Ehaust Gas Temperature at Muffler? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

honeybucket99 · 09-16-2011, 10:31 PM

Anyone know or have a good guess? I am trying to build a band stop filter to kill the 149.2Hz noise that is killing my hearing, and my calculations for length and volume are off due (I think) to the speed of sound in the heated air. If anyone has an educated guess, I'd be much obliged.

Anthony @ LG Motorsports · 09-19-2011, 12:46 PM

Remember it's going to change based off of outside air temp, load, throttle position, gear, MPH...

Even at the cylinder head exhaust gas will change 400-1800 degree's.

cab2g · 09-19-2011, 12:53 PM

look up Helmholtz chamber. You can build yourself a bandpass filter (of sorts) that way. Make the chamber the right length to reflect the inverse of the incoming 149Hz wave, you will cancel out most of the sound. No need to build an actual bandpass filter. There are lots of online calculators for this as well because this is commonly done for noise cancellation.

09-16-2011, 10:31 PM	#1
honeybucket99 Drives: 2SS/RS CGM CAMARO BEAST Join Date: Jul 2009 Location: carrollton, ga Posts: 425	Ehaust Gas Temperature at Muffler? Anyone know or have a good guess? I am trying to build a band stop filter to kill the 149.2Hz noise that is killing my hearing, and my calculations for length and volume are off due (I think) to the speed of sound in the heated air. If anyone has an educated guess, I'd be much obliged. __________________ 2010 CGM 2SS/RS; 418 stroker; JE Forged Pistons (offset wrist pin); Forged Crank; upgraded valvetrain; Custom Comp Cams Cam; Kenne Bell 2.8; ID 1000s; Aeromotive Fuel pump with return; ARH Long Tubes; Spec heavy duty clutch; 3" Magnaflow Cat Back; Nick Williams 102 mm Throttle Body; Tune fixed by Dave Steck; 815 HP and 14 mpg Upcoming-- Disintegrated drivetrain; Divorce if/when my wife catches on to my addiction

09-19-2011, 12:53 PM	#3
cab2g love. my. car. Drives: 2011 2SS/RS Join Date: Jul 2009 Location: Chicago Posts: 3,372 View My Garage	look up Helmholtz chamber. You can build yourself a bandpass filter (of sorts) that way. Make the chamber the right length to reflect the inverse of the incoming 149Hz wave, you will cancel out most of the sound. No need to build an actual bandpass filter. There are lots of online calculators for this as well because this is commonly done for noise cancellation. __________________

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09-19-2011, 12:46 PM	#2
Anthony @ LG Motorsports Drives: 1994 1LE / 2006 Z51 Corvette Join Date: Jul 2009 Location: Plano, TX Posts: 2,829	Remember it's going to change based off of outside air temp, load, throttle position, gear, MPH... Even at the cylinder head exhaust gas will change 400-1800 degree's.