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WARP TEN · 12-10-2013

The closed chamber of the Corsa is a Helmholz resonator that attenuates the resonance at a specific frequency. Our engines generate resonance spikes at about 1,800 and 3,400 rpm with a little also at about 2,400. The stock system uses the same technology. Corsa calls it quarter wave tuning. Essentially, the sound waves go into the closed chamber and based on its size and shape, sound waves of a particular frequency will cancel each other out. I forget which frequency the mufflers deal with, I think the 1,800 one, with the center resonator handling the 3,400 rpm resonance spike. By the time exhaust pressure gets to the muffler, the single pipe is more than enough to flow the gases without much, if any, back pressure. March Haibeck has done a fair amount of testing on exhaust system performance. --Bob

12-10-2013	#6
WARP TEN Join Date: Apr 2007 Location: Lake Bluff, IL Posts: 2,141	Re: Looking for cutaway pic of Corsa Muffler The closed chamber of the Corsa is a Helmholz resonator that attenuates the resonance at a specific frequency. Our engines generate resonance spikes at about 1,800 and 3,400 rpm with a little also at about 2,400. The stock system uses the same technology. Corsa calls it quarter wave tuning. Essentially, the sound waves go into the closed chamber and based on its size and shape, sound waves of a particular frequency will cancel each other out. I forget which frequency the mufflers deal with, I think the 1,800 one, with the center resonator handling the 3,400 rpm resonance spike. By the time exhaust pressure gets to the muffler, the single pipe is more than enough to flow the gases without much, if any, back pressure. March Haibeck has done a fair amount of testing on exhaust system performance. --Bob __________________ 2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough"