| Dual Drive Electric Wipers [message #294230] |
Sat, 23 January 2016 14:31  |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
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Having ditched my hydraulic wiper motor and hacked the mount bracket I needed to come up with a wiper system.
These are working pretty good. After I get the correct Delphi connectors installed it should be street legal.
http://www.gmcmhphotos.com/photos/g6903-wipers.html
Also got some Lumina wiper arms. At Harbor freight - next to the step drill - there was a set of stepless drills with the same taper.
That worked nicely for finishing the tapered hole after using the step drill to wallow it out.
JP
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| Re: [GMCnet] Dual Drive Electric Wipers [message #294329 is a reply to message #294313] |
Sun, 24 January 2016 17:41  |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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I remember back in the '60s or early '70s the transit buses in Muncie had the independent wipers...aren't they still that way on buses and big trucks? If you connect the 2 with a tie rod you will have to sync the motor crank throws to the same clock position or you may have some wild wiper action if they don't bind. Like the late '90s GM truck wiper linkage that can be adjusted out of alignment rather easily but is hard to get back just right again.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Dual Drive Electric Wipers [message #294338 is a reply to message #294310] |
Sun, 24 January 2016 18:56 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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JP,
Just one question that I'm not sure I can tell from the photo: Did you
move the passenger side pivot to the outside so the passenger can actually
see through the swept arc?
Ken H.
www.gmcwipersetc.com
Jp Benson wrote on Sat, 23 January 2016 14:31
>> Having ditched my hydraulic wiper motor and hacked the mount bracket I
> needed to come up with a wiper system.
>> These are working pretty good. After I get the correct Delphi
> connectors installed it should be street legal.
>>
>> http://www.gmcmhphotos.com/photos/g6903-wipers.html
>>
>> Also got some Lumina wiper arms. At Harbor freight - next to the step
> drill - there was a set of stepless drills with the same taper.
>> That worked nicely for finishing the tapered hole after using the step
> drill to wallow it out.
>>
>> JP
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Dual Drive Electric Wipers [message #294355 is a reply to message #294230] |
Mon, 25 January 2016 08:22 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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8 years of about 80 miles each work day on MCI transit buses front seats got me used to out of sync wipers. Sometimes, the driver would set them at different speeds, other tinmes they were 'close. One way to handle it is to see how long it takes to determine which is going faster. Note that this is an exercise for passengers only, not operators.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Dual Drive Electric Wipers [message #294367 is a reply to message #294230] |
Mon, 25 January 2016 10:24 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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You >could< put a rheostat in series with one motor, and it will work as long as the load is unchanged. Every time the rain increases or slackens, it won't be correct. Stuff an ammeter in line with the motor, sweep the windshield dry, then dampen it, then wet it... you'll see what I mean.
Now, the Truly Suave might well put Pabst AC motors (synchronous motors) on each wiper, get an inverter to run them, and a varispeed drive like the ones used for airconditioner fans, and use it to vary the wiper speed... in sync. I'm just gonna soldier on with the stock setup as long as the hydraulic motor survives.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Dual Drive Electric Wipers [message #294377 is a reply to message #294367] |
Mon, 25 January 2016 11:19 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
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Senior Member |
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Johnny Bridges wrote on Mon, 25 January 2016 10:24You >could< put a rheostat in series with one motor, and it will work as long as the load is unchanged. Every time the rain increases or slackens, it won't be correct. Stuff an ammeter in line with the motor, sweep the windshield dry, then dampen it, then wet it... you'll see what I mean.
Now, the Truly Suave might well put Pabst AC motors (synchronous motors) on each wiper, get an inverter to run them, and a varispeed drive like the ones used for airconditioner fans, and use it to vary the wiper speed... in sync. I'm just gonna soldier on with the stock setup as long as the hydraulic motor survives.
--johnny
Mechanical load variance would have an effect on RPM. But then both wipers would be affected similarly. The only time it really matters is during continuous wiper operation so the resistors (hi & lo speed) would have to be tuned during a good rainstorm. An interesting exercise but not too high on my agenda. Another issue is that the two wipers have slightly different sweep angles and thus different mechanical loads. I'll wire things up pretty soon and see what actually happens. Variable speed synchronous motors - now that is exotic.
If you need a spare hydraulic wiper motor in your armory I've got one. They do last a long time.
JP
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| Re: Dual Drive Electric Wipers [message #295307 is a reply to message #294230] |
Tue, 09 February 2016 18:26 |
davidlive
Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...
Karma: -1
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If i might ask, what switch did u use ? do you have an link ?
David
78 Royal #749
74 #136
Oversteer is when you hit the wall with the rear of the car, understeer is when you hit the wall with the front of the car. Hp is how fast you hit the wall, and torque is how far you take the wall with you when you hit it.
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| Re: [GMCnet] Dual Drive Electric Wipers [message #295339 is a reply to message #295331] |
Wed, 10 February 2016 10:10 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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How many remember the vacuum wipers run off of the fuel pump?
Many cars had a second diaphragm on the top of the fuel pump. The engine
vacuum was routed to that enroute to the wipers. It really did work --
though certainly not as well as electric wipers. The wipers merely slowed
on hills, not stop completely. :-)
Ken H.
On Wed, Feb 10, 2016 at 8:30 AM, Pete Smith wrote:
> Matt Colie wrote on Mon, 25 January 2016 11:26
>> My really truly Army Surplus Jeep had the ultimate of dual drive wipers.
>> There was a vacuum motor for the driver that would stop the wipers when
> climbing hills, but the passenger had a crank.
>> His were more dependable.
>>
>> Matt
>
>
>
> My father once told me that not long after the War (WWII) he had a car
> that had vacuum wipers........
> He had a low opinion of them .....when you tried to accelerate and
> overtake anyone they stopped working.
> In Scotland, this was a problem.
>
> Pete
> --
> Cary, NC
>
> No Coach yet but decided it will be wet bath with Sully or 4 bag system.
> perhaps a 1978 Kingsley....
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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