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Old 01-09-2017, 07:03 PM
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Oval a small section of exhaust?

Need to oval a small (lets say 4 to 5 inches) of exhaust pipe under a car because its hitting a subframe brace.
I can pull the brace to do the work but it's a 1 piece exhaust so pulling it isn't on the list.

Dont want to just hit it with a hammer.
Whats a good way to do this?
Clamp?

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Old 01-09-2017, 09:26 PM
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buy an oval pipe and cut and weld
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Old 01-09-2017, 09:30 PM
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Quote:
Originally Posted by vinniekq2 View Post
buy an oval pipe and cut and weld
Just trying to bend it oval for now. Car will get full exhaust hopefully summer time.
Just trying to figure a way without crushing or puncturing current exhaust
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Old 01-09-2017, 10:15 PM
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Make a clamp with 2 pieces of flat bar and a couple of bolts. Attach to pipe and tighten the he&& ut of it. That will crush the pipe.

Sam
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I have tried most all of it and now do what is known to work..
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Old 01-09-2017, 10:19 PM
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Originally Posted by OneMoreTime View Post
Make a clamp with 2 pieces of flat bar and a couple of bolts. Attach to pipe and tighten the he&& ut of it. That will crush the pipe.

Sam
This sounds doable thanks.

I was thinking clamp of some sort but hadn't thought of this.
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Old 01-10-2017, 08:53 PM
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Turns out this pipe is harder than expected. I actualy did try 2x4 and floor jack and actualy lifted the car off the stands and just a small dent in the pipe.

Tried a c clamp and it bent; the c clamp.

Im mad now its getting the hammer over the weekend.

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Old 01-10-2017, 08:55 PM
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heat t up cherry red, and punch it
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Old 01-10-2017, 08:57 PM
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Quote:
Originally Posted by hotrod389 View Post
heat t up cherry red, and punch it
Thats along the lines i was thinking.
Heat the area and hit it with a bfh
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Old 01-10-2017, 09:37 PM
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Quote:
Originally Posted by toos10w View Post
Thats along the lines i was thinking.
Heat the area and hit it with a bfh
whats BFH for?
you can vice that no problem,
If you wanna get all redneck with it, heat it up on the top only and use a jack
with the exhaust installed.


stay away from the muffler bearings tho, they don't like heat.
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Old 01-10-2017, 09:53 PM
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Quote:
Originally Posted by hotrod389 View Post
whats BFH for?
you can vice that no problem,
If you wanna get all redneck with it, heat it up on the top only and use a jack
with the exhaust installed.


stay away from the muffler bearings tho, they don't like heat.
Lol dont have an oa just propane so doubt I'll get it hot enough to just vice it.
Yeah muffler bearings are far enough down stream thats no problem.

Btw the exhaust is above the subframe brace.

I'll get it figured out this weekend and if not I'll try getting exhaust sooner
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Old 01-10-2017, 10:10 PM
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Quote:
Originally Posted by hcompton View Post
Ok go back to plan A with a real C clamp not one you got for 99 cents. Get an old one made from tool steel or new one made to actually last. They should be able to bend exhaust pipe. And have a rod that is thick enough not to bend. All else fails the big vise is the only option other than welding in a new oval section.

Ask an old person if they have a C clamp that thats a good heavy duty one. The bigger the better makes it easier to flatten the pipe with less effort.
Yeah the big c clamp from sears is junk bent and didnt do much to exhaust pipe. Tho I'm wondering why i was able to jack the car up with the exhaust and only made a tiny dent.
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Old 01-10-2017, 11:07 PM
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Quote:
Originally Posted by hcompton View Post
What kind of car. Some of the fwd cars now a days have almost no weight in the back.
Now theres a fun question.
Its a 92 cavalier so maybe 2700lb car.
The subframe brace is at the front of the car so its where most of the weight is.

Cars hopefully getting a motor swap in the summer along with new exhaust but don't want to kill what is on it too bad before then.
Going to get new exhaust tho even if it keeps the old motor tho.
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Old 01-10-2017, 11:14 PM
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Quote:
Originally Posted by toos10w View Post
..... Tho I'm wondering why i was able to jack the car up with the exhaust and only made a tiny dent.
Exhaust tubing is a lot stronger than it looks, even a big C-clamp is going to have trouble. that pipe is twice the thickness of even the sheetmetal a uni-body car is made out of...and you can lift a uni-body car from its jack points under the subframe without bending them.

Heating the pipe redhot is the only way you'll get a smooth depression short of an exhaust bender.
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Old 01-10-2017, 11:16 PM
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Going to see how hot i can get the pipe with both my propane torches going at the same time.
Hoping hot enough to be able to bent that pipe

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Old 01-11-2017, 06:50 AM
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Quote:
Originally Posted by ericnova72 View Post
Exhaust tubing is a lot stronger than it looks, even a big C-clamp is going to have trouble. that pipe is twice the thickness of even the sheetmetal a uni-body car is made out of...and you can lift a uni-body car from its jack points under the subframe without bending them.

Heating the pipe redhot is the only way you'll get a smooth depression short of an exhaust bender.
Real old-timers used to build dune-buggies and doodlebugs out of "Muffler Moly" which was thick-walled exhaust pipe. NO! I don't recommend it!!! DON'T do it!
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