straight cut drive gears

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SEB4LO
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#16 Post by SEB4LO » Wed Jul 16, 2008 5:36 pm

Saving4Parts wrote:Thanks for bringing this back up, it'll give me a chance to ask if anyone has tried the RDZ 2.36 straight cut primary. Does anyone have a photo of one fitted? I'd be interested to see the clutch case clearance.

i have 2.36 ratio on my 550 cheetah , needs to modifiy the water impeler washer and plastic gear and a few mm machining on the case

useless until you run a HUGE cheetah :smt002
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#17 Post by Saving4Parts » Wed Jul 16, 2008 9:45 pm

Thanks Seb4Lo. Do you happen to have any pictures of the primaries during and after installation. Cheers
"My biggest problem is that I have absolutely no fear whatsoever, and that scares me"

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#18 Post by oldracer » Sat Jul 19, 2008 2:44 pm

I fitted a set of Banshee straight cuts on my RZ just to eliminate the side thrust and give the main bearing an easier life. I run pre-mix so no pump problems. The ratio is slightly different but not noticable when riding, the noise is noticable, loud at idle. But thats why the helicals are used on road bikes.

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smurph
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#19 Post by smurph » Sat Jul 19, 2008 5:42 pm

The RZ500 has straight cut primary gears and they are not loud.

The biggest thing with straight cut gears is they have lash. That is what should make the most noise. A helical gear may have lash as well, but the helix dampens it. Lash is a problem on the 500, especially with two cranks bouncing around on the driven gear. They have anti lash gears on them, but they don't pretend to even get close to working. Sometimes, it sounds like there is a few loose rocks under the clutch cover.

If you hear a whine, then the gears are not machined correctly, properly spaced, or a combination of both. Properly cut and meshed straight cut gears do not make much noise at all.

I have heard gear drives on street rods that whine like the dickens. But my BBC gear drive didn't make a sound. It had an adjustment on the idler gear to mesh the gears properly.

So beware if you hear too much "race" noise. It means that something is not right.

Steve
Fuel Injected RZ350

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ax-racing
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#20 Post by ax-racing » Sun Jul 20, 2008 12:39 pm

Good analisys Smurph :smt001

have you any experience to take off anti-lash gears on rz500 engine ?

another question, someone can tell me where to find straight cut
gear set for rz-350 ?
i search it on ebay but nothing come out

thanks
Alex

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#21 Post by SEB4LO » Sun Jul 20, 2008 2:14 pm

RDZ racing for banshee , he sells tons of them but no damper in the kit neither rivet only the two gears

:smt002
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#22 Post by smurph » Sun Jul 20, 2008 3:09 pm

ax-racing wrote:have you any experience to take off anti-lash gears on rz500 engine ?
Yes. I didn't use them when I rebuilt my engine. But I put them back on immediately.

When I was getting the bike running well (jetting and syncing carb, adjusting the auto lube pump cable), I fouled a few plugs. When the engine kicked back on a cylinder or two, It sounded terrible!!! You could feel the backlash in the foot pegs! It was so bad that I thought something was bad wrong under the clutch cover. I really thought something had come loose and was getting crunched up in the gears. Removing the clutch cover revealed nothing. All was well, so I installed the anti-lash gears to see if they would quell the madness that was going on.

When I put the anti-lash gears back on, the noise was drastically reduced but still very noticeable. So they do some of their job. Once I got my fouling problem under control, I don't hear or feel a thing from them. Maybe they are doing all that they are supposed to do as long as you don't have plug problems.

The next 500 engine I build will retain the anti-lash gears. Removing them is not worth the few extra HP, IMHO. Not if you are going to ride the thing on the street on a daily basis. I might remove them for a pure race application.

Steve
Fuel Injected RZ350

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#23 Post by ax-racing » Mon Jul 21, 2008 5:00 am

Thanks for imnformations Smurph, naturally my question was for a
track bike :smt001

Yes, Seb, the anti-slash question was for 500 engine
some times ago a friend in italy build twenty set of straight cut gear
for 350 engine, now this set are ended and some people are looking for
new possible supplyer.

i'm building a straight gear too, but my project is for a dry clutch
and can not be mounted with stock clutch and covers.


Image

Image

Image
Alex

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#24 Post by Saving4Parts » Wed Jul 23, 2008 1:34 am

Alex are you using TZ350 dry clutch components? What application is this engine for?
"My biggest problem is that I have absolutely no fear whatsoever, and that scares me"

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#25 Post by ax-racing » Wed Jul 23, 2008 3:10 am

No, i build myself primary gears and apply a ducati basket clutch
enigine is shortened in the rear to fit a TZ 250 gp frame

Image

here you can find a story of the project and several pic's of
machining parts (in italian, sorry :smt002 )

http://www.rd-club.it/frmdlclb/topic.asp?TOPIC_ID=5671
Alex

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#26 Post by hellmanns » Thu Jul 24, 2008 12:57 pm

your projects are Sbalorditivo!!!

but I just want the straight cut... :smt017
Last edited by hellmanns on Thu Jul 24, 2008 4:08 pm, edited 1 time in total.
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Smoker
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#27 Post by Smoker » Thu Jul 24, 2008 1:47 pm

Image

Holy shit!!! [smilie=eek.gif] That is amazing work.

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#28 Post by Saving4Parts » Thu Jul 24, 2008 7:16 pm

I would of thought those cast case covers would be very difficult to weld. You have done a terrific job. Will you be using the ducati oil seals as well?
"My biggest problem is that I have absolutely no fear whatsoever, and that scares me"

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#29 Post by ax-racing » Fri Jul 25, 2008 11:03 am

Yes i use oil seals too

welding cast aluminium is possible (not for me, a professional welder done it)
he say that the bigger problem can be dirt or paint residuates
that contaminate fusion during welding.

an accurate sandblast made good result.

i need to weld not only clutch covers but all the rear of cranckase
to shortening engine. all new parts welded are made from billet 6000
alluminium allloy.
Alex

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#30 Post by hellmanns » Thu Jul 31, 2008 5:39 pm

Ax, what is your primary ration?

those sraights comes from TZ?
Image
"...It's just like traveling on a plane, but, without that horrible meal... and with the window opened..."
(RD350 87')

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