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Post by fenz on Feb 23, 2008 2:50:43 GMT -5
I am going to buy mandrell bends to make a pipe for my track bike and was looking at 1 3/4" pipe.
I think this is the right size for a modded motor????it will be down swept into a reverse meg.
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Post by frankyb on Feb 23, 2008 18:13:04 GMT -5
Hi fenz, from memory 1 5/8" is a port match. Start with that size, and get the pipe guy to expand the end to 1 3/4 and go from there. Basic extractor. Cheers Franky b.
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Jun 29, 2008 16:39:13 GMT -5
Hi fenz, from memory 1 5/8" is a port match. Start with that size, and get the pipe guy to expand the end to 1 3/4 and go from there. Basic extractor. Tubing is sold based on OD. 1.75" tube with a .049" wall has an ID of 1.652" and with a .063" wall ID is 1.624" (1 5/8 = 1.625"). To the best of my knowledge all aftermarket pipes for the Yamaha 500 series are based on 1.75" head tubes. I have a spread sheet set up using calculations provided Circle Track magazine for designing headers that shows the peak torque range for a given header design. A pipe made from 1.625 x .049' tube will produce peak torque at about 4600 rpm based on a 36" long pipe. The same design using 1.750" tube produces peak torque at about 5500 rpm. All else being equal, the longer the pipe the lower the peak torque rpm and vice versa. Good luck. PC |
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Post by caferacercarl on Jul 12, 2008 18:33:40 GMT -5
Please see the other thread on headers etc, both 2 inch and 1 3/4 inch are already made and waiting for all of us.
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