Aussieveedubbers · Tech Talk

Big end bearing sizes for a Type one

https://forums.aussieveedubbers.com/threads/93973/big-end-bearing-sizes-for-a-type-one

Craig Torrens · 23 Nov 2011, 9:40 pm

What is the largest "under sized" big end bearing for a type one crank ?

I've heard they go up to 2mm under sized, but that sounds extreme !!

matberry · 23 Nov 2011, 9:52 pm

My 1st thought and 1st check in a suppliers catalog goes to +1.5mm

Craig Torrens · 24 Nov 2011, 2:53 pm

cheers

psimitar · 3 Dec 2011, 11:01 pm

the 2mm is only for the thrust bearing. Journals I though only go to 1mm as beyond that there is no casehardening left on the crank.

Yea, just checked and 1mm crank, 2mm crankcase and 2mm thrust.

matberry · 4 Dec 2011, 7:37 am

I think you'll find 1.5 BE bearings. Mains come in up to 2.0mm on the back (case) and .75mm on the crank. Re-nitriding is possible to re-harden the crank. This is done to all modified and some reground cranks if done right as the nitriding is only around .005" deep (iirc).