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Exhaust Sizing calculations
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Source：Internet Author：Unknow Pubdate：2010-06-26
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Korichnevijgigant (Aerospace)
24 Jun 10 13:38
I am trying to get some help in sizing my exhaust pipe for my 1997 Pontiac Trans Am WS-6
Can anybody point me in the right direction for equations?
I pulled out my Marks handbook hoping it would help, but I couldnt find anything
Currently, I have long tube headers with a 1.75 inch primaries 3 inch collectors then going into a 2.5 inch y-pipe that has 3 inch cut-outs which then has regular catalytic converters then into a 3" Flowmaster catback.
I want to redo the y-pipe because it was cheaply made (in college)
I eventually want to go to a true dual exhaust system.
If you could please help me out I would appreciate it
Attached is a thread I posted on another forum
- http://ltxtech.com/forums/showthread.php?12321-Exhaust-advice.-2.5-or-3
NormPeterson (Structural)
25 Jun 10 10:22
字串5
You may be able to find something under "gas flow in pipes" in various piping references (the Piping Design and Engineering book by ITT Grinnell did - an older piping guy may still have a copy).
I doubt you'll need more than 2.5" for a street 5.7-ish liter motor anywhere but through the converters. The SBC I have in one of the cars is a little more serious than yours and doesn't.
Strictly speaking, an X-pipe system isn't "true duals". An "X" has some advantages especially if the mufflers themselves are somewhat restrictive (Flows not necessarily being all that great in this respect). It certainly won't sound the same even if the rest of the piping and the mufflers are identical.
Norm
Korichnevijgigant (Aerospace)
25 Jun 10 10:30
NORM!
well they call it true duals because the Trans Am (and Camaros) have a y-pipe after the manifolds and then a single pipe leading to the muffler then it has 2 outlets, so you get the appearance of dual exhaust, but its not true, hence the name. 字串8
Anyways, I have been doing so leg work trying to get to the answer eventually, right now I am working on the exhaust flow rate out of the valve. I want to get the flow rate out and the pressure that its at, so I can get the optimal flow area ratio so I dont have choked flow, because I think Im gonna reach sonic flow out of the valve.
Well thanks for the help.
thundair (Aerospace)
25 Jun 10 16:07
http://www.maxracesoftware.com/pipemax36xp2.htm
This will work its easier then reading the same page over and over.
Cheers I don't know anything but the people that do.
Korichnevijgigant (Aerospace)
25 Jun 10 17:17
Great thanks
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