Hello Dennis, In neutral the drive line is not turning, so it is something else. If the motor has a pilot shaft and turning a accessory unit, check that. Also check the motor coupler. My EV first came with a set screw coupler that had four set screws place 90 degrees apart all at the same length. Had vibration in this coupler, replace the set screw that presses against the key way which was sticking out further. Kept replacing that set screw until the vibration went away.
Also I use a tool steel harden key instead of the soft ones in the motor shaft key way. Any time a set screw drive is used, it is best to use a Locktite Compound that is design for shafts. Torque each set screw evenly and run test the motor with coupler only. This set up ran ok for ten years and replace the motor coupler with a taper lock coupler. Took the coupler, flywheel and pressure plate to a shop that does engine balancing. Some electric motor shops also can do this balancing. They will first run the coupler first. The flywheel had the tooth gear remove and machine the thick edge off and the back of the flywheel until it was balance for 10,000 rpm. Then the taper lock coupler, flywheel and pressure plate was all assembly and balance as a assembly. They then mark the location of each unit in relation to each other. When you assemble these units, make sure the assembly marks are line up. Some times the original flywheel and pressure plate that was on a engine or purchase as a set, has these alignment marks which may be white paint. Make sure these are line up. Also some flywheels are design to balance a engine in it self. These flywheels are call external balance. Use a internal balance flywheel for a balance motor. Some times the external balance flywheels can be balance if the bolt pattern on flywheel are space evenly. Some external balance flywheels have a uneven space pattern design to fit a engine crank flange in a certain way. Roland ----- Original Message ----- From: Pestka, Dennis J via EV<mailto:[email protected]> To: Daniel Busby<mailto:[email protected]> ; Electric Vehicle Discussion List<mailto:[email protected]> 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 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://www.evalbum.com/1366> http://evalbum.com/3715<http://evalbum.com/3715> From: Daniel Busby [mailto:[email protected]] 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 <[email protected]<mailto:[email protected]<mailto:[email protected]%3Cmailto:[email protected]>>> 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://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... 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