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Old 02-12-2010, 12:09 AM   #1 (permalink)
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fastest vintage free air

I am talking about pre 1985 sleds...what is the best/fastest free air overall. Im building an Srx 440 right now but also want to race with my buddies in the f/a division. One has a 1975 Mercury Sno Twister, and the other has a 1975 Yamaha GPX 433. Their sleds seem to be one of the fastest in the straights, on the oval track. Thanks for the help, I am new to the site.
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Old 02-12-2010, 06:44 AM   #2 (permalink)
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I had a 1974 Arctic Cat 440 :el tigre: it was a free air Kawasaki engine with two plugs per cyl,i purchased it new from our local dealer so i am certain it was never modified.IT was used every year until about 1983 when it got hit while parked on the shoulder of the road. Anyhow it was never beaten by any other sled .the closest any body ever got to it was in a yamaha 440 liquid.srx .my neighbor at the time blew up his Moto Ski Sonic twice after mods trying to keep up.We would usually race from a dead stop for about a half mile. Nothing organized ,just guys having fun.
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Old 02-12-2010, 05:03 PM   #3 (permalink)
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If you could find a 1973-74 tnt 440 free air they would give the sno twister a run for the money also the sno-jet thunderjet 440 was a success on the drags and oval tracks.
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Old 02-12-2010, 06:41 PM   #4 (permalink)
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or a 78/79 Polaris 440 TX or TX/L
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Old 02-13-2010, 01:05 PM   #5 (permalink)
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how are those TNT's compared to the other sleds in handling?
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Old 02-13-2010, 02:01 PM   #6 (permalink)
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The 440 tnt free air had good handling and had hydraulic brakes providing better braking and the engine had lots of power.
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Old 02-13-2010, 04:35 PM   #7 (permalink)
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The '75 Merc Sno-Twisters were absolutely awesome.

Pretty hard to beat the 440 and 500cc El Tigres, too.
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Old 02-13-2010, 07:20 PM   #8 (permalink)
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The 440 tnt free air had good handling and had hydraulic brakes providing better braking and the engine had lots of power.
I have a 74 tnt everest 440 they are a quick machine they will give alot of sleds a run for your money. I also like the 440-500 el tigres they are also a quick machine
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Old 02-13-2010, 07:51 PM   #9 (permalink)
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What year are the best for the 440 f/a el tigres....is the one with the dual spark plugs per cylinder a good one?
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Old 02-13-2010, 10:00 PM   #10 (permalink)
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What year are the best for the 440 f/a el tigres....is the one with the dual spark plugs per cylinder a good one?
Really fast mid 70s Tigers were Zs. As in El Tigre Z.
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Old 02-14-2010, 08:40 AM   #11 (permalink)
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The fastest free air engined sled was the Boss Cat.
4 cylinder 800cc in a frame that weighed in at just over 400#.
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Old 02-14-2010, 11:51 AM   #12 (permalink)
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Quote:
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The fastest free air engined sled was the Boss Cat.
4 cylinder 800cc in a frame that weighed in at just over 400#.
very very true but you really can't find them for under 8 grand anymore... just saw a restored one go for over 12 grand on ebay.
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Old 02-14-2010, 02:28 PM   #13 (permalink)
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I just went to the Great Eastern Whiteout in Fulton NY yesterday and saw a 1971 AMF Ski-Daddler XX in showroom condition... It was a 4 cylinder I couldnt believe they made such a monster back in the day. I will get a pic up once I got them loaded...
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Old 02-14-2010, 07:44 PM   #14 (permalink)
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I wish I have more pics of it, its spotless! How fast you think this thing is? I dont even know how many cc's this baby is... Anyone?
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Old 02-14-2010, 09:49 PM   #15 (permalink)
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Quote:
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The fastest free air engined sled was the Boss Cat.
4 cylinder 800cc in a frame that weighed in at just over 400#.
Maybe you meant King Kat. Far as I know, all the early Boss Cat's were a one off speed run affair.

King Kats kingkats

Boss Cats The Boss Cat Legacy

I also think that the hp to cc ratio around 1970 was pretty dismal.

I around 1997 watched a mid 70s oval prepped srx lose an open class local drag race. It wasn't for lack of power. I was looking at it's track later in the day and noticed that the 300 or so studs were bent to around 90 degrees. I was thoroughly impressed. The picks were a little on the thin side but still...
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Old 02-15-2010, 07:49 AM   #16 (permalink)
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I dont have a clue on teh cc's of that 4 banger i've never seen a ski daddler with it in it. ive always seen 1-3 cylinders in them.
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Old 02-15-2010, 08:30 AM   #17 (permalink)
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Not a production sled.
It's a one off garage mod.
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Old 02-16-2010, 09:31 AM   #18 (permalink)
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The guy own a sled shop out in Tonawanda I believe. IDK but it looked like it was meant to be there! Everything looked like it was dont right.
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Old 02-16-2010, 09:41 AM   #19 (permalink)
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Ive only ridden one free air sled, that being a 1980 Kawi Drifter F/a 340. Not very fast, but a fun little mess around sled. I dont really know what would be the fastest, but im thinkin one of the cat f/a sleds.
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Old 02-16-2010, 11:49 AM   #20 (permalink)
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The Sno-Twisters are tough to beat for speed but are pretty spendy. The Ski-Doo RV sleds are probably second but the engines are pretty fragile.

Polaris TX is probably the most rugged of the freeairs, I'd love to have one but they're surprisingly uncommon in New England.

The El-Tigre is a good sled. Later models ('76 or '77 and later) have superior Suzuki engines although the early Suzukis are not as fast as the late Kawasaki. Later Suzuki engines have more ports and make more power.

All those sleds are muscle machines and kidney busters when you're blasting around. There were several years when the Pantera could be had with the same freeair Suzuki only mildly detuned. You end up with more power than the fan cooled but with the more comfortable suspension of the Pantera.

In all cases remember that the sled that isn't moving isn't cooling, don't idle for long...
Of course with that said don't just start the sled and get on it hard, a short warm up is important.

I want another freeair sled. I had an '81 El Tigre which was a great machine, now I want a TX.
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