The brake pressure sent to the rear is adjustable, will just have to see if it can be turned down enough to compensate. But note the car will be 30% lighter than original, thus it needs 30% less braking power.
This is an MG Midget, see the pictures showing the engine and transmission, if the driver was an amputee it might work to put a motor behind the engine.
If it was on the driveshaft, it couldn't start the engine which is a key part of the design.
I agree the direct crankshaft connection might need a soft coupler of some type, will make it more complex if needed.
I still haven't figured what to do about the water pump. I want to make it electric, I could just add a motor to the existing pump, but been thinking to remove it completely and use an external pump. The plumbing can then exit forward instead of u-turn to the rear through the water pump and another u-turn back to the front. There does not seem to be a lot of good choices for an external pump that can handle the hot water and the pressure.
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Originally Posted by dwtaylorpdx
You might consider a locking differential/torque sensing differential to help balance the braking force.
The reason most cars did not use this type of brake is that the drive line turns 3x(Depending on the differential ratio) the speed of the wheel so stopping from 30 is the equivalent of stopping from 90. Generates significant heat. Use a Carbotec or similar pad from a race car and you should do better, also a duct to provide air to the rear brake is likely a must have. You'll also be getting major heat pumped into the pinion bearing from the rotor. A finned rear diff cover, with the duct blowing air across it will help. There is paint you can buy that changes color at certain temperatures, Might be a good tool for checking the function of the brake and caliper in use without a lot of high tech instrumentation.
I'd put the electric motor between the trans and drive line, Replace the tail shaft housing with the motor.. Only because its way too easy to get harmonics on the crank when you hang stuff off it. It also lowers the effective rotational leverage of the unit on the engine under acceleration, race shop I work at we put alternators on the drive line on some cars for that reason. Raises straight line speed significantly ,, more speed less load... 
Dave |