Space-saver "donut" spare tires often come with the minimum legal thread depth, that is why it is recommended to never drive more than about 100 miles on them - less is better. Not a good choice for a service tire. Anything you buy at a boneyard may already be too old to give you good service life, definitely check the manufacturing date and take your chance with dry rot. You may be fine (if the tire was kept out of sunshine and heat) but it may also be an accident waiting to happen. YMMV. Since an EV tends to be heavy in weight, I prefer to get real tires, although I have run older tires on many of my EVs, but at least those were LT (Light Truck) service tires, rated for heavy duty. Not spare tires.
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of EVDL Administrator via EV Sent: Thursday, May 26, 2016 10:05 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Conversion planning 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) _______________________________________________ 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)
