thunderace
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| posted on 7/1/09 at 10:09 PM |
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how do you diy balance your flywheel?
i can do motorbike wheels with a bar in my vice and it works fine.but i would like to balance my flywheel as i got it from ebay and its been skimed
down to 6 kg.and i dont know it its been balanced or not.
or can i do it on a car wheel balicing machine at kwik-fit as i have a mate who works there.i was just going to drill it a bit and not add weights.
??????
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locoboy
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| posted on 7/1/09 at 10:13 PM |
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YOU DONT.
Unless you have already lost your legs and it does not matter if it parts company at 6K revs and comes crashing through the bellhousing and tunnel
panneling
ATB
Locoboy
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Thinking about it
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| posted on 7/1/09 at 10:14 PM |
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I would pay and have the thing done right.
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DarrenW
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| posted on 7/1/09 at 10:21 PM |
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Its worth researching how toolrooms balance grinding wheels. basically a shaft through the disc, then have the shaft on 2 level blades so you can find
the heavy spots. After balancing you should be able to rotate it to any position and it wont move.
Method you use to balance could have effect on durability. Metal removal or add weights.
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wicket
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| posted on 7/1/09 at 10:53 PM |
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Is it cast iron, if so I would be very wary about using it, see comments & pictures in this previous posting
http://www.locostbuilders.co.uk/viewthread.php?tid=79595
[Edited on 8/1/09 by wicket]
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JoelP
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| posted on 7/1/09 at 11:08 PM |
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your link has an extra v at the beginning wicket 
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v8kid
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| posted on 7/1/09 at 11:10 PM |
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Static ballance is very different from dynamic ballance.
I'm a locost champion but not in this instance.
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C10CoryM
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| posted on 8/1/09 at 03:27 AM |
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Best to have this done professionally for safety reasons. Also it may not have a neutral balance and require a specific weight somewhere.
For example my engine only came in automatic cars and I have a manual behind it. The A/T flexplate has a heavy weight on it to offset the extra
weight of the supercharged bottom end. I need to have the M/T flywheel balanced so that it is in the same spot, and same weight (no M/T cars came
with a supercharger so no balance weight)
Cheers.
Cory
"Our watchword evermore shall be: The Maple Leaf Forever!"
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procomp
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| posted on 8/1/09 at 07:52 AM |
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Hi
It is not just a case of balancing the flywheel on it's own. You should be balancing the crank flywheel and clutch cover as a complete unit to
do the job properly.
It is money well spent though if the flywheel has been lightened significantly.
Cheers Matt
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flak monkey
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| posted on 8/1/09 at 07:53 AM |
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I am running a cast lightened flywheel on my pinto which has basically had both of the large rings of casting removed which takes is down to about
6kg. This was then carefully balanced on a grinding wheel balancer which has worked very well. Its regularly revved to 7500-8000rpm and has been
fine.
Due to the positioning of these rings (i.e at the circumference of the flywheel where the weight makes the most difference) removing them is going to
make little difference to the strength of the flywheel in my opinion - it's not like you are removing strengthening ribs. (There is less weight
at the periphery of the flywheel therefore less force on the central sections holding it together). Where the problems come is the increased inertial
forces as the engine is now able to rev faster with no load.
This is, of course, only my opinion and experience. You take your own risks using a lighted/cast flywheel!
Sera
http://www.motosera.com
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Richard Quinn
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| posted on 8/1/09 at 09:23 AM |
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If the flywheel has been lightened but not balanced are you 100% sure that it has been done professionally? If not, personally I wouldn't use it
no matter how much of a bargain or how expensive it was.
Transverse engined Autograss cars have to have a flywheel guard (steel plate) fitted and I've seen the mess a flywheel can make of even a
substantial steel guard never mind 1mm ally covering a tunnel!
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