Rebuilt 2.5 motor break in

[harnishclan]

Originally Posted by mikefocke

Have you identified a common cause for the engine failures?

Completely different. First motor lasted two event after I bought the car, poor maintenance is likely as the first oil change was bad. Ate the main bearings. Second motor (used no history) lasted 10 events and broke timing chain coming out of turn 9 at Houston Motor Sport Ranch. ALL valves are open and about half are bent.

Considered a deep sump with baffles, oil pump kit, etc or was that part of your rebuild?

Mantis 1.2L pan, S oil cooler.

Originally Posted by Flavor 987S

And install a magnetic drain plug. L&N makes a good one. Torque spec is very low. 19ft.lbs. FYI

Done

Originally Posted by thstone

Contact the shop who did the rebuild. They should have a recommendation for the break-in procedure for one of their engines.

While very experienced, he just did the M96 class and doesn't have solid info to run in a track motor.

Originally Posted by Gelbster

Q's advice is good but it is good for a Track car.
Many will miss that in the first Post.
For a road car, less extreme oiling upgrades may be sufficient.

Its a track only car, heading towards SPB (though budget and build slightly derailed by an extra 10K in motors) so there are limitations to what you can modify. Dry sump might be a step too far. Accusump is about as far as it seems you can go.

[thstone]

Originally Posted by harnishclan

While very experienced, he just did the M96 class and doesn't have solid info to run in a track motor.

Hmm. They didn't mention run-in during the rebuild class? As a M96 rebuild class participant, couldn't he just contact Jake to get more information?

With that being said, I have two friends that had their engines professionally rebuilt recently and they were told that the break-in period was 1,000 miles. During this time they were supposed to drive the car at varying speeds (streets and highway) but avoid rev's over 4K rpm. Oil was supposed to be changed at 500 miles and again at 1,000 miles.

I can't say with any confidence whether this applies to your engine or not, but it is what others are doing.

[harnishclan]

Might have a plan