Shaft drive bike motors

TQ29m · 2/16/13, 9:50 AM

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

PatrickMead#13 · 2/16/13, 2:17 PM

It sure would sounds cool tho... Lol

Posted via Mobile Device

sprintracer82 · 2/16/13, 2:54 PM

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!

DAD · 2/16/13, 3:43 PM

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.

Honest Dad himself

WBR 3E · 2/16/13, 11:40 PM

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.

badcoupe · 2/16/13, 11:59 PM

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.

Bill84 · 2/17/13, 7:59 AM

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

Bill

jjones752 · 2/17/13, 10:00 AM

Quote:

Originally Posted by badcoupe

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.

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...

teamfds · 2/17/13, 11:55 AM

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.

2/16/13, 9:50 AM	#11 Re: Shaft drive bike motors
TQ29m Senior Member Join Date: Aug 2008 Posts: 6,649	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 __________________ "Being old, isn't half as much fun, as getting there"! Ole Robert I!

2/16/13, 3:43 PM	#14 Re: Shaft drive bike motors
DAD Senior Member Join Date: Aug 2009 Posts: 5,957	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. Honest Dad himself _________________________________________________ Last edited by DAD; 2/16/13 at 3:49 PM.

2/16/13, 2:17 PM	#12
PatrickMead#13 Senior Member Join Date: Sep 2010 Posts: 954	It sure would sounds cool tho... Lol Posted via Mobile Device

2/16/13, 2:54 PM	#13 Re: Shaft drive bike motors
sprintracer82 Senior Member Join Date: Oct 2007 Posts: 534	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!

2/16/13, 11:40 PM	#15 Re: Shaft drive bike motors
WBR 3E Member Join Date: Nov 2009 Posts: 218	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.

2/16/13, 11:59 PM	#16 Re: Shaft drive bike motors
badcoupe Senior Member Join Date: Aug 2008 Posts: 1,005	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.

2/17/13, 7:59 AM	#17 Re: Shaft drive bike motors
Bill84 Member Race Count This Year: 17 Race Count Last Year: 13 Join Date: Nov 2008 Posts: 172	As far as Mini Sprints are concerned, I think you will find that most associations require chain drive. Bill

2/17/13, 11:55 AM	#19 Re: Shaft drive bike motors
teamfds Member Join Date: Feb 2013 Posts: 43	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.