Re: [ST] Valve Shim Replacement - Another Perspective [was:Crankstorycontinues...]

[Neil Lindsey <Neil.Lindsey@xxxxxxx>]

I can think of some possible advantages to shim-under-bucket, but I may
have missed something much more fundamental too ;-)

Typically the shims will be smaller in diameter, which means that
replacements should be a bit cheaper -- I don't think this makes the
design necessarily any better though

The shims themselves will not be subject to the same possible direct
wear from cam lobe -- this is probably not that much of an issue either,
since shims should always be measured anyway before they are replaced
(rather than relying on the label) -- the down side is that the bucket
would be subject to wear from the cam lobe, but perhaps this is much
harder material -- IOW, perhaps the shim hardness requirements are less
when compared to the 'over-bucket' design

I suppose there is a remote possibility that an 'over-bucket' shim could
become dislodged under rare valve-float conditions (OTOH this seems like
a stretch to me -- anyone know?)




----- Original Message ----- 
From: "Adrian Mansell" <amansell@xxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Monday, April 25, 2005 11:34 AM
Subject: RE: [ST] Valve Shim Replacement - Another Perspective
[was:Crankstorycontinues...]



Can anyone explain to me why shim-under-bucket is better than
shim-over-bucket?


> -----Original Message-----
> From: st-triumphnet.com-bounces@xxxxxxxxxxxxxxxxxxxx
> [mailto:st-triumphnet.com-bounces@xxxxxxxxxxxxxxxxxxxx]On
> Behalf Of Rick
> & Joyce
> Sent: 25 April 2005 19:25
> To: ST@xxxxxxxxxxxxxx
> Subject: RE: [ST] Valve Shim Replacement - Another Perspective
> [was:Crankstory continues...]
>
>
> This conversation applies to first-generation 955i and earlier 885
> shim-OVER-bucket engines.  For our purposes, that's the '01 and
> earlier ST/RS.  For multi Triumph owners, my recollection is the '01
> Tiger and Daytona were the first models to get the second-generation
> 955i, shim-under-bucket engine as fitted to the ST/RS in '02.
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