chrisg
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| posted on 4/9/05 at 11:11 AM |
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Bike engine diff connection.
Hi all,
after a lengthy philosophical (i.e drunken) discussion yesterday, I thought I'd ask you, the great unwashed, this question.
Is it possble to attach a bike engine via the usual sproket adaptor directly to a diff, like a Sierra diff with out an intervening
propshaft?
That is sprocket adaptor bolted to diff flange.
to make a compact mid-engined set-up.
I think it would work as both the engine and the diff would be bolted solid to the chassis.
Go on, shoot me down in flames!!!
Cheers
Chris
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suparuss
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| posted on 4/9/05 at 11:28 AM |
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i remember asking this a couple of years ago. i think the general concensus was that it would be a bad idea. youd need something flexible between them
as it would be difficult to ensure no movement occurs between engine and diff. due to chassi flex, slight play on moutings etc) if there is there
would be a lot of stress on the shafts.
i think you could probably get away with an early typt cv joint which is made mostly of rubber and therefore can flex in all directions and would be
quite compact. a single solid type cv joint is out because they only allow twist and bending, but not parralel movement.
Russ.
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Cita
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| posted on 4/9/05 at 03:04 PM |
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What if you would mount a flange on the diff that has, let's say 5, high strenght bolts with the same diameter as the notches in the
sprocket,the bolts would replace the chain and there would be enough play to deal with flexing of the chassis.
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suparuss
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| posted on 4/9/05 at 03:54 PM |
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another point tho is the shock when changing gear on a bike, if there is nothing to take it then the gearbox will take a right beating. needs a cush
drive or something as well.
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chrisg
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| posted on 4/9/05 at 07:17 PM |
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What about engine/cush drive/diff then?
I didn't think there'd be that much movement with the engine and the diff both bolted up solid.
Cheers
Chris
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JoelP
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| posted on 4/9/05 at 07:27 PM |
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i think that the combo of engine movement and any slight inaccuracies in the mounts would ruin stuff in the end. But a simple cush or u/j in the
middle would be perfect. Indeed, its been done many times.
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chrisg
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| posted on 4/9/05 at 07:32 PM |
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Has It?
Show me!
(come on, you've nothing better to do)
Cheers
Chris
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Rorty
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| posted on 5/9/05 at 08:17 AM |
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It has definitely been done before, but I don't have photos of it.
There are several options of adjoining the engine with the diff. I posted ages ago about using a readily available industrial PU star cush drive.
Lots of industrial equipment is cojoined using various couplers including wrapping a short length of duplex chain around the sprocket on the power
supply and an identical sized one on the shaft (diff flange in this case). The double row chain allows for small amounts of mis-matched alignment, yet
is very direct.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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phil_far
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| posted on 5/9/05 at 03:37 PM |
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The Sylvia Stylus mid engine bike use a Sierra/Freelander differential with a cush drive.
And no you can not bolt the engine directly with the differential unless your chassis have been welded on a jig adn all teh mounts CNC machine sfrom
the same datum.
Cheers
Philip
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