2013 Belt Drive

[snowmobiler]

 

[knifedge]

--Why is the brake rotor still located on the jackshaft instead of the trackshaft?

--You would get fewer RPM of rotating mass, lower cg, and brakes would still work if belt/chain were to fail if brake was on trackshaft.

 

[Clarke673]

Since you asked yes, for what they charge you are getting reamed. Of course C3 utilizes the stock case center to center so they had to utilize a tensioner. CMX just didn't put enough forethought into their design or it would be closer to the two sprocket no tensioner design.

With the Polaris design you have twenty ratios available from 1:1 to 3:1 with the same belt. You will never need anything but a 70T belt if you use it as intended. If you want to split those twenty ratios further then by all means make a tensioner.

as far as i know CMX doesn't have a tensioner anymore, atleast on the pro kit..... just thought i would let you know that...

 

[LoudHandle]

--Why is the brake rotor still located on the jackshaft instead of the trackshaft?

--You would get fewer RPM of rotating mass, lower cg, and brakes would still work if belt/chain were to fail if brake was on trackshaft.

All valid points; the main reason is that due to the trackshaft's slower RPM the brake either needs to be a larger diameter or have more force like a four piston caliper. Both are doable options but you are adding back either chassis weight or rotating weight. After weighing the two options my guess would be that the jackstaft brake is the litest way to go (not having seen the actual engineering calculations).

 

[LoudHandle]

as far as i know CMX doesn't have a tensioner anymore, atleast on the pro kit..... just thought i would let you know that...

Thank you, I haven't kept up with their latest offerings. Is this the source for the upgrade kit you mentioned?

 

[BuffaloRMK]

Does anyone think there should be a tension adjuster of some sorts??

Or do you have to buy spare gates belts and change every other weekend??

If so im buying some stock in Gates??

We use these type of belts in manufacturing and they are bullet proof. They don't stretch or break...they will last a LONG time...

 

[Super A]

What if.... It works

 

[summitboy]

I just talked to a guy running the C3 on a Doo with over 10000km on it and the belt was still the same. He said it really never stretched. That was on a big heavy Doo LOL !

 

[cascadesnowjunky]

We run these in manufacturing also, they are far superior to chains. They do not wear like chain and sprockets and are much stronger. Belts have come a long ways recently. We run belts of similar size and style on tuthill blowers with 50 horse electric motors with no soft start that start and stop frequently with no issues, that is way more force than that belt will take on that sled.

 

[racerjb]

One should also take into consideration that the gears will expand a tiny amount as they heat up. So I believe they design the belt and gears as a package to allow for this. Material selection of the gears is also important. With the correct tolerancing and material, I feel there is no need for a tensioner. Just another thing for a person to mess with and possibly screw up. Keep it simple!

 

[Burr]

I would look at your belt drive if the price is right.

 

[Go4broke2stroke]

I think were forgetting that they use these type of belts in top fuel drag cars that run at 7000 hp, it takes over a 1000 hp to just run the blowers on them :shocked. They do occasionaly fail but this is under the most extreme conditions. I dont think they will ever fail in a 150 hp sled

 

[Ropin_tom]

I work with these belts every day in a mill, they are very good but in order for them to be properly tensioned there needs to be some sort of movement in the drive so that u can use the Gates meter witch measures the tension in hz. They r tough but aligment and tension is super important.

 

[907riders.com]

How many of us have cars with a belt nearly identical to this one running the cams,and in some cases in a 0 clearance motor. These belts last 8-10 years and 80,000 plus miles without issue, why would this be any different?

Timing belts on cars have automatic tensioners.

 

[fredw]

my c3 drive belt needs adjustment every so often, without an adjuster iwill get exspensive

 

[skidworth]

I think were forgetting that they use these type of belts in top fuel drag cars that run at 7000 hp, it takes over a 1000 hp to just run the blowers on them :shocked. They do occasionaly fail but this is under the most extreme conditions. I dont think they will ever fail in a 150 hp sled

Ding Ding Ding awesome this is why I started this thread in the first place what a dumb idea! lol I work on a team that runs these type belts. Am I an expert? Not at all! And is there a comparison between the two maybe? Just trying to see what everyone opinion is (very amusing if I do say so myself). Nobody knows for sure what will happen till next year this time. And As for the folks stating they don’t stretch YOUR WRONG!! If they didnt I would pull the tensioner off and save 5lbs and shave .001 of ET and win more races! And as for horse power it has nothing to do with it. Its all about RPMs we spin our motors to 10000 rpm with almost no tension on it, just enough to have a consistent length. We put 30 runs them for about 5 seconds and toss them and only put tension on them right before the run. Will they last I hope so this is a huge experiment on a much larger scale than CMX. Ill keep my 2012 Pro RMK for a couple years.