Larger Lower Gear?

[bjerrang]

got the 21-40 now with the 70link chain. Its a bit to long so a 41-42T down would be great. With the 18T option i need a new chain , and its way more expensive. Where can i get it? ulmer ?

You talking reverse? For reverse 42T, you can get it from Ulmer, but it requires modifying the reverse idler gear on a lathe.

The reverse gears are expensive (about 150). It might be cheaper to get an 18 tooth top and a new chain. Might be better getting a new chain if your sled is older anyways.

I hope this helps.

I does. great!
The new chain and the smaller top gear is at the same price as the lower one. But the stress-level on the even smaller top gear is big so if you got a turbo or something its better to go for the larger bottom gear.
How do i modify the reverse idler gear on a lathe ?

 

[rlcofmn]

got the 21-40 now with the 70link chain. Its a bit to long so a 41-42T down would be great. With the 18T option i need a new chain , and its way more expensive. Where can i get it? ulmer ?

You talking reverse? For reverse 42T, you can get it from Ulmer, but it requires modifying the reverse idler gear on a lathe.

The reverse gears are expensive (about 150). It might be cheaper to get an 18 tooth top and a new chain. Might be better getting a new chain if your sled is older anyways.

I hope this helps.

I does. great!
The new chain and the smaller top gear is at the same price as the lower one. But the stress-level on the even smaller top gear is big so if you got a turbo or something its better to go for the larger bottom gear.
How do i modify the reverse idler gear on a lathe ?

If you go to a turbo I cant see you wanting any lower than 20-40 with th insane track speed. A normal hillclimb that im running 45 with my stocker you would be pulling 80 plus on a turbo and thats about all you can get with a 20-40 so I dont know why you would want less gear. IMO stocker 19-40 is as low as I would go and 20-40 on a turbo.

 

[Mountaintech]

got the 21-40 now with the 70link chain. Its a bit to long so a 41-42T down would be great. With the 18T option i need a new chain , and its way more expensive. Where can i get it? ulmer ?

You talking reverse? For reverse 42T, you can get it from Ulmer, but it requires modifying the reverse idler gear on a lathe.

The reverse gears are expensive (about 150). It might be cheaper to get an 18 tooth top and a new chain. Might be better getting a new chain if your sled is older anyways.

I hope this helps.

I does. great!
The new chain and the smaller top gear is at the same price as the lower one. But the stress-level on the even smaller top gear is big so if you got a turbo or something its better to go for the larger bottom gear.
How do i modify the reverse idler gear on a lathe ?

If you go to a turbo I cant see you wanting any lower than 20-40 with th insane track speed. A normal hillclimb that im running 45 with my stocker you would be pulling 80 plus on a turbo and thats about all you can get with a 20-40 so I dont know why you would want less gear. IMO stocker 19-40 is as low as I would go and 20-40 on a turbo.

2010 SE's are running 18/40. 19/42 is a popular ratio in other mountain sleds. At least 2.2 ratio in the chaincase has been proven to work well. The lower ratio helps to compensate for turbo lag as well.

 

[bjerrang]

Yes i got a turbo.
The norwegian standard on the 162 SE is 22/40 , im now down to 21/40 with the stock 70 chain. Now the chain is a bit long so i want an 42T down.
When i use http://www.turboaddictionparts.com/cata ... lator.html with 8900 rpm and 0.9 in overdrive i get 139mph at 22/40. Its insainly high gearing. I guess with the turbo i would like an max gearing to be at 105mph. Over that the maveric junk would die i guess.

 

[Mountaintech]

Yes i got a turbo.
The norwegian standard on the 162 SE is 22/40 , im now down to 21/40 with the stock 70 chain. Now the chain is a bit long so i want an 42T down.

You'd be better off getting a 20T top for next to nothing off someone, and shortening your chain to 68L or buy a 68 L. Bottom gears for reverse chaincases are expensive.

 

[bjerrang]

My calculation was off. Got it right now. At 9000 rpm 7 tooth 0.9 overdrive.
22/40 is 109mph 21/40 is 104mph.
21/42 is 99mph , that sounds about right for an 162" turbo, or what?
20/40 is also 99mph. So either new chain and 20T gear or just a 42T.

 

[rlcofmn]

Just give me a couple bucks plus shipping and ill get the 20 tooth gear and chain I have laying here on its way to ya.