Curvy lightened Flywheel assembly

[SheepShagger]

FFS, i missed this, typical.

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[millemille]

Originally Posted by SheepShagger

FFS, i missed this, typical.

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I did PM you before xmas about the batch I was doing and whether you wanted in....

Anything more than a batch of 5 is worth my while doing, so if you want yours doing you can either wait until 4 more need doing or you can see if you can round any more up yourself.

[DomP]

On a pointy what extra bhp can be expected and how much does it alter the characteristics of the engine?

[millemille]

Originally Posted by DomP

On a pointy what extra bhp can be expected and how much does it alter the characteristics of the engine?

Ok, a lightened flywheel doesn't - despite what some may tell you - result in any increase in power from the engine.You aren't improving gas flow through the engine or increasing the engine's capacity or reducing the drag of a part that runs in oil.

What the lightened flywheel does is reduce the rotational inertia - the engine's resistance to change in rpm - and gyroscopic inertia - the resistance of the flywheel to changes in angle of lean when spinning.

So the engine revs up and down more quickly - improving the throttle response and making engine braking/downshifting smoother and less likely to upset the back end/lock the back wheel.

The bike is quicker/easier to steer and lean. Imagine you're holding a spinning bicycle wheel by each end of the axle between your hands. Now imagine trying to twist the wheel, the gyroscopic inertia of the spinning wheel resists you trying to twist the wheel. Well the flywheel spins at engine rpm and we take between 300 and 800g from a flywheel (depending on model, number of magnets, steel or ti bolts etc) - so imagine how much easier it would be twist a bike wheel spinning at 10,000rpm if it were that much lighter...

It also gives the crank a much easier time; the inertia of the flywheel fights the crank trying to accelerate every time each cylinder fires. Now Suzuki very cleverly put an oilway (a hole) in the end of the crank shaft close to the keyway (slot) also in the end of the crankshaft and the SV crank has a reputation if fitted to a bike that is ridden hard for cracking between the oilway and keyway and failing catastrophically.....

[DomP]

Thanks for the detailed reply, now I feel like I need it doing having seen that crank.

[millemille]

Originally Posted by DomP

Thanks for the detailed reply, now I feel like I need it doing having seen that crank.

I'll do another batch if there's enough interest. If Sheepshagger wants his and you want yours then there's 3 more, minimum, needed which shouldn't be too much bother to get together...

[DomP]

Was it £125 all in using my flywheel?

[millemille]

Originally Posted by DomP

Was it £125 all in using my flywheel?

£145 now, sorry should have updated the original post.

[SheepShagger]

Count me in if more people want it done.

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[Nicky S]

I'm in

Is the naked and s fly wheel the same ??


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