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Old 04-09-2018, 05:10 AM   #11 (permalink)
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I think I'll go back to parallel power plant/gear sets:
No over-stressed transmission, that way.

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Old 04-11-2018, 02:12 PM   #12 (permalink)
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I'm thinking of employing some form of lean steering. Would I need to design in something like Ackerman geometry? (see illustration)
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Old 04-13-2018, 04:25 PM   #13 (permalink)
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I see now that you said "two stock" not "two stroke" ... I was going to point out that they're four stroke engines but glad I didn't now

Everyone says the old Honda bikes' transmissions are indestructible. So far, in my experience, they're correct. But that's on a bike with 20 hp.

Go for it!

I have a '78 cb750 in my garage in a million pieces and waiting to be put back together. One day it will be!

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Old 04-13-2018, 04:31 PM   #14 (permalink)
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What if the two engines were connected together with a planetary gear box? Might make it a lot smoother. I think that Priuses use such a thing to combine the gas and electric engines together (and it's pretty brilliant as the electric can start the gas engine, and it replace the transmissoin all together some how)

You could find a cheap open-differential rear end from a muscle car or truck. Maybe it could even be the front axle from a 4x4. Except the power would be going backwards - from the axles to the yoke. And the gears are not cut to be operated that way. Is it the same as driving in reverse though? I know that the front axle on my jeep is a "high pinion" as opposed to a low pinion, and gears are cut in reverse for this to be possible. Something to think about maybe

Of course that would add a lot of weight as they're encased in cast iron...

...and it would throw off the gearing.

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Old 04-13-2018, 07:17 PM   #15 (permalink)
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I have a Gen 3 Prius, and I think the two electric motors are connected to two different elements of the planetary unit. Varying the speeds between the two gives the variable output. Yes, I thought about connecting each CB750 to different half axles of a rear end unit, and allowing each engine to be shifted independently. I came up with 11 different output ratios (see chart) (IF my reasoning is sound) but I really want to keep the engines in sync, 90 degrees apart, for the smoothness and sound.
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Old 04-14-2018, 07:04 PM   #16 (permalink)
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And here's a neat thing about joining the two at an intermediate shaft with chains. If I synchronize the second engine 45 degrees apart (instead of 90 degrees apart) from each other, the sound will be like a Harley. (if that gets you off,) instead of a 90 degree V8.
Of course, with a redline of 8000 RPM, you will get a harley sound like a single harley engine at 3 times the redline, (16,000 vs 5,400)
and with the engines 90 degrees apart, you will get a CB750 sound at twice redline (16,000 vs 8,000)

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Old 04-14-2018, 08:34 PM   #17 (permalink)
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I don't see info on application...a lovejoy coupler would work in a side x side setup.
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Old 04-15-2018, 03:48 AM   #18 (permalink)
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Yeah, here's the diagram on how the two engines would be tied together. All three sprockets on the intermediate shaft are splined. The one clutch pedal operates both clutches, and push buttons send a signal to solenoids on both gearshift levers, left push button for upshifts, right push button for downshifts.
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Old 04-15-2018, 04:15 AM   #19 (permalink)
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I bet a single clutch would work. Plenty of those motors were drag raced , I'm sure you could find heavy duty springs and better than stock clutch plates. My idea of the lovejoy coupler attaches both cranks with rubber isolation of the coupler. Problem would be crank adapters strong enough to handle to torque from the isolated engine. I would love to build or buy a reverse trike, good luck with the build. With a jack shaft setup you could put one engine in neutral at cruising speeds for better economy.
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Old 04-15-2018, 04:23 AM   #20 (permalink)
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I wouldn't mess with leaning steer, might make steering heavy.
Using the jack shaft you also have the ability to add another transmission, Harley 4,5 or 6speed. Tune one engine for max effeciency at cruise rpm...

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