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Re: bmw-digest V5 #277

While my BMW expierience is low, usually the reason for adjustable cam sprockets
is due to tolerance stack during manufacture. Each part has an accepted
tolerance,
and the more parts there are the more specs can drift. Adjustable cam sprockets
allow one to set cam timing to exactly factory spec, or in most cases to 
whatever suites the application best. Advancing generally increases bottom
end torque, retarding increases top end, very generally. Aftermarket cams
usually come with specs and adjustable sprockets sllows to set them properly.
   One should bear in mind that many mechanics may not know how to degree in
a cam,
as for stock stuff it's usually not worthwhile. 

>From: selig@domain.elided
>Date: Tue, 24 Sep 96 11:57:24 EDT
>Subject: <02> Adjustable Cam Sprocket
>
>Has anybody used the 2002 adjustable cam sprocket offerred by Bavarian
>Rennesport? There catalogue indicates that this is particularly useful 
>for engines that have had heads milled and/or block decks resurfaced.
>
>What is the principal of the adjustable sprocket on a SINGLE OVERHEAD CAM
>engine like the 02? I can understand varying the intake/exhaust timing on
>a DOHC engince, but this relationship would seem to be "fixed" on a SOHC?
>How is the timing variability acheived from distributor rotation different 
>from that acheived by an adjustable sprocket?  I've always assumed that as 
>long as you can set timing based on the steel ball on the flywheel that the 
>timing would be correct.
>
>Could somebody please explain what +/- of this modification on a 2002?
>
>Thx,
>
>Jonathan
>



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