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Old 07-13-2007, 10:07 PM
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Exhaust: Turn 8 into 6?

This is a random and I'm sure, unusual question. I'm swapping out the 232 in my 66 Ambassador for the 401 I've built ( viewable in my journal). I'm going to keep all the original badges and want this car to be a total sleeper. Does anyone have any suggestions as to how to make a balls-on,dead center V-8 sporting 12:1 compression sound like a mild straight six?

For a sound comparison, if you own the movie "Cars", I want it to sound like the Hudson Hornet from that movie. I know that the real Hornet had a V-8 with a triple carb setup (TriPower), but in that movie it sounds like a lopey I-6 and that's the sound I want. I'm curious to know what gives it that "old-time", for lack of a better word, tempo. Smaller pipes? A specific muffler? Different firing order(in which case I'll give up and just go with glasspacks. I'm not swapping the cam again)? Any insight is very appriciated!

Thanks!
Matt

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Old 07-13-2007, 10:35 PM
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Get some really, really quiet mufflers, a big speaker and hook it to an amplified recording of an inline 6.

I am not going to make any assesment of your current mental state. (although it is late on a friday night..... )

Later, mikey
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Old 07-13-2007, 11:20 PM
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HAHA! I'd say the assessment you didn't make is fairly accurate!
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Old 07-14-2007, 12:23 AM
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Exhaust sound

Keep the exhaust & tailpipe diameter between 1 3/4" to 2" and run 30" Smithy's glasspacks that's about as close as you'll get.
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Old 07-14-2007, 01:29 AM
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Quote:
Originally Posted by JeffB
Keep the exhaust & tailpipe diameter between 1 3/4" to 2" and run 30" Smithy's glasspacks that's about as close as you'll get.
Thanks JeffB, that's kind of what I was thinking. To get that higher tone I figured I'd have to get my exhaust velocity pretty high, but I wasn't sure if that sound was indicative of a really low overlap cam or if V-8s with the 1-5, or 4-7 swap made the difference.

I admit that in all my trucks and cars I've always oversized the exhaust. I know now that it just robbed me of my low end, since my engines rarely see 6000rpms or higher.
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Old 07-14-2007, 06:58 AM
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I know 180 deg. headers make a V-8 sound like a 6, IMHO. So the 4-7 cam might do the same thing.
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Old 07-14-2007, 12:28 PM
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Quote:
Originally Posted by Ambassador of 'Pane
For a sound comparison, if you own the movie "Cars", I want it to sound like the Hudson Hornet from that movie. I know that the real Hornet had a V-8 with a triple carb setup (TriPower), but in that movie it sounds like a lopey I-6 and that's the sound I want.
HUH?!?

First, the car in the movie was a CARTOON. Second, the real Hudson Hornet WAS an inline 6 - 308 cu in with the "Twin-H" dual one barrel carb setup.

Quote:
Originally Posted by powerrodsmike
Get some really, really quiet mufflers, a big speaker and hook it to an amplified recording of an inline 6.
Funny you should mention that. When I was a kid in the 60s, there was always a tiny ad in the back of Hot Rod for a product called "Wheel Squeal". This was a speaker that you mounted in the rear wheel well and hooked up to your (8 track) tape deck. The kit also came with a tape.
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Old 07-14-2007, 12:30 PM
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lots of dynomax bullets 6-8 and a pair of turbo mufflers
Shane
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Old 07-14-2007, 03:32 PM
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Quote:
Originally Posted by redsdad
I know 180 deg. headers make a V-8 sound like a 6, IMHO. So the 4-7 cam might do the same thing.
Yeah, if you could get one for a 401 AMC motor...
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Old 07-14-2007, 09:12 PM
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you could also get a Vroom box http://www.vroombox.com/vroombox/



Shane
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Old 07-15-2007, 07:35 AM
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If you yank off a plug wire or two it will give you a lope but it still won't sound like a six. I knew a guy that used to pull off one wire on his 289-powered Mustang and drive around town. He thought it made it sound like he had a big cam. I just thought it sounded like it had a miss.


Quote:
Originally Posted by joe_padavano
HUH?!?

Funny you should mention that. When I was a kid in the 60s, there was always a tiny ad in the back of Hot Rod for a product called "Wheel Squeal". This was a speaker that you mounted in the rear wheel well and hooked up to your (8 track) tape deck. The kit also came with a tape.
Now that is pretty funny! I never saw that ad. I didn't need a speaker for that sound, I got into enough trouble making that sound for real.
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Old 07-16-2007, 08:00 PM
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A possible way to make your 8 sound like a 6 would be to build two sets of headers with a three into one and use glasspacks on those two pipes; and run the extra two cylinders into a third pipe with a very quiet muffler. That way you might approach the sounds of a split exhaust manifold on a six cylinder.
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Old 07-17-2007, 08:15 AM
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Quote:
Originally Posted by home brew
A possible way to make your 8 sound like a 6 would be to build two sets of headers with a three into one and use glasspacks on those two pipes; and run the extra two cylinders into a third pipe with a very quiet muffler. That way you might approach the sounds of a split exhaust manifold on a six cylinder.
Uh, won't this weird and restrictive exhaust system defeat the whole purpose of putting a 401 in the car to start with? Look, while I understand the desire, the reality is that any oddball combination of funny split headers/mufflers/pipes will hurt power and is unlikely to give you the sound you want anyway. Just get a good 2.5" or 3" exhaust system with an X pipe and run the long Dynomax turbo mufflers. The car will be reasonably quiet, which keeps them guessing, and will still have the power you want.
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Old 07-17-2007, 08:30 AM
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shhhh, Joe, you're stifleing their creativity.


hahahahahahahahaha

what could be the greater illusion than a 401 that sounds and RUNS like a 6 too...

I'm just messing with you guys..

hahahahaha

Homebrew is really just trying to help 'Pane with his vision..in a very innovative way, I might add


later, mikey
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Old 07-17-2007, 09:41 AM
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Quote:
Originally Posted by powerrodsmike
shhhh, Joe, you're stifleing their creativity.
what could be the greater illusion than a 401 that sounds and RUNS like a 6 too...
Homebrew is really just trying to help 'Pane with his vision.. later, mikey
mikey is correct. If I was building a sleeper I would put some very stock type mufflers on the pipes to quiet it as much as I could. Then I would put electric cutouts just behind the collectors for my wide opens runs.
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