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Post by cootersandwich on Feb 16, 2011 2:00:32 GMT -5
I'm thinking about doing this to my pipes....would I have to re-jet in order to make it run cleanly? What sizes should I go to if so and what are some reasons why I shouldn't chop them like this. Attachments:
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Post by pamcopete on Feb 16, 2011 6:27:44 GMT -5
cooter...., The shock waves from the exhaust will be so strong that they will permanently damage your ears.  The high level of carbon monoxide from the exhaust will poison your brain, starting with a huge headache....  Of course, in this crazy world, not being able to hear or think may be a blessing....  |
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plattey
Full Member
1982 xs650sj
Posts: 233
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Post by plattey on Feb 16, 2011 9:28:06 GMT -5
cooter...., The shock waves from the exhaust will be so strong that they will permanently damage your ears. The high level of carbon monoxide from the exhaust will poison your brain, starting with a huge headache.... Of course, in this crazy world, not being able to hear or think may be a blessing.... that's hilarious ;D Yes, you will have to rejet. But the engine will not perform as well as it did before. Expect a noticeable loss in torque in the midrange rpm. |
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Post by grizld1 on Feb 16, 2011 10:20:49 GMT -5
He can expect a noticeable loss of power through the entire range, plattey! Contrary to popular belief, cooter, more noise does not produce more go. Pipes that short will put the power peak up past what the motor can turn. The pipes in the photo look to have 1-3/4" OD (in 16 ga., 1-5/8" ID), which moves the torque peak up where you can't reach it as well--worst possible combination.
I think you've turned a classic trio into a quartet, Pete--"Think no evil." Do you have a concept for how Monkey #4 should look?
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Post by tomterrific on Feb 17, 2011 7:48:46 GMT -5
Yes, but if the pipes are cut off so they point straight down, he could do wheelies just by reving the engine.
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Post by cootersandwich on Feb 17, 2011 21:20:42 GMT -5
I dunno if any of you have seen "Wizard Sleeze" by Ardcore Choppers...he has the shorty ones on there and idk it looks good and sounds pretty good. If it's going to cause damage to the engine I won't do it. I guess I just wanted to modify my pipes to be different.
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plattey
Full Member
1982 xs650sj
Posts: 233
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Post by plattey on Feb 17, 2011 23:50:44 GMT -5
Cooter, I've got an '82 special and I chopped off the mufflers at the weld joint and had pipe extensions welded on. They sounded great and throaty but there was loss in the midrange until redline. It felt like it pulled better near redline, but maybe that's just the extra noise that makes it seem faster ;D Here's a picture of it with the pipes: imageshack.us/photo/my-images/291/gedc1876.jpg/Heck, when I first tried out these pipes, I went for a ride and ended up passing a husband and wife on their harley twice (just coincidental) and the second time we passed each other, the pipes on the 650 were so loud the wife on the back covered her ears as I went by ;D I made baffles after that incident lol |
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Post by xsleo on Feb 19, 2011 15:26:11 GMT -5
The short fat pipes may not hurt the engine just how well it runs. If you ride it much in cool weather, less than 85 degrees the rush of cool air back up the pipes and hitting the valves can warp the valves.
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Post by cootersandwich on Feb 22, 2011 1:05:06 GMT -5
Plattey, those are some good looking pipes. Mine look nearly identical only mine are maybe 6" shorter and have 4" baffles.
I like the whole short turn down exhaust look and was thinking about doing it to mine only because I already have the pipes, pretty simple. Plus, I don't want to put too much money into a bike that doesn't have a huge resale value....
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The high level of carbon monoxide from the exhaust will poison your brain, starting with a huge headache.... 
