Volvorsport
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| posted on 11/11/07 at 12:28 PM |
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Gear Ratios ?
are bike gear ratios like cars (obviously closer) ie they have a gear thats direct drive ie 1:1
www.dbsmotorsport.co.uk
getting dirty under a bus
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Crazy Eddie
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| posted on 11/11/07 at 01:56 PM |
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Have a look here might have info you need: Gearing
Cheers
Eddie
www.EdwardsSchoolOfMotoring.co.uk
For online shopping that earns you money  : Ei42.com
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ChrisGamlin
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| posted on 11/11/07 at 02:10 PM |
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Bikes engines dont generally get near a 1:1 ratio in relation to engine RPM and output shaft rpm, because they have a reduction ratio between the
crank and the clutch, usually around 1.5:1 - 1.7:1.
Top gear itself is often around the 1:1 mark though in relation to the clutch RPM, which would obviously be ~ 1.5:1 if compared to the crank RPM.
Chris
[Edited on 11/11/07 by ChrisGamlin]
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Bob C
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| posted on 11/11/07 at 03:40 PM |
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also I think in general the output is effectively on the layshaft, so every ratio goes through 2 sets of cogs - 1) primary reduction and 2) selected
gear
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Volvorsport
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| posted on 11/11/07 at 04:18 PM |
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so the output shaft spins faster than the engine , hmm that could work , teh othe rway round might scupper plans .
www.dbsmotorsport.co.uk
getting dirty under a bus
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ChrisGamlin
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| posted on 11/11/07 at 07:45 PM |
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Nope the other way around, the crank spins faster than the output shaft.
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Peteff
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| posted on 11/11/07 at 08:02 PM |
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so the output shaft spins faster than the engine
If the engine is spinning at 11,500rpm a 1:1 gear would give you top speed of about 240mph wouldn't it. That would be some car 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Volvorsport
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| posted on 12/11/07 at 11:08 AM |
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hmm i see , with a diff and small tyres , might be a bit less than 240mph !
im try to get this in front of some CVT belts , if i could id do away with the bike gearbox altogether , thats why i looked at BMW engines , but i
dont think its gonna be possible .
might just have to junk the CVT bit .
[Edited on 12/11/07 by Volvorsport]
www.dbsmotorsport.co.uk
getting dirty under a bus
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chrisf
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| posted on 12/11/07 at 01:36 PM |
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quote:
Originally posted by Volvorsport
... thats why i looked at BMW engines , but i dont think its gonna be possible .
might just have to junk the CVT bit .
[Edited on 12/11/07 by Volvorsport]
Not so. Have a look at the Yamaha RX-1. It is a snowmobile engine that is based on the R1 bike engine. It has slightly less horsepower than the bike
engine, but also has the CVT standard. Were i brave enough or hand the machining tools at my disposal, I would have a go at a CVT car myself. Getting
that CVT right would be tricky though.
--Chris
[Edited on 12/11/07 by chrisf]
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