http://link.brightcove.com/services/player/bcpid1119137831?bctid=28718232001
Now to start my homebrew 2wd project 
Looks easy enough, though I would probably try to run the hydraulic pump off the rear wheel to allow easy ratio changes.
http://link.brightcove.com/services/player/bcpid1119137831?bctid=28718232001
Now to start my homebrew 2wd project Looks easy enough, though I would probably try to run the hydraulic pump off the rear wheel to allow easy ratio changes.
xci_ed6 wrote: http://link.brightcove.com/services/player/bcpid1119137831?bctid=28718232001 Now to start my homebrew 2wd project
Add a hydraulic cylinder to add regenerative braking, then I'll be impressed.
no lap times between one wheel drive and awd? has to be some loss in the system nothing works 100% efficency. I love to try it off road on a dual sport
christini makes kits for off road, www.christini.com
I'm not sure that i see the point of this?
From what I understand it makes those rear tire grip loss situations less scary the front wheel continues to pull you through the turn thereby keeping things rubber side down.
93celicaGT2 wrote: I'm not sure that i see the point of this?
Ride a 1L sportbike. If the front tire is down, the back tire is spinning.
wherethefmi wrote: From what I understand it makes those rear tire grip loss situations less scary the front wheel continues to pull you through the turn thereby keeping things rubber side down.
The hydraulics are essentially a mechanical linkage, I believe both [the pump & motor] are positive displacement anyway. That would mean the front & rear are always going to be spinning the same speed, so you would not be able to spin one without spinning both, so like 50% more traction.
They talked about an increase in efficiency. But they didn't show any evidence. Um, let's see. Let's add mass in the form of a motor, hydraulic lines, and a pump; then let's add in all of the parasitic drag of the motor and the pump; and then somehow, we have better efficiency than if we just drove the rear wheel? Sure. I'll take your word for it. Not.
In his defense: 1.) that is the coolest berkeleying thing I've seen on a bike since they came out with those colored streamers that you put on your handlebars, and 2.) I can see how it might help your fuel efficiency off road by putting more power into moving the bike instead of just spinning the wheel. OK, and 3.) I can see how the point above makes this thing just a whole world better for big power makers.
Pretty cool!
confuZion3 wrote: They talked about an increase in efficiency. But they didn't show any evidence. Um, let's see. Let's add mass in the form of a motor, hydraulic lines, and a pump; then let's add in all of the parasitic drag of the motor and the pump; and then somehow, we have better efficiency than if we just drove the rear wheel?
I'll agree there, nothing gets more efficient when it gets heavier and more complicated.
this technology debuted on dirtbikes many years ago, an application where it actually made a little sense. its stupid and pointless on a sportbike, IMO. If you can't handle a liter bike there is traction control or smaller bikes. I don't think this would actually make it any faster. Wheelspin isn't really the limiting factor on a sportbike.
This would be very usefull on heavy wieght off-roaders and dual-sports, especialy Dakar Rally type bikes, but it seems pointless for a sport bike. How can adding weight and annother layer of complexity improve performance on a road bike? I am impressed at how compact the system is. I'll bet that hydraulic oil gets really hot really fast though.
To quote Ben Rich, former head of Lockheed's Skunk Works: "How could Lockheed build something like the SR-71 Blackbird? We weren't afraid to fail."
Without giving it a try, we won't go any were.
andrave wrote: this technology debuted on dirtbikes many years ago, an application where it actually made a little sense. its stupid and pointless on a sportbike, IMO. If you can't handle a liter bike there is traction control or smaller bikes. I don't think this would actually make it any faster. Wheelspin isn't really the limiting factor on a sportbike.
I beg to differ, that's why they've implemented traction control on moto gp bikes. Say what you want I'd love it on a street bike.
If you lose traction with one wheel, you are still steering, lose traction with both wheels? Similiar but different, who leaves the road big time when it snows? The 4WD vehicles. A regular car just gets stuck.
Think about this the front wheel is doing 3 things already, the rear is doing 4, might as well even the load.
I think a really cool concept would be a FWD bike, but that's just me. The christini system has a mechanism that only powers the front when the rear loses traction, I would imagine the ohlins people have devised something similar for their system.
Read this 2WD The Complete Story
confuZion3 wrote: that is the coolest berkeleying thing I've seen on a bike since they came out with those colored streamers that you put on your handlebars
what, youve never seen those colored plastic things that slide up and down the spokes and make noise as the wheel spins?
4cylndrfury wrote:confuZion3 wrote: that is the coolest berkeleying thing I've seen on a bike since they came out with those colored streamers that you put on your handlebarswhat, youve never seen those colored plastic things that slide up and down the spokes and make noise as the wheel spins?
I stand corrected. Touché.
I think a hydraulic fluid leak on the front tire would make things pretty interesting, pretty quickly...
doc_speeder wrote: I think a hydraulic fluid leak on the front tire would make things pretty interesting, pretty quickly...
Well....yeah! 
Same as a brake fluid leak or a fork oil leak.
Xceler8x wrote:doc_speeder wrote: I think a hydraulic fluid leak on the front tire would make things pretty interesting, pretty quickly...Well....yeah!
but those leaks don't spray out gallons of hot oil under high pressure!
HappyAndy wrote: but those leaks don't spray out gallons of hot oil under high pressure!
You got me there. Course, neither does armor-all but put it on your front tire and try to take a turn and we'll talk. Right after we're done pulling the gravel out your hide.
The one good thing about this invention...watching some squid try to do a wheelie, backwards.
Xceler8x wrote:HappyAndy wrote: but those leaks don't spray out gallons of hot oil under high pressure!You got me there. Course, neither does armor-all but put it on your front tire and try to take a turn and we'll talk. Right after we're done pulling the gravel out your hide.
I wanna see a liter bike doing an awd burnout/peelout... :P
Why not drive the rear wheel that way to? Think of how awesome you could make a bike look with no chain, belt, or driveshaft. Think of the efficiency?
So do it!
There is some merit of what you're saying from a styling exercise stand point. The chain has some advantages in a performance application in that you can change ratios at will depending on the track or application. It would be harder to do that with a hydraulic pump. You could argue that you could change the pump speeds, etc, etc but I'm not a fluid dynamics person so I'll leave that to others to debunk/advocate.
There are also plenty of alternatives to a chain drive.
Shaft - shut yo mouth! I'm just talking 'bout Shaft baby!
Belt drive ala Buells
There might be others but those are the most prevalent.<img
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