wg5936

looking to put an 2001 Arctic Cat 600 motor out of a Mountain King on an airboat. Was thinking of using the clutches out of the sled but need to know what rpms they are turning at to get the prop speed correct. Obviously that varies with the RPM of the motor, but assuming the power band is around 6500 of the motor, and i need the prop on the boat to be around 2800-3000. Anyone have any thoughts or data on such a thing? Or Anyone know of a belt reduction system that would work on the horse power that motor produces that would bolt on? thxs W

BC_Dan

The front (primary) pulley spins at engine speed. The rear (secondary) pully is infinitely variable from 0 to 1:1. Gear reduction (torque multiplication) is accomplished in the chaincase where a small sprocket on the jackshaft (driven by the secondary) drives a bigger sprocket on the driveshaft.

I'm not sure on the AC powerband, the Polaris 600 makes it's power around 8k with max torque a bit before that. With the engine at max. power, the ratio for the pulley system is designed to be close to 1:1, so if the engine is turning about 8k, the secondary is also turning about the same. You will have to step it down a bunch to get it to 2800-3000.

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2007 Dragon RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 95 Prowler 550 2-up, 1990 Indy 650, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php

kccats

The 2001 could have the APV (power Valves). The primary clutch engages at about 4000 rpm and will run out to about 8200-8300. The chain case usually will gear it down about in half.
But be sure to get all the electronics! Is it EFI?

wg5936

yes it has the power valves and is fuel injected, thanks for the info guys, that gives me a place to start. just need to do some math with the gears in the gear case. thxs W

BC_Dan

Post some pics as you progress, it would be fun to watch your progress...

__________________
2007 Dragon RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 95 Prowler 550 2-up, 1990 Indy 650, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php

smokingcrater

You do not want to use a CV belt drive system on a prop... CV's are meant for variable loads, a [fixed] prop is completely constant. They are also fairly inefficient, at least compared to a fixed belt/chain drive.

Anyway, you are going to want to look at a fixed belt drive system with about a 3:1 reduction. Dig around in the ultralight airplane communities, lots of those guys are using rotax engines that are relatively similar to snowmobile engines, at least in powerband/rpm. They will have suitable belt drive reduction systems.

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1) 2000 Arctic cat ZR 700, which now thinks it is a 2001 ZR 600 EFI APV w/136" ripsaw. (for sale!)
2) 1995 Yamaha VMAX 600, which now thinks it is a Polaris! (Polaris x10 suspension, Polaris P85 clutch) (for sale!)
3) 2004 Yamaha Warrior
4) 2006 Yamaha Nytro

600RacerX

X2. Fixed would be so much easier

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