil the 100miles on the road and thats it and she runs mint

its the same old thing that so many people will do it there way

cressy

iTrader: (1)

i`m just running my new engine in planning on doing 500 mile change oil then it`s off to be mapped

RickyLee53

Yes, that's something i use. Also.

I've had a lot of experience with 2 stroke engines, there nature means you pull them apart very often. So you can see which running in technique was the best. On the 2 stroke's it's certainly the hard way.
But still, what's hard on a 2 stroke? 9-10k RPM's is still around the 75% of Max rpm's mark. I was 1 of the few that run less oil during the break in period rather than the usual it's running in add some oil.

Any 4 stroke's i've run in, i didn't strip them down again afterward's so can only gone on oil consumption crank case pressure's etc for which is the best method. but then there are far 2 many variables to know if it's accurate.

I was hoping for a tuner to reply but i'm fairly sure they won't give up there secrets.

The engine in question is used a lot in the US and they all seem to break in the hard way. However a lot of them have found this work's better for less blow by.
In irony i don't trust there method's as the 1's that have pulled it to bit's, because well, they've already had to pull it to bit's again for probably a build error.

Chip

iTrader: (3)

LMAO @ the logic about why they have it in bits again so soon