Roush Engine Warranty Exclusions.

blykins · #1 (**permalink**) 11-02-2012, 06:55 PM

I don't understand the need for loose clearances. It's unnecessary.

Don · #2 (**permalink**) 11-04-2012, 11:09 AM

Quote:

Originally Posted by blykins

I don't understand the need for loose clearances. It's unnecessary.

Curiosity, the NASCAR motors that turn up to 9,100/9,300 RPM, loose or tight clearances? With the expectation that in the Sprint series the motor only needs to last for one race, probably a full season or less in the Modified series.

blykins · #3 (**permalink**) 11-05-2012, 05:01 AM

Quote:

Originally Posted by Don

Curiosity, the NASCAR motors that turn up to 9,100/9,300 RPM, loose or tight clearances? With the expectation that in the Sprint series the motor only needs to last for one race, probably a full season or less in the Modified series.

Tight. Under .002".

Loose clearances are a thing of the past. In the 60's/70's everyone kept opening the clearances up. It's not necessary and many SAE studies have shown that excessive clearance can cause oil to cavitate.