just wondering what is the best way to brake in a new engine? Do i just drive slow for a while and not rev it too high?..... i really have no idea....

cheers

You can still drive a new engine at all speed limits, including 110. you should however avoid high revving situations such as sudden overtaking or towing.

Warm the engine up for a couple of minutes before driving in the morning.

Use a low viscosity oil, the tolerances in a new/rebuilt engine will be a lot tighter so a lower viscosity oil is usually recomended, speak to the people who built it.

Change the oil after 1500-2000k's

Dont you use running in oil (SAE30w)?

I ran in a new engine using Penrite running in oil for 500k's then normal oil. Load the engine up every now and then, this loads the rings up and pushes them against the bore, don't sit on a steady speed for hours at a a time,, don't over-rev or labour the engine (labouring flattens the bearings), don't tow for 1000 k's. Other than that, drive normaly

I was under the impression that you use a mineral-based oil for run ins. No high revving (over 3k). No need to let her warm up..

Warm it up then thrash the f**k out of it. Make sure you don't 'cruise' or let it idle for too long.

yeah good one please ignore the last post. do what other people have said normall driving loading up the engine a fair bit is good for the first 2000km or so does help alot. is it a new car or just a rebuit engine

try and drive it all over the rev range but dont go to redline and dont sit on a constant rpm for long
cheers

rebuilt , its performance stage 4 engine

Voxace is right... mostly. For proof read motomans page. Its a long read but well worth it. You might just say the guy is a nut case, but he shows concusive proof to what he says with examples and pictures of engine internals. Running an engine in lightly is no good. You need to drive under heavy load to bed the rings in correctly. The higher combustion pressures push the rings outward so they can ware in and form a tight seal. And the theory about engine bearings having to gradualy ware off high spots etc before you can thrash it is complete s**t. The link has proof.

Just go to the ones that say "break in secrets", and after that read his whole site. I reckon he is a legend. He is certainly not the kind of guy that follows other people just becuase they all do things one way. Just remember that if heaps of people do something that is wrong, and it becomes accepted as the standard IT IS STILL WRONG!


http://mototuneusa.com/thanx.htm

yeah i read it last week , part of the reason i posted this subject.
still not convinced either way.

I have read it, and agree, the run in procedures, that they use now, have been around since the model T, which would have had HUGE clearances, todays technology negates most of this, i wouldnt thrash my new car/motor, but i wouldnt drive it like a old woman either.

Gee thanks.
Go read the site...hehe...

Who is "they"? It seems that the only people who run engines in softly are people like us.....



Motor companies all redline their engines before you get them. So for those that buy a new car and piss f@rt it around for a while. Just remember your engine has already been thrashed hard core at the factory and by the dock workes that take your car of the ship if it is an import lol (trust me, I have seen the dock workers in action).

What do you think race engine builders do for thier engines? The certiainly dont put them in their race car then do 3000 light laps of the race track to bed it in. They put i straight on the dyno and carefully give it a hadcore run it. Its not just a matter of thrashing it, you have to do it right.



I think motoman has shown pretty hard to beat proof for one side of the arugument. I am yet to see any proof that shows how light run ins are good. (that has not been undisputably shown to be wrong by motoman) Did you read all of the parts to the story? I am a very sceptical person and it takes a lot to convice me, but he holds a pretty tight argument on the matter. And his work on race winning bike engines seems to back it up.

Last edited by DennisRB30 on Mon Mar 07, 2005 9:02 pm, edited 2 times in total.

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