[Vwdiesel] Fwd: Re: Exausts & back pressure

[James Hansen]

This may cut your exhaust scavenging down substantially.  All cylinders 
coming to a common pipe allows the velocity from the exhaust stream of 
one cylinder to create some suction after the valve closes, in effect 
sucking out the exhaust from the next one to open.  Going too big also 
adversely affects this, but to a lesser extent.  That's why there's the 
little plate in the middle of the diesel manifold exit- to direct the 
stream to the pipe outlet, and create a scavenging effect.
-James

paul lew wrote:
> What would happen if instead of widening, you put another muffler line in parallell,you'd be modifying the output anyways mabe there's a dual out from a different VW, and this way you wouldn't be wasting a exhaust line.
>   Paul
> 
> Note: forwarded message attached.
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