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10-29-2020, 02:37 PM | #1 |
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flathead engine temps?
I have a rebuilt '52merc with 60thou rebore and stock heads, dual 94s, pcv....
new alum rad, 16" electric fan..............but.......... with the engine running for 20 minutes the gage says 190f the oil press says 60psi.. The coolent level is about 1/2" above the rad core. When I shoot the infrared temp meter at the top hoses it reads 167f ? When I shoot the bottom hoses it reads 185f ? If the water flow is down through the rad, shouldn't it be cooler at the bottom hoses ? The engine doesn't overheat and these readings seem constant. Am I thinking that the flow is backwards or just stupid?? |
10-29-2020, 02:54 PM | #2 |
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Re: flathead engine temps?
Very interesting, First at what rpm is the 60lb oil pressure, seems very high. Yea I agree with you the upper radiator hoses should be at the hi temp. I like to run my engines between 180/200 for best economy and longevity
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10-30-2020, 12:18 PM | #3 |
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Re: flathead engine temps?
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10-29-2020, 02:57 PM | #4 |
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Re: flathead engine temps?
Don't shoot the hoses. Shoot the radiator right under where the top hoses connect, and at the radiator just above the hose connection. That should show a temp drop af maybe 20 degrees.
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10-29-2020, 03:05 PM | #5 |
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Re: flathead engine temps?
My rpm was at 1000 for the 60psi, it drops to 45lbs at 500rpm idle. I shot the hoses and the rad tanks and the readings were the same??? I always thought that if things were normal
you should see a drop of 20degrees from the top to the bottom of the rad with the fan working properly! But not the other way round....any other thoughts?? |
10-29-2020, 03:17 PM | #6 |
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Re: flathead engine temps?
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10-29-2020, 03:33 PM | #7 |
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Re: flathead engine temps?
You are right so I did take the temp readings at the thermostat housing and at the water pump inlet castings, and those I my posted results???
I think maybe I have reversed water pumps (just kidding). but that is what it seems like, I have never seen an engine with temps higher at the bottom of the rad??? |
10-29-2020, 05:36 PM | #8 | |
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Re: flathead engine temps?
Quote:
YES in all the old Fords the HOT water is moved out the bottom hose connections up through the radiator into the top tank. From the top tank through the top hoses and back into the engine. G.M.
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10-29-2020, 05:56 PM | #9 | |
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Re: flathead engine temps?
Quote:
I AM SKEPTICAL THAT IT'S TRUE. That means it wouldn't be able to pump water if it was low on coolant at all. Last edited by WABOOM; 10-29-2020 at 07:15 PM. |
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10-30-2020, 07:52 AM | #10 |
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Re: flathead engine temps?
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10-30-2020, 09:36 AM | #11 |
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Re: flathead engine temps?
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10-30-2020, 12:25 PM | #12 |
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Re: flathead engine temps?
I stick with my xplenation. G.M.
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10-30-2020, 12:32 PM | #13 |
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Re: flathead engine temps?
What weight oil are you using?
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10-30-2020, 01:22 PM | #14 | |
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Re: flathead engine temps?
Quote:
"The coolant follows a path that takes it from the water pump through passages inside the engine block, where it collects the heat produced by the cylinders. It then flows up to the cylinder head (or heads in the case of a V-type engine) where it collects more heat from the combustion chambers. It then flows out past the thermostat (if the thermostat is opened to allow the fluid to pass), then through the upper radiator hose and into the radiator. The coolant flows through the thin, flattened tubes that make up the core of the radiator and is cooled by the air flow through the radiator. From there, it flows out of the radiator, through the lower radiator hose, and back to the water pump."
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10-29-2020, 06:06 PM | #15 |
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Re: flathead engine temps?
Tell us why you are stating false information. We deserve to know why.
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10-29-2020, 06:24 PM | #16 |
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Re: flathead engine temps?
When I had similar issues while checking my flathead I found that I needed to move the infrared gun further away from the ignition wires. I was getting electrical interference that was skewing the numbers. Also, the guns work better on a non-reflective surface. You can use duct tape / painters tape for target areas.
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10-29-2020, 06:52 PM | #17 | |
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Re: flathead engine temps?
Quote:
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10-29-2020, 06:56 PM | #18 |
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Re: flathead engine temps?
Take those temp readings after you drive it on the road. Are your lower hoses somehow restricting flow?
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10-29-2020, 10:12 PM | #19 |
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Re: flathead engine temps?
I still don't get the hi oil pressure. Crank and bearings won't last long.
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10-29-2020, 10:14 PM | #20 |
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Re: flathead engine temps?
You also might have installed the wrong oil pressure sensor. Check and see.
Also, are you using the required restrictor? Read this thread. https://www.fordbarn.com/forum/showthread.php?t=78883 Last edited by 19Fordy; 10-29-2020 at 10:50 PM. |
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