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Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 11:53 am
by Woo
I've heard people putting 1.6 flywheels onto 1.8's and vice versa for different reasons.
However, I was wondering what is the difference (if any) between the NA8 and the NB8A (B or C) flywheel?
Any insight would be great.
Bazz
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 11:59 am
by Boags
Each one got lighter.
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 12:24 pm
by Woo
Thanks Boags
Does that mean that a clutch kit for a NB will be suitable for an NA, just more inertia?
I'm hopeful that the NB kit I'm having built will go onto FFGs NA8 flywheel. Increased rotational mass, in this application, is a good thing as it may stop the snail going to sleep on gear changes.
Bazz
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 1:42 pm
by bigdog
Aren't you fitting a Lenco Woo???
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 2:46 pm
by Woo
Why would I ?
There is only one way that would fit and that would be to re-tunnel the car.
The Mx5 box behind a MX5 motor has always been the plan, the clutch is where the planned weak point is. Just minimising the weakness.
Still asking the question " Will an NB clutch direct fit an NA8 flywheel"
Bazz
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 3:19 pm
by Boags
Yes.
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 3:38 pm
by Woo
Thanks Mr Boags
Flywheel compatability NA-NB
Posted: Wed Jan 21, 2009 3:42 pm
by Boags
Kein Problem.
Flywheel compatability NA-NB
Posted: Fri Jan 23, 2009 12:26 am
by wun911
Dr Physics...
If the weight is not evenly distributed across the flywheel.
Eg I go ahead and shave off 5 kg from the peripheral edge (diameter remains the same).
How do I go about calculating moment of inertia (MOI)?
Flywheel compatability NA-NB
Posted: Fri Jan 23, 2009 12:41 am
by Woo
Hey Dr MicroBio,
Hows your integration?
I=int(r^2 dm where r is radius and m is mass. Of course I is the MOI.
for a uniform thickness and density you can always substitute dm=pt dA where p = density, t= thickness and A is area
If you weigh it and measure the diameter I'll calc it for you Wun
Bazz
Edit: Nah, it's actually more complicated as it's a non-uniform volume. So it would be at least a double integral, possible a triple. I'll think on it and get back to you.
EDIT EDIT: It's a triple integration and I would need the crosssectional dimensions as each "thickness" would be integrated separately and then summed together (integrated again)
Flywheel compatability NA-NB
Posted: Fri Jan 23, 2009 12:57 am
by Woo
It wouldn't be a good idea to remove 5 kg from a stock cast flywheel. It would be to thin and would most likely shatter at revs. Get a chromoly disc and fit a ring gear and cast friction surfaces. That way you get light weight and a good clutch action.
Probably work out cheaper than a Toda or Fiddy
