|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-29-2020, 02:37 PM | #1 |
Senior Member
Join Date: Oct 2019
Location: Niagara Falls Canada
Posts: 117
|
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 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
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
|
Sponsored Links (Register now to hide all advertisements) |
|
10-29-2020, 02:57 PM | #3 |
Senior Member
Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 1,627
|
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.
|
10-29-2020, 03:05 PM | #4 |
Senior Member
Join Date: Oct 2019
Location: Niagara Falls Canada
Posts: 117
|
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 | #5 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: flathead engine temps?
I would take the temp reading at the exit of the head where the radiator hose connects, the metal, not the hose itself. And the other reading at the inlet to the water pumps, again, the metal, not the hose itself.
|
10-29-2020, 03:33 PM | #6 |
Senior Member
Join Date: Oct 2019
Location: Niagara Falls Canada
Posts: 117
|
Re: flathead engine temps?
Sponsored Links (Register now to hide all advertisements)
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 | #7 | |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
|
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.
__________________
www.fordcollector.com |
|
10-29-2020, 05:56 PM | #8 | |
Senior Member
Join Date: Jun 2018
Location: Minnesota
Posts: 347
|
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. |
|
10-29-2020, 06:06 PM | #9 |
Senior Member
Join Date: Jun 2018
Location: Minnesota
Posts: 347
|
Re: flathead engine temps?
Tell us why you are stating false information. We deserve to know why.
|
10-29-2020, 06:24 PM | #10 |
Member
Join Date: May 2010
Location: Livonia, MI
Posts: 80
|
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.
|
10-29-2020, 06:52 PM | #11 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: flathead engine temps?
Quote:
|
|
10-29-2020, 06:56 PM | #12 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
Re: flathead engine temps?
Take those temp readings after you drive it on the road. Are your lower hoses somehow restricting flow?
|
10-29-2020, 10:12 PM | #13 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: flathead engine temps?
I still don't get the hi oil pressure. Crank and bearings won't last long.
|
10-29-2020, 10:14 PM | #14 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
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. |
10-30-2020, 07:52 AM | #15 |
Senior Member
Join Date: Feb 2020
Location: BC Canada
Posts: 573
|
Re: flathead engine temps?
|
10-30-2020, 08:55 AM | #16 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
Re: flathead engine temps?
Will D: Excellent point. "Going with the flow" as described is incorrect.
Perhaps that was a test to see who's paying attention. To pass the test just watch the water flow with the radiator cap removed. |
10-30-2020, 09:36 AM | #17 |
Senior Member
Join Date: Jun 2018
Location: Minnesota
Posts: 347
|
Re: flathead engine temps?
|
10-30-2020, 09:49 AM | #18 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
Re: flathead engine temps?
Question: Is it at all possible that the pump impellors are faulty in some strange way?
|
10-30-2020, 11:51 AM | #19 |
Senior Member
Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 1,627
|
Re: flathead engine temps?
Even if you rotated the pump pulleys the reverse direction they would still pull water from the center of the pump (bottom of the radiator) and push it out the top of the heads.
The problem here is most certainly the instrument being used to measure the temperature, or how it is being used. |
10-30-2020, 12:00 PM | #20 |
Senior Member
Join Date: Jun 2018
Location: Minnesota
Posts: 347
|
Re: flathead engine temps?
I suspect the radiator in partially clogged.
|
10-30-2020, 12:18 PM | #21 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
|
Re: flathead engine temps?
|
10-30-2020, 12:25 PM | #22 |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
|
Re: flathead engine temps?
I stick with my xplenation. G.M.
__________________
www.fordcollector.com |
Sponsored Links (Register now to hide all advertisements) |
|
10-30-2020, 12:32 PM | #23 |
Senior Member
Join Date: Oct 2016
Location: harpursville ny
Posts: 1,040
|
Re: flathead engine temps?
What weight oil are you using?
|
10-30-2020, 12:47 PM | #24 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
Re: flathead engine temps?
WABOOM: Maybe there's a ton of sediment sitting in the bottom of the radiator.
|
10-30-2020, 12:49 PM | #25 |
Member
Join Date: Sep 2020
Location: San Angelo Texas
Posts: 56
|
Re: flathead engine temps?
There is nothing wrong with your oil pressure especially if you're running a 50 weight oil. You should be running 30 weight, especially this time of year.....I run it year round.
Too many people freak out on oil pressure. |
10-30-2020, 01:22 PM | #26 | |
Senior Member
Join Date: May 2015
Posts: 8,137
|
Re: flathead engine temps?
Sponsored Links (Register now to hide all advertisements)
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."
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
|
10-30-2020, 06:29 PM | #27 |
Senior Member
Join Date: Oct 2019
Location: Niagara Falls Canada
Posts: 117
|
Re: flathead engine temps?
OK guys........I have used the infrared temp reader correctly ( shooting non reflective areas,
and shooting tanks, casting, etc) AND with the cap removed on my NEW radiator I can see the water is flowing from the heads up into the top rad tank.. I also have independent mechanical gages mounted on the engine to verify the electronic ones. Their are no tricks here, I just thought someone might have a suggestion on why I am getting this backward temperature reading! |
10-30-2020, 06:51 PM | #28 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: flathead engine temps?
Have any of you ever heard of "water jet" cutting steel.?? This is where water under hi pressureseveral hundred lbs, is forced through a very small hole. Having too much oil pressure in my firs stock car engine I broke the crank oil under hi pressure coming out of the main bearings cut a grove in the crank shoulder. After a dozen races it broke, "Cavitation erosion ". Flow is more important than pressure.
|
10-30-2020, 08:48 PM | #29 |
Senior Member
Join Date: Sep 2016
Location: sydney australia
Posts: 1,033
|
Re: flathead engine temps?
read what our friend said [ the coolant is about 1" over the core " not full so my guess is where he is shooting the hoses there is NO coolant only air so if he tops off the coolant and retries bet he gets totally different readings Air pockets can create absolute havoc they cause overheating yet read cold [due to lack of heat transfer] and worst of all if they shift rapid temp change and cracking
|
10-31-2020, 01:30 PM | #30 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,942
|
Re: flathead engine temps?
Water jet cutting requires 20K to 50K psi to cut steel. I find if hard to believe that 60 psi oil pressure can "cut" and destroy a crank even if it doesn't have radiused fillets at the journals. Machining a radius on the journals reduces stress. However, I am not an expert but have seem 6 in. thick steel water cut. It's amazing.
|
10-31-2020, 06:01 PM | #31 |
Senior Member
Join Date: Oct 2019
Location: Niagara Falls Canada
Posts: 117
|
Re: flathead engine temps?
perhaps that is a good idea, I maybe shooting at steam pockets?? so I will fill the rad to the ver, very top and get back to this forum with the results after that.......
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|