LabRat, following your build for quite some time. It's impressive to say the least.
Thought you'd enjoy seeing this build by a friend!
Information about this Twin Engine Schwinn Stretched Chopper Bicycle Build, pedals removed:
That blue bar is temporary since the engine mounts are not completed in this picture. When the bottom mounts are complete, then a top mount between the two heads and the backbone pipe will be fabricated. A chain guard will fasten into that blue bar area, and that aluminum sounds like a good idea. The bases of the engines are as close as they can get mounted in the V shape, I even changed the oil drain plugs to short allen wrench types to get them as close as possible
LabRat:
The engines are locked together and timed so the second engine fires 315 degrees after the first engine fires. The second engine has a cent. clutch that drives a jack shaft in the opposite direction of the engines and then goes to the back tire. That's right, the engines as you look at the picture rotate counter clockwise and the back tire has to rotate clockwise. That was a surprise I had to deal with, never thought about the engines running backwards with the way I wanted to mount them. As for the pipes, I like them the way they are. Actually I built the front pipe first around the front crank shaft and then the back one that had to clear the clutch. Their shape has more to do with where there was room to put them than what I would like them to look like. Would have been nice to have the identical. The front one could be reshaped a little bit, but not much.
The seat pan is cut out but not shaped, the original rear fender will get all the holes filled and be remounted. Two ideas for a tank, one is to cut the backbone out and replace it with a 3" or 3 1/2 " tube and use that for the tank. That would retain the original bicycle look and hold about a gallon, the other is about an 18" long slender "coffin" shape tank that will hold about a gallon and go on the frame as it is now. As for controls, I have a throttle twist grip to make it go and a new pair of boots I can drag to get it stopped, what else do you need? Actually I'm researching a disc brake that I'll need to turn a hub for to attach to the back wheel, or possibly just the original caliper brake. Sorry, but I don't make sketches on paper very often, mostly ideas that just develop as I go.
The motors are 3 hp Tecumesh. They have plenty of power if necessary can a smaller sprocket on the rear wheel to increase the ratio. Top Speed about 30 pmh in the current configuration and 45 mph if using the smaller sprocket.
The engines are pull start. The engine mounts finished now (made a change in that plan) and seem to be sturdy enough that the top mount off the heads to the backbone is no longer in the plan. The 315 degree is for sound, Harley type. Harley cylinders are 45 degrees apart, the front cylinder fires at 0 degrees, rotates 315 degrees, then the back cylinder fires, then rotates 45 degrees to complete the 360 degree circle.
Crazy Horse.
