The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Mike V on March 28, 2010, 03:32:28 PM

Title: Rings for Nikasil Cylinders
Post by: Mike V on March 28, 2010, 03:32:28 PM

Guys, help me get this straight. I always thought the Nikasil cylinders were to be fitted with the non-Nikasil rings. And vise-versa. I've just received information (unless the source was incorrect, or misinterpreted) the correct rings for my 81 R65 Nikasil cylinders are supposed to be Nikasil rings. Numerous LIST archives searches found nothing specific unless I exhausted my search too soon.

Can someone clear this subject up for me?

Title: Re: Rings for Nikasil Cylinders
Post by: Bob_Roller on March 28, 2010, 03:54:38 PM

My best guess, is that you want plain iron rings on a plated cylinder, as the two parts wouldn't get 'broken in' if they were both chrome or nickel plated, and you would have high oil consumption .

I went to the official BMW parts site, and they only list one number for piston rings, stated to be a kit, so I assume this is for two pistons .

BMW part number : 11 25 1 337 401 .

Title: Re: Rings for Nikasil Cylinders
Post by: montmil on March 28, 2010, 04:17:40 PM

In the aviation world, I'm pretty sure that chrome cylinders do not get anything but iron rings.

Monte

Title: Re: Rings for Nikasil Cylinders
Post by: Mike V on March 28, 2010, 04:49:51 PM

Thanks guys, that was my understanding.  I will pursue this further.