J and K engine class lakester

[TheFullMcbain]

What would be a typical engine used in J or K Gas Lakester? I'm guessing motorcycle but what would be a good one to start with?  Has anyone ever tried a snowmobile engine?  Track would Loring.

Thanks

[jacksoni]

That I am aware of there is a snowmobile powered ( 2 1000cc triples) in a streamliner campaigning at Bonneville. I think set the G record last year by a small amount. There is also snowmobile  based engine in GC, ALT and CC attempts in a door car. Holds a couple of records. Adapting to a longitudinal drive train takes some doing. The usual CVT belt does not lend itself to hot, high rpm, long runs ( belt gets hot and goes away). Shorter such as Loring might work but the offsets of engine and rest of drivetrain is a construction challenge. I have seen a Miata ( I think) with a CVT belt running in the Lemons class road racing bunch. Looks fun I must say.

[bob]

check out formula 600 , scca road race cars

[Stainless1]

When the Bockscar was a Streamliner, we used a 440cc Xenoah snowmobile motor and a Mac 10-10 Chainsaw motor to bring it up to size. Used the Mac to spin the Xenoah for start, and ran both dual throttles... but Lakesters can only have 1 motor... when Bockscar became a Lakester in 1984, we put a 750 Honda Interceptor motorcycle in it... no not just the motor, we put the motorcycle, frame, motor, swingarm... basically everything from the triple tree back except the tank, seat and fender in the car.
So yes, most use motorcycle motors... some all the way to G class.

PS read the rules before you buy a SCCA  formula 600 car to run at Bonneville. 

[jacksoni]

Another issue with any respectable two stroke and snowmobile in particular is packaging. This tends to be tight in special construction as in where do I put me, the engine, the tanks, the fire bottles etc etc in that small as possible space. Liner or lakester. The engines are small. The expansion chamber pipes are not. So, you know, 10 lbs of Subaru in a 5 pound bag. On the good side, they make a lot of power. 

[salt27]

There was a very successful single engine Polaris snowmobile powered streamliner I remember running about 30 years ago.    I think it was called "Mountain Raider" J/BGS #585, I believe it was using the snowmobile drive.

  Don

[Rex Schimmer]

I don't really think, from a practical point of view, that using anything except a late model 4 cylinder motorcycle engine is an option if your target is a record. They come with a state of the art design, a close ratio multi speed transmission and easy adaption using the original chain drive design which is pretty efficient and straight forward. I feel that to be successful in the lower class streamliner and lakester classes the real challenge is aerodynamics. You can start with a stock engine and work on your aero and then start adding power to get a record. I think that at one time the J lakester record was with a stock Suzuki 750.

Rex

[Speed Limit 1000]

The J/FL record is held by a stock junk yard Kawasaki ZX7R motor

[PorkPie]

The J/FL record is held by a stock junk yard Kawasaki ZX7R motor

...and is a couple years old, Brother....you and the team done a damn good job a long time ago....that was with an engine from the stone age of motorcycle engines...the I/FL is also not that bad...