In reply to Autolex:
Simple and light is the theme,adding a car tranny to a bike enine is ridonkulous-can't believe someone thought that was an improvement.
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April 5, 2010 2:50 p.m. kevlarcorolla New Reader
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April 5, 2010 2:56 p.m. kevlarcorolla New Reader
In reply to Don49:
I've thought about this route as well,seems to me it would be much simpler to simply have the starter work as intended on a gear so a belt isn't running there loose when not needed.Saves building more weight adding levers and tensioners etc. All I was really looking for was a possible source for the gear,the rest is easy.McMaster-Carr has the gear but not in a big enough diameter nor locost enough.
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April 5, 2010 3:46 p.m. erohslc Reader
In reply to kevlarcorolla: Yeah, you'll feel that way until about the third time you have to replace the bike tranny ...
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April 5, 2010 5:01 p.m. kevlarcorolla New Reader
In reply to erohslc:
As a biker(sports,not that cruiser stuff)and a guy thats spent the last 10 months immersed in 7 ,locost,dsr,dwarf and any other 4 wheeler that uses a bike engine forums you'd think if it was a problem it would be well documented.Not the case however. Whats dumb about going to all the trouble to mount a miata tranny to the bike engine is that the engine is already mounted the correct way to install an $80 adapter in place of the sprocket and run a driveshaft to the diff. The only way a bike engine makes sense to me is if the car weighs less than about 1200lbs,and even thats pushing it.
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April 5, 2010 8:00 p.m. oldopelguy Dork
ACVW or Audi transaxle wouldn't weigh a whole lot more than the Miata differential mounted back there, and imagine the autocross fun putting the rear trans in 2nd or 3rd and being able to use all your gears and wind out the bike engine.
Some motorcycle starters are chain driven. Might be able to use a sprocket on the pinion of the dif and get it going. Same goes for the belt driven starter/generator units for lawn tractors.
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April 5, 2010 8:22 p.m. Jensenman SuperDork
44Dwarf wrote:
I've seen a 12hp mower motors ring gear off the fly wheel used and the 12v starter ring gear was bolted to the pinon yoke with a bracket fabed to hold the starter.
I think we have a winnar.
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April 6, 2010 6:05 a.m. 44Dwarf HalfDork
Ya it was a nice set up the starter had a bendix on the end so your not driving the starter unless your using the rev. As an added plus one could use the teeth on the ring gear and a hall-efect sensor as a speed-o-meter. Motr bike motors get the signal off the output shaft / counter shaft sprocket. With a little work you could make the bike dash read the right speed.
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April 7, 2010 5:39 p.m. kevlarcorolla New Reader
Buddy of mine has a blowed up 12hp motor out back,gonna check that out shortly.
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April 7, 2010 6:44 p.m. Giant Purple Snorklewacker SuperDork
How about using a belt and pulley - have the driveshaft cut and weld the pulley between the diff and the flange, mount the starter (using an alternator pulley to bring the gear way down) to the chassis and add a tensioner.
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April 7, 2010 6:47 p.m. Giant Purple Snorklewacker SuperDork
A timing gear and belt / chain would also work
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April 7, 2010 8:06 p.m. kevlarcorolla New Reader
In reply to Giant Purple Snorklewacker:
If you go with a belt,timing gear and chain you need to figure out a way to not having the starter running backwards all the time.
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April 7, 2010 8:21 p.m. Giant Purple Snorklewacker SuperDork
kevlarcorolla wrote:
In reply to Giant Purple Snorklewacker:
If you go with a belt,timing gear and chain you need to figure out a way to not having the starter running backwards all the time.
I assumed you would use the starter solenoid to engage the alt pulley - it could even be as simple as a bolt (think rifle or door not hardware) if the ability to fabricate stuff is limited.
A magical idea involving a one-way slip (ala bicycle rear hub) just occurred to me... although that is a lot of rolling friction for a little gain. His reverse only has to work once in tech to qualify.
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April 8, 2010 4:35 p.m. kevlarcorolla New Reader
The 12hp flywheel looks doable once most of it is paired away in the lathe,the starter however doesn't seem to have enough jam.Going to investigate the possibility of transfering the 12hp starter gear onto the honda starter as the drive angles/pitch are completely different.
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July 24, 2010 8:40 p.m. avendlerdp New Reader
kevlarcorolla wrote:
In reply to erohslc:
As a biker(sports,not that cruiser stuff)and a guy thats spent the last 10 months immersed in 7 ,locost,dsr,dwarf and any other 4 wheeler that uses a bike engine forums you'd think if it was a problem it would be well documented.Not the case however. Whats dumb about going to all the trouble to mount a miata tranny to the bike engine is that the engine is already mounted the correct way to install an $80 adapter in place of the sprocket and run a driveshaft to the diff. The only way a bike engine makes sense to me is if the car weighs less than about 1200lbs,and even thats pushing it.
Hey Kevlar- Read the article about the Miatabusa project on MotoIQ. Bike engined cars are a great idea but the constant mesh dog box is NOT workable for long term use. As a owner of an endurance race car powered by a CBR1000RR engine I can tell you fist hand that the tranny is good for no more than 30 hours of race use. Dwarf cars don't shift during races so it's not an issue and even if they did a whole season of Dwarf car racing puts probably less that 20 hours on a car. It's well documented in the BEC world that the transmissions are a bit on the weak side. Besides that, by the time one adds in a proper reverser box, there are no weight savings to speak of. Remember, the Miatabusa setup allows for the removal of the bikes trans and clutch assembly. Weight savings. Take a good hard look at what's going on there and it will become clear that there are some pretty good ideas in play.
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July 25, 2010 1:21 a.m. AquaHusky New Reader
Wasn't this very question already answered with the Berzerkley? They made a diff with a reverse gear so it had 6 forward and 6 reverse speeds. Read it in an issue of this forums magazine. Volume 25, number 6, from October of 2008. Hope this helps with ideas.
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July 25, 2010 8:02 a.m. minimac SuperDork
I saw one that had a HF winch. A pulley and belt system and a way to engage/disengage. I didn't study it, but it was more effective(faster) than the starter motor system on my Goldwing.
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July 25, 2010 9:49 a.m. avendlerdp New Reader
Oh, one more thing. Most if not all shaft drive bikes shafts turn the wrong way. The z600 has a custom reverser box to flip the rotation.
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Oct. 3, 2010 7:49 p.m. yahshuatwo
I'm developing a reverse gearbox for BEC applications and plan to do a small production run soon if you're in the market. My web-site isn't up yet but hopefully soon after completing trial run testing. You can go to locostusa.com under Bike-engined builds or search youtube for pictures. My introductory price will be right $1000.00 and made in the good old U.S.A. I'll probably offer a turn-key solution for the price above and kit for a little less..
Ryan
