Top Speed Runs NA VIPER

[tapex_07]

I would too but although I still am not happy speed wise with my Viper I also ride it hard in the big bumps. 9 tooth hangs down enough already. I think 10 tooth would hit before suspension bottomed in the rough.

You think the 9t 2.52 pitch would hang to low? 9s are still smaller than a 8t 3.0 pitch anti ratchets.. I'm thinking 10t would be about the same overall diameter as the 8t 3.0p anti because of the tips on them. I too still want to be able to ride the sled hard in the rough stuff!

 

[cannondale27]

You think the 9t 2.52 pitch would hang to low? 9s are still smaller than a 8t 3.0 pitch anti ratchets.. I'm thinking 10t would be about the same overall diameter as the 8t 3.0p anti because of the tips on them. I too still want to be able to ride the sled hard in the rough stuff!

Good point. You are right. Would be smaller since tips are gone.

 

[cannondale27]

Cannondale i recall talking to you about drivers and robbing speed, What is the part number of the cat rr drivers ? thanks Bruce

0728-203 they are 9tooth 2.86 pitch complete assembly. If ambitious drivers themselves can be bought Seperate. About $20 each.

 

[Mtnviper]

Snowmobile driver diameter specifications (copy/paste from my website)

2.52” pitch drivers inches Metric (rounded to nearest mm)

10 tooth 8.021” diameter 204 mm

9 tooth 7.219” diameter 183 mm

8 tooth 6.417” diameter 163 mm

7 tooth 5.615” diameter 143 mm

2.86” pitch drivers

8 tooth 7.283” diameter 185 mm

7 tooth 6.373” diameter 162 mm

3.00” pitch drivers

8 tooth 7.639” diameter 194 mm

7 tooth 6.685” diameter 170 mm

Changing driver size will also effect over-all gear ratio. For example when changing from a 2.52” 9 tooth driver to a 2.52” 8 tooth driver. You would multiply your 9 tooth ratio by 1.13.

Example: 20/40 gears with 9 tooth drivers would be 2.00 to 1. When switching to 8 tooth drivers with the same gear set the new ratio would be 2.26 to 1. (2.00 x 1.13= 2.26)

Note: the 1.13 multiplier only applies to 2.52” pitch drivers. Although the 2.86” is fairly close to the 2.52" and could be used for a 2.86" driver to get a general idea of ratio change.

 

[Krummy]

9 tooth 2.86 and 10 tooth 2.52 are virtually the same diameter (9 tooth 2.86 is slightly larger). I went through this same decision process when picking out a track/driver setup for my nytro. I am currently debating pulling out my drive axle and chucking it up in the lathe to remove the extrovert teeth.

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[cannondale27]

9 tooth 2.86 and 10 tooth 2.52 are virtually the same diameter (9 tooth 2.86 is slightly larger). I went through this same decision process when picking out a track/driver setup for my nytro. I am currently debating pulling out my drive axle and chucking it up in the lathe to remove the extrovert teeth.

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I thought about cutting them off too but you would end up with holes where they are. Track is ordered already so committed to it. Same 1.25 Ripsaw2 but fully clipped and no silent bumps.

 

[blueironranger]

I was just looking into 2.86 driver setups avalible for the MTX, Just about ready to pull the trigger on a leftover 153 MTX and Camoplast makes a 154 Ice cobra which is 2.86 drive. This would kill 2 birds with one stone, gearing it up and 2.86 drive! I've never had trouble intros in the past and I don't like running loose tracks either.

 

[cannondale27]

I was just looking into 2.86 driver setups avalible for the MTX, Just about ready to pull the trigger on a leftover 153 MTX and Camoplast makes a 154 Ice cobra which is 2.86 drive. This would kill 2 birds with one stone, gearing it up and 2.86 drive! I've never had trouble intros in the past and I don't like running loose tracks either.

You guys have any snow there?

 

[blueironranger]

You guys have any snow there?

Yes, for now, hopefully it stays cloudy the next couple of days till the temperature drops. I was out yesterday and the trails were holding up well and still about 18" off trail.

 

[cannondale27]

Really want to ride your area this year. Good to know its still holding up. Thanks!

 

[cannondale27]

Snowmobile driver diameter specifications (copy/paste from my website)

2.52” pitch drivers inches Metric (rounded to nearest mm)

10 tooth 8.021” diameter 204 mm

9 tooth 7.219” diameter 183 mm

8 tooth 6.417” diameter 163 mm

7 tooth 5.615” diameter 143 mm

2.86” pitch drivers

8 tooth 7.283” diameter 185 mm

7 tooth 6.373” diameter 162 mm

3.00” pitch drivers

8 tooth 7.639” diameter 194 mm

7 tooth 6.685” diameter 170 mm

Changing driver size will also effect over-all gear ratio. For example when changing from a 2.52” 9 tooth driver to a 2.52” 8 tooth driver. You would multiply your 9 tooth ratio by 1.13.

Example: 20/40 gears with 9 tooth drivers would be 2.00 to 1. When switching to 8 tooth drivers with the same gear set the new ratio would be 2.26 to 1. (2.00 x 1.13= 2.26)

Note: the 1.13 multiplier only applies to 2.52” pitch drivers. Although the 2.86” is fairly close to the 2.52" and could be used for a 2.86" driver to get a general idea of ratio change.

Cool Chart! I get right about 8" for the 2.86 9 tooth drivers so yes 10tooth in 2.52 would be doable for sure.

 

[STAIN]

This is interesting, my turbo Viper is due for a track......

 

[Krummy]

I thought about cutting them off too but you would end up with holes where they are. Track is ordered already so committed to it. Same 1.25 Ripsaw2 but fully clipped and no silent bumps.

I am running ski-doo 10 tooth extrovert drivers and i am wondering if they are hollow under the externals or not. Thanks for the heads up

 

[TD Max]

Curious if you've spun the new assembly on a lathe to check runout and true up?

 

[DT]

I thought about cutting them off too but you would end up with holes where they are. Track is ordered already so committed to it. Same 1.25 Ripsaw2 but fully clipped and no silent bumps.

Not sure if the "silent" track is the reason but I like how "quiet" the Cat drive train is. I hated the drone on Apex and Vector's (not sure of the Nitro's). Please let us know if this changes with what you're doing.