Hey all i've searched all over for a thread that has some recommended tips on running in... can't seem to find it? 
 
Anyway, I've just had my mk2 with a rebuilt 2.0L in it dyno tuned and am ready to run in, could some one link me to the correct advice or provide their own run in procedure, shes a very tight engine!
 
Thanks in advance!
 
 

Hi Tim,
 
I have always been told  the best way to run an engine in is mixxed driving at mixed loads and rev ranges, sitting on a freeway at light throttle isnt actually very good, my running in advice would be just drive normally, but avoid really big throttle openings or really high revs.
 
Although, given it has been dyno'd then you have probably already "run in" the engine to some degree but the above can't hurt.
 
Another tip was to replace the oil after a few hundred k's or so to remove all the swarf that come loose in the engine.
 
The is not a definitive guide just what I have been recomended to do.
 
Cheers,
 
Matt

Hey matt, 
 
thanks for the advice! Yep the guys at the dyno tune told me they didn't take it past 3grand because she was so tight, and he said that I should probably keep it under 3grand for about two thousand km's or so with no full throttle....
 
Its so frustrating because everyone has different opinions, some people spend like an hour just taking it to different rev ranges and letting it engine break and then drive it conservatively for about one thousand kms...
 
I'm a bit stumped to be honest (not that you're advice isn't appreciated!)

2 thousand km's seem like a lot but then they know more than me for sure.
 
Good luck, I'm sure someone with more knowledge than me will be along shortly.
 
Matt

Yeah cheers matt, will let you know!

I head for the hills when running in an engine.
If you have a new cam, they must be run in at over 3ooo rpm first up.
Build up the maxium rpm the further you go. 2-300km oil change and it should be ready to rev.
I use chrome molly piston rings, so I can rev it straight away.

Break in, that's done in the first 50-100 km. The rings and cam bed in instantly. Bearings never touch unless they're stuffed or incorrect.

I normally start it up, check everything is ok over 10mins, oil, cooling, timing, fuel. Then take it for a good 30 min strap then drop the oil, all done. I don't free rev the motor but I do go to the redline.

Going "easy" initially for long periods prohibits the rings from seating and the engine will be a smoker.

Also there is no such thing as chrome moly rings. They are either chrome OR moly coated, not both. This is a common misconception. 99% of performance rings that people use in car engines are moly rings. Moly rings bed in almost instantly and have improved sealing and lubricity.

Chrome rings are used normally in dirt track or nasty fuels. A moly coating will hold dirt particles. They require a really rough surface finish due to the chrome not "holding" oil well.

Maybe someone can answer for me - Isn't the point of a dyno  session on a new engine to get all the a/f rations right and to bed the engine at the same time so when it leaves it is good to go.
 
I am sure race engine don't need to drive around for 2 thousand k's or so until they can give it the beans.
 
Cheers,
 
Matt
 

An engine dyno is the best way to bed in a fresh motor. With all the sensors and probes it's easier to catch a catistrophic failure. The water brake can pull the motor down very quickly.

More and more professional engine builders dyno their engines. 30 min and it's done plus they can quantify if it was a good build. V8 supercar engine is all done in under about 2 hours with a full tune!