Re: [DML] Exhaust Question: DMCH vs. DMUK.

["Bruce Benson" <delornut@xxxx>]

> Straight to the point, which exhaust system is better in >terms of
> performance?
,> -Robert
> vin 6585 "X"

There's really a lot to consider when designing headers. Larger tubes are
more free flowing but small tubes have a better scavenging characteristic.
Longer headers maintain good scavenging and increase torque. They create a
column of exhaust that actualy pulls the exhaust from the combustion
chamber. As RPMs increase the velocity increases and shorter headers work
better. The engines performance charateristic in regards to what RPM range
that power and torque are developed has to be the deciding factor in the
design. Headers also need a straight shot out of the head for at least a
couple of inches to prevent exhaust gases from piling up at the exhaust
port. It's also very important that the tubes are equal length. The DeLorean
doesn't have a whole lot of room for headers to conform to the ideal in
regards to all this but all of these things have to be considered and
compromises have to be made. The whole idea is to create the right velocity
of exhaust flow and if it's right it not only flows more freely, the
scavenging effect actualy drags exhaust from the combustion chamber until
the RPMs are high enough that velocity alone will push the gases out.

Bruce Benson