I was refering to the snowmobile engine, not a banshee. A banshee already has a gear box, the snowmobile doesnt. I have gotten a couple of other responses on some other boards I visit, and it has been done, and with good results. From what they said, it wasnt very difficult at all. Biggest factor is coming up with a gear box with the number of gears you want. They range from 3-6 gears. Patrick

 

Can you make your own gearbox easily?

 

its not a matter of building the gearbox. Harley and a several others use a tranny that is seprate from the engine. they are coupled using a chain. it is similar to the cvt except that instead of a variable pully setup, you actually change gears. all it is an external gearbox. all you have to do is decide on how many gears you want, and figure out how to couple the engine to the external tranny

 

sounds like that guy is jelous cause he's been beat by snowmobile powered quads a few times. Saying a snowmobile is slow and has bad power to weight ratio is total BS. I am a factory trained and endorsed yamaha, suzuki, honda, polaris, tech and have a dynamometer license and currently work primarily on snowmobiles- mostly arctic cat and can tell you all a snowmobile motor is two cases, a crank, and a 2-stroke top end. It is light for the kind of power it produces. If a street bike motor were so much better then why is the RX-1ton - sorry RX-1 snowmobile with the R1 motor such a dog. It has 700cc horsepower with the weight of the old thundercats. Not a hot ticket around here in the mountains. The new mountain cat 900 motors can be made to have 350+ HP with the help of psi in a lightweight twin. Triples are slightly more weight but rev quicker, higher, and sound way sweeter. And the CVT clutch does take a little power from the motor (but so does a gear tranny) but the fact you dont shift makes it drag race all the faster when set up right. I plan to build a ZRT 600 powered quad drag bike for a guy in the near future and it will haul even though it has way less power than a 1000 (about 45 horse difference). It is hard to dyno a CVT motor because like said it is upshifting when accelerating so it cant be compared to a gear driven motor. Track dynos are to compare CVT motors to one another or to find what mods did to a given CVT motor. Dont kid yourself- it will be very fast. See ya at the oregon dunes in a few months!

 

funny how your extremely fast sled motors dont do sh*t on the hill. And no, i havent lost to a sled motor.

Glad to hear your mister harvard. Doesnt mean you know jack about drag racing though slick.

 

Its sounds like you've never seen a properly set-up snowmobile powered atv on a drag hill. I admit my main focus is dirt bikes rather than drag quads but i know enough to know a motor weighing just over 100 pounds with 170+ stock HP is going to be very fast whether you like it or not.

 

show me a 170+horse 100lb stock sled motor.

 

a stock thundercat motor has about 172 HP at the crank and weighs about 115. With a stock ZRT 800 motor with some good triple pipes you can get to almost 170 with even less weight.

 

I have seen hundreds of mini pullers, that would be similar to an ATV you are talking about makeing. most have snowmoble motors a few have bike motors. All make serious Hp, from the HP point alone, with the right gearing your going to be fast. Will you be as fast as a modded ATV, that races hills, not sure.

On my pic page, there is a golf cart with a 617 Bom motor in it that has been modded to 200 hp. It is my nefews, he pulls during classes just to give the crowd something to watch. I saw him race a croch rock cycle in 300 ft. He had to let off before the 300 ft because it became so unstable, but was ahead when he let off.

He is gear for power not speed, traction was a factor, if that says anything.

 

Back to the dyno, why the an auto Hp numbers are not really true numbers as opposed to a standard.

people on this forum jump on and off like me and say you can't compare the numbers, but never explain why, here is why I think that.

Most standards are dynoed in a 1:1 gear ratio. usually 4 gear in a 5 speed, or 5 in a 6 speed.

Autos are dynoed, and everyone knows, the more rpm, the more they are trying to shift up. The end ratio is higher than 1:1. If you hold it wide open, it goes into overdrive. People say you lose 30% through the cvt, that is the difference between the crank HP numbers and the actual WRHP numbers that the dyno gives.

Here is why snowmoble racers only use the dyno as a jetting tool and as a reference tool.

Put a snowmoble or Atv on a dyno. hold it to the pin, the dyno gives you a Hp #, Make changes in jetting or anything else, get all the HP you can. there you're done, it's the best it can be, right?

Want more HP, just change to heavier fly weights in the clutch. each time you add more weight to the fly weights you are adding to the rotateing mass of the clutch and dropping the RPm's therefore your clutch isn't shifting all the way out and is getting closer to a 1:1 ratio. Keep adding weight and you go below that ratio, each time you add more weight to a point, more hp.


Are you faster....NO..... "hey my Vforce makes 50 HP, I've lost 10 MPH and I'm 2 seconds slower than I was, but I got a dyno sheet that shows 50 HP and that all that matters on the forums is how much HP you make.

Not trying to bash anyone, most people swear by dyno results as you should, I just think differently on a CVT.

Hope this help explain my point of view.

Real world for a CVT is 300 ft times. make changes and test again.