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MiniBob
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PostPosted: Tue Aug 30, 2011 3:12 pm 
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drmini in aust wrote:
You normally balance the flywheel when you do the crank (during a rebuild)- however most balancing shops have a balanced crank sitting there, just for doing random people's flywheels.


Thanks Doc. I suppose the supplier would do it for an extra cost.
Would a local shop be able to do it in situ (with pistons in place) if I take the block to them ? Is there much advantage gained ?

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drmini in aust
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PostPosted: Tue Aug 30, 2011 3:26 pm 
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If you want the crank done, it has to be out of the motor- they spin it at 3000rpm or so and it reads out the balance error. Similar to doing a wheel& tyre. A bit is ground off a crankweb to balance it, then checked again.

Then the flywheel is bolted on the end and spun, drilled to balance, same method.

Then, the backplate is added, and same story again.

Finally the diaphragm is bolted on too, check all 3 possible positions and pick the best one for balance. Drill it if needed (usually not).

Unless you have lightened a flywheel or fitted an aftermarket one, BMC's original balance is pretty good. Usually...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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MiniBob
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PostPosted: Tue Aug 30, 2011 3:32 pm 
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OKay thanks for that. In your opinion is it worth having an aftermarket steel flywheel balanced if I'm not bothering with the crank ?

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drmini in aust
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PostPosted: Tue Aug 30, 2011 3:36 pm 
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Definitely.
I'm sure Lindsay Seibler whould be able to point you to a place that does it separate, if all else fails post it to GR in Sydney.
You will need to balance the backplate and diaphragm with it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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MiniBob
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PostPosted: Tue Aug 30, 2011 3:47 pm 
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Great, thanks Doc I'll get all three balanced together.

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carter
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PostPosted: Tue Aug 30, 2011 8:33 pm 
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hey just wandering how the lightened flywheels go when you hit a hill?

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Morris 1100
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PostPosted: Tue Aug 30, 2011 8:47 pm 
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Once you are moving you don't need a flywheel.
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carter
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PostPosted: Tue Aug 30, 2011 8:52 pm 
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so hills make no difference

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drmini in aust
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If the engine has balls it will accelerate up the hill faster than with a stock flywheel. 8)

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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carter
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PostPosted: Tue Aug 30, 2011 9:37 pm 
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ok thanks doc

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jester99
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PostPosted: Wed Aug 31, 2011 6:57 pm 
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Here is one of Matt Reads (Minimans) flywheels, i bought last year from him.

http://www.ausmini.com/forums/viewtopic ... c&start=75

I have to say the difference is quite noticeable, and i have nothing bad to say about lightening the flywheel. Matt does a great job on these.

8)

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