CB360 Exhaust Question

[hecklejk]

Hey guys, got a question about my ideas for my new exhaust setup...
Here is the plan, I want to cut the stock headers down so I have them to build off of. I want to mount them at an inward sloping angle, have them cross in the middle and then run the pipes down each side of the bike like CL pipes..

My question is, will having the exhuast flow from both cylinders crossing cause me any problems???

Thansk guys,
Kevin

 

[Hot Rod Troy]

It shouldn't. There are bike out there that run crosover pipes on them. It just depends on how smooth the flow is. Hopefully there is somebody here that knows better.

 

[hecklejk]

It shouldn't. There are bike out there that run crosover pipes on them. It just depends on how smooth the flow is. Hopefully there is somebody here that knows better.

Word... thanks for the response. I think that the crossover would look alot cooler that just bending some pipe and running them down each side of the bike..

 

[crazypj]

It should work like the 'X' pipe on a V-8.
The exhaust gas doesn't care, it will take path of least resistance.
If 'X' is in correct place you should get a torque benefit but may loose power everywhere, ('tuned' length puts powerband at unattainable rpm)

PJ

 

[Rocan]

It should work like the 'X' pipe on a V-8.
The exhaust gas doesn't care, it will take path of least resistance.
If 'X' is in correct place you should get a torque benefit but may loose power everywhere, ('tuned' length puts powerband at unattainable rpm)

PJ

couldnt you just make the pipe length after the x pipe longer or shorter to compensate for the loss?

some v8's see only a gain with the x pipe over straight pipes... im really interested in the math behind this one.

 

[Flash]

I'm interested in this too. The 2-1-2 setup of the proportions proposed worked well for every Ducati I've owned but the firing intervals are different to a parallel twin.

 

[crazypj]

Don't need math for what's being described, the primary pipes will be 10"~14" which will give a boost in the 15~20,000 rpm range. CB360 just won't go there

PJ

 

[Flash]

Yeah, I knew that. I was just pretending I didn't have a clue...





Okay, I haven't got a clue. How did you work that out?

 

[Rocan]

Don't need math for what's being described, the primary pipes will be 10"~14" which will give a boost in the 15~20,000 rpm range. CB360 just won't go there

PJ

thats if you put the x pipe at 10-14 inches, no? what if you were to place the x pipe directly before the output, or at least so that the primary pipe is at 20"

 

[crazypj]

I want to cut the stock headers down so I have them to build off of. I want to mount them at an inward sloping angle, have them cross in the middle and then run the pipes down each side of the bike like CL pipes..

Kevin

They have to cross high to run like CL pipes, X pipe at end wouldn't be what he want's to do

 

[hecklejk]

So if I am to understand everyone correctly, I should be able to go ahead with the X crossing of my exhaust without any issues correct???

Thanks guys,
Kevin

 

[Big R]

I'll admit that I don't understand the science of it, but what about running the exhaust back on each side and have the X pipe where the battery tray would be? Sure would look different

 

[hecklejk]

I'll admit that I don't understand the science of it, but what about running the exhaust back on each side and have the X pipe where the battery tray would be? Sure would look different

I could do that without any issues... However, I am not moving the battery so it wouldn't work out for me!! I like the idea though!!!

 

[Wee Todd]

Flasher hit the nail on the head,,,2 into one into to 2,,,,,that was the hot set up for a Norton in the late 70's(researched by a university???? harmonics??),,Norton 360 degree,...... ducati 90 degree...honda lump 180 degree.....two into ones don't work well with 180 degree firing order,,,,,single pipes make more power

 

[hecklejk]

Flasher hit the nail on the head,,,2 into one into to 2,,,,,that was the hot set up for a Norton in the late 70's(researched by a university???? harmonics??),,Norton 360 degree,...... ducati 90 degree...honda lump 180 degree.....two into ones don't work well with 180 degree firing order,,,,,single pipes make more power

So that being said, can I run the crossover pipes or should I just go ahead and run single pipes?? Thanks

 

[Wee Todd]

Your going to race it at Barber!!!,,,Jam on a header if you can find one(hard to find) run singles,,,,,,,,,you don't need a crossover pipe on these bikes......unless you want to make it look British,,,,,and a huge pain in the ass to remove the exhaust system.......cross over was installed on 360 degree engines to enhance low range torque.......did shit for high speed performance