Shaft drive bike motors
 

Looking at some parts online and started wondering why the shaft drive motorcycle motors aren't being used in midgets and or mini sprints. Could just hook up drive shaft like on the bike to a quick change. And the v4 motors are pretty inexpensive. Just kicking around ideas here so don't shoot me please.... Lol

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Re: Shaft drive bike motors
 

In midgets the rules state that the rearend must be directly by the crankshaft no trans gear reductions etc.

True. Easy way to convert a midget to a mini sprint tho.

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Re: Shaft drive bike motors
 

I've had the same thought, Pat; that's how the Dwarfs (Dwarves?) & Modlites do it.
Some Mini Sprint ass'ns don't allow V4's but a V-Max powered car running a driveshaft to a QC would be an interesting combo...
Don't shoot me either guys, just exercising the brain before work :D

Re: Shaft drive bike motors
 

UH, wouldn't that be then, a Kenyon Midget? Just sayin, about anything you can think of, has been done or tried, depends on the rule of the day! Bob

That's correct. I still have some of my old dwarf car stuff and I'm gonna play around with just moving the drivetrain over into a bare chassis I have. I have a 2000 Honda 1100xx still setup with the drive shaft setup so I figure what the heck. Might do a write up with pics because I was really easy to "bolt" the whole drivetrain together in my old car.

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Re: Shaft drive bike motors
 

You might want to look at the rules, MMSA says driveline to be CENTERED in the chassis, and the engine can't hang out, if you'll notice, a Kenyon midget left end of the engine, is really hanging, so maybe it's a grandfather deal, with the newer engines using a stacked gearbox, rather than behind each other, does cut this distance down some, but I don't know if it's enough to meet the current rule or not, but better ck.! Bob

Time to get out the tape and straight edge..lol

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Re: Shaft drive bike motors
 

Hello everyone!! i am new on this forum..
hopefully we have good exchange of view on this forum in future


:6:

Re: Shaft drive bike motors
 

Re: Shaft drive bike motors
 

That's a bit LARGE for anything but a full midget, besides, the fact it would be a step in the wrong direction, Harley may be everyones dream, but not in short track racing, the 4 cyl motors ROCK! Bob

It sure would sounds cool tho... Lol

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Re: Shaft drive bike motors
 

Talking about the v twins, I wish the rules at rumble would allow a v twin to race with the modified midgets! Nothing like the sound of a v twin screaming its guts out! Only thing other than a sprintcar engine at 8,000 rpms that sounds bada$$ is a single in a dirt track bike beating on the rev limiter at 12,000 rpms!

Re: Shaft drive bike motors
 

The only thing wrong with the shaft drive motors is the mfgs. never intended these to be raced. When BMW "the inventor of shaft drive motorcycles" went to a race motorcycle they made it chain drive.:11;

Honest Dad himself:6::6:

Re: Shaft drive bike motors
 

Dwarf cars and Legends use chain drive bike motors, swapping out the gear for a coupler that attaches to the driveshaft. The motors sit longways in the car and the shaft runs down the right side of the driver. If you mounted the shaft drive motors the driveshaft would run down the drivers side - probably a weight distribution issue moving the drive to the right, but also a safety issue, as the driver would have to exit on the passenger (wall) side. Dwarf car manufacturer 'Jaxports' created a harley powered street version of a dwarf that was featured in Car and Driver (http://www.caranddriver.com/reviews/...specialty-file) - unfortunately no good photos of the driveline. Lots of rumors of harley powered dwarfs being built back in the nineties but nothing ever came of it; I think Bob's right, for the money nothing beats the 4 cyl.

Re: Shaft drive bike motors
 

If you wanted it to run and be fast it def wouldn't be a junk harley motor! I always thought a v-twin would be cool in a tq I believe hankins tried it a long time iirc. 4 cylinders are very hard to beat for the overall power and smoothness. I kinda wondered about a sled or jetski motor that doesn't have a transmission to eliminate, but the cc would probably be too much.

Re: Shaft drive bike motors
 

As far as Mini Sprints are concerned, I think you will find that most associations require chain drive.

Bill

Re: Shaft drive bike motors
 

Terry Farrar tried a Harley in a TQ in California back in the mid-eighties; it had one Hilborn stack sticking straight forward and was so loud it hurt your ears.
If I remember right, one of the biggest problems was that it kept breaking the frame...

Re: Shaft drive bike motors
 

I did run a V-Max back in the early 90's. We had a chain adaptor built off the side off the transmission and ran mechanical injection. Those parts may still be around. It made good torque but would be way down on HP compared to new 1000's.