Chains are very efficient. If you enclose them and they have lubrication, they last a very long time. They are also relatively inexpensive, and lend themselves easily to changing ratios. I suppose their main bad point is noise, and the need for an adjusting idler to keep noise low. But adjusting idlers are also not terribly expensive and quite reliable.
I was very happy when Camry's changed from toothed timing belts to chains. I loved the little mid-'80s Camry's, but they had to have a new belt every 30K miles like clockwork. Good thing they did not crash their valves into pistons, because they would have had much trouble had they been interference engines, On Wed, Aug 6, 2014 at 6:23 PM, Ben Goren via EV <[email protected]> wrote: > On Aug 6, 2014, at 1:25 PM, Roger Stockton via EV <[email protected]> > wrote: > > > I believe you are mistaken. I think what you need to consider is termed > "overhung load"; this Gates document gives a good overview: > > Roger, thanks for that excellent resource. Obviously, I'm not an ME...but > I'm sure getting a crash course in a tiny subset of the field. > > The document suggests that reducing belt width, increasing pulley diameter > (even while keeping gear ratios constant between the two pulleys), and > moving the belt closer to the bearing all reduce overhung load. Since I'm > starting from scratch with this, I should have no trouble optimizing all > three if need be. In particular, it looks like it shouldn't be any trouble > getting the pulleys practically right on top of the bearing. The document > also ends with a sidebar saying they've got belts with the same geometries > as chains that also have the same load ratings with better life and > maintenance. > > I'm thinking it'd be a good idea to see if I can't find somebody at Gates > to help me run some numbers and suggest part specifications. I'd almost > undoubtedly use their belts (I just replaced the disintegrating fan belt on > the Mustang with a Gates belt). I'm not sure that they also make > pulleys...but, if they do, that'd be the obvious choice rather than some > other manufacturer or a machine shop. > > b& > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: signature.asc > Type: application/pgp-signature > Size: 801 bytes > Desc: Message signed with OpenPGP using GPGMail > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140806/6bea57e6/attachment.pgp > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140806/dfa284a6/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
