Running in a rebuilt engine

[polsta]

Been having a look about on google etc and everything seems to differ

So what's the thoughts on here about how to go about running in a rebuilt engine ?

Mineral oil or semi synthetic ?

Keep the revs right down completely or after a couple of hundred miles give it a little in earlier gears but not in the higher gears as not not to let he rings get too hot ?

Should it be shorter journeys for how many miles and avoid longer journeys or are longer journeys good ? (To clock up more running in miles)

Appriciate any advice

Thanks

[DanThe]

Foot down, job done

[Topblag]

I've got the same issue with the rebuilt H35 lump. The last owner asked the guy who rebuilt it and was advised it needed to be 'run in'. I was thinking of putting it on a rolling road for a day or so to achieve the running in ? Advice welcomed.

[DanThe]

Loads of threads on here giving the proper advice

[GB69]

Do a 5 min burnout smashing it off the limiter constantly. Its then run in perfectly.

[Kos]

Let it run on idle for 10-15 minutes, check for leaks etc then drive it to get it up to temp and then check everything again. There after do as dan said

[Speedtouch]

I think initially you should keep the revs relatively low, but the main thing is to use all the gears to vary the engine speed regularly, and to not labour it in a high gear going up a hill.

Change the oil after about 1,000 miles or so.

[polsta]

Loads of threads on here giving the proper advice

any links ? search function just brings up hundreds of unrelated threads

[polsta]

Let it run on idle for 10-15 minutes, check for leaks etc then drive it to get it up to temp and then check everything again. There after do as dan said

as in- foot down and not worry ? , or taking it easy ? how many miles ?

etc, or in 1st few weeks should it be taken easy no long journeys to get things TOO hot and not keeping it in the top gears for too long periods (what some googled threads said)

as i was thinking about after getting it mot`d and an initial phase of ensuring everything is mechanicly sweet and a few miles done, taking it for a long (500 miles maybe) round trip, taking it easy to give it some good gentle running in miles

[driftwood]

Start it, run it at a fast idle speed for a minute, take the revs up to 3000rpm for a minute or 2 to run in the cam then let it idle whilst you set up fuel mixture and timing. Switch it off and check for leaks. Check tappets and head bolts whilst you're at it. If it's in the car, go for a drive and use full revs in low gears a few times. Don't load the motor too much. Then drive it normally. Change oil and check tappets at 500 and 1000 miles. Make sure to give it a good rev through the gears every once in a while to run in the piston rings. Use the oil that you would usually use.
Or do what SAAB used to do: start the motor and immediately rev to 5000rpm. Hold the revs for 1 minute. Job done.
Basically, don't be a pussy.

[Kos]

Let it run on idle for 10-15 minutes, check for leaks etc then drive it to get it up to temp and then check everything again. There after do as dan said

as in- foot down and not worry ? , or taking it easy ? how many miles ?

etc, or in 1st few weeks should it be taken easy no long journeys to get things TOO hot and not keeping it in the top gears for too long periods (what some googled threads said)

as i was thinking about after getting it mot`d and an initial phase of ensuring everything is mechanicly sweet and a few miles done, taking it for a long (500 miles maybe) round trip, taking it easy to give it some good gentle running in miles

Here you go, it was only 3 or so posts ago

Foot down, job done

[driftwood]

Start it, run it at a fast idle speed for a minute, take the revs up to 3000rpm for a minute or 2 to run in the cam then let it idle whilst you set up fuel mixture and timing but not for too long. Idling for long periods is not a good idea. Switch it off and check for leaks. Check tappets and head bolts whilst you're at it. If it's in the car, go for a drive and use full revs in low gears a few times. Don't load the motor too much. Then drive it normally. Change oil and check tappets at 500 and 1000 miles. Make sure to give it a good rev through the gears every once in a while to run in the piston rings. Use the oil that you would usually use.
Or do what SAAB used to do: start the motor and immediately rev to 5000rpm. Hold the revs for 1 minute. Job done.
Basically, don't be a pussy.

[maxfield]

Get yourself on a long stretch of road. High gear. Foot to the floor up, taking it up the revs and then let the engine overrun. Do this a few times going further with the revs each time. Job done.

[Kos]

Actually ignore all of the advise (you probably will anyway)

Run it in as per the recommendation/instruction of the person who built it

[DanThe]

/\

[hazd31]

run it through 2 full heat cycles at a sensible rpm, then build up from there!

[broadie]

http://www.mototuneusa.com/break_in_secrets.htm
Dont even run it up trailer it to a rolling road.

[jimbom30cab]

yes, i would definately take advice from the chap who built it for you.

He knows how to treat an e30

[polsta]

http://www.mototuneusa.com/break_in_secrets.htm
Dont even run it up trailer it to a rolling road.

whats the thoughts on this ?

interesting reading as it mentions most important bit of sealing the rings is in the 1st 20 miles and to drive it hard ?

[jimbom30cab]

have you got your exhaust sorted now ?

[polsta]

the rebuilder said just take it easy keeping it under 3/4 of the throttle for 1000 miles although when it comes to its 1st drive, hopefully this weekend, wel talk properly about it then

[bss325i]

Has it had a new cam?

Has it had new rings?

If no to the above, drive it normally, no need to bed or run anything in.

Just keep eye out for leaks.

[polsta]

new rings but not a new cam, and new bearings and all the bottom end jazz

ive no expirience of running in a re built engine and as you can appriciate i cant have this go wrong so want to be 100% on what to do so all goes smoothly

yes jim the exhaust situation is sorted, new exhaust is at home, picked up the manifold bots and washers today from snows, all thats needed is fit the exhaust and bleed and check the brake system , then its good to go

[reggid]

use mineral oil or running in oil, get it to temp and drive it like you stole lots of WOT no steady cruising. dont rev it high but drive it hard