Where is it from? 

First consider the speed of the vibration. If it is wheel or axle related it 
will be a slow vibration. If it is driveline it will be three to four times 
faster. In the realm of "scary". To understand what "slow" is take the wheel 
weights off of one of your four wheels and go for a ride. You will experience 
what a wheel or axle vibration is like. Put the wheel weights back on where you 
found them, it will be fine, tire balancing isn't rocket science.

The fact that the amplitude of vibration changes from load to no load says 
something is loose. I would look at how the yoke is anchored to the motor 
shaft. This needs to be a snug or even press fit. If you can giggle the yoke on 
the shaft or if you can giggle any other part of the drive train this is a 
problem to look at. Everything in the drive line needs to be snug and have no 
movement about it in relationship the next part it is connected to.

Mark Grasser






-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Terry Forfa via EV
Sent: Monday, June 09, 2014 5:44 PM
To: Pestka, Dennis J; Electric Vehicle Discussion List
Subject: Re: [EVDL] FW: Vibration

Dennis,

Maybe loose wheel bearings? Check the Chilton Vibration Checklist link
below:

http://www.procarcare.com/includes/content/resourcecenter/encyclopedia/ch04/4fig15.html

Terry


--------------------------------------------------
From: "Pestka, Dennis J via EV" <ev@lists.evdl.org>
Sent: Monday, June 09, 2014 2:55 PM
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Subject: [EVDL] FW:  Vibration

> 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 
>> <ev@lists.evdl.org<mailto:ev@lists.evdl.org>> 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
>>
>>
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