> Fluid dynamics, Cale is a thinking man !
>
> Okay, what happens to the exhaust gases as they travel further away from
> the engine ? It cools off. What happens to gases as they cool ? They
> contract. When the gas contracts , it slows down. This minimumizes
> scavenging. How do we speed it up to scavenge better ? We reduce the
> pipe size. I think exhaust systems should be designed with ever
> decreasing diameters every couple feet to keep the flow pulses velocity
> up for scavenging and to hold some pressure for the break into the
> atmosphere. If the gasses are below atmospheric pressure like with a
> pipe too large, why would the exhaust gas exit ? The higher pressure
> inside the pipe sucks the exhaust out into the atmosphere.
>
> A true dual exhaust on a V8 engine makes it run like two four cylinders
> mechanically attached, and scavenging is cut in half with only half the
> pulses pulling twice as far apart.
This is very good technical info!! Now may I bring up a question, which
may/may not be worthy of this very good technical discussion: What does
exhaust pipe length do for performance? Is having the shortest possible
exhaust system the best? For legality reasons/emissions, is there a length
the exhaust pipe must be on truck? I want to say it just has to go past the
axle, but then again there are Fords from the factory which have the exit
pipe coming out on the passenger's side, BEFORE the rear tire/axle. Anyone
know?
Kyle
93 Dakota 4x4 V6
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