alternative exhausts Not sidepipes.

[Ford & Jeep Fan]

I have an idea from left field, maybe far out in left field.

I'm asking in the roadster section because this is largely a roadster issue.

I love the look and sound of side-pipes, but as I get older and slightly less agile Contact with them is not the badge of honor I want and its more likely with age.

The idea is this with the ground clearance and space for muffler of any kind being hard to find,

Why not Run the Exhaust Down the 4 inch Chassis tubes either with a 3 inch pipe inside or not, with some kind of muffler (think header insert) to get the exhaust past

the back of the seats??? OR is the heat of the exh going to kill the steel chassis tubes strength in time??

[Jeff Kleiner]

Using the 4" tubes as an exhaust pipe wouldn't work due to condensation...every gallon of gasoline burned produces one gallon of water.

Jeff

[Windsor]

Using the 4" tubes as an exhaust pipe wouldn't work due to condensation...every gallon of gasoline burned produces one gallon of water.

Jeff

I don't think that ratio is 1:1, otherwise I agree -- a lot of condensate on the inside of the exhaust system during normal operation.

[JohnK]

I've always wondered about using the 4" tubes as an exhaust path for a rear exhaust. Not using the frame tubes themselves as the exhaust pipes, but running a SS exhaust pipe (wrapped in some sort of fiberglass insulator to keep it from rattling around) through the 4" tubes seems like it would be a good path to get from front to back. You'd need to figure out the entry/exit points but in the grand scheme of crazy things that I've seen people on the forum engineer and fabricate, that doesn't seem all that complicated.

[Jeff Kleiner]

I don't think that ratio is 1:1, otherwise I agree -- a lot of condensate on the inside of the exhaust system during normal operation.

You’re right Rob, it’s not 1:1. It’s 1:1.05…and my old professor would be so pleased to know that I have somehow retained this for 40 years! :)

Jeff

[John4337]

Off the shelf parts, 20,000 + miles, no issues.

184391

[Windsor]

You’re right Rob, it’s not 1:1. It’s 1:1.05…and my old professor would be so pleased to know that I have somehow retained this for 40 years! :)

Jeff

Color me surprised, you are correct.

I learned something today!

[facultyofmusic]

Off the shelf parts, 20,000 + miles, no issues.

184391

cool! got pictures of how you routed it?

[MB750]

cool! got pictures of how you routed it?

I asked him the same question a few months ago. Great pics right here:

https://thefactoryfiveforum.com/showthread.php?42819-another-REAR-EXIT-exhaust-inquiry&p=491627&viewfull=1#post491627

[J R Jones]

Another:
https://thefactoryfiveforum.com/showthread.php?45010-quot-Street-Roadster-For-Sale

Same color!
jim

[j.miller]

Just spit balling......How about stacks running up behind the rear tire coming through the outer rollbar holes. Maybe some oil injectors so you can roll coal !....I didn;t write this.....I didn't.......I WAS HACKED !!!!! You can tell because I....DON'T USE SEMI COLONS....;......dang it ! ): Tab ad

[PG_Cobra]

I've always wondered about using the 4" tubes as an exhaust path for a rear exhaust. Not using the frame tubes themselves as the exhaust pipes, but running a SS exhaust pipe (wrapped in some sort of fiberglass insulator to keep it from rattling around) through the 4" tubes seems like it would be a good path to get from front to back. You'd need to figure out the entry/exit points but in the grand scheme of crazy things that I've seen people on the forum engineer and fabricate, that doesn't seem all that complicated.

Following on this suggestion you could insert a flexpipe with the fiberglass wrapping. It would allow an angled access into the frame. The wrap would also constrain the heat and stop the frame heating up

[rich grsc]

Just spit balling......How about stacks running up behind the rear tire coming through the outer rollbar holes. Maybe some oil injectors so you can roll coal !....I didn;t write this.....I didn't.......I WAS HACKED !!!!! You can tell because I....DON'T USE SEMI COLONS....;......dang it ! ): Tab ad
I like thinking outside the box--------of wine ;)

[FDLWproject]

Hotrod Brothers Customs did short side pipes on one of their custom cobras that I liked a lot. I’m not able to upload the photo for some reason, but check out the pictures near the bottom of their gallery here.

https://www.hotrodbrotherscustoms.com/projects-7

[John4337]

Hotrod Brothers Customs did short side pipes on one of their custom cobras that I liked a lot. I’m not able to upload the photo for some reason, but check out the pictures near the bottom of their gallery here.

https://www.hotrodbrotherscustoms.com/projects-7

This one? Wow

184467

[J R Jones]

PG_C, Yours is an interesting idea and brings to mind the sixties Olds 442 which ran chambered exhaust pipes rather than mufflers. One could make inserts of various types to slide in rear access ports in the frame. That would be almost infinitely tunable for noise and restriction. My experience has been that restriction concentrates heat transfer so baffles could make the frame hotter. Now it gets more complicated with water cooled frame tubes and baffle inserts.
Consider that Japanese motorcycles have run inner and outer tubes for primaries to avoid bluing of the chrome.
jim

[Jeff Kleiner]

[QUOTE=J R Jones;526186]...One could make inserts of various types to slide in rear access ports in the frame...[ /QUOTE]

There is a vertical structural 2"x3" rectangular member that passes all the way through the 4" round tube a few inches forward from the rear which would not allow the exhaust to exit straight out the back of the frame tube.

Jeff

[JohnK]

[QUOTE=J R Jones;526186]...One could make inserts of various types to slide in rear access ports in the frame...[ /QUOTE]

There is a vertical structural 2"x3" rectangular member that passes all the way through the 4" round tube a few inches forward from the rear which would not allow the exhaust to exit straight out the back of the frame tube.

Jeff

I've always wondered about the purpose of those. Are they supposed to be jacking points? If so, why aren't there similar ones at the front?

[Jeff Kleiner]

[QUOTE=Jeff Kleiner;526196]

I've always wondered about the purpose of those. Are they supposed to be jacking points? If so, why aren't there similar ones at the front?

That rectangular tube goes up and then joins the rear portion of the chassis which makes up the trunk floor, rear coilover mounts (and upper control arm mounts for IRS) and basically everything aft of the cockpit. That connection is infinitely stronger by passing through the 4" round tube and being welded top and bottom than it would be if it were only stuck on top of the round tube. Although not actually designed as a jacking point it works well for that.

Jeff