Gareth
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« on: December 26, 2009, 06:33:45 pm » |
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I am in the process of adapting an expansion chamber to a small 2 stroke engine. What I am trying to find out is what is the tightest diameter that thin wall 3/4 inch steel tubing can be bent to. I need a very tight u-bend to come off the jug and connect into the expansion chamber. I have been having no luck in my searches today. I seem to keep getting 2 3/4 exhaust bends instead of 3/4 that I need. In actuality, I need 170 degrees, but figure 180 to be a standard and I can work with that easilly enough by cutting and welding. I know there are a lot of fab experts here on CLF, so I figured I'd throw it out here in hopes I could get answers and leads. Thanks for any help.
Gary
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Craig Merrow
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« Reply #1 on: December 27, 2009, 12:53:18 pm » |
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We bend a lot of stainless steel and copper tubing at work for the chiller systems we manufacture; the minimum bend radius we have for 3/4" is 3", which means 6" between the centers on a 180-degree bend. Check with some plumbers or plumbing supply places, they might have a tubing bender to do the job.
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« Last Edit: December 27, 2009, 12:54:59 pm by Craig Merrow »
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Iowa Mark
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« Reply #2 on: December 27, 2009, 01:19:59 pm » |
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About the only thing I can think of is to use steel weldable plumbing elbows. McMaster shows 3/4" sc 40 to be at 1-1/2" radius. Copper street "L's" will get you even closer but are a bitch to weld to steel.
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turbotype1
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« Reply #3 on: December 27, 2009, 10:58:02 pm » |
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Pete Paradis
J&P ChassisWerks
Portsmouth,NH
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Gareth
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Posts: 123
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« Reply #4 on: January 01, 2010, 12:00:12 am » |
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Thanks. I'm waiting to here back from woolf. I assume they will get back to me sometime next year. =-)
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bugninva
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« Reply #5 on: January 01, 2010, 01:43:28 am » |
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I assume they will get back to me sometime next year. =-)
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Gareth
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Posts: 123
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« Reply #6 on: January 19, 2010, 10:00:08 pm » |
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Woolf hooked me up. Thanks again. Here is the finished pipe. It's actually 1 inch not 3/4 tubing. 3/4 is the inside diameter. I was thinking in plumbing terms as that was what I used for mockup.   |
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bugninva
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« Reply #7 on: January 20, 2010, 11:42:36 am » |
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I like that better than the AMC you were putt putting around in...<G>
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NoBars
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« Reply #8 on: January 27, 2010, 06:59:41 pm » |
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that looks like a recipe for pain
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Anthony Consorte
Richmond, Va.
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Jim M
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« Reply #9 on: January 28, 2010, 04:06:07 pm » |
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My buddy turned me on to these, checkout the videos... http://www.motopeds.com/ |
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Gareth
Junior
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Posts: 123
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« Reply #10 on: February 11, 2010, 09:27:54 pm » |
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Thoae are sweet. Mine is getting fun. I did a little porting on the jug, just got it back together. Nice little crackle now. I will have a billet head for it soon. I have already shaved the stock head down and bumped the compression up a little...but teh billet head has a proper squish band...the stocker...not so much.
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