Just curious about what causes different type of exhaust notes. For example, rumble sounding exhausts are normally caused by unequal length headers (ex STi), but what about : 1. Deep/low
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02-15-2012, 11:25 PM | #1 (permalink) |
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Understanding exhaust notes
Just curious about what causes different type of exhaust notes. For example, rumble sounding exhausts are normally caused by unequal length headers (ex STi), but what about:
1. Deep/low pitched exhaust 2. High pitch (not necessarily exclusive to rpm's above 8/9k) 3. Rumble sound even with equal length headers (ex. GT40, SLS) 4. Exhaust crackle when you let off the gas I'm simply trying to learn about the acoustics of exhausts so any relevant info is appretiated. Other types of sounds and their explanations are very welcome.
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02-16-2012, 12:03 AM | #3 (permalink) |
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Certainly this cannot be the only factor, as there are many variations than just high and low pitches. Or do you mean different types or methods of resonation?
Off topic, does anyone know the highest pitched exhaust for the Z?
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02-16-2012, 04:10 AM | #4 (permalink) |
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engine configuration, # of cylinders, total airflow (e.g. horizontally opposed or flat motors, 90* V, inline or even Volkswagons W motors....and the exotic 12cyls of Ferarri) plus exhaust pulse scavanging. I dont know if anyone here has the search skills to find this but....back in the 80's or 90's some NASCAR teams ran 180 degree headers (I cant explain why they're called that) but the cars sounded like they were reving much higher. Folks said it sounded like a swarm of bees compared to the standard configuration.
Ever wonder why Harley sounds so powerful but they can't make any horsepower? (all you H-D lovers remember...the V-wad is a PORSCHE designed motor). V configuration and a tractor motor firing sequence. I rode a 130 HP VTX 1800 for 4 years. V twin configuration...didn't sound or run like a Harley. 2nd question I believe the Meistershaft is the highest pitch I've heard. http://www.youtube.com/watch?v=MSZTb...eature=related Last edited by Hermitns; 02-16-2012 at 04:16 AM. Reason: add comment.. |
02-16-2012, 10:31 AM | #5 (permalink) | |
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1. Deep/low pitched exhaust Generally larger diameter tubing 2. High pitch (not necessarily exclusive to rpm's above 8/9k) Generally small diameter tubing. A system design that has sudden expansions or sudden contractions. Chambered mufflers. 3. Rumble sound even with equal length headers (ex. GT40, SLS) The "off beat" sound can be the total system design. 4. Exhaust crackle when you let off the gas Engine tune and exhaust cam phase. And it helps to have a high flow exhaust. |
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02-16-2012, 02:08 PM | #6 (permalink) | ||
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I'm going to check out the Meistershaft now. Quote:
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02-16-2012, 02:20 PM | #7 (permalink) | |
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02-16-2012, 02:52 PM | #8 (permalink) |
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I believe Meistershaft is the loudest, but not the highest. Check out Saclam exhausts. They sound like they have the highest pitch. I'm not sure if they still make them, but they occassionally pop up in the used section.
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