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Antique Gas Engine Discussion

Bending Copper Pipe


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  #1  
Old 05-22-2005, 02:04:50 PM
Bill Sommers Bill Sommers is offline
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Question Bending Copper Pipe

I have a Cushman Binder engine with a screen cooling tank. It has coper pipe from the engine to the screen with all kinds of elbows and 45s. I would like to bend a piece of copper pipe to a 360 aof about 12" diameter. Can any one tell me how to bend copper pipe and make it look good and not kink?
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Old 05-22-2005, 03:41:31 PM
Harry Harry is offline
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Default Re: Bending Copper Pipe

I thought that we had covered this before, but it was "how to straighten copper pipe." Maybe you can get some hints from that thread, otherwise a tubing bender or maybe fill the pipe with sand. It becomes even more fun when working with brass pipe.
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Old 05-22-2005, 03:43:44 PM
Richard H. Gambrell Richard H. Gambrell is offline
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Default Re: Bending Copper Pipe

Take a v belt pulley about the size of your intended bend and lay the pipe in it to bend. Will not kink.
Richard
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Old 05-22-2005, 06:44:28 PM
Jim Tremble Jim Tremble is offline
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Default Re: Bending Copper Pipe

Heat the copper to a straw orange color and then put it into cold water until cold. You now have a soft copper to work with. It will be much easier to bend.

The V belt pulley idea is a good one.

Jim
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Old 05-22-2005, 08:01:03 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Bending Copper Pipe

You can put some fittings on the end of the copper, install a grease fitting on one end and a plug on the other, fill it with oil and pressure it with a grease gun, works better than sand.
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Old 05-22-2005, 09:25:51 PM
Jim L. Brown Jim L. Brown is offline
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Default Re: Bending Copper Pipe

Greetings! Sounds like you have gotten lots of good suggestions - but I have a more basic question: Is it just a personal preference that you want to bend and use copper pipe? Originally these engines used rubber hose to connect the water cooling system from the engine to the cooling cone and tank. It certainly is much easier to work with and more authentic. Just a thought. Jim
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Old 05-23-2005, 09:16:45 AM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Bending Copper Pipe

J.B. Thanks for the pressurized oil/grease gun trick. I will remember that one.
My guess is you would use compression or flare fittings and just cut off the extra length when you are done. I wonder how much pressure it would take to blow a fitting off like a rifle bullet? Kevin
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Old 05-23-2005, 11:53:11 AM
Harry Harry is offline
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Default Re: Bending Copper Pipe

Quote:
Originally Posted by Kevin O. Pulver
I wonder how much pressure it would take to blow a fitting off like a rifle bullet?
I would be more concerned about pressurizing anything with air rather than a liquid. I don't think grease or oil would go far, but couple that with compressed air and you have a problem! The reason is that liquids do not expand much when released, but a volume of air is another story.
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Old 05-23-2005, 01:04:01 PM
Bill Sommers Bill Sommers is offline
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Smile Re: Bending Copper Pipe

Thanks for the replys. I tried the sand inside the pipe and bending over a v pulley. I got a kink the first time and it just broke off the second try. I want to use copper instead of hose because you can shine it up and it looks good. I think my only choice now is to heat it. I might also try to find some 3/4 copper tubeing.

Bill
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Old 05-23-2005, 01:12:08 PM
Mac Leod Mac Leod is offline
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Default Re: Bending Copper Pipe

I saw on tee-vee, when they make trumpets, they freeze the pipe with h2o in it, will not kink...may try that

Mac Leod
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Old 05-23-2005, 01:46:13 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Bending Copper Pipe

With grease and oil you have pressre but no compression, if you pump until the fitting comes off it will just fall off.
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