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Re: SVO: XR racing, and downpipes...

Monty Abbott wrote:

> Don't forget that a 3" downpipe will hold a lot more volume.  This will
> allow considerably gas to compress in the down pipe section, so the intial
> spin-up time should be more responsive.

This is what was discussed before as the "expansion chamber" theory.
The increase in volume is not significant when compared to the rate
of flow.  The principle is correct, but the effect is negligible.

> Also, there will be a small
> theoretical gain just from having less restriction in the length of the 3"
> downpipe.

Also negligible unless downpipe is a significant portion of the total
resistance to flow.  It should not be...