|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
05-05-2020, 06:57 AM | #1 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,749
|
Question: 1940 Ford Radiators.
Hi.
The radiator in my 1941 pickup originally came from my 1940 Ford coupe. It has a pressurised cap. I have seen photos of a vent located top center of the top tank. Mine does not have this. So my question is: Are 1940 radiators normally pressurised? Or are they normally non pressurised and the overflow tube is located in that vent piece at the top? I have a problem with the top tank balooning up. One of the seams has split which I presume is from fatigue due to the movement that happens when it baloons up. If it is supposed to be non pressurised I might rework it to have a vent top dead center. Thanks in advance. Mart. |
05-05-2020, 07:31 AM | #2 |
Senior Member
Join Date: May 2010
Location: upstate SC
Posts: 2,963
|
Re: Question: 1940 Ford Radiators.
49 Fords as most of the 30's and 40's cars/trucks were non pressurized. what pressure cap are you using? 4lbs is about right as it appears your rad has already been converted to a pressure system. still there needs to be a way for the cap to vent out the overpressure and water overfill
|
Sponsored Links (Register now to hide all advertisements) |
|
05-05-2020, 02:11 PM | #3 |
Senior Member
Join Date: May 2010
Location: middle of Iowa
Posts: 647
|
Re: Question: 1940 Ford Radiators.
Even with a new Walker radiator I only use a 7 lb cap on my flathead. If I had an original radiator I'd probably stay at 4lbs. The neck will need to be modified/replaced to accommodate the pressure cap.
|
05-05-2020, 02:28 PM | #4 |
Senior Member
Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,800
|
Re: Question: 1940 Ford Radiators.
40 definitely non pressurized. If it was a 40 radiator, it should have a 91A on the back side of the top tank and cap on angled part, not top. IF pressurized, was done at a later date.
|
05-05-2020, 08:24 PM | #5 |
Senior Member
Join Date: Dec 2013
Location: Waxahachie, Texas
Posts: 949
|
Re: Question: 1940 Ford Radiators.
Flathead radiator upper and lower tanks did not have the necessary built-in reinforcement to withstand any pressurization.
|
05-05-2020, 08:42 PM | #6 |
Senior Member
Join Date: May 2010
Location: Rogersville, TN
Posts: 797
|
Re: Question: 1940 Ford Radiators.
Sponsored Links (Register now to hide all advertisements)
|
05-05-2020, 09:51 PM | #7 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
|
Re: Question: 1940 Ford Radiators.
Actually a 40 would have an 01A embossed in the top tank. Physically it is the same as a 39 or 41.
|
05-05-2020, 11:15 PM | #8 |
Senior Member
Join Date: May 2010
Posts: 2,484
|
Re: Question: 1940 Ford Radiators.
Hi; I found the pressurized rads cooled about 10 degrees better in my stock forty. 4 lb cap. changed to a correct rad for judging and noticed the difference. Newc
|
05-06-2020, 09:02 AM | #9 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,426
|
Re: Question: 1940 Ford Radiators.
The 41A-8100-A & B caps were a product that came out at the close of WWII. The post war cars were equipped with these. The 41A-8100-A/B cap was developed to retrofit back to 1938 on those radiators that had a bung that would work with it. Radiators so equipped would have been replacement parts made after the war with few exceptions.
|
05-06-2020, 09:09 AM | #10 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
|
Re: Question: 1940 Ford Radiators.
|
05-06-2020, 09:12 AM | #11 | |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 8,995
|
Re: Question: 1940 Ford Radiators.
Quote:
Actually no, it would not. A '40 Ford radiator has 91A embossed to the upper tank. The cap is on the slanted end of the top tank. A '41 radiator is (physically) nothing like the '39 or '40. Different size / different shape. The cap is centered on the top.
__________________
"I can explain it for you. However, I can't understand it for you". |
|
05-06-2020, 09:15 AM | #12 |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 8,995
|
Re: Question: 1940 Ford Radiators.
As you surely know, it would not make an engine run cooler. I figured your question to be rhetorical - yes?
It would increase the running temperature of the system before it over flowed but again, it would not aid in running cooler.
__________________
"I can explain it for you. However, I can't understand it for you". |
05-06-2020, 09:39 AM | #13 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,749
|
Re: Question: 1940 Ford Radiators.
Higher pressure makes the boiling point higher.
So higher pressure does not make it run cooler, it just raises the temperature it can run at before reaching boiling point. I found the converse effect in a completely different scenario. On test at high altitude in Colorado. Lets bust out the travel kettle and make a nice cup of tea. It was a waste of time. you can't get the the water hot enough due to the lower air pressure. I can see why lots of people are coffee drinkers. mart. |
05-06-2020, 09:46 AM | #14 |
Senior Member
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
|
Re: Question: 1940 Ford Radiators.
How is the shape different on a 41 radiator from a 40? I have a 41 radiator in my 40 wagon and it bolts in perfect with no interference. I know the filler neck is in the center on the 41 and not on the 40 but how is the overall shape of the radiator different??
|
05-06-2020, 09:51 AM | #15 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,749
|
Re: Question: 1940 Ford Radiators.
Can I get a clarification on something. I just looked and most images of 1941 (emphasis on the 1) pickups show what appears to be a conventional looking cap top center of the radiator. Can anyone tell me if that cap is a pressurised cap or just a filler cap with no pressure mechanism??
Mart. |
05-06-2020, 10:56 AM | #16 | |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 8,995
|
Re: Question: 1940 Ford Radiators.
Quote:
Think about this for a moment... IF they were the same, why would Ford have changed them for '41? Don't ya think they'd simply keep installing the 39/40 piece?
__________________
"I can explain it for you. However, I can't understand it for you". |
|
05-06-2020, 03:48 PM | #17 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,426
|
Re: Question: 1940 Ford Radiators.
They are very similar between 40 & 41 but not the same. The transition years always end up with odd stuff on them. Most 1942 stuff was carried over to the 1946 model year so there is a lot more similarity there. The radiators for the crankshaft mounted fan all had to work with it and Ford just had to have that hand crank available. A lot of aftermarket ones lost the crank hole for good reason. It was more expensive to double core a radiator than just make a simple single core set up.
Ford started out with the 4 lb pressure cap but quickly went up to 7 lb when the cars kept getting heavier. My old 51 Mercs run warmer than lighter cars even though they have a huge radiator. The 7 lb cap just allows it to run hotter without boiling the coolant out. We drank a lot of coffee when I lived up in Colorado. Thank the Lord (and the radar experts) for micro wave ovens. Last edited by rotorwrench; 05-06-2020 at 03:57 PM. |
05-06-2020, 03:50 PM | #18 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
|
Re: Question: 1940 Ford Radiators.
Yes I do know. I was responding to Newc's post. He implied that the pressurized radiator cooled better. And it may have, but not because it was pressurized
|
05-06-2020, 07:13 PM | #19 |
Senior Member
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
|
Re: Question: 1940 Ford Radiators.
|
05-06-2020, 07:21 PM | #20 |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 8,995
|
Re: Question: 1940 Ford Radiators.
A BIT narrower.
__________________
"I can explain it for you. However, I can't understand it for you". |
|
|
Sponsored Links (Register now to hide all advertisements) |
|