Side pipe sound when off throttle/decelerating
Thread Starter
Racer
Joined: Feb 2013
Posts: 386
Likes: 3
From: Clifton Virginia
Side pipe sound when off throttle/decelerating
Anyone have side pipe sound that's like it's sucking air back in with loud burble? I mean sounds good to my ears but just wanted to know if anyone else has this sound effect coming from their side pipes.
Thread Starter
Racer
Joined: Feb 2013
Posts: 386
Likes: 3
From: Clifton Virginia
Yup. Louder in 3rd gear and less louder in 4th. Checked plugs and they are tanish brown. Re adjusted mixture after adjusting timing last week. But this sound existed way before adjustment of mixture last week. It's less louder than it used to be after advancing base timing tho. By all means, it's not popping or snorting. Sound actually is very nice to my ear.
Last edited by jackwabbit703; Apr 24, 2013 at 10:27 PM.
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
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Same with my chambered exhaust.
I have the same burble when I let off the gas at highway speed.
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
When you close the throttle at speed, the engine creates a lot of vacuum in the intake tract and at the same time exhaust pressure is a lot lower. Therefor it will suck the exhaust into the intake during overlap. The amount of reversion (burble you hear) will increase as the amount of overlap is increased.
Thread Starter
Racer
Joined: Feb 2013
Posts: 386
Likes: 3
From: Clifton Virginia
When you close the throttle at speed, the engine creates a lot of vacuum in the intake tract and at the same time exhaust pressure is a lot lower. Therefor it will suck the exhaust into the intake during overlap. The amount of reversion (burble you hear) will increase as the amount of overlap is increased.
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Verdad Gallardo
Team Owner
Joined: May 2001
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From: Western NY
IMHO, a lot of what the sidepipes sound like, is determined by the compression ratio of the engine. The early, high compression cars, have a sharper bite to their sound. The later, low compression cars, have more of a "motorboat burble" sound.
Although I didn't personally have the sidemount headers on a Corvette, I had them on a '77 Trans/Am I used to own. The T/A had a 400 cu.in. Pontiac engine, but a low compression version. At one point, I took it "around the block" with open headers, and it sounded pathetic...LOUD, to be sure, but pathetic.....
Although I didn't personally have the sidemount headers on a Corvette, I had them on a '77 Trans/Am I used to own. The T/A had a 400 cu.in. Pontiac engine, but a low compression version. At one point, I took it "around the block" with open headers, and it sounded pathetic...LOUD, to be sure, but pathetic.....
