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12-17-2010, 05:40 PM | #1 |
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Location: Sevierville, Tenn.
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vacuum wiper conversion
I want to convert my 39 Deluxe from vacuum to electric. If any of you are too young to remember driving vacuum wipers, you won't understand that you did indeed have to "drive" them. I had a stock '46 when I was a kid in the Blue Ridge Mountains and keeping snow and rain off the windshield going uphill was an art. Nostalgic, yes. Something I want to repeat, no.
Any experience with kits or dealers would be appreciated. I've already accessed several good dealers from this site and am looking to deal with others who support our cause. |
12-17-2010, 06:55 PM | #2 |
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Location: Orem, Utah
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Re: vacuum wiper conversion
If you are not able to find a "boutique" to get a motor from, here are a couple of cheap ones from WalMac:
12 volt: http://macsautoparts.com/early-v8-el...0R3CHL1077250/ 6 volt: http://macsautoparts.com/early-v8-el...0R3CHL1129687/ They are both universal motors that require some modification to mount. Or, here are some others that you'll pay more for but allege to fit right in: https://secure435.hostgator.com/~dlv...year_choice=39
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
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12-17-2010, 07:38 PM | #3 |
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Re: vacuum wiper conversion
I intend to run an accesory vacuum pump to solve this problem, with one line to the wipers. Does anyone know how effective this arrangement is?
Ah yes, uphill wiping is an art, downhill, you somtimes wonder if the wipers are going to stay connected. |
12-18-2010, 12:13 AM | #4 |
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Re: vacuum wiper conversion
Did you try adding a vacum tank with a one way valve between the intake manifold and the vacum tank and come out of the vacum tank to the wipers Mrv
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12-18-2010, 12:51 AM | #5 | |
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Re: vacuum wiper conversion
Quote:
Well, I thought it sounded like a good idea too so I actually searched for years for the stock vacuum tank Ford made for 42-48 cars hoping it would make my wipers less vulnerable to vacuum loss. I found one and was so excited to install it and try it out. The advantage it gave me was that, when I mashed down on the gas, like when climbing a hill, it gave me about 7 swipes of the wipers before they quit. The unfortunate surprise, however, was that, once they quit, it was about that long again after letting up on the gas before the tank was charged again to get the wipers going again. Darn. It seemed like such a great idea. I took the tank off and prefer to have total control over when the wipers wipe and when they don't. If they stop while going up a hill, I wait until the windshield is good and loaded then just let up on the gas enough to get them to wipe across once to clean off the windshield then carry on up the hill with WOT until I need to wipe again. I've seen several suggest vacuum storage tanks. Although it seems like a good idea, I didn't like it. FYI here's the stock vacuum storage tank I installed:
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 12-18-2010 at 01:14 AM. |
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12-18-2010, 01:23 AM | #6 |
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Re: vacuum wiper conversion
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 12-21-2010 at 07:09 PM. |
12-18-2010, 07:49 AM | #7 |
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Re: vacuum wiper conversion
On the vacuum tank solution. I would think ssize of tank would be deciding factor, too large won't work, too small no advantage, somewhere in between, but I don't know what size that might be.
Old Henry: what are/were the approx dimensions of the tank (orig) you installed? Paul in CT |
12-18-2010, 10:41 AM | #8 | |
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Re: vacuum wiper conversion
Quote:
I don't think the size would make any difference. Whatever time it takes to discharge it pretty much takes to recharge. The real bottleneck to recharging is the small vacuum port below the carburetor. The hose fitting to the tank is larger coming from that port than the fitting going to the wiper motor and larger than the port on the carb. (See illustration) I had a larger hose on that larger fitting but the vacuum to charge the tank still had to go through the small port below the carb. (See the reducer, part 17644, in the illustration.) It may be that if vacuum was accessed through a larger port on the manifold it would charge quicker and work much better. Someday I may try that.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 12-18-2010 at 09:40 PM. |
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12-18-2010, 02:09 PM | #9 |
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Re: vacuum wiper conversion
You can also rig the intake of a decent 6v or 12v tire pump to pull the required wiper vacuum. 8^)
Jack E/NJ |
12-18-2010, 05:26 PM | #10 |
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Re: vacuum wiper conversion
I am using a 2 spd chry---r 6 volt on my 46, works great up in orig place , sw comes out rt neath the divider. 50s style ernie m tx
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12-18-2010, 05:50 PM | #11 |
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Re: vacuum wiper conversion
I think Old Henry has the rightidea. On some of the 70's Fords and maybe Mercs also, there was a vacuum reservoir mounted on the inner fender well. Because the 39 cars are difficult to replace the wiper motor (no good substitute), I tried one of these cannisters on my 39 coupe. It worked well. It was the size of a medium coffee can and kinda looked just like one. It had some sort of check valve. I mounted it under the front floorboard on the pass side. I only removed it when I decided not to travel in the rain anymore.
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12-18-2010, 06:04 PM | #12 |
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Re: vacuum wiper conversion
I used an electric replacement for my '46 made by Newport Engineering. Works fine.
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12-18-2010, 06:07 PM | #13 |
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Re: vacuum wiper conversion
howbout rolling up 2 or 3 extra feet of vacuum line under the dash to use like a small reservoir ?
rich |
12-18-2010, 06:58 PM | #14 | |
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Re: vacuum wiper conversion
Quote:
(Edited to correct erroneous calculations previously posted)
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 12-18-2010 at 09:39 PM. |
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12-18-2010, 07:39 PM | #15 |
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Re: vacuum wiper conversion
volume = pi x radius x radius x length ~ 22/7 x 0.125" x 0.125" x 12" = 0.6 cubic inches per foot of 0.25" id hose.
Jack E/NJ |
12-18-2010, 08:40 PM | #16 |
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Re: vacuum wiper conversion
Any number of diesel powered vehicles may have had a belt driven vaucuumn pump. I know my old LN8000 with V* Cat had one.
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12-18-2010, 09:27 PM | #17 | |
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Re: vacuum wiper conversion
Quote:
So, re-calculating for both the volume of the hose AND my tank (which I also messed up) renders 785 cu.in. for the tank divided by .6 cu.in volume per foot of hose requires 1,308 feet of hose to equal the tank. That's a lot of hose. Thanks for straightening me out.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 12-18-2010 at 09:41 PM. |
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12-19-2010, 08:54 PM | #18 | |
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Re: vacuum wiper conversion
Quote:
The way I see it working is; as the fan belt is always moving the pump is always producing vacuum, therefore vacuum should be constant. Is anyone running one, and if so, how effective are they? |
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12-19-2010, 10:10 PM | #19 |
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Re: vacuum wiper conversion
The 1949-53 Ford had a dual diaphragm fuel/vacuum pump that would provide supplementary vacuum for the wipers. The top diaphragm pumped the fuel and the lower diaphragm pumped the vacuum. Dennis Carpenter has them for $175 but you might be able to find one in an older car junkyard.
There are some cheaper NOS ones on ebay right now.......... Last edited by Cool Hand Lurker; 12-20-2010 at 11:16 AM. Reason: More info |
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