The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Mike V on April 24, 2010, 01:14:50 PM

Title: Allowable Ring Gap
Post by: Mike V on April 24, 2010, 01:14:50 PM

Anybody know what the recommended or allowable ring gap range is for Nikasil application (81 R65)?

My research from Bum's site shows gaps to be:
Top Ring = 0.020"
Center Ring = 0.020"
Bottom Ring = 0.013"

Factory manual:
Top Ring = 0.012" - 0.020"
Center Ring = 0.012 - 0.018"
Bottom Ring = 0.010" - 0.016"

I'm guessing ±0.006" to 0.008" in either direction based on the factory ranges?

Title: Re: Allowable Ring Gap
Post by: Barry on April 24, 2010, 01:21:51 PM

Mike

This document has quite a lot of info on ring gaps.

Title: Re: Allowable Ring Gap
Post by: Mike V on April 24, 2010, 01:36:02 PM

Barry,

Thanks a bunch.  Nice reference material.