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Old 02-01-2010, 07:44 AM   #1 (permalink)
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snowmobile engine questions

i am in the planning stages of building a ifs, irs rear engine 4wd wit a zuk t case , yamaha rhino sized buggy.

and was thinking a snow mobile engine would be a great power plant choice, cvt with reverse compared to a crotch rocket wit manual gears and no reverse.

whats everybodys thoughts on using a snow mobile engine as a powerplant,

does anyone have any pics of snow mobile engines or a snow mobile with out the plastics.

flame away,

note: the engine would also have to be liquid cooled with a huge radiator, i was just told that snow mobiles pull air from underneith the sled to the radiator, and snow is cold so i would think i would need a large radiator.
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Old 02-01-2010, 07:47 AM   #2 (permalink)
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I don't know if a zuk case is strong enough, I know my sled makes almost 3x the hp.
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Old 02-01-2010, 11:52 AM   #3 (permalink)
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Look on ebay for just about every snowmobile chassis and engine pic you can imagine. These get parted out often due to damage that would be too costly to repair.

The common way for snowmobiles to be cooled is by heat exchangers in the tunnel or under the running boards that rely on snow hitting them for cooling.
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Old 02-01-2010, 12:20 PM   #4 (permalink)
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Originally Posted by yoterford View Post
i am in the planning stages of building a ifs, irs rear engine 4wd wit a zuk t case , yamaha rhino sized buggy.

and was thinking a snow mobile engine would be a great power plant choice, cvt with reverse compared to a crotch rocket wit manual gears and no reverse.

whats everybodys thoughts on using a snow mobile engine as a powerplant,

does anyone have any pics of snow mobile engines or a snow mobile with out the plastics.

flame away,

note: the engine would also have to be liquid cooled with a huge radiator, i was just told that snow mobiles pull air from underneith the sled to the radiator, and snow is cold so i would think i would need a large radiator.
Many years ago I built a Mini sprint car using a 2 stroke liquid cooled Chapperal engine. I lived on a lake at the time and used it during the winter just screwing around on the ice.

It was crazy fast. I used a small radiator from some Japanese Jalopy with an electric fan, it worked pretty well. I seem to remember having to play with the jets to get it to run right during the summer months.

Just an FYI, most of the snow machines (That still use a 2 stroke engine) that either my sons or I have owned need 2000 -3000 RPM before they make any power, they have realitively no torgue down in the lower RPM ranges. I would think it might get tiresome listening to that thing screaming away.

If it were me I would hunt down one of the newer 4 stroke sled engines. I believe most are fuel injected, along with producing a lot better torgue. Just my .02
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Old 02-01-2010, 12:25 PM   #5 (permalink)
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If it were me I would hunt down one of the newer 4 stroke sled engines. I believe most are fuel injected, along with producing a lot better torgue. Just my .02
They have higher rpm curves since they are bike engines retrofitted into a sled. They IMHO are more sluggish on the low end, unless you put a turbo on them. You can bump your clutch engagement way up, but you'll spin on take-off so it wouldn't be very good for crawling I wouldn't think.

In regards to the OP's mentioning revers, the newer Polaris' and Doo's have push button electronic reverse where it shuts the motor down and restarts it the opposite direction.
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Old 02-01-2010, 12:44 PM   #6 (permalink)
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They have higher rpm curves since they are bike engines retrofitted into a sled. They IMHO are more sluggish on the low end, unless you put a turbo on them. You can bump your clutch engagement way up, but you'll spin on take-off so it wouldn't be very good for crawling I wouldn't think.

In regards to the OP's mentioning revers, the newer Polaris' and Doo's have push button electronic reverse where it shuts the motor down and restarts it the opposite direction.

I have only been on one of the newer 4 stroke machines, I believe it was a 1000 Yamaha, I have to say, I was inpressed, I thought it pulled pretty good.
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Old 02-01-2010, 01:12 PM   #7 (permalink)
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I have only been on one of the newer 4 stroke machines, I believe it was a 1000 Yamaha, I have to say, I was inpressed, I thought it pulled pretty good.
They run good, not my cup of tea but they run good. But they build power at higher rpm's like the two strokes. But I bet the power delivery is smoother and more controllable down low. I think a sled engine would be a better application for a hill climber or the like.
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Old 02-01-2010, 01:28 PM   #8 (permalink)
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the newer sleds have a harsh takeoff sometimes when the clutch engages. My Polaris 800 will hit 8300rpm with the stock clutching but won't move till about 3000rpm. They do pull good with ~150hp but don't have much for a bottom end. I would think they would make a killer dune engine but not so great for a crawler. I have no experience with the 4 strokers though. My 09 800 Assault was my first sled :
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Old 03-19-2010, 09:08 PM   #9 (permalink)
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good idea but it might overheat really easily. what size engine are you thinking?
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Old 03-20-2010, 04:55 AM   #10 (permalink)
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I don't think there would be any way to get any engine braking.
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Old 03-20-2010, 07:41 AM   #11 (permalink)
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Old 03-20-2010, 08:43 AM   #12 (permalink)
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I don't think there would be any way to get any engine braking.

You dont think a stock brake on a sled will stop a 2,000 to 3,000 lb rig?


Fuji 488 fan FTW baby!!!



Thinking out loud here...

So you are going to attach the jackshaft to what?
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Old 03-21-2010, 04:31 AM   #13 (permalink)
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You dont think a stock brake on a sled will stop a 2,000 to 3,000 lb rig?
Well, on a long downhill it would keep you slowed down for a while until it overheated. I would prefer some engine braking on a rig with wheels. They coast just a little better than a snowmobile.
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Old 03-21-2010, 06:56 AM   #14 (permalink)
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i would not use a 488 fan fan motors dont run good when its like 35
there was a guy on spikes power block a couple years ago that had a tube buggy with a 600 xlt polaris motor and that thing could pull wheelies i used to have an extra 600 motor layin around i was gona put on a go cart and as for breaking if ur not runnin the chaincase(where u get ur gearing) with the motor u will need to make ur own brakes
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Old 03-21-2010, 06:45 PM   #15 (permalink)
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I've thought about building a buggy like this myself. I think you'll want to get a pretty new Polaris or Skidoo motor that's about 800cc's. I think you want it to be new enough that it's got fuel injection and the 'rer' reverse (reverse engine rotation...it's slick!). You'll need to run radiator, but not sure how big. Probably the size of a honda civic or something. Anyhow, you will probably need to hit up some folks on the sled forums for info on who can reflash the computer for you to make it run well in warmer temperatures. My sled probably looses 30% of it's power when it gets above freezing, so this motor would be worthless in the summer without some tuning.
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