Since the Rotor has this three nice pockets, would it be possible to use
hard solder as a filler?
One would find the volume 'decrease' required to raise the compression
ratio. Cut up the cold solder rods, use a torch and just melt it all to
a nice puddle.
When cooled the three pockets should have the same volume reduction.
A level positioning of the three rotor sides is however necessary for
the hard solder to be concentric for good balancing

Alternatively one could add more hard solder than needed and machine the
pockets after.
Just my 2 cents.

Rolf Pfeiffer

Risky with 3,000 F combustion temps.

Paul Lamar

Perhaps. However the Al pistons in the Reicps have a lower melting point
than the hard solder bracing material.

For those who are still interested in this nevertheless,
to calculate the volume to be filled in is as follows:

We know the displacement per chamber is 654 cc.
The volume at TDC is calculated by dividing the displacement by the (CR -1).

Assume we want to raise the CR from 8.5 to 9.5.
Volume at TDC at 8.5 CR is 654 / (8.5-1) = 87.2 cc
Volume at TDC at 9.5 CR is 654 / (9.5-1) = 76.94 cc

The difference is 10.26 cc

Using 4 mm diameter bracing rods, we need a length of 32.1 inches
You may cut 8 pieces 4 inch long or 5 pieces 6 inch long plus a 2.1 inch
piece.
Using 1/8" diameter rods, the total lengths is 51 inches, cut up anyway
you like.

I don't have the dimensions of the pocket, however assuming some 55 mm
wide and about 150 mm long would be an area of 8,250 mm^2.
10,260 mm^3 / 8,250 mm^2 =  1.25 mm thickness of the layer.

The addition of 'volume' should be very accurate between all the pockets.
As I said before, a level or horizontal position of the rotor is however
essential.

Rolf Pfeiffer


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