[TR] Valve Clearance

[Dixie]

On a performance camshaft the gaps are almost always set slightly wide. The 
theory is that it creates a shock wave to the valve which is supposed to 
improve the efficiency.  Personally I would stick with 0.10" I hate rattly 
tappets.

Adrian TR4A CT64306 O
Wales UK

----- Original Message ----- 
From: "Greg Lemon" <glemon at neb.rr.com>
Cc: <triumphs at autox.team.net>
Sent: Tuesday, March 20, 2012 2:12 AM
Subject: [TR] Valve Clearance


>I have notice on another thread discussion of valve lash if you have a 
>non-stock cam how the cam grind can affect valve adjustment.
>
> So here is my question.  I have a TR250 with a very mild cam grind.
>
> The grind is very similar in specs to the TR5 cam, though not identical, 
> lift and duration are very close.
>
> The cam grinder's lash spec is .014" stock is .010".  However, the cam 
> grind data is from a "British Performance" generic cam grind sheet, not 
> specifcally for
> a TR250/6 motor.
>
> I did some research and the spec for the TR5 grind is if anything slightly 
> more agressive than what I have (very slightly), and the valve lash for a 
> TR5 is the
> same as stock TR250, .010".
>
> I have it set to .010" and all seems fine, idles good, accelerates 
> smoothly and strong, etc.
>
> Any thoughts, .010"?, .014"?, split the difference .012"?
>
> Greg Lemon
> 68 TR250
> ** triumphs at autox.team.net **
>
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