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Old 07-03-2019, 06:00 PM   #1
sv650steve
 
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So I need flywheel options.

I was going to get the comp but they are low on stock. I want a lightweight one. How much can you shave the stock? Anyone got specs on that and what kinda weight I'd get?
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Old 07-18-2019, 08:39 PM   #2
SirDigby
 
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that is the one you want. the 8.8 one is great, but it's kinda a single use, as it is not recommended you service it as it's already shaved to maximum thinness. the street one is pretty good at 11 lbs, and it is serviceable. just make sure whatever brand you choose, that it has a steel starter ring. if it's all aluminum the starter will tear off the teeth and you will have starting issues.
9-11 lbs is good weight. if you are forced induction, you could go even lighter, but remember the more weight you shave off, the more torque you loose and it could cause issues wile decelerating....
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Old 07-19-2019, 09:31 AM   #3
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Quote:
Originally Posted by SirDigby View Post
that is the one you want. the 8.8 one is great, but it's kinda a single use, as it is not recommended you service it as it's already shaved to maximum thinness. the street one is pretty good at 11 lbs, and it is serviceable. just make sure whatever brand you choose, that it has a steel starter ring. if it's all aluminum the starter will tear off the teeth and you will have starting issues.
9-11 lbs is good weight. if you are forced induction, you could go even lighter, but remember the more weight you shave off, the more torque you loose and it could cause issues wile decelerating....
No torque is lost with a lightweight flywheel what you lose is inertia of the flywheel/engine so the rpm's drop faster between shift which typically translates into not as smooth driving. Torque is a result of the leverage a piston has on the crankshaft (bore and stroke) a different weight of flywheel should not effect that
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Old 07-20-2019, 01:06 AM   #4
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here is the math.
angler velocity is lost the more weight is removed from flywheel. the more pressure is needed to complete the rotation of the crankshaft. i'm not saying it's drastic, but it is present.

https://vlab.amrita.edu/?sub=1&brch=74&sim=1517&cnt=1
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Old 07-20-2019, 09:01 AM   #5
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The article you linked to shows the math as torque=force x perpendicular distance to the axis. In the case in an engine, more force is required to move a heavier flywheel which means more torque needed to be applied by the engine to accelerate the car the same rate as a car with a lightweight flywheel. This doesn't translate into the engine having more torque.

This is no different than more torque needs to move a car with heavier wheels, it doesn't mean that car has more torque, it is a negative thing because it requires more torque to move the car.
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