EXHAUST LENGTH

[WRM66]

Question: does it make a difference in total engine permorance if one exhaust pipe is shorter than the other? it wud seem to me that having both pipes the same length would mean equal perforance outta each cylinder....anybody know if it makes a difference?

 

[Five Five]

Thats a great question and a good item of discussion...
to answer your question.....Yes exhaust length does make a difference in performance....and there is an actual formula that engineers use to determine the diameter length...type of tip....etc.

 

[jimizee028]

I agree...great question....alot of thought..........had a slow day today huh????

 

[Five Five]

Dual Exhausts R&B Racing

For those of you who think duals are the only answer you are at least partially right. They don’t get the benefit of vacuum signals from the other cylinder but they do present an “equal” picture to each cylinder. Of course you still have the simplistic inlet tract screwing things up but that’s another topic. Each individual primary tube will have its own vacuum signal both from the reflected 1600 feet per second sonic wave as well as the slower 300 feet per second expulsion of hot, burnt gases.

The duals which start out at 2” are quickly taperd to 2.5” in the first 9” after the exhaust port by using a special seamless cone. The pipes are suited for large bore high compression motors . The taper or cone after the port is an attempt to broaden out the powerband and to smooth the transition with no internal steps from 2 to 2.5 inches. The length of these systems has been set at about 37.5" based on actual testing.

 

[BBChopper]

A true "tuned exhaust" would be the same length.:2thumbs: