Paul
There is some parts I did put on the scale , bellhousing is 10 lbs any idea how I can reduce the weight on it



JEAN PRUDHOMME


I assume your motor mounts are going on that adapter plate between
the minisprint car bell and the Mazda bell housing. That means the bell housing
it does not have to transmit the 600 foot pounds of prop torque. If that is the
case than use a hole saw and saw a bunch of large holes between
the ribs. Each cubic inch of aluminium removed is .1 pound.

A 3 inch diameter aluminium disk .19 thick is .134 pound.
Ten 3 inch dia holes will reduce the weight about 1.3 pounds.

Looks like the total weight is 54 pounds not counting the planet
set. Of course that includes a small outboard type permanent magnet
 alternator.

The Ford planet set is another 7 pounds.

Tracy's box was about 45 pounds and the Ross 35 pounds.

A 1.5 ID bore ball bearing like Tracy used is about 1.3 pounds.
A 2 ID inch bore version would weigh 2.66 pounds.
A 2 ID inch bore needle bearing like Ross used  weighs less than 0.2 pounds.

Ball bearings require a larger and heavier housing.

It takes careful engineering on all parts to get the weight down.
Eye balling it always results in most parts being too strong
with one or two not strong enough. That is why one needs dwgs on
everything. Use the dwgs to calculate the stress on the parts.


Paul Lamar


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