Runner
Scoot Member
Posts: 23 
Location: Greece
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Post by Runner on Apr 23, 2015 12:23:49 GMT -5
Hey people,
I was thinking of trying out a different variator that is smaller in diameter and takes different size rollers but fits on the same shaft.
It's because its from a Piaggio NRG which is pretty much the same bike, parts wise, as my Gilera Runner.
So my question is this; what impact will it have on performance, if we take the the rollers' specs out of the equation???
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Post by niz76 on Apr 23, 2015 12:43:10 GMT -5
The smaller variator would probably make top speed less and you may need to change the size of the belt to compensate also...
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Post by 90GTVert on Apr 24, 2015 11:35:25 GMT -5
As Niz said, you'll prob see less speed or perhaps the same speed but higher revs. That is if you were using the full face of the old variator. If you weren't using all of the old variator the diameter change may not be noticed. You can mark the current variator with a marker and go run it to top speed. You'll be able to see how much you have left. Figure out what diameter you're using, I'll call it the effective diameter, by the leftover mark.
effective diameter = variator diameter - ( length of mark x 2 )
Then compare that to the diameter of the alternate variator to get an idea.
So let's say you have a 100mm diameter variator now and the new one is a 96mm variator. You mark the radius of the current variator and make a top speed run. You measure 2mm of leftover mark.
effective diameter = 100mm - ( 2mm x 2)
effective diameter = 100mm - 4mm
effective diameter = 96mm
In that case the effective diameter and alternate variator's diameter are the same, so perhaps there wouldn't be a large change in speed. It's not an exact science so it's hard to know without testing, but maybe that will give you an idea of what to expect.
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