12a Race Engine Balancing
#11
Originally Posted by Lynn E. Hanover' post='761608' date='Sep 23 2005, 11:55 AM
The ideal is always the objective.
Hi Lynn,
another excellent post, thanks.
Thinking further on it the small imbalance forces in the rotor
would be overcome by the pressures on the rotor faces during
compression and combustion pushing the rotor evenly against
the excentric shaft tending to equalise things out.
I decided to remove the excess weight evenly from both sides of the
heavy rotor using a drill press and conventional drill bits,
milling cutters would be even better as you can remove more material
without cutting through into the inside of the rotor.
See the attached pics the modified rotor is on the left the factory new
rotor on the right.
Comments welcome <g>
Extra tips:
When removing a large amount of weight a set of reasonable
accurate scales helps speed things up.
Be very carefull regarding the depth as it looks like 7mm around is the
maximum depth you can safely cut too: Check carefully.
If you don't have access to scales able to deal with the 4 to 5 kg weight range
of the rotors, another smaller accurate scale could be used to measure a removable weight
to add to one side of the balance beam to indicate show the amount of weight that is still
to be removed, eg a small plasic bag of nuts or sand.
A small builders level about 6 or 8 inches in length can be positioned on the center of
the balance beam, this speeds up the process as you just level the guage and then
release the beam watching which way it tilts. this can also be moved slightly to correct
the actual beam balance if needed.
Footnote: the engine balancing company has now rebalanced the excentric shaft
and counterweights at no further cost :-)
Regards
Michael
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