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Re: RZ350 Super Motard
Posted: Thu May 10, 2018 5:56 pm
by JanBros
best is to let the baffle end in the stinger with a nozzle, and then go wider again. that way the diemater or length of the stinger has no influence anymore.
Re: RZ350 Super Motard
Posted: Thu May 10, 2018 9:25 pm
by Smoker
That makes it perfectly clear.
Please explain more, Jan.
Re: RZ350 Super Motard
Posted: Fri May 11, 2018 6:48 am
by JanBros
the nozzle is the bit that determines the flow in the stinger. if you make the real stinger about 1.5 times the diameter of the nozzle, anything that happens after the nozzle has no influence. If I make a pipe, I weld on a "stinger" of about 10cm long , about 2 times the diameter of the nozle. I turn the nozzle on the lath (length about 1/3rd of the , slide it in and than stick the real stinger behind it and pull everything together with 2 springs. This way you can take out the nozzle and change it's inner diameter to find the correct size to create the best back-pressure.
I'm certainly not an expert, I just read the right fora like the ESE topic on kiwibiker or the RSA topic on pitlane (the drawing comes from one of them).
based on the knowledge of Frits and Wobbly, I made this pipe-calculator :
http://users.telenet.be/jannemie/FOS%20 ... black.xlsm" onclick="window.open(this.href);return false;
Re: RZ350 Super Motard
Posted: Fri May 11, 2018 10:35 am
by Smoker
Thank you very much, Jan!
Very interesting info. I will study the information, so I understand more about making pipes.
I do understand your explanation about the "nozzle" and stinger diameter. I purchased 16 gauge 1 inch OD tubing for the stingers, but have not used it, yet. I know an excellent pipe manufacturer that uses this tubing for his stingers, so I thought it would be okay. I'll try to figure out the stinger diameter with your pipe info and see if my tubing will be close in diameter.
Re: RZ350 Super Motard
Posted: Fri May 11, 2018 10:40 am
by Smoker
JanBros wrote:best is to let the baffle end in the stinger with a nozzle, and then go wider again. that way the diemater or length of the stinger has no influence anymore.
I cannot view this photo. Maybe it would have made the explanation clear. I do understand now. Thanks, again!
Re: RZ350 Super Motard
Posted: Fri May 11, 2018 10:51 am
by Smoker
MK wrote:Don't use that 90 deg bend at the belly. Looks like moto cross pipes from the 70's.
The radius must be much smoother as the exhaust gas won't like going round sharp corners. Should look like the RSK 500's
https://pbs.twimg.com/media/C3A7PkuXAAEUYJ4?format=jpg" onclick="window.open(this.href);return false;
I was looking for my SXV parts fiche and found your info on how to fabricate a two-stroke exhaust.
I'll read it as soon as I can. I don't think I can fabricate the exhausts myself, but it will help me understand how to design the pipes for this bike.
I'm afraid, because of clearance issues, I may not be able to use an ideal design or shape or size. I may have to design the pipe so that it fits the bike, and suffer the horsepower consequences. Hopefully, with info from you and Jan, I can see if there would be a large difference between up-pipes or down-pipes.
Thanks, again!
Re: RZ350 Super Motard
Posted: Fri May 11, 2018 7:10 pm
by JanBros
Smoker wrote:JanBros wrote:best is to let the baffle end in the stinger with a nozzle, and then go wider again. that way the diemater or length of the stinger has no influence anymore.
I cannot view this photo. Maybe it would have made the explanation clear. I do understand now. Thanks, again!
don't know if you need to be logged in on that forum to view pics. here is the link :
https://www.kiwibiker.co.nz/forums/show ... er/page833" onclick="window.open(this.href);return false;
Re: RZ350 Super Motard
Posted: Sun May 13, 2018 6:54 am
by Smoker
Thanks, Jan. I can't see the pics, but there is a lot of good info to read.
Started working on the gearchange lever, brake pedal, and footpegs, to make sure there are no clearance issues with the mockup downpipes.
Gearchange lever may be a problem, not sure yet. The gearchange shaft is pretty far forward. Looks like the custom lever might be very short. Might not have much leverage.
Spent a ridiculous amount of time looking for footpegs. I already bought footpegs, but I would need to make custom adapters. Plus, I think they would be good for another project. Not many pegs made to fit the SXV. Can modify CRF pegs to fit, but can mess up the finish. Ended up ordering Pivot Pegz. They're trick, and polished stainless, so I can have them gold TiN coated like the hardware.
Re: RZ350 Super Motard
Posted: Sun May 20, 2018 12:59 pm
by Smoker
Hard to get a good pic, but the new pegs look great on the bike.
They are extra wide, very thick, and unfortunately HEAVY.
I'm happy, though.
Re: RZ350 Super Motard
Posted: Fri Jun 01, 2018 3:18 am
by Smoker
Re: RZ350 Super Motard
Posted: Wed Jun 06, 2018 1:46 pm
by two-stroke-brit
is the set screw an anti vibration aid ?
Re: RZ350 Super Motard
Posted: Wed Jun 06, 2018 3:45 pm
by Smoker
two-stroke-brit wrote:is the set screw an anti vibration aid ?
Still vibrates, but the connection won't come loose.
Re: RZ350 Super Motard
Posted: Thu Jun 07, 2018 12:01 pm
by evan_calgary
Very cool like usual! I like the footpegs!
Re: RZ350 Super Motard
Posted: Mon Jun 18, 2018 8:35 am
by Smoker
I like using anodized aluminum washers with titanium bolts, but remembered there are a few places I'd rather not.
Will be changing out the aluminum washers for titanium washers on the motor mounts, torque bars, rear sprocket and brake rotors.
Re: RZ350 Super Motard
Posted: Sun Jun 24, 2018 3:42 pm
by Smoker
Would like to make parts #2 and #7 out of .090" titanium sheet (2 sets).
They hold the kickstand springs to the kickstand and frame. Would look cool polished and gold TiN coated like the other hardware.
The holes are approx. 10mm and 6mm, for size reference. I could cut them by hand, but will look much better cut by machine.