The Tidal Force actually looks good and lightweight!http://www.myebike.com/bikes/S-750XTidalForce.htmlDAMN THIS THING ONLY WEIGHTS IN AT 75lbs!!! MY FIRST BIKE WAS 135lbs!


Thats not the one I saw in San Fran though, those were not very good looking....

 

lol well I guess I should have made it clear when I talk about electric bicycles I meant one that didn't have any sort of battery

Nice bikes though!

 

Didn't need to quote the whole thing. The pump efficiencyis what's in question, not the drive. The stock water pumps are not as efficient as many aftermarket units, especially those used for electric drive. It has to do with the vanes and housing. If you convert the electric driven pump back to belt drive, you'd be better off.

You don't need a lot of RPM to drive a generator to drive an electric motor. Just a generator with the right voltage and current. And, yeah, have fun pedalin' that generator to run the motor to run the tire.

 

There is an electric scooter too! lol
And those are just the top search results I found.

Now as the efficency of the water pump, it doesnt make a difference as long as the temperature is governed properly, force too many gph in and you can get cavitation under those pressures. Another thing to be though of is when they test water pumps and get i dunno 160gph they are doing a test that is connected to two tubes, inlet and outlet.... There is no restriction to them, for that water to travle that winding path through the engine will slow it down a ton, not to mention the interior walls are covered with scale (Except aluminum which could still be contaminated by buildup.)

There isnt too much efficiency out of it if the pump is made to do 160gph and can onlypush 120gph, you follow what I am saying? Im not saying that all engine's water paths are the same, but thats a good broad disgussion.

$2800 for that bike is a bit much though
I like the Iron man which is a $1400 dollar bike, all titanium, 3 peice driveshaft, 28 gears, can be fitted for different ratio's like 12 - 18 - 21 speeds. Front and rear 10" Disk brakes, titanium rims. I think the whole bike weights something like 35lbs.

I break bikes all the time because I pump the **** out of them. I had to switch to a 3 peice shaft because I couldnt repair the others and it was becoming more expensive.

 

You completely missed it. Heck, you're in the wrong ballfield.

Think "vanes" and "cavities" not GPH. An efficient pump will move more fluid while requiring less power. The most visible example would be the several variations of fans designed to move air.