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Re: Piston pin buttons

To: chichm@planet.eon.net
Subject: Re: Piston pin buttons
From: Derek Harling <derek.lola@sympatico.ca>
Date: Wed, 03 Feb 1999 14:24:59 -0500
marcel chichak wrote:
> 
> Why would you use them on an S anyway? They have press fit pins.
>
>  This time because the teflon buttons had WORN OUT and
> the circlips bounced out of their groves.
> 

You are correct - I used them on a 998 not the "S".

But we used them WITHOUT circlips. Machined them with a shoulder to go
inside the pin ID [about .250/.350] and with a slightly shaped head for
cylinder wall contact. Sorry I can't tell you what grade of Teflon we
used - maybe in that respect we were lucky. After - oh - six race
weekends the buttons showed no sign of wear, heat or oil degradation and
we used them again for another six or so weekends - still no degradation
[on the buttons anyhow!].

Derek

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