On Mon, 07 May 2012 22:56:02 +0200, David Gravereaux >
wrote:

> Just venting...
>
> Motor is stock down under with EMPI 3417 merged header exhaust, Weber
> ICH dual carbs and SCAT 1.25 ratio rockers. It runs great 'cept I
> forgot to change the front engine seal when I had the flywheel turned,
> thus it drips quite a bit.. I'll pull it sometime and fix it. Oil temp
> even on hot days on the highway never pass 215F ever. The cooling
> effect of dual carbs is amazing.
>
> Why the hell do I have to keep adjusting valve lash all the time? I
> just did 120 mile road trip yesterday and could hear a valve tightening
> up on me and adding the off-beat to the engine sound. I'm doing .004"
> when dead cold.
>
> Last time it was intake #1 got tight. This time, intake #1 again with
> ext#3 and ext#1 also tight. GRRRR.
>
> Years ago, I told my mother not to get a Porsche 912 becuase, "It'll be
> in the shop every other week to have the valves adjusted".
>
> I am my own advice now.

The valve lash is specified to 0.10mm intake and 0.15mm exhaust on the
later engines, so your intakes are adjusted correctly, I have run 0.10mm
on the exhaust also but that is cutting it very close, I used to loose
compression after extended periods at WOT, as in very difficult to restart
whilst still warm.

You are either experiencing valve stretch or seat sinking. In theory it
can also be seat corrosion from unleaded fuel if the material is not
right, quite uncommon these days though..

J.
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