Dennis - are you able to get to 50 mph in either 3rd and 4th gear without over-revving the motor? Is there any difference? If not, you can eliminate the motor/flywheel. Another option, which I think was mentioned, would be to produce the problem and then push in the clutch and let the motor spool down -- if the vibration persists, assuming you can keep the vehicle at speed, that eliminates the motor.
once the motor is eliminated, it's either something along the drive shaft or wheels/axle. they rotate at different speeds, so that's helpful. If the vibration is like an unbalanced tire (I think someone suggested to actually make a tire out-of-balanced to test this), then it's something along the axle or wheels. Otherwise, must be the driveshaft. Joe On Tue, Jun 10, 2014 at 5:07 AM, Pestka, Dennis J < dennis.pes...@mallinckrodt.com> wrote: > Joe; > > > > Vehicle is fairly simple. Had a 1200cc engine, 4 speed transmission, 4.88 > rear end. You can check it out on the EV Photo Album link below. > > I assume the only way to tell if it’s the axles is to pull them ? > > I know a little about working on cars, but haven’t really done much with > differentials. > > Can you give me any tips on tackling this. > > > > Thanks; > > Dennis > Elsberry, MO > http://www.evalbum.com/1366 > > > > > > > > > > *From:* Joe [mailto:jya...@gmail.com] > *Sent:* Monday, June 09, 2014 4:34 PM > > *To:* Pestka, Dennis J; Electric Vehicle Discussion List > *Subject:* Re: [EVDL] FW: Vibration > > > > Dennis, > > > > The vibration characteristic you describe is common with involute spline > connections (I've seen this here at work). When splines are loaded, the > male spline is centered in the female spline by the tooth loads. > > > > Run the same set unloaded and this natural centering ability goes away. > Now, one spline is offset relative to the other which creates a larger > mass unbalance and higher vibration. > > > > I'm unfamiliar with your vehicle so i have no idea if something like this > is applicable. Perhaps there is some type of joint that behaves similarly > and maybe has worn a bit to allow extra motion when unloaded. > > > > Joe > > > > On Mon, Jun 9, 2014 at 12:55 PM, Pestka, Dennis J via EV < > email@example.com> wrote: > > The shocks are new, but I'll take a look. > > I don't know if this means anything, but let me repeat one thing. > Under acceleration with torque on the motor and drivetrain the vibration > is not too bad. Starts showing up ~ 55 mph. > When you let off the accelerator at that speed, the vibration gets very > bad and gradually goes away as the vehicle slows down to ~ 40 mph. > > Thanks; > Dennis > > > > > -----Original Message----- > From: Jay Summet [mailto:j...@summet.com] > Sent: Monday, June 09, 2014 1:02 PM > To: Pestka, Dennis J; Electric Vehicle Discussion List > Subject: Re: [EVDL] Vibration > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > One thing to check is your non-drivetrain elements, although if you get > the vibration without moving in neutral it's probably in the drivetrain. > > The reason I mention it is that our car had developed a vibration at the > 58-60 MPH speed range, and it turned out to be rear shocks that needed > replacing. > > Jay > > > On 06/09/2014 07:49 AM, Pestka, Dennis J via EV wrote: > > Removed the drive shaft, had new u-joints installed, and had it > > balanced. No change. > > > > I’m guessing it’s either the angle on the motor/transmission in > > relation to the rear end, or I may have to pull the > > motor/flywheel/pressure plate/clutch assembly and have it balanced. > > When I sit in neutral and rev to ~ 3000rpm, I’m getting some > > vibration, although it doesn’t seem to be as bad as when I drive. Here > > again I feel it at ~ 50 mph and up, but it is really noticeable when I > > let off the accelerator at those speeds. > > > > Thanks; Dennis Elsberry, MO http://www.evalbum.com/1366 > > http://evalbum.com/3715 > > > > > > > > > > > > From: Daniel Busby [mailto:busby.dan...@gmail.com] Sent: Tuesday, May > > 27, 2014 1:52 PM To: Pestka, Dennis J; Electric Vehicle Discussion > > List Subject: Re: [EVDL] Vibration > > > > I'd try balancing your driveshaft. It's relatively inexpensive once > > you get it out. A local place in LA costs less than $70. > > > > My '64 Spitfire definitely has a wobbly shaft, but I haven't made the > > time to pull it out and get it balanced yet. I stick to surface > > streets in the meantime. > > > > On Tue, May 27, 2014 at 11:29 AM, Pestka, Dennis J via EV > > <firstname.lastname@example.org<mailto:email@example.com>> wrote: 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://evalbum.com/3715 > > > > > > _______________________________________________ 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... 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