goldedge

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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