Date: Thu, 9 Jan 1997 08:39:45 -0800
From: Robert King <rdking@mail.arc.nasa.gov>
Subject: Re: Valve Train Geometry, Theory meets M

Rocker geometry is set up so that (all) the adjuster(s) sit in the 'middle'
of the valve stem with the valve at half-lift.  If you then rotate the cam
you will see that the adjuster then moves over a wider surface of the valve
stem as lift varies (rotating the valve)......the two variables you can
adjust to alter your rocker geometry are rocker arm height (as Mike
discusses) and/or pushrod length.  This will give you the longest life and
most efficient operation of the upper valve train.  If you have the eye of
a hawk you could do it 'by eye'.  Having the eye of a limulus I do it with
a dial guage..

Given the fly cutting, case facing etc that goes on, everyone should cast
their eye over the rocker geometry of a rebuilt engine....

Rob K.


>Quoting Mike West:
>
>"Looking down from the intake side like they were on the engine, the
>adjusting screw center should be in the center of the valve stem.
>
"
>
>HUH?  I thought the valve stems are supposed to be off center to adjustors
>so the valve ROTATES as the adjustor bangs it (pushes it) and  thus

>MB in NJ


----------------------------
Robert King
rdking@mail.arc.nasa.gov (work)
spectro@hooked.net       (home)

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