I took the adapter plate into a precision measurement shop to get all the hole locations for the Civic transmission bell housing. Here is the picture on the measurement table at the shop.
The spacer ring behind the adapter plate is much simpler. I simply took measurements with a caliper and a steel ruler to generate the above.
- Overall spacer diameter: 9.25" (not critical)
- Internal hole diameter: 4" (not critical)
- Total thickness: 2 3/8"
- Outer diameter of raised ring: 8.5"
- Inner diameter of raised ring: 6" (not critical)
- Thickness of raised ring: 3/16" (not critical if over 3/16")
- The recessed holes are 3/8" holes that hold bolts for the Warp9/ADC9" motor face
- The sinks for the recessed holes are 19/32" diameter and .7" deep (approximate)
- The threaded holes have 1/2"-13 threads and are 1.4" deep
- The threaded holes have centers on a 7.25" diameter circle
- The depression inside the raised ring is 5/16" deep
Here is a partial drawing of the adapter hub for the motor shaft into the rear of the flywheel. I didn't draw the taper-lock on the bottom end due to its complexity. There's actually a depression in the center of the hub above but, due to limitations in Sketchup, I wasn't able to delete all the facets correctly, so it looks like a circle drawn on the top.
- The six outer holes have 12mm threads and are 25mm deep
- The outer holes are evenly spaced at 60 degrees and have centers on a 63mm diameter circle
- The outer diameter of the hub is 80mm
- The top part of the hub is 33.5mm thick
- The overall height of the hub is 59mm thick
- The bottom end of the hub is 2.25" in diameter
- The depression in the top for the pilot bearing is 33mm in diameter and 2.5mm deep
- The holes for the bolts to pull in the taper lock are evenly spaced with centers on a 33mm circle.
- The central hole through the hub is 19mm in diameter
Here is a hacked drawing of the adapter plate. All the hole locations are correct because I typed them in from the precision measurement shop. The outline is just a quick hand drawing. Note that it doesn't have the cutout in the lower left corner for the CV joint shaft.
Here are the numbers for the hole locations I got from the CMM shop. I had a royal pain of a time getting a table into this blog, so you'll just have to click on this photo instead.
DISCLAIMER: With the exception of the precision hole measurements, all numbers are subject to my human error with a steel ruler and digital calipers. I do NOT recommend using these numbers to fabricate your own hub or adapter plate since there are probably slight errors in the numbers.
LICENSE RELEASE: This adapter plate and hub are proprietary designs from Electro Automotive and are not licensed under the TAPR Open Hardware License for this project. I'm including dimensions here as an academic exercise.