Here are some points I considered:
Clutched system for Civic:
- feels more like the original manual transmission, allows people unfamiliar with EVs to drive it more easily; downshifting much easier
- Allows troubleshooting of the drivetrain by allowing an intermediate disconnect point during operation
- Adds a safety feature if the controller shorts and over-revs the motor
- inertia from heavy flywheel slows acceleration
- clutch slave cylinder interferes with placement of front golf cart batteries but not Deka 9A31s
Clutch-less system for Civic:
- much less mass to spin up during acceleration
- shifting is a bit slower as the driver uses the synchromesh to spin the motor down and up
- shifting can only happen while the accelerator is not pressed
- clutch slave cylinder doesn't interfere with 8V golf-cart batteries
- this system still uses the springed center of the clutch disk to remove stresses on the drivetrain from bumps
For those of you wishing to make your own Civic-EV, Electro Automotive will ask you for the bolt pattern on your flywheel since they've had problems with Civic adapters in the past. Here's a picture of the bolt pattern I scratched from a purchased Civic flywheel. The resolution is 300x300 dots-per-inch. If you print this out using MS-Paint with the proper 300x300 scaling, make sure it exactly matches the bolt pattern on your flywheel before ordering the adapter from ElectroAutomotive.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYjrTy_Dd5x65euQIvDntS2YmLlDLO9g66mhPCAXlrsXvBJHU-oRVpTiCdkJodtZOua366NuIvWG0xF9hkOtaC8uqH2qBcXgpb14zTXO3qtyMR07NAiq1EQnWMFH6X0yOGAzJMOnTuoLOs/s320/Civic_flywheel_holes.jpg)
Remember the transmission I pulled out of the Civic at the wrecking yard? I cleaned it up so I could get some measurements on it for the clutch-less system. I can verify the ElectroAuto adapter on this, but I won't need to measure it anymore since I'm not considering the EV-America clutch-less system for now.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeyFj-F9krckwgPf-pagZD3EdcugWve24DBPH-_nP97ReekBTDyII02cMEOR7bcvmqnj10B9S8TZEqs8sMr7jlPunDSaxjPeXGvyiTbQ78D0s32zgtJzHM5syJ02qhA1REQn2uCTW0ey3U/s320/s20_clean_tranny.jpg)
Also make sure your transmission is the S20 transmission for the proper adapter plate. Here is a picture of my transmission label:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVl5dXmxT5Sv3HE_BtWexW5raxDs9BAol8FtTNHA_5AiiAqRTVLlGtEBG7qvQOONZPbanqUWju1T0sZdNnfFvojBRUPe5gjxzOjz_BtDxZ5znt-KKfMT1CKBbSo2oXzLoyG3ji0-W-2n6X/s320/s20_tranny_label.jpg)
Next up: thinking about batteries and the controller system...
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