Re: (ET) A Cause of Poor Lift Performance

["David Roden" <etpost drmm net>]

On 27 Jan 2015 at 17:57, Chris Zach wrote:

> On 1/27/2015 10:55 AM, Konstanty, Walter (GE Energy Management) wrote:
> >  The lift motor was out of a GM Cadillac window motor from what I
> >    recall..... not exactly made for this duty.
> 
> Buick. 

And I heard it was from a Corvette.  ;-)  Don't recall from whom; maybe 
Bill 
Gunn?

My guess is that GM used the same motor in dozens of different models, 
probably for many model years.  

However, the ET was designed a long time ago.  I have no idea how much 
GM's 
window lift motors may have changed since then.  How many of the old 
design 
are now left in the boneyards is anybody's guess.

There are few times that I think an ICE tractor has more going for it than 
an ET does, but I have to admit that my ET's lift looks like a hack job 
compared to the smooth, powerful, reliable hydraulic lift on my neighbor's 
midsize Deere (?).  

Maybe a linear actuator could be adapted?  I seem to recall someone 
mentioning that here quite a few years back, but don't remember what 
became 
of the attempt.

> ... the GE motors had the main gear assembly as a solid unit... some of
> the GM models, the gear actually has a big spring in it that connects
> the outside of the gear to the pinion on the end ...  the motor can
> start to "spin up" and load up the spring before lifting. 

My guess is that GM intended that more as a safety feature than as a 
performance feature.  It gives the passenger a little more of a chance if 
he 
gets his hand in the way of a closing window.  But that's just a guess; 
I'm 
not an automotive engineer.


David Roden - Akron, Ohio, USA

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