Re: [Amc-list] scavenging in a stock exhaust system?

[Wrambler242@xxxxxxxxxxx]

I've heard different theories.
One is run large pipe back to the muffler then smaller pipe.
Supposedly this creates a ventrui like effect.
I do not know the science of it much.
I't understand if if I read it,but don't store that info well. I think maybe I got some corrupted sectors on my hard drive or sumpin.

I'd probably run about a 2" pipe back as it probably has a 1.75" on it now. 
I doubt you will see much benefit by larger stuff, noise maybe.

Don't take my word for it though as i don't have areal clue as to what would help that old design breathe!

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
" I realize that death is inevitable.
I just don't want to be around when it happens! "

 -------------- Original message ----------------------
From: Tom Jennings <tomj@xxxxxxx>
> OK, the exhaust in my American is pretty much 100% iron oxide now, so it 
> get's a new poop chute next month.
> 
> Though it's a typical 3-into-1 iron manifold (two cyls per exhaust port) 
> it seems less restrictive and less angular than the later six (OK the 
> exh ports in the head run nearly 90 degrees...)
> 
> Question: is there any likely scavenging benefit possible from running 
> something like 48" of skinny pipe (like 1.75") down from the manifold, 
> then dump into larger 2" - 2.25") from muffler to tailpipe? Keep in mind 
> this is a small engine that spends most of it's time 2000 - 2800 rpm 
> (hence the 48" number).
> 
> Or should I just run "as large as I can get" (say 2.25") from end to end 
> with a good muffler? I'll mailorder one from Summit or somewhere.
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