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Old 06-22-2009, 06:03 PM
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Ideas for bending exhaust pipe

Hello. I am getting ready to put my exhaust on my 81 El Camino. Has anyone tried bending 2 1/2" exhuast pipe with something made at home. I am trying to make my own custom exhaust. I was thinking about putting sand in the pipe and cutting a piece of wood in the shape of a half moon to bend it.
Does anyone have any other ideas?
Rob D.

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Old 06-22-2009, 06:46 PM
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In a word, NO, you are not going to be able to pull it off. Buy prebent U bends and cut and match is the easyest way.

Brian
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Old 06-22-2009, 07:02 PM
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For all the effort that a homebuilt exaust would be you can get nice mandrel bent kits for around $200 from Summit and Jegs. I have the Jegs kit on my 78 Malibu and am quite happy with it considering the low cost.
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Old 06-22-2009, 08:05 PM
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X2 on the Jegs kit. Mandrel bent 2.5" pipe, hangers, clamps and turbo mufflers for $175. They also have 3" at a slightly higher price, and the fit is very good.
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Old 06-22-2009, 10:01 PM
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Yeah, making an exhaust system for a car where systems are available ready made is fighting a loosing battle. If you do want to continue this is what I was talking about with "U" bends. You cut them and rotate them to make the bends you need. My brother did the system in his roadster and it worked out very cool. But again, if you can by a system ready made you are probably going to save money.



Google exhaust U bend and you will get pages of sites.

Brian
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Old 06-22-2009, 11:21 PM
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Surely there is an exhaust shop that would bend your entire exhaust sytem for you. Usually, the pipe used for bending is thicker than the stuff that autoparts or whoever sell. Time you buy the pipe and monkey with it (your time = $$) you won't come out ahead dollar wise. Plus a good exhaust guys pipes will be right, no hanging or don't fir stuff.
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Old 06-23-2009, 06:56 PM
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I don't think I will try bending it myself. I have a set of dynomax headers on the car now. They have according to my dial vernier caliper 1.610" o. d. on the primary tubes. The four primary tubes feed down into the collector. I am not sure what the name of this next piece is, but it is flared on one end(bolts to the header), about four inches long, and is to be welded to the rest of the exhaust system on the other end. This piece that I am talking about has 2.420 i.d. and 2.520 o.d. What size pipe should I make the rest of exhaust system (2.5", 3.0") and where should I put the H pipe and muffler if I want them to end right in front of the rear tire on both sides. Will not be running converters.
Thanks for any and all responses.

Rob D.
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Old 06-23-2009, 09:47 PM
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Quote:
Originally Posted by newdad1
I don't think I will try bending it myself. I have a set of dynomax headers on the car now. They have according to my dial vernier caliper 1.610" o. d. on the primary tubes. The four primary tubes feed down into the collector. I am not sure what the name of this next piece is, but it is flared on one end(bolts to the header), about four inches long, and is to be welded to the rest of the exhaust system on the other end. This piece that I am talking about has 2.420 i.d. and 2.520 o.d. What size pipe should I make the rest of exhaust system (2.5", 3.0") and where should I put the H pipe and muffler if I want them to end right in front of the rear tire on both sides. Will not be running converters.
Thanks for any and all responses.

Rob D.
The piece you are referring to that the rest of the system welds or clamps to is the collector reducer, also known as a street hook-up(Hooker headers term). Yours are for 2.5" OD pipe, and the 2.5" size should be fine for you.

Why dump the exhaust at the axle Jethro-style?, it will resonate badly inside the car and soot up everything under the car, when good mandrel bent kits with tail pipes are cheap and easy to get from Jegs or Summit? These kits are better than average tubing, include everything, and both places have a good selection of H and X type crossover pipes. The crossover should be placed as close to the header collector as is physically possible (Allow for trans removal at a later date)
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Old 06-24-2009, 08:40 AM
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Good point.

Jethro-Style? LOL
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Old 06-24-2009, 08:31 PM
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Have fun getting by the trans crossmember on the drivers side. I have built quite a few crossmembers out of 1 5/8" tubing for the G bodys so they can get real dual exhaust on the car without going under it or bith pipes on the pass. side of the car.
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Old 06-24-2009, 11:24 PM
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Quote:
Originally Posted by Mike H
Have fun getting by the trans crossmember on the drivers side. I have built quite a few crossmembers out of 1 5/8" tubing for the G bodys so they can get real dual exhaust on the car without going under it or bith pipes on the pass. side of the car.
The 64-72 Chevelle crossmember fits these cars very nicely(I've done this) after trimmimg a little length (less than an inch) off each end and redrilling the mounting holes. Bolt it up to the tranny mount then and square it up to see where you need to drill the new holes in the frame. This crossmember has two humps for dual pipes, and I believe the 73-74 Chevelle/Monte Carlo member could also be made to easily fit.
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Old 06-25-2009, 08:02 AM
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You can buy a tube bender at Harbor Freight for like $100 bucks. Just pack with sand and bend away. Real easy.
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Old 06-30-2009, 10:06 PM
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I took mine to a local shop and had them do some bends.. they didn't even charge me.

Problem with this method is if the bends don't turn out perfect it requires tons of trips, or you do what I did, and cut small angles in the pipe with the bandsaw and weld it back together. Simulated bends, I guess

Doesn't look the greatest but whatever, it's just a pickup.
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Old 07-11-2011, 05:45 AM
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hi....this good work .....i have project in my university about study the effect of heat treatment on the spring_back in u bending process and ineed some help about it or any reffernes ...if you have any thing about it can give me
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Old 07-11-2011, 06:40 AM
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pipe bending.

Some of the better equiped shops have a cnc pipe bender, If they have the program to bend your pipes. I saw a U tube a while back on bending pipe. The guy used several layers of duct tape on the end, then got on a ladder and used a wood closet hanger pole and WET sand and packed it in tight then duct tape layers on the top end. He then used the HF pipe bender. 50 plus years ago I tried the packing it with dry sand, and heating with a torch and it didn't work . We were putting twin pipes on a chevy 6. I bought a new stock pipe then made the necessary cuts and welds to have the second pipe fit. easier than building the whole thing with U 's and straights. 40 years ago we did an all nighter in a muffler manufacturing factory in the bad area of detroit. building a new exhaust for the 427 Cobra that won the 2009 optima That exhaust has since been replaced, . I used 1/8 gas welding rods to get the pattern shapes we needed then loaded the pipe and manually bent and rotated the pipes to get all 8 pipes bent.
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