Wanted to give everyone an update on the vibration problem.
Took it to a local mechanic and put it on a lift.
He raised the rear end and had me rev the motor while he was underneath. I
tried 3rd and 4th gears and both were the same.
Vibration became very noticeable at ~ 1500 rpm. When I drive it
EVmailto:ev@lists.evdl.org
To: Electric Vehicle Discussion Listmailto:ev@lists.evdl.org
Sent: Monday, July 07, 2014 5:07 AM
Subject: Re: [EVDL] Vibration
Wanted to give everyone an update on the vibration problem.
Took it to a local mechanic and put it on a lift.
He raised the rear end
Howdy!
Pestka, Dennis J via EV wrote:
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
In reference to your P.S., good idea.
I'll give that a try and report back on the results.
Thanks;
Dennis
-Original Message-
From: KevinF [mailto:katoom_...@yahoo.com]
Sent: Wednesday, June 11, 2014 2:18 PM
To: Pestka, Dennis J
Subject: Re: [EVDL] Vibration
Howdy Dennis!
On 06/11
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
To: Daniel Busbymailto:busby.dan...@gmail.com ; Electric Vehicle Discussion
Listmailto:ev@lists.evdl.org
Sent: Monday, June 09, 2014 5:49 AM
Subject: Re: [EVDL] Vibration
Removed the drive shaft, had new u-joints installed, and had it balanced.
No change.
I’m guessing it’s either
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
To: ev@lists.evdl.org
Subject: Re: [EVDL] Vibration
U-joints _require_ that the transmission be parallel to the rear-end pinion
shaft. They can of course be offset, but the input and output shafts must be
parallel to each other. You get vibration otherwise.
Is the input shaft parallel to the output
10:17 AM
To: ev@lists.evdl.org
Subject: Re: [EVDL] Vibration
U-joints _require_ that the transmission be
parallel to the rear-end pinion shaft. They can
of course be offset, but the input and output
shafts must be parallel to each other. You get vibration otherwise.
Is the input shaft parallel
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
Subject: Re: [EVDL] Vibration
Sounds like you are doing the parallel shafts part correctly. Does not matter
if the vehicle is level, just that the shafts are parallel to each other.
Are they parallel side-to-side as well? This is a bit tougher to measure, but
it is as important.
Bill D.
At 09:27
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,
Even more common is bad universal joints in the drive shaft. Check them by
reaching under the car and twisting the shaft by hand, you are seeking some
slack but just barely enough to feel. and not much. If you can see the
movement it is too much. Luckily, the replacement of the joints is easy and
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.
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
Message -
From: Brett Davis via EVmailto:ev@lists.evdl.org
Cc: Electric Vehicle Discussion Listmailto:ev@lists.evdl.org
Sent: Tuesday, May 27, 2014 4:30 PM
Subject: Re: [EVDL] Vibration
Hi Roland,
I suppose that the step involving jacking the rear wheels off grade
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
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.
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