Primary Belt Drive Pros and Cons?
- Thread starter Brooking 850
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Yep every maker and seller says its fine to run sealed oil tight and venting is just an art deco expression, unless in Gritty conditions then it grinds belt edges away and it un-ravels to pack up in fully pulley and alternator. Dasmhik. About only thing that gets harmed by the heat is the alternator and then its just more resistance so less out put, if you could even measure that lost in a road bike. Racers now are good example to follow, they vent and remove the alternator, but for less mass and drag I hear.
I did vent the primary cover when I installed a belt drive. More for aesthetic reasons than any thing. I patterned holes , four over the alternator, five over the clutch, the same diameter as the inspection plugs. I just like the looks and so far, no problem with any intrusions. I lean toward a cooler-is-better school of thought. No argument against leaving well enough alone, though.
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The thing I don't like about venting the cover is you expose the parts to water and dirt. That doesn't seem like a good idea to me. It's good to know that it isn't necessary.
On my Ducatis I usually run the stock closed clutch cover. I had a ventilated cover on the 998 but I did not ride that bike in the rain, or on any rides longer than about an hour or so. It was strictly a fair weather canyon strafer. :twisted:
Debby
On my Ducatis I usually run the stock closed clutch cover. I had a ventilated cover on the 998 but I did not ride that bike in the rain, or on any rides longer than about an hour or so. It was strictly a fair weather canyon strafer. :twisted:
Debby
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debby said:
Don't ride the Norton in the rain or dirt. Problem solved.
rvich
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rvich said:
This thread must be running on reserve by now...I was really just taking an opportunity to make a joke about venting (on the forum). But I have to say in all seriousness that dirt intrusion (as in road grime in general, and there is lots where I live) would be one of the reasons to "discredit" the idea of removing heat. Sometimes you gotta pick the lesser of two evils. But if vent you must then taking into condsideration the conditions you ride in when designing the vents would be of high priority.
I was hoping to get a little more information regarding the Maney belt set up. I sent an email to Steve Maney asking about the ratio of that kit and did not receive an answer as yet. Anybody with one know how close it is to stock or if different ratios are available?
Russ
This might have come up already, this thread is long and I didn't read it all. Syncroflex Gen III belts are rated up to 100C. I've run the previous version closed for a long time without a problem. I don't think neoprene belts are able to handle heat as well. It might make a difference when choosing which kit to go with if you want to be able to run it closed.
http://www.transdev.co.uk/pages/belts/s ... I_main.htm
http://www.transdev.co.uk/pages/belts/s ... I_main.htm
debby said:
Come on now debby, I've lived in Boulder and it can be rideable weather almost all year round. However, if you head up 119 to Nederland, it can be a different world.
I lived in Rollinsville for quite sometime also. Camp Shoshone. I was the maintenance man at the all girl dude ranch in 1975. Rough assignment!. I guess it has now transformed into a yoga retreat.
Now I can only dream of riding in such a glorious environment.
Sorry for the off topic ramblings.
Peter
Brooking 850
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Jim, you talking 19 tooth at the crank or 19 tooth at the gearbox, as you said 'sprocket' I take it you mean at the gearbox
Regards Mike
Regards Mike
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Yes, if you are running a 21 on the gearbox now and go to an RGM drive you will need to go to a 19 to be closest to your prior ratio.
Actually in comes out very slightly slower with the 19. If you want to go faster than you were before you can go to a 20 . It is a bit tall in town or in mountain twisties but great on the highway. Jim
Actually in comes out very slightly slower with the 19. If you want to go faster than you were before you can go to a 20 . It is a bit tall in town or in mountain twisties but great on the highway. Jim
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ludwig said:
It has to be near 50,000 miles sealed up in the cases, however, I do remember changing the belt a couple of years ago for no other reason than I'd bought a couple of spares with the belt drive and hell it looked dirty.
I remember fitting one to a Mk2a that did run off and that turned out to be caused by play in the sleeve gear bushes.
Thick and thin diaphragms, I never knew that, but then again have never had the need to measure them.
Cash
rvich
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Here is the reply I got from Maney regarding drive ratios on his belt drive kit:
"Hi Russ
Using my belt drive will raise your overall gearing by approx 1 gearbox sprocket tooth. my advise is to put the belt drive on, try it then alter the gearing if you feel it necessary.
I have belt drives on stock.
Steve"
"Hi Russ
Using my belt drive will raise your overall gearing by approx 1 gearbox sprocket tooth. my advise is to put the belt drive on, try it then alter the gearing if you feel it necessary.
I have belt drives on stock.
Steve"
one more good thing on the higher primary ratio is IF you like the 21 tooth counter shaft sprocket dropping to the 20 will change the final drive to a hunting ratio where as with the 21-42 it is a non hunting. some think the hunting is better for wear.
rvich said:
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