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DDG
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Post subject:  Posted: Tue Sep 09, 2008 3:39 pm |
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| I sprinkle rubber on my Cherios |
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Joined: Fri Sep 03, 2004 10:06 pm
Posts: 397
Location: Woodland hills(Los Angeles) CA.
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What makes 5cyl or any odd numbered engine (v10s included) have that "undertone", is they create a "beat frequency" in the exhaust note.
Wikipedia: "In acoustics, a beat is an interference between two sounds of slightly different frequencies, perceived as periodic variations in volume whose rate is the difference between the two frequencies."
A 110 Hz A sine wave (cyan), a 104 Hz G# sine wave (magenta), their sum (blue) and the corresponding envelope 6 hz. (red)
I believe it has to do with the fact that the firing pulses don't line up with one revolution of the crank. I know fives have a firing pulse every 144°, but I think it has to do with the fact you're trying to lay five over two... if that makes sense! (if your'e a drummer you know what I mean)!
I also believe 3's 7's and inline 9's should sound similar if not the same.
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colt.45
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Post subject: Posted: Wed Sep 10, 2008 10:44 am |
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| Redline? |
Joined: Sun Jul 20, 2008 12:32 pm
Posts: 100
Location: nc and ct
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on the m3 rally video. its a normally aspirated m3 motor. i believe it was 2.4 or so 4 cyl. and i found a different video of that same car, and its a sequential transmission
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dan colt
94 s4
90 coupe
91gti
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Quattro Krant
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Post subject: Posted: Wed Sep 10, 2008 2:56 pm |
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| I sprinkle rubber on my Cherios |
Joined: Fri Jul 22, 2005 8:57 am
Posts: 487
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LS2 sounds GREAT
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Richard Krant
2000 A4 Avant
1987 4000CS Quattro-FU(K THIS PROJECT!!!!
1986 4000CS Quattro
1985 Ur-Q
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3B'dB3
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Post subject: Posted: Wed Sep 10, 2008 4:59 pm |
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| mach 2 with my hair on fire |
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Joined: Fri Jul 22, 2005 8:57 pm
Posts: 1241
Location: central MA
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Any MotoGP Bike sounds amazing.
its the loudest thing ive ever experienced.
http://www.youtube.com/watch?v=kbpqe-wvcuU
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evan nelson
'90 90q20v - gone 
'90 Miata (yes, thankyou. I know my car is cute. lets move on  )
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DDG
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Post subject: Posted: Wed Sep 10, 2008 5:04 pm |
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| I sprinkle rubber on my Cherios |
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Joined: Fri Sep 03, 2004 10:06 pm
Posts: 397
Location: Woodland hills(Los Angeles) CA.
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3B'dB3 wrote: Any MotoGP Bike sounds amazing. its the loudest thing ive ever experienced. http://www.youtube.com/watch?v=kbpqe-wvcuUWhat's the configuration? sounds like a 4cyl to me....
I know the old school GP bikes were 2 strokes, some were "V3s"!
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DDG
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Post subject: Posted: Wed Sep 10, 2008 5:30 pm |
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| I sprinkle rubber on my Cherios |
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Joined: Fri Sep 03, 2004 10:06 pm
Posts: 397
Location: Woodland hills(Los Angeles) CA.
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3B'dB3 wrote: yep, all 4cylinders now, I think they're all V'4s too, i could be wrong.
4 stroke, 800cc, figure about 250+ hp on a 350lb machine.
That's about the same or greater hp to weight than an F1 car. But! an F1 car can put it power to the ground better, especially at high speeds.
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HighDesertAudi
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Post subject: Posted: Sat Sep 13, 2008 12:22 pm |
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| kickin' tires'n lightin fires |
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Joined: Tue Mar 20, 2007 5:23 pm
Posts: 603
Location: BEND
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The I5 is so unique sounding, it's great. Other engines I love to hear are Flat 6's in Porsches, VR6's, and a 2.7T with ASP exhaust  http://www.youtube.com/watch?v=PLIxGqPTdrA
V8's don't reallyl do much for me, but I like the sound of most exotic engines V10, etc.
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Previous Audi's
1999 Audi A4 1.8TQM Laser Red
2000 Audi S4 6spd Nogaro --- 297awhp & 335lb/ft
1990 Coupe Quattro Lago Blue
Current Audi
2000 Audi S4 6spd Laser Red FOR SALE
2004 Audi S4 6spd Dolphin Grey
2004 Audi A4 Avant 1.8T Quattro 6spd Brilliant Black (Wifey Mobile)
Last edited by HighDesertAudi on Sat Sep 13, 2008 12:25 pm, edited 1 time in total.
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DOC
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Post subject: Posted: Sat Sep 13, 2008 11:14 pm |
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| Chirping second |
Joined: Mon Oct 18, 2004 11:53 pm
Posts: 84
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a large bore tt exhaust from AJ6 engineering, on a v-12 Jag with steroids. Sounds similar to the twin six cylindered fuel dragsters of the 60's.
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