Running In Procedure

[zeolite 0]

Well I have done a search and read the posts and I think I have a plan.

 

The engine has new rings/honed liners and new big end bearings. Everything else is as it came out (apart from head bolts). The car is NOT road legal and never will be again. It is for short grasstrack races and will do maybe 50 miles a year. So I can't run it in over 100s of miles.

 

I am going to get it running and warm it up. Check for leaks then stick it on the trailer and head off to Crail. A few quid to Mr Robertson should get me some airfield time where I will give it the gun.

 

Rev it to 5k then let off to 2k, repeat for 15 mins.

 

pull in check fluid levels.

 

Rev it to 5k then let off to 2k, repeat for 15 mins.

 

pull in check fluid levels.

 

Rev it to 7k then let off to 2k, repeat for 15 mins.

 

Should that do it?

 

Any probs with this?

[Mikey G 3]

If its built properly it will need minimal running in.

 

I would give it half hour trundling around at 3k letting it fully warm up, then let it cool right down before checking it over. Then do the same again after it has cooled while increasing revs every outing onto the track.

 

The key is to heat cycle all the new components, just running it for a few hours will not do this, it needs to cool down properly before another run.

[DamirGTI 342]

Don't know really as this bothers me too , i will soon finish my overhaul job and still thinking about options for running in

 

Which oil are you planed to use for running in procedure ? semi synthetic or mineral oil ?

 

Damir

[zeolite 0]

If its built properly it will need minimal running in.

 

I would give it half hour trundling around at 3k letting it fully warm up, then let it cool right down before checking it over. Then do the same again after it has cooled while increasing revs every outing onto the track.

 

The key is to heat cycle all the new components, just running it for a few hours will not do this, it needs to cool down properly before another run.

 

The only new components are the rings and the big end bearings. How does a heat cycle affect them?

 

 

Mineral oil will be used for running in.

[brianthemagical 1]

The only new components are the rings and the big end bearings. How does a heat cycle affect them?

 

the PR will be taking the same as the piston crown so that will get very hot. even the bonnet will get a bit hotter when the car is run so the big ends will get hot.

heating/cooling metal allows it to contract and expand (sorry if i'm patronising) beading it in, stressing it slightly and causing other metallurgical stuff that i only read about. so it has to be effected in some way.

Edited March 29, 2007 by brianthemagical

[Mikey G 3]

Heat cycling will harden them, slowing down the wear process.

 

But as its a competition/track engine its not likely to be run for 100k miles so longevity is not your priority

 

I built a 1.6 engine with too wild a cam, we managed to rev it to 8krpm+, and apart from a problem with the AFM causing it to go seriously weak it still ran after a few events and holds good oil pressure and compression. Engine had minimal running in before its first event, probably less than 50 miles of the odd road test?

 

As long as you let it run to full temperature and not overheat, then let it fully cool and repeat with increased revs it should be ok.

[zeolite 0]

Thanks for the info guys. I just couldn't understand why you would want to harden the prs when you are trying to wear them in and as the be bearings are lead flashed copper how they would be hardened either.

 

What I will do is add another cool down period on the day. I can always chuck in another set of bearings in 100 miles (about 2 years running ). The rings are the priority to get good compression.