modding y pipe length ?

[assault 700]

a friend of mine thinks i can change the length in my y pipe about 1 inch with out hurting the performance of the pipe dose any body have any info on these thanks

 

[sled_guy]

Your friend is wrong. 1" is a LOT.

Back in like 2000 SLP offered a shim to go in the 800 pipe between the pipe and the y-pipe that was about 1/4" long. At higher altitudes it made a big difference.

With the 07 700RMK when Carl's Cycle ported one you could put a 1/4" spacer in between the y-pipe and pipe and pick up a couple of sled lengths.

So changing it 1" is going to have a big affect.

sled_guy

 

[assault 700]

do you know what it changes when you make the y pipe longer

 

[theultrarider]

Why are you wanting to do so? Transplanting an engine into a different sled or just try to find more power?

 

[assault 700]

different body

 

[assault 700]

???

 

[mike_s]

I wouldnt change the y-pipe length, as it will change the overal length of the tuned pipe, and change the response of the wave action inside the pipe. Lengthening the total length will cause the pipe to respond at a lower RPM range, and an inch is a considerable amount in pipe tuning terms. I would do whatever you can think of without changing the length of the system. Perhaps a set of twins (tripples? What engine are you speaking of? LOL!), that way you could just straighten the bend in the divergent section of the pipe and gain the length you need for clearance without changing overall length of the pipe.