I am in the process deciding on the exhaust for the 79 C-10 LS swap. I have these headers:
Announcement
Collapse
No announcement yet.
Exhaust System Size - 2 1/4" or 2 1/2"?
Collapse
X
-
Exhaust System Size - 2 1/4" or 2 1/2"?
Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac ProjectTags: None
-
Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
-
The header collectors exit at 2 1/2" as do the converters. I'm wondering if I should go with 2 1/4" or 2 1/2" from there back. Please share any thoughts you might have. Thanks,Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
Comment
-
I don't know the details but the engineers I worked with were sitting around BSing (in my test cell control room!) and they claimed that you CAN have too little back pressure. Guessing you could Google that? Not sure that 2 1/2" would cause that. As a practical matter it's probably more dependent on fitting the tubes thru the chassis and you likely have plenty of room.
Dan
Comment
-
This was always a go-to system for my square bodies back then...http://www.heartthrobexhaust.com/1014144.PDF
Patrick & Tammy
- Long Haulin' 2008, 2009, 2010, 2011, 2012, 2014...Addicting isn't it...??
Comment
-
2 1/2 and 2 1/4 tailpipes should be fine. You can go bigger if you want, you probably won't gain anything noticeable. Modern trucks use 3" single exhaust with those engines, eh?
My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
Comment
-
I have 2 1/2" tail pipes all the way with a crossover behind the headers on my '80 Chevy 3/4 ton with 4WD and they fit just fine even with the transfer case. The crossover pipe give you a little more low end torque and quiets the exhaust down some. If I didn't to deal with the transfer case I'd have 3" tailpipes all the way back. The theory of not having enough back pressure on gas engines was proven wrong long ago.
Comment
-
The o/p didn't say, but are the tail pipes going over the axle, or just exiting in front of the rear tires.
The part I never could understand, and never have had my hands on, to look at.
But it looks like those x pipe things, the center of the x is no larger than the pipe. So a 2.5" pipe, two of them, forcing exhaust through the center of the x that is 1/2 the area of the 2 pipes feeding it. Seems to me it be a bottle neck.
But again, I've never had one in my hands to look at. only seen photo's of them. So I might be way off.
Comment
-
Thanks for all the feedback. I'd love to have a custom job done but I have this from the Mustang project and should probably at least try to use these. It's 2 1/4".
Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
- Likes 1
Comment
-
The theory of exhaustion is not only the Hot gases going out, but MORE of the "Sound Wave" that creates a vacuum, also this frequency goes out then immediately races back up the system, and the cycle repeats with each cylinder. Hence the tapered megaphone tail pipes enhance this sound waves. Think about it, what's the theory of all header pipes being the same length. And the "H pipe" is equalizing two 4 cylinder engines in one system.
take a look at some of the High Dollar Indy, Grand Prix cars "Pipe Organ Octopus" systems.
It's free horse power.
Comment
Comment