 source of vibration?, car vibrates at ~ 3k RPM |
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| astronomerdave |
 Apr 22 2009, 11:20 PM
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Member  Group: Members Posts: 69 Joined: 26-January 09 From: Los Angeles, CA Member No.: 9,979 Region Association: Southern California  |
My 914 was converted to an electric vehicle; other than having an electric motor instead of a gasoline engine, the drivetrain is the same as you're familiar with. The electric motor has a hub adapter which matches the bolt pattern of the original flywheel. Then I'm using the orig flywheel, clutch, and transmission. The problem is that somewhere around 3000 RPM the car starts to vibrate (and gets worse with increasing RPMs).
Now at least two or maybe three other guys who did this same conversion had similar vibrations and all of them found that they had troubles with their transmissions. So I jumped to conclusions and thought the same. But I just discovered that I get the same vibration whether driving, sitting in neutral, or sitting with the clutch disengaged. I have my own new theories now but want to hear what some of you other people think. Thanks, Dave p.s. images of the car, including some parts such as the motor, flywheel, etc. can be found here: http://www.halestorm.us/evconstruction.htm |
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| VaccaRabite |
Apr 23 2009, 07:04 AM
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En Garde! Group: Admin Posts: 13,755 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region 
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Are you sure the the flywheel is properly aligned? If that is off, it will cause vibration.
Zach |
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| astronomerdave |
Apr 23 2009, 09:36 AM
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Member Group: Members Posts: 69 Joined: 26-January 09 From: Los Angeles, CA Member No.: 9,979 Region Association: Southern California |
QUOTE(Vacca Rabite @ Apr 23 2009, 06:04 AM)  Are you sure the the flywheel is properly aligned? If that is off, it will cause vibration. No, I'm not sure (and that's one of my suspicions). Below you say "off-center" but centration didn't seem to have an adjustment. There could be wobble, however (ie. the plane of the flywheel may not be orthogonal to the axis of rotation). As for how it connects to the motor, it uses the same 5 bolts as before. The only difference is it is bolting to a hub adapter. Here is a photo (not mine) of the electric motor showing the hub adapter: hub adapter link This photo is from another 914ev'ers blob, http://914ev.blogspot.com/search?q=hub (he has more pictures than I do). And I suppose it is possible that the hub adapter went on incorrectly, too, though very unlikely. I kept the original registration between the pressure plate and the clutch (but did not have anything checked or rebalanced). |
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Posts in this topic
astronomerdave source of vibration? Apr 22 2009, 11:20 PM
yeahmag Dave,
I just sent you an email without reading th... Apr 23 2009, 12:10 AM Jeffs9146 Car may have sat on tires for too long and you now... Apr 23 2009, 07:35 AM
Vacca Rabite
Car may have sat on tires for too long and you no... Apr 23 2009, 07:49 AM Jeffs9146
Your right, :worship: I originaly read it as r... Apr 23 2009, 08:47 AM charliew Are you sure the pressure plate and the flywheel a... Apr 23 2009, 10:08 AM kwales The adaptor wouldn't be the first part made wr... Apr 23 2009, 10:33 AM astronomerdave UPDATE:
First, I properly calibrated by tach and ... Apr 24 2009, 02:50 AM charliew Does it have the input shaft bearing for the front... Apr 24 2009, 08:46 AM astronomerdave
Does it have the input shaft bearing for the fron... Apr 24 2009, 11:36 AM kwales You have many more measurements to do with the fly... Apr 24 2009, 08:53 AM charliew You could put some studs in the adapter and measur... Apr 24 2009, 09:04 AM drive-ability
My 914 was converted to an electric vehicle; othe... Apr 24 2009, 08:07 PM |
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