Aico
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| posted on 15/6/07 at 07:31 PM |
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Bike gearbox swap
Is it possible to fit a bike transmission to a car engine? What would you need to build to make it fit? I know how the car setup looks like, but I
can't seem to find much good info about the bikes. On pics I can see the transmission being a 1 piece with the engine. Is this right or can you
seperate them?
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DIY Si
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| posted on 15/6/07 at 07:37 PM |
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They tend to be an all in one job. The entire case splits in half normally, so there isn't a gearbox casing as such.
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ChrisGamlin
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| posted on 15/6/07 at 07:51 PM |
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Most are all in one with the engine as Si says, so unless you have a CNC machine shop to manufacture your own gearbox casing to hold all the gearsets
and mate up to the car engine, its not possible Im afraid.
The only exceptions I can think of are some BMW bikes which have seperate gearboxes, but you still wouldnt be able to fit it to a car engine very
easlily at all, and I doubt it would take the torque output anyway.
[Edited on 15/6/07 by ChrisGamlin]
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ScotJebus
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| posted on 15/6/07 at 08:14 PM |
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you wont be able to get a bike gearbox onto a car engine without a vast amount of work. If you are after the tap forward to go down and pull to go up
gear change (sorry cant remember name for this type of gear box) then you can get them for cars. I know that you can get them in a type 9 from burton
power, but they will cost quite a lot.
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Aico
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| posted on 15/6/07 at 09:03 PM |
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Sequential gearboxes for car engines are very, very expensive. You can sometimes get a used one for maybe 3.000 pounds, but this is just too much.
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mark chandler
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| posted on 15/6/07 at 09:38 PM |
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Alternative is to get an electronically controlled auto gearbox, you can frig these to tiptronic use
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Aico
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| posted on 15/6/07 at 09:44 PM |
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That might be a solution. What gearboxes from what cars can I use? Also what is involved with those gearboxes? Does it need a lot of electronics or is
it a simple switchlike system?
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Bob C
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| posted on 16/6/07 at 01:12 AM |
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I'm sure I heard of a sequential "shifter mechanism" to bolt on the BW T5 box (as found on sierra cosworths and lots of american
cars). Never seen one though
Bob
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bimbleuk
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| posted on 16/6/07 at 05:15 AM |
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As Bob says I read about one too ages ago but never found much about it since.
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russbost
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| posted on 16/6/07 at 12:37 PM |
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Didn't BMW bikes have a separate gearbox like the old Nortons & Triumphs etc? Even if so don't know if it would stand tuned car engine
torque?
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mark chandler
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| posted on 17/6/07 at 08:54 PM |
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Chrysler torque flight was one, also Borg warner 63/64.
You can get the 'autoness' removed and just select gears, trouble is only 3 speed auto boxes.
I believe that the layer zf auto boxes also have a box of tricks which control the shifts, but whatever it going to be expensive.
Better off with a bike engine complete and a full power shift kit for £150.
Regards Mark
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chunkytfg
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| posted on 18/6/07 at 11:14 AM |
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most bike gearboxes as pointed out are incorperated into the crankcases however there are exceptions.
Of the top of my head moto guzzi's and some of the larger BMW's have a proper bolt onto the back of the engine type gearbox much like
you'd fit to a RWD car. They are also shaft drive so fitting a propshaft whoud be relatively easy.
Either that or some of the massey furegesso........sorry i mean harley davidsons have seperate gearboxes from the engines with a ~4" rubber belt
transfering the power from engine to gearbox. IMO i wouldnt even consider this option though if only because i cant stand HD's
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