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Old 02-20-2011, 01:26 PM   #1
marticus24
 
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Will a cam change the exhaust note?

Question is simple: will a cam change the NOTE of the exhaust? I understand there will be a change to the rhythm/added lope, but will it actually change the tone?
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Old 02-20-2011, 01:31 PM   #2
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Yes. In several ways. Valve timing can increase or decrease the effective compression which changes the sound. An earlier opening exhaust valve event will make it louder as your hearing more of the combustion. A tighter LSA and more overlap will make it louder...

I changed the cams in my Harley that had about 20 deg earlier opening intake valve, and 16 deg earlier opening exhaust valve... and it is much louder now. Due to the increased compression from the intake opening sooner ,and with the exhaust valve opening so early, you really hear the exhaust bark.

The OEs won't use timing like that though because of emissions. They want all the combustion to occur in the chamber by using little overlap and late opening exhaust.
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Old 02-20-2011, 01:35 PM   #3
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Considerably.

EG:
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Old 02-20-2011, 01:41 PM   #4
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Yep
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Old 02-20-2011, 03:52 PM   #5
marticus24
 
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Thanks guys!

Now - 2nd question... has anybody with a similar setup to mine done a cam and have a vid/audio clip?

I'm running Kooks LTs, catted mids, rotofab cai, and borla s-type cat back...
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Old 02-20-2011, 04:19 PM   #6
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my car got louder with a cam. not just at idle
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Old 02-20-2011, 05:26 PM   #7
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Quote:
Originally Posted by marticus24 View Post
Thanks guys!

Now - 2nd question... has anybody with a similar setup to mine done a cam and have a vid/audio clip?

I'm running Kooks LTs, catted mids, rotofab cai, and borla s-type cat back...
I have somewhat the same exhaust setup as you.. Watch the end of the vid in my thread when I close the cutouts, I'll get some more vids after I get it tuned
My mufflers are magnaflow
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Old 02-20-2011, 05:35 PM   #8
marticus24
 
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Quote:
Originally Posted by Kurtisp View Post
I have somewhat the same exhaust setup as you.. Watch the end of the vid in my thread when I close the cutouts, I'll get some more vids after I get it tuned
My mufflers are magnaflow
Please do post another vid after you get tuned, perhaps similar but with cutouts closed. I'm really trying to gauge how things will sound with a cam.

I'm considering Livernois' 2c cam.

Thanks for all the input all, keep it coming
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