The driven side of the chain defines the geometry; the idle side has no
influence. A variable cam sprocket (variable degree wheel) would provide the
effect you seek, but is a complex undertaking.
- Bob Mann
Dat2000srl@aol.com wrote:
>
> Is it possible to acheive variable timing by adjusting an idler pulley on the
> timing chain. Intead of having the slack on the back side of the chain, have
> a set of rollers or gears that can be moved, or tuned through a motor turning
> a worm screw that threads through a block, that will move the slack of the
> chain, thus varying the cam timing. I thought about this months ago, but I
> don't mave access to a machine shop to make the mechinism. Even if I did, I'm
> not sure I would experiment on the U20. The taught side of the chain may have
> too much pressure for this too work, or the mechanics involved may not be
> adaptable to the engine.
> Larry
> Baltimore
>
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