Honda B-Series Adapter Plate for Electric Motor

thingiverse

This is an adapter plate to connect an electric motor (specifically an Advanced DC FB1-4001 9.1" Series wound motor, though many traction motors share the same bolt pattern http://www.evparts.com/products/street-vehicle/motors--dot/96-to-192-volt-street-vehicle-motors/mt2119.htm) to a Honda B-Series transmission. This would allow you to install an electric motor in a Acura Integra or a older Honda Civic SI and certain Civic Del Sols. I'm installing it in a Honda CRX using some motor mount adapters and custom axles. I have not yet bolted the whole thing together. I bolted the plate on the motor the other day and found that the spacer (that goes between the motor and the adapter plate) was a couple of mm to short, causing the ring gear on the flywheel to interfere with the bell housing. Hopefully, next week I'll be able to machine a new spacer and bolt the whole thing together with the clutch installed. The bolt pattern appears to be spot-on though I may have to ream the clearance holes out a bit as the Honda bolts seem to have a larger shoulder than normal. One of the threaded holes is the wrong size which I will fix when I get a chance. It didn't end up mattering since the hole was oversize but the same pitch and I can just heli-coil it down to the right size. So far, the centering of the input shaft on the motor shaft seems to be good. Instructions The original design files are Alibre Design 12 files. The final thickness of the plate is about 1.25". This is a bit of overkill but my application is somewhat high powered. You could probably easily get away with a thinner plate and a thicker spacer if you wanted to save on weight and aluminum.