1974jh5
Curmudgeon.
Yeah, I know, who needs snowmobiles down here in SC? 
Here's the deal: I am gathering the parts to build an A Modified autocross and hillclimb car. Unless I want the thing to understeer and plow like a tractor I need to run a Torsen differential which requires lubrication, it's best for it to run in an oil bath, running it in the open creates a vast number of sealing problems. It can be done, but talk about a PITA... that also creates unequal driveshaft length etc problems.
So to keep the rotation directions correct I need to run a chain drive gearbox and it looks like a Hy Vo chain inside is the deal with a 530 from the engine to the gearbox. I can find Hy Vo chain in industrial supply places, but the sprockets are a PITA. They jump straight from 42 to 57 to 76 teeth, no in betweens. 42's too small, 57 and 76 are too big (limited amount of space).
So I found some 3/4" wide snowmobile sprockets which are available in 46 tooth, which might do just what I want. I'm concerned about the power handling capability, though, I will be pushing ~150 HP (R1 Yamaha motor) through this thing to a set of 8" or 9" wide slicks. The Team Aftermarket and EPI sites just say 'high tensile strength' but don't give any specs. Morse says 5,950 pounds for 3/8 pitch 3/4 wide chain and 8,500 for 1 inch but that's industrial chain, not powersports stuff. Don't want to use a 'silent' chain, the capacity is something like 2/3 that of the Hy Vo.
Any of you Northern types able to shed some tensile strength and HP capacity light for me? Does anyone make a 1" wide Hy Vo conversion kit?
Here's the deal: I am gathering the parts to build an A Modified autocross and hillclimb car. Unless I want the thing to understeer and plow like a tractor I need to run a Torsen differential which requires lubrication, it's best for it to run in an oil bath, running it in the open creates a vast number of sealing problems. It can be done, but talk about a PITA... that also creates unequal driveshaft length etc problems.
So to keep the rotation directions correct I need to run a chain drive gearbox and it looks like a Hy Vo chain inside is the deal with a 530 from the engine to the gearbox. I can find Hy Vo chain in industrial supply places, but the sprockets are a PITA. They jump straight from 42 to 57 to 76 teeth, no in betweens. 42's too small, 57 and 76 are too big (limited amount of space).
So I found some 3/4" wide snowmobile sprockets which are available in 46 tooth, which might do just what I want. I'm concerned about the power handling capability, though, I will be pushing ~150 HP (R1 Yamaha motor) through this thing to a set of 8" or 9" wide slicks. The Team Aftermarket and EPI sites just say 'high tensile strength' but don't give any specs. Morse says 5,950 pounds for 3/8 pitch 3/4 wide chain and 8,500 for 1 inch but that's industrial chain, not powersports stuff. Don't want to use a 'silent' chain, the capacity is something like 2/3 that of the Hy Vo.
Any of you Northern types able to shed some tensile strength and HP capacity light for me? Does anyone make a 1" wide Hy Vo conversion kit?
