3 into 1 pipe

[ja-moo]

Talk about form over function.........

http://kawasakikhregister.myfastforum.o ... t4985.html" onclick="window.open(this.href);return false;

[tz375]

That's a cutie Moo.

[diablo]

please keep posting, i am getting a free lesson on two stroke engineering, tks.

[diablo]

how does straight cut primary gears make a difference, i know they would make more noise as if you would hear them but, is it something like less friction and more power or something

[ja-moo]

how does straight cut primary gears make a difference, i know they would make more noise as if you would hear them but, is it something like less friction and more power or something

Yes, helical gears have more drag.

[Zunspec4]

Helical primary gears can also put a side load on the crank. Not an issue on a road bike but undesirable on an engine in racing trim.

Cheers Zunspec

[tz375]

Water pump gasket arrived yesterday, so the rebuilt pump is in and the modified pipe is on and ready to go.

It took 3 kicks and the garage started to fill with smoke - even with the doors open and fans blowing up a storm.

The good news is that the pipe is not nearly as noisy as I had feared. It has a large diameter core and quite a small outer tube around the fiberglass packing but it wasn't too bad.

The bad news is probably that it is quieter than expected and I suspect that's a symptom of the pipe being restrictive long before it gets to the muffler section. That would potential mean that it may not be any/much better than the last dyno run. We'll know when I can schedule some dyno time.

If the rear end changes don't make enough of a difference, we'll have to start cutting up header pipes and collectors and getting cones rolled and so on. Of course the risk is still out there that NO 3 into 1 will give me what I'm looking for. That risk we understand but there's only one way to find out and that's to try a few things.

[Herman T]

Richard, Did you post somewhere what the dyno results were for your 3 into 1 pipe? All this talk about 3 into 1's has me itching to get my bike running sooner so I can find out if my exhaust is like all the others. Probably is.

[tz375]

The water (glycol) seems to be staying inside now and that's an improvement. SMoke is being created in copious quantities again though

http://www.youtube.com/embed/6L6N_MYfuNY

I'll need to re-size it I think.

[Craig380]

@ TZ - sounds sweet, has the tailpipe been lengthened?

On a tangent, I watched a vid of Kim Newcombe's mechanic talking about the work they did on the Koenig-engined solo. They'd rigged up and tested a mechanism that would alter the length of the chambers, like a primitive version of Honda's ATAC system. The "belly" section of the chamber was made of two tubes, one inside the other and spring-loaded. As the rider opened the throttle, a pulley system pulled the end cone and shortened the pipe. It worked, but made the twistgrip action too heavy to use.

[Suzukidave]

Looks and sounds great Richard , if you should put the Jemco's back for a test could you take a video or picture for us to see

[diablo]

sounds alot like an old polaris triple, sounds very nice, would you sell that pipe

[Blokhead]

[On a tangent, I watched a vid of Kim Newcombe's mechanic talking about the work they did on the Koenig-engined solo. They'd rigged up and tested a mechanism that would alter the length of the chambers, like a primitive version of Honda's ATAC system. The "belly" section of the chamber was made of two tubes, one inside the other and spring-loaded. As the rider opened the throttle, a pulley system pulled the end cone and shortened the pipe. It worked, but made the twistgrip action too heavy to use.[/quote]


Racing karts used to run "slippy pipes". The center section was made of two telescoping sections that you could slide in, and out to change the tuned length depending on your location on the track. It had a separate lever that you pushed to lengthen the pipe coming out of the corners, and you pulled it back to shorten the pipe heading down the straights. I believe they've been outlawed for a long time.

[tz375]

@ TZ - sounds sweet, has the tailpipe been lengthened?

Not exactly. What I did was to cut the end off and removed the internal tubes which appeared to hinder the process. Then I fabricated a new end cone and welded it on and then I fabricated an internal stinger with integral straight through perforated muffler, and welded the old tail pipes back on as the muffler outer tube. It was stuffed with high quality muffler packing and assembled.

That simply addressed one of the perceived design shortcomings and it remains to be seen if it was critical or not. It didn't address two other design aspects that we believe are an issue with that pipe, but to change them means throwing it out and starting again. At that point it would be available for sale..

Until it goes back on a dyno we have no idea how much difference it makes - if any. The noise level isn't much louder but throttle response is much faster and cleaner and the note is a little edgier. If it works, great, and if not I learned something so it's all good.

Dave,
I'll see if I can dig out a video of the JEMCO pipes on the dyno. No. On second thought, you will want them back. Just take my word, they sounded terrible. You would hate to have them on your bike..

[Herman T]

Sounds great!! I can imagine the bike in the driveway doing a burnout. Sound and all. Very interesting reading.