Primary gear floating bush
Turbo Mini Forums

Been running this for years, its one of Calvers ones.
I built the engine a few weeks ago and its probably done 5 miles at most in 1/4 mile spurts at Avon.
Went to pull the primary gear out and the bush had stuck itself to the crank, awkward as its still in the car, had to take off the drops case and carefully chisel it off. For some reason its shrunk.
There are no marks on the crank and no signs of fretting or pick up on the inside of the bush, the other primary gear goes on and spins freely. Very odd.
Anyone heard of these bushes shrinking for any reason?

Paul

I seriously doubt it!

I'm sure these bushes were the early ones from Calver that we had to put a chamfer on the inner edge to prevent rubbing on the radius of the crank. So is it pos you put it on the wrong way round and its rubbed got hot and shrunk. Its about the best I can come up with.

http://i28.photobucket.com/albums/c248/spe...er1/mini007.jpg

If it a'nt broke don't fix it !!!!!!!!!!!!!!!!!!!!!

Youre right, we did chamfer it, but it was deffo on the right way.
Im stumped!

Paul

I seriously doubt it!

I'd have thought it would be the chamfer as well - it may just be a tolerance thing - has the bush blued up?

JK

If Carling made Mini engines
it would probably be like this one!

Its not the chamfer, there are no marks on it, still shiny. Ive been running this particular bush for about 5 years, never had an issue with it, fitted it the right way round etc.
It has simply shrunk

Paul

I seriously doubt it!

could the outer cir cumrerence of the primary acted with the inner circumference of the crank to roll it smaller, like an english wheel?

yes Paul i no what your saying they can get stuck if there the wrong way around, But i'm sure in your case it wasn't that. can't really add more to this sadly.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

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