Exhaust Pipe Routing - Need Pics - AMC360

rollbar

I would like to see some pics so I can get an idea of how I want to run my exhaust. I either want to run outside, or, inside. If I run inside, I would like to put two collectors on so I can take the center out from the manifold to the muffler for room to work if needed (just an idea). Thanks, Jim

tufcj

Mine is custom to avoid crushing the "Y" pipe. It's 2 1/4" (matches the manifold outlets) to where the pipes join, then 3" out the back. I have to run a cat because of emissions laws. Factory manifolds (again, emissions), the passenger side turns forward, then under the front of the pan before turning rearward.

Bob
tufcj

rollbar

Thanks Bob, so the factory outlet is 2 1/4". We don't have the emission law in this town so I'm not going to run cats, I do want to run some dumps from Summit. I also am not going to run a crossover pipe.

Any cons on running the dumps?

http://www.summitracing.com/parts/MRG-5424

tufcj

No problem with dumps. All you may get is LOUD. I noticed a nice gain in low end torque when I went from headers/glasspacks to the single 3" exhaust. It does lose a little top end with the single exhaust (that's where the dumps may help) but I seldom rev it over 4000. Besides, I guess I got old, it just wasn't fun to have my ears ring for a couple of hours after driving the Jeep. I like to hear the radio and CB when I go down the road now. Bob tufcj

rollbar

Ya, I had glasspacks on my '79 frame up.

I have been driving Jeeps since I was a early teen w/the Willy's and all these years my ears ring e/the canvas/no top.

I am going to use stock mufflers so I can hear 🙂 & have the dumps at hand so when a punk kid in a rice burner pulls up I can smile and just open them up 🙂

I've been use to the 258/304 so the 360 will be plenty in any state. Should be fun.

Thanks Bob

rollbar

Bob, what is the opening for the stock exhaust 2 1/4"?

tufcj

Boy, that manifold looks pretty rusty! Maybe just the pic. Factory outlet is 2 1/4". There was a heat riser on the passenger side. I deleted mine and used shorter studs to help with the turn forward. There is a donut gasket that slides into the manifold, the end of the pipe is flared outward, and there's a piece that slides around the pipe to catch the studs and the flare and pull it together. I got some all aluminum donuts at NAPA, stock were a pressed material (asbestos maybe?) Bob tufcj

rollbar

Yep cleaned it up w/a wire brush on a drill but now that I have a glass bead cabinet I still won't take it off :) I have some donuts (aluminum looks like/bluish in color) a friend gave me (new) and I to am not going to use the heat riser. Thanks Bob, 2 1/4" it will be.

rollbar

Exhaust routing planning:

http://www.youtube.com/watch?v=-1V4J9DYr64

[video=youtube;-1V4J9DYr64]http://www.youtube.com/watch?v=-1V4J9DYr64[/video]

tufcj

The drivers side will torque upward, you'll have to plan your clearances accordingly. You want it to "float" since the engine moves some on the mounts. The only other thing I can think of is that if you curve the exhaust upward, it gives condensation a place to puddle when it cools, and could start rust from the inside. I don't know how much you'll rock crawl with it, but putting mufflers outside the frame rails leaves them exposed to be crushed. That's part of why I went to a single 3". We did a V6 CJ in a similar way outside the frame, even ran the tailpipes up over the back tires inside the fender wells, so it can be done. Bob tufcj

rollbar

That's right Bob, I didn't think of the torque. No rock crawling for me but then again I use to live in Fla = mud, now in NV = rocks. To many questions to decide but I'm not worried about the condensation, nothing rusts out here and it is dry enough to blow out etc I would think. Still thinking of inside w/the collector set up.

rollbar

rollbar;130021 wrote
Thanks Bob, so the factory outlet is 2 1/4". We don't have the emission law in this town so I'm not going to run cats, I do want to run some dumps from Summit. I also am not going to run a crossover pipe.

Any cons on running the dumps?

http://www.summitracing.com/parts/MRG-5424

I went to Summit yesterday and the desk rep said these dumps don't seal that well after a while.

Does anyone know of some that do, if not then I'm gonna run the system quiet and make it a sleeper some what hahaha

CJ7HEAVEN

Here are some pics of mine. 3" Pipe. The Flowmasters are being changed to Magnaflow's after my NV4500 Conversion in the next few day's. AMC Power !

CJ7HEAVEN

Sorry. Had to rotate one pic.

CJ7HEAVEN

Drivers side is hanging a little low on one side because I removed it momentarily. I can completely stuff the 35" tire and the typical "U" shape bend over the rear axle wasnt even neccessary.

CJ7HEAVEN

My pride and joy.

rollbar

SWEEEEEEEEEEEEEEEeeeeeeeeeeeeeeeeeeeet, and nice jeep. Someone answer me this please (or is it an old wives tale). I thought or was told you CAN'T run big exhaust on a gas engine because it needs some, back pressure. Meaning, you can't run exhaust like a Diesel. Now, if I can, should I on the 360 go with: 1. 3" 2. 2.5" 3. 2 1/4" Thanks, Jim

CJ7HEAVEN

My guy that built my motor is a long time friend that builds some incredible race car motors. That was what he suggested I run so that was what I went with. I'll ask him tomorrow what his opinion is. My motor makes 407.1 at the crank so I have a few ponies to spare. Lol.

rollbar

CJ7HEAVEN;130328 wrote
My guy that built my motor is a long time friend that builds some incredible race car motors. That was what he suggested I run so that was what I went with. I'll ask him tomorrow what his opinion is. My motor makes 407.1 at the crank so I have a few ponies to spare. Lol.

Any word on the exhaust size, As per post 13 & 17?

rollbar

CJ7HEAVEN;130328 wrote
My guy that built my motor is a long time friend that builds some incredible race car motors. That was what he suggested I run so that was what I went with. I'll ask him tomorrow what his opinion is. My motor makes 407.1 at the crank so I have a few ponies to spare. Lol.

Question, since I am running split exhaust (no cross-over), I'm thinking of a 4cyl on each side if you are w/me. And since then shouldn't I run a 2.25" size exhaust on each side? OR, should I still go w/the 2.5" on each side?

I'm gong to go to Summit next week and get some of these in stead of the cable dumps.

This way I can keep a quiet exhaust and open the up when I want etc.

So, what say YE!

Thanks,
Jim