Yep, they are naturally aspirated two strokes running on racing gasoline, at 1000 c.c.'s of displacement and putting out around 280 hp @ 9,600-9,800 rpm, in a 3 cylinder configuration. For comparison's sake, this would be like a 302 Ford putting out something like 1,400 hp naturally aspirated.
Nitromater
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pro stock snowmobile (1 Viewer)
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While a lot of the newer sleds have gone to four stroke engines, there are still an lot of fuel injected two strokes in the newer snowmobiles as well. Ski-Doo offers the "E-TEC" direct injected two stroke that is actually cleaner emissions wise than a comparable four stroke. Yamaha is nearly all four stroke now, while the other OEM's offer a mix of two and four stroke engines.
For the type of environment a snowmobile operates under, it's tough to beat the simplicity and light weight of a two stroke engine. Besides that, a well tuned two stroke will beat the brains out of a four stroke of similar displacement, all other factors being equal. That's why some of the newer four stroke snowmobiles are offered with turbo's and superchargers to get the power where it needs to be, but they still suffer from weight and complexity issues.
NHRA only runs the Pro Stock snowmobiles, but the Outlaw class of sleds are running turbo four strokes putting out over 600 hp, as well as BIG two stroke engines on spray. These snowmobiles were running in the low 7's at over 180 mph on the asphalt quarter mile, but were pulled back to 1000' earlier this year due to safety concerns. Now they are in the upper 6's at around 170 mph in 1000'.
Sorry for getting carried away here. I know this is a car and bike NHRA Forum, but being involved with the sleds as I am, I get pretty enthused when it comes to discussing the tech aspects of what I believe to be very well engineered and exciting drag racing vehicles.
For the type of environment a snowmobile operates under, it's tough to beat the simplicity and light weight of a two stroke engine. Besides that, a well tuned two stroke will beat the brains out of a four stroke of similar displacement, all other factors being equal. That's why some of the newer four stroke snowmobiles are offered with turbo's and superchargers to get the power where it needs to be, but they still suffer from weight and complexity issues.
NHRA only runs the Pro Stock snowmobiles, but the Outlaw class of sleds are running turbo four strokes putting out over 600 hp, as well as BIG two stroke engines on spray. These snowmobiles were running in the low 7's at over 180 mph on the asphalt quarter mile, but were pulled back to 1000' earlier this year due to safety concerns. Now they are in the upper 6's at around 170 mph in 1000'.
Sorry for getting carried away here. I know this is a car and bike NHRA Forum, but being involved with the sleds as I am, I get pretty enthused when it comes to discussing the tech aspects of what I believe to be very well engineered and exciting drag racing vehicles.
Don't apologize Chris, the sleds are bad-arse!! Anything that runs the 1/4, or 1000ft or whatever, with those performances deserve respect. In the early '70s, my dad & uncle became dealers for a little company out of Ohio I think. It was Speedway Motors, and these sleds were way ahead of their time. My uncle had a 650 triple, with the stinger pipes and all, it was wild. Even the bodies were wedge shaped and looked 10 years ahead of their time. I'm pretty sure those sleds are rare collectables now.
Yep, I remember the Speedway sleds very well. They were about the baddest thing on the planet back in the early '70's, and the metalflake blue paintjob was unmistakable. Believe it or not, I was working on a writing project for a snowmobile museum this past week, and came upon a mint condition Speedway there. Very sharp, and very collectable piece!
Mr. Gawboy, I think you and I must be practically neighbors. I recently relocated to Apple Valley, near the intersection of Diamond Path and Pilot Knob.
IF I'm not breaking any rules here by posting a link to another site, you can read a short piece I wrote for a snowmobile website detailing the class this past weekend at Brainerd:
Todd Serra Wins the ?Big Go? at the NHRA Nationals - Cool News - American Snowmobiler - American Snowmobiler Community
Mr. Gawboy, I think you and I must be practically neighbors. I recently relocated to Apple Valley, near the intersection of Diamond Path and Pilot Knob.
IF I'm not breaking any rules here by posting a link to another site, you can read a short piece I wrote for a snowmobile website detailing the class this past weekend at Brainerd:
Todd Serra Wins the ?Big Go? at the NHRA Nationals - Cool News - American Snowmobiler - American Snowmobiler Community
I bet those are a blast in the Snow!!!! However an inexperienced Rider could get Killed wit that kind of Power in the snow!
DrRocket
Nitro Member
Chris, check your private messages.
Yes Joe, they CAN do some serious hurt if they get out of hand, and it happens quite a lot up here, especially since alcohol gets mixed in quite a bit with some riders.
