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balancer shaft on cagiva mito

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steven_191
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Joined: 31 May 2009
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PostPosted: 10:38 - 20 Sep 2009    Post subject: balancer shaft on cagiva mito Reply with quote

i know its there to balance the weight of the crank and piston and rod but is there any reason it cant be balance like on a 4stroke engine.

instead of the crank being round like in the mito engine they are more like a cheese wedge. the weight is removed from the side of the connecting rod therefore no need for a balancer, which sucks out some power.


anyone done it before?
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hmmmnz
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Joined: 22 Aug 2006
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PostPosted: 01:03 - 21 Sep 2009    Post subject: Re: balancer shaft on cagiva mito Reply with quote

steven_191 wrote:
i know its there to balance the weight of the crank, piston and rod. but is there any reason it cant be balanced, like on a 4stroke engine?

instead of the crank being round like in the mito engine they are more like a cheese wedge. the weight is removed from the side of the connecting rod therefore no need for a balancer, which sucks out some power.


anyone done it before?


it needs to be circular because of the diplacement in the bottm end,
eg if there is too much volume then it becomes harder to get all the fuel/air to the top end for combustion,

on some 2 strokes the bottom end of the crank (oppisite end to where the crank pin is attached) is thicker and acts as balancer,
i assume this is the case with the mito as well,
but it also requires additional balancing by way of an extra shaft because of the revs,
you can remove them, as some people do on moto-x bikes but you can't rev it as high with out it shaking it self to peices,

the balancer doesn't steal power, like a heavier flywheel it also smoothes out the revs and makes the power more managable,

if you want it to rev more freely, lighten your fly wheel,
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 08:52 - 21 Sep 2009    Post subject: Reply with quote

Hi

Not sure on reducing crankcase volume. It could be done easily with light plastic stuffers if required, and reducing the crankcase volume to increase the crankcase compression is meant to give a peaky power delivery with plenty of the mixture going straight out of the exhaust.

Balance shaft does absorb a tiny bit of power, but you make that up in lack of vibration which enables you to make everything else lighter. Race use they might take out the balance shaft, but then the bike is less likely to do enough miles for the vibration to be that much of a major problem.

Plenty of 4 strokes use balance shafts.

All the best

Keith
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steven_191
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Joined: 31 May 2009
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PostPosted: 20:23 - 22 Sep 2009    Post subject: Reply with quote

good point about the crankcase volume, but that can be countered by filling the casing the right amount with weld or something to get back to the required volume.

i know alot of 4 strokes have the balancer but they can easily be removed and then have the crank balanced to suit.

as for lightening the flywheel. it hardly weighs anything now. maybe get an ally one. although the teeth might get churned up by the starter.
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