On 26 May 2016 at 21:11, Alan Brinkman via EV wrote: > Some of the > older Datsun mini-trucks had a rear axle ratio that would have the drive shaft > spinning faster and some conversions did without the transmission. The few I > looked at on the EV Album had a 4.88 rear end.
I don't know if this will help, but most of the Comuta-Cars used a 5.17 rear axle (Dana model 12). Some shipped to hilly regions had a 6.83 axle (Dana model 18). I had a 5.17 in mine and it was really too high a gear for the GE motor they used, IMO. The 6.83 was probably better for almost anybody, but it knocked a couple mph off the car's already unimpressive top speed. You calculate what ratio you need from motor red-line, point where the motor / controller pair's torque curve flattens, tire circumference, your desired top speed, and probably other things I've forgotten (since I'm not an ME). Typically AC induction motors used for conversions can stand, and like, higher RPM (~8-10k). They'll appreciate lower gearing (numerically high ratio). DC motors run slower, and in general, the bigger they are, the slower, so they'll usually be more suited for situations where you can't get very low gearing. Smaller diameter wheels/tires, if they can be fitted to your vehicle, can help you attain lower gearing if you need it. Again using the C-cars as an example, they came with 4.80-12 (or was that 4.20-12?) tires and, later, 135- 80r13 radials. An interesting option might be to try space-saver spare tires. They'll look like an awkward, gangling adolescent kid and may not handle too well. However, they're usually cheap at the boneyard, so may be worth a try. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
