Two Engines Back Driving One Differential.

[Angel And The Wolf]

Even with paddle shifters, these ratios are way too close. That's why I'm giving up on this idea. It might be useful in racing, but only with some automatic element to it. Shifts come too quick:

[cRiPpLe_rOoStEr]

If you could easily convert the motorcycle transmissions for an H-pattern instead of sequential, that would be interesting as it would effectively allow skip-shifts.

Originally Posted by Frank Lee

I don't get it, but then I'm a flatlander. I want three gears, top "gear" being direct drive: no power flowing through gearsets. And I don't want to spend a lot of time shifting. Hell, even with 5-speed trannys I skip shift.

Motorcycle engines are a whole different animal. Had it been a more conservatively-designed American car engine with a good amount of low-end torque (even if it was meant for a compact like the GM Iron Duke engine), then a good old three-on-the-tree would be enough at most circumstances, not only flatland.

[Angel And The Wolf]

OK, one more thought:
One engine, One transmission, Two output sprockets, each feeding one side of a Spur Gear Differential, with dogs on the front sprocket of one side able to disengage that side, and a disc brake caliper on the rear sprocket of thet side to hold that side shaft from turning when the front sprocket is disengaged. Differential feeds rear wheel by sprocket on the carrier case.

Speed in ratios would be:

Left/Right Feeds-------Final Ratio--Top Speed
1/1-----------------------13.990 --- 47 mph
2/2 ------------------------9.540 --- 69 mph
3/3 ------------------------7.450 --- 88 mph
1/Disengaged, braked ---6.995 --- 94 mph
4/4 ------------------------6.140 -- 107 mph
5/5 ------------------------5.260 -- 125 mph
2/Disengaged, braked ---4.770 -- 138 mph
3/Disengaged, braked ---3.725 -- 176 mph
4/Disengaged, braked ---3.070 -- 214 mph
5/Disengaged, braked ---2.630 -- 250 mph

I have not taken into consideration Differential Ratio, but that can be handled
by choosing proper larger front/smaller rear sprocket pairs.

[Angel And The Wolf]

Originally Posted by cRiPpLe_rOoStEr

Had it been a more conservatively-designed American car engine with a good amount of low-end torque, then a good old three-on-the-tree would be enough at most circumstances, not only flatland.

I've seen some old Harleys with stick shifts. Takes forever to grab the next gear!

[Angel And The Wolf]

Comparing CB750 gears to CB750 + Differential

2 in/1 out----Standard CB750
47 mph-------------47 mph
69 mph-------------68 mph
88 mph-------------87 mph
94 mph
107 mph-----------106 mph
125 mph-----------123 mph
138 mph
176 mph
214 mph
250 mph

[Angel And The Wolf]

The idea:

[arcosine]

Just buy a Prius, it already has two engines and a differential.

[Angel And The Wolf]

I have a Prius. I want a trike.

[arcosine]

Id be better having two transmissions and one engine. A differential splits torque equally, 50/50, so each engine would have to have the same torque output, otherwise one would drive the other, and therefore the work is lost in the weaker as the stronger engine pushing the weaker to equalize the torque.

Originally Posted by Angel And The Wolf

I have a Prius. I want a trike.

[Angel And The Wolf]

Tony, I've given up on this idea. The shift points are too close together.
This is my new idea:
https://ecomodder.com/forum/showthre...ars-36772.html