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Author Topic: CVT a bike engine  (Read 13292 times)

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Re: CVT a bike engine
« Reply #75 on: January 03, 2009, 10:40:00 AM »
I dont think you can get the countershaft speed to 6500, if you could i think it would work, it would be a bitch to tune at first, but once had it would be sweet...
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Offline fabr

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Re: CVT a bike engine
« Reply #76 on: January 03, 2009, 10:40:34 AM »
Of course it's centrifugal force controlled and that is adjusted with different cams and weights.There's no reason I know of why you can't get the same reduction range at 6500 as you would have with 8500 rpm that I know of. All it takes its the correct balance .
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Re: CVT a bike engine
« Reply #77 on: January 03, 2009, 10:42:19 AM »
on a gixxer 600 at 11000 rpm, the primary reduction is already...5800..
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Offline fabr

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Re: CVT a bike engine
« Reply #78 on: January 03, 2009, 10:43:06 AM »
Busa-11500K divided by 1.596=7205 off the CS. What's the problem?.
Smaller motor-higher rpm/primary reduction gives a similar CS rpm.The 600 redlines much higher than 11000
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but something else also, isn't an American at all.  We have room for but one
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the English language... and we have room for but one sole loyalty and that is a
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Re: CVT a bike engine
« Reply #79 on: January 03, 2009, 10:44:42 AM »
Possible, as it will lower the inital engagement dramticly as well, at 1500 rpm idle the cvt would be turning 800 rpms, so at 4000 engine rpms you could have engagement at around  2200 this is just primary redcution tho, still have to factor in 6th gear reduction...
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Re: CVT a bike engine
« Reply #80 on: January 03, 2009, 10:46:20 AM »
Quote from: Masterfabr on January 03, 2009, 10:43:06 AM
Busa-11500K divided by 1.596=7205 off the CS. What's the problem?.
Smaller motor-higher rpm/primary reduction gives a similar CS rpm.The 600 redlines much higher than 11000

i agree, but imagine running everywere at 13500 rpm, they make power around 10500 go over and your waisting it...Whole idea behind a cvt to is to get to maximum engine torque and maintain it thoughout the shifft range....
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Re: CVT a bike engine
« Reply #81 on: January 03, 2009, 10:47:22 AM »
so basicly i would want the engine rpms to come to 10500 until i have full shift out of the cvt, then let the rpms climb to redline...
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Re: CVT a bike engine
« Reply #82 on: January 03, 2009, 10:49:03 AM »
Sorry, one more, 600 primary reduction is 1.87...The 1.56 busa would be better, or whatever it was... to costly for me in trial and error situation....
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Offline fabr

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Re: CVT a bike engine
« Reply #83 on: January 03, 2009, 10:58:02 AM »
I don't think you're looking at this right.Step back for a bit and think about it.A 600 has what about a 14K redline and will cruise at what 11K? 5800 or so CS rpm at cruising speed.Problem?
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Offline fabr

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Re: CVT a bike engine
« Reply #84 on: January 03, 2009, 11:00:30 AM »
7734 at 14K engine.
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Re: CVT a bike engine
« Reply #85 on: January 03, 2009, 11:11:32 AM »
I understand that part....just as you say cruise at about 11k right were it makes its power, so thats were we need to figure all the clutching, after that there is no clutching, it will all be shifted out, let it go to redline to get max mph...See what i am saying?
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Re: CVT a bike engine
« Reply #86 on: January 03, 2009, 11:13:50 AM »
The more i think about it, I think 5500-6000 would be useable for the cvt.. but your only figuring it from the primary reduction, if it was to go countershaft, you have to reduce by that gear as well...Or is that in your math? 600 is 1.974 i think, and 6th gear is 1.18 i think have to look again...
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Re: CVT a bike engine
« Reply #87 on: January 03, 2009, 11:17:28 AM »
a gixxer 1000 is in the affordable range, with a primary reduction of 1.553 probbaly the best candidate for the deal if it was done, 80lbs torque at 10500 rpm... in 6th gear it should spin around 6100 rpm at 10500 engine speed...
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Re: CVT a bike engine
« Reply #88 on: January 03, 2009, 11:23:03 AM »
For a reasonable cost i believe you can swap 6th gear to a 1:1 ratio as well, that would be perfect then...
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Offline Nutz4sand

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Re: CVT a bike engine
« Reply #89 on: January 03, 2009, 11:50:41 AM »
They are running CVT's on Geo motors turning far less rpms. Its just a weaker spring or a heavier weight (or both).

The big issue here is getting it mounted solid. Tuning it will be easy compared to that.
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