Denis, Thank you.
It's all in the placement of the jack. And the words chosen :-D I read it a few times and finally had to respond. Then with your clarification I read it again just to see if I missed the frame reference. But ya, jacking up the frame and letting the axle droop will work. Forklifts are great for this, and other fun things. Brett ;-) (has only done it a few times) On Tue, May 27, 2014 at 5:03 PM, Dennis Miles <dmiles33...@gmail.com> wrote: > Bret, I have followed the procedure that Roland related many times. When > you jack up the rear of the vehicle the object is to extend the suspension > therefore you do not jack from the axle you jack only the body and frame. > Perhaps this will clarify the subject. > > *Dennis Lee Miles * > > *Director **E.V.T.I. Inc.* > > *E-Mail:* *evprofes...@evprofessor.com* <evprofes...@evprofessor.com> > > *Phone #* *(863) 944-9913 <%28863%29%20944-9913>* > > Dade City, Florida 33523 > > USA > > > > > On Tue, May 27, 2014 at 6:30 PM, Brett Davis via EV <ev@lists.evdl.org>wrote: > >> Hi Roland, >> >> I suppose that the step involving jacking the rear wheels off grade is to >> compress the suspension in order to determine the amount of travel in the >> slip yoke. Unless the rear of the vehicle is restrained, it will raise >> with >> the axle (assuming a typical jack is used) and there will be negligible >> change in the position of the pinion yoke relative to the transmission >> yoke. >> >> Regarding the original question, likely a U-joint if the vibration just >> showed up. >> >> Brett >> On May 27, 2014 3:13 PM, "Roland via EV" <ev@lists.evdl.org> wrote: >> >> > The following info is per my master mechanic when assembling a different >> > engine or motor in a vehicle. >> > >> > Before removing the original engine, place the vehicle on a level grade >> at >> > full weight. >> > >> > Measure the distance from the transmission yoke to grade and the >> > differential yoke to grade. Calculated the angle of the drive shaft. >> You >> > could also use a angle level place on the drive line which will show you >> > the angle. This is the angle of the drive line you must retain when >> > changing to a new engine or motor. >> > >> > Also measure the transmission yoke slip or the amount of travel the yoke >> > slips out of the transmission while on grade. >> > >> > Now jack the rear wheels off grade and repeat the above measurements >> > again. The drive angle and yoke slip will change. Record this change >> too. >> > >> > The drive line angle and yoke slippage should be the same with a new >> > engine or electric motor installation. You will note in some vehicles, >> the >> > transmission cross member has a slut while the transmission yoke >> clearance >> > can be adjusted for maintaining the same amount of slip that is use in >> > different prime movers. >> > >> > Some of the guys had a problem with vibration and scrapping, because >> they >> > had there drive line in a straight line or at not at the original design >> > angle. >> > >> > The reason for the drive line angle, is so the needle bearings in the >> > U-joints will rotate. If the drive line is too inline, then the needle >> > bearings will wear a flat spot, causing the drive line to buckle or try >> to >> > misalign. >> > >> > In some transmission drive line assemblies, you will note there may be a >> > balance weight welded to the drive line near a yoke. Make sure if the >> > yokes were replace or had the drive line shorten, the balance weight is >> > place in the same position as before either at the transmission end or >> at >> > the differential end. >> > >> > Roland >> > ----- Original Message ----- >> > From: Pestka, Dennis J via EV<mailto:ev@lists.evdl.org> >> > To: Electric Vehicle Discussion List<mailto:ev@lists.evdl.org> >> > Sent: Tuesday, May 27, 2014 12:29 PM >> > Subject: [EVDL] Vibration >> > >> > >> > Didn't know if anyone had any clues to a problem I'm having. >> > >> > Since I have my new Lithium pack, I've getting my 65 Datsun out on the >> > highway and up to ~ 60 mph. Never did much of that before. >> > When accelerating, I don't experience it, but when I let off the >> > accelerator, I'm getting a pretty good vibration. >> > Step back on the accelerator, and it goes away. >> > Don't seem to notice it at 45mph and lower, but when going 55 - 60 >> mph. >> > I just put new tires on it, and have had the front end aligned. >> > >> > Any suggestions ? >> > >> > >> > Thanks; >> > Dennis >> > Elsberry, MO >> > http://www.evalbum.com/1366<http://www.evalbum.com/1366> >> > http://evalbum.com/3715<http://evalbum.com/3715> >> > >> > >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub< >> > http://www.evdl.org/help/index.html#usub> >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org< >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org> >> > For EV drag racing discussion, please use NEDRA ( >> > http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA >> >) >> > >> > -------------- next part -------------- >> > An HTML attachment was scrubbed... >> > URL: < >> > >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140527/dc7e2bd4/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) >> > >> > >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140527/ef9a735c/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) >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140527/005f65c2/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)
