RZ/RD 350 & Misc. 2-Stroke Tech BBS

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 Post subject: Re: RZ350 Super Motard
PostPosted: Thu May 10, 2018 5:56 pm 
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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.

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 Post subject: Re: RZ350 Super Motard
PostPosted: Thu May 10, 2018 9:25 pm 
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That makes it perfectly clear. :smt003

Please explain more, Jan.


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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri May 11, 2018 6:48 am 
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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

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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri May 11, 2018 10:35 am 
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Thank you very much, Jan! :smt006

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.


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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri May 11, 2018 10:40 am 
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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.

Image

I cannot view this photo. Maybe it would have made the explanation clear. I do understand now. Thanks, again!


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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri May 11, 2018 10:51 am 
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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

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! :smt006


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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri May 11, 2018 7:10 pm 
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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.

Image

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

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 Post subject: Re: RZ350 Super Motard
PostPosted: Sun May 13, 2018 6:54 am 
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JanBros wrote:
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

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.

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 Post subject: Re: RZ350 Super Motard
PostPosted: Sun May 20, 2018 12:59 pm 
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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.

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 Post subject: Re: RZ350 Super Motard
PostPosted: Fri Jun 01, 2018 3:18 am 
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Been searching exhaust couplings because the pipes wrap around the frame (up-pipes or down-pipes), and the stingers will need to be separate from the pipes.

These are the coolest exhaust couplings I've found, so far. They aren't made for 1 inch pipes, so they would have to be custom made.

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 Post subject: Re: RZ350 Super Motard
PostPosted: Wed Jun 06, 2018 1:46 pm 
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is the set screw an anti vibration aid ?

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 Post subject: Re: RZ350 Super Motard
PostPosted: Wed Jun 06, 2018 3:45 pm 
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two-stroke-brit wrote:
is the set screw an anti vibration aid ?


Still vibrates, but the connection won't come loose. :smt023


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 Post subject: Re: RZ350 Super Motard
PostPosted: Thu Jun 07, 2018 12:01 pm 
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Very cool like usual! I like the footpegs!


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 Post subject: Re: RZ350 Super Motard
PostPosted: Mon Jun 18, 2018 8:35 am 
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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.

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