Different compression ratios, heads, and who knows what all make for different sounding engines. I was at the drags one night last summer, and standing next to the water box. All the rails came through, and several were quite loud. All had B/B engines.Then this one rail comes up , and I mean, it hurt, not just your ears, this thing hurt your insides, down in your gut. It sounded completely different, and it ran completely different also. When we left, he was in the finals, and running about 3/10th faster through the 1/8th than all the others. I don't know what was different, but it was that noticable!

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1972 Malibu (1 st. car) Project waiting to happen
Team Chevelle # 427
A.C.E.S. # 1282

 

so what make an engine quiet(er)?
In 100 plus years of the ic engine someone has to know.

 

talking about V8's in general Id say 90% of it is exhaust system.. the other 10% being heads, CR, CID, etc...

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Mike Reeh
Gold #34
San Diego, CA

 

Doug makes a good point.Keeping that in mind,a few old timers told me that motors do have "personalities".You could probably build duplicate motors with same parts and specs,and 1 of the 2 will be stronger and more lively to drive.Just kinda how machinery is...and you could probably have a dog in the mix too...Interesting question...Shawn

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so who here has a mellow sounding engine and what is your setup.

 

Mine has Turbos and it is quiet till you get on it then it gets loud.Want quiet add mufflers more then 1 or resonators...FRED

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what are resonators ?

 

I just stumbled onto the answer for question e), Why the Corvettes are so quiet. It seems they designed the muffler for the specific fluid dynamics of the engine induction/displacement/exhaust and pipes of the Corvette. For a brief explanation see: http://www.corsaperf.com/arsctech.htm

 

Do you have the part numbers for your Dynomax Exhaust System (everything, including the "X" Member)? We have the Ceramic Coated Dynomax Headers on our '69 Elke Frame Off Resto, and want the rest of the Dynomax System. Yours "SOUNDS" like what we want. Our motor is the 330HP/350 GM Vortec Crate Motor.

Any info would be greatly appreciated.

Thanks,

Richard, Judy and MAXX2
Team Member(s) 341


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Resonators are just like a muffler only smaller, same size pipes just smaller overall.Check with your muffler shop...FRED

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my exhuast was just super Hemi turbos (the long ones and a x pipe kit from dr gas.

 

I know that my 355 with Sportsman 2 heads, team g intake,10:1 compression, and a Lunati thumper series is really loud.

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Chris H.

 

462
Exhaust -headman headers 1 3/4 to 3 X 9" collector and 2.5”exhaust to Walker/Dynomax Super Turbo mufflers (#17749) 2/14” tail pipes, stock tips2.5 exhaust pipes
dynomax super turbo #

mellow til you get on it then throaty
really nice... but i dont like that loud cab noise

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Rich
Cocoa Beach, Fla
Team Chevelle #380
46 but feeling like 20 when i'm in my 70 SS 454
wa3men@aol.com
www.chevelles.com/showroom/70_SS_454.jpg

[This message has been edited by 70 SS 454 (edited 03-15-2000).]

 

One big factor in exh sound is camshaft profiles, more lift, duration, lobe seperation and overlap, The more air you push through an eng. the louder the exh.(usually). If you take an eng. and only swap out the cam the exh. tone will change.

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71 Chevelle 454
65 Elco 4x4
68 Firebird 400 Conv.

 

1 to 70 ss 454 : is that 462 ci. ? and you have almost the same setup as i do,except for the smaller (louder mufflers) an no xpipe.
2 What would be a quieter cam profile ?
I have a 278 crane with 222@ and .467 lift right now.

 

From my experience, I think Bret has it. Camshaft is the biggest factor after exhaust (mufflers/ pipe size/ exit point.)
Seems some wild dragsters open the exhaust with very high pressures still in cylinders - POW - POW - POW MMMMMMMMM love it.

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Gotta have a Chevy !In Durham N.C.
Make it look the way you like it, forget what the other guys say!

 

Ive got my big block blowing through 2 1/2 inch pipes that run into a pair of Maremont Cherry Bombs. From there it flows through the stock tailpipes with resonators. Around town you can sneak by the boys in blue all day long, but when you open it up...., well lets just say ive been known to set off car alarms.

 

in reply to your post above doug, in one word, nitro. even a small percentage makes your eyes water and your heart beat fast.