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08-30-2020, 07:34 PM | #1 |
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Thread - I screwed up
1950 Mercury-shinny new stroker engine - at the bottom of the stock radiator is an drain petcock. As I needi a thermoratic switch to control the new electric fan, I had the radiator shop add a bung to the bottom radiator tank of the same thread as the drain petcock, which they did.
I Amazoned a good looking 170° thermo-switch, learning that 'good looking' isn't a good way to specify threads. I doesn't fit, likely metric. Can someone tell me what the threads are? Like 3/5NPT or some such so I can reorder a proper switch, i.e. one that actually fits. Thanks I'm getting closer to engine swap scheduled for Sept28 - I need to figure out changing the 4bbl Edelbrock carb for throttle linkage to the pass side as its now on the drivers side. Who sells linkages? |
08-30-2020, 08:10 PM | #2 |
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Re: Thread - I screwed up
Is the bottom of the radiator the cool spot or the hot spot. I don't know, but if it's the cool spot aren't you getting the wrong readings for the fan.
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08-31-2020, 06:12 AM | #3 |
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Re: Thread - I screwed up
At the bottom, the water has already been cooled by making it's pass through the radiator. You need the fan when the water is getting TOO warm, which will be up top where it is exiting the engine, headed toward the radiator at it's warmest temp. You might want to make sure the bung is mounted LOW on the top tank, down close to the core, in case your radiator system likes to keep the water low in the top tank. I think I would also mount it near the RIGHT (Passenger) side inlet, because most flatheads like to run a few degrees warmer on the right side than on the left. But WTH do I know? DD
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08-30-2020, 08:25 PM | #4 |
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Re: Thread - I screwed up
>>>3/5NPT or some such>>>
No such. Better check with the shop which NPT fitting they installed. Jack E/NJ |
08-30-2020, 09:06 PM | #5 |
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Re: Thread - I screwed up
a thread pitch gauge would be best, they are cheap, you will use it again. if not, grab some stuff and try to thread it in there! most likely 1/8" pipe thread, like a drain petcock, or 1/4 " pipe, like an air tool fitting. just try a few things, with your fingers, no wrench, dont wreck it, and figger out what size you have
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08-30-2020, 09:40 PM | #6 |
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Re: Thread - I screwed up
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08-31-2020, 06:24 AM | #7 |
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Re: Thread - I screwed up
why not use the senser probe that comes with a thermostat then you can dial in the
temp the fan comes on. With the thermo switch your kind of stuck with its setting. With the probe you stick it right through the radiator fins quick easy. And yes bottom is cool and the top is hot maybe half way up for the sensor. |
08-31-2020, 08:25 AM | #8 | |
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Re: Thread - I screwed up
Quote:
Also agree with the toggle switch override. Have experienced a couple of thermo switch failures...and mine always failed in the "off" position! |
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08-31-2020, 08:48 AM | #9 |
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Re: Thread - I screwed up
Drain petcocks are normally 1/4 npt. Does the drain petcock fit in the new bung?
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09-07-2020, 03:44 AM | #10 | |
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Re: Thread - I screwed up
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While I'm in the minority here regarding sensor location, however I'm quite convinced I'm correct. The contra opinions caused me to think about it. Radiator cooling happens from the fan OR from car speed OR both, even depending upon outside air temperature. The radiator must provide cooling of the water which enters at the top and exits at the bottom. At highway speeds on a cool day moving air provides adequate radiator cooling and the electric fan just isn't needed. Placing the sensor at the outlet of the radiator works properly for that condition. Placing the sensor where water is always hot doesn't cover the high speed cool day situation. I will report results once I get the car on the road with it's new engine. |
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08-31-2020, 08:56 AM | #11 |
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Re: Thread - I screwed up
Here's an idea.
https://www.youtube.com/watch?v=NVysqXm81aw Years ago I installed an electric fan that came with a thermostatic sensor switch that could easily be attached to the radiator and also controlled the temp. at which the fan came on. There was also a manual switch under the dash to override the sensor. Any reason you can't plug your fitting at the bottom (wrong location) and just install a sensor that mounts on the radiator and can be controlled with a manual switch if desired? Last edited by 19Fordy; 08-31-2020 at 09:03 AM. |
08-31-2020, 09:03 AM | #12 |
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Re: Thread - I screwed up
mines an early girl with one sender so ran the thermo switch of the other head gauge shows one side and can tell when fans cut in so know what the others doing Thermo switch is a grounding type so just piggy backed a ground wire thru a on/off switch for manual control
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09-07-2020, 03:50 AM | #13 |
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Re: Thread - I screwed up
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Paul....Is it more important for the fan to cool HOT water, or to cool water that has already been cooled after going through the radiator? Just curious! DD |
09-15-2020, 06:19 AM | #14 | |
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Re: Thread - I screwed up
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What we are discussing is the source of the air flowing through the radiator fins, how to control it when a greater flow of air is needed. So, Coup,... my answer to your important question: ... it is NOT important to cool water that has already been cooled. But how can that happen that hot water was already cooled? Hot water won't get cooled by the radiator simply because the radiator says "Cool It". If it flows through the radiator without air flow through the radiator fins, hot water entering WILL STAY HOT on exit. I think the water cooling concept muddles our thinking because the dash temp gauge monitors temperature of water leaving the engine. As well it should. Plus the standard fan is a permanent fixture, always providing air flow. One must think of the radiator as a device capable of cooling water if and only if, air is made to flow through the fins, either with car speed or a fan. Come to think, perhaps throttle control could be added to a heat sensor. But officer, the car engine was simply cooling itself. |
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09-15-2020, 04:46 PM | #15 | ||
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Re: Thread - I screwed up
Quote:
Quote:
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09-15-2020, 07:14 PM | #16 | |
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Re: Thread - I screwed up
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Read this pertinent article in Hot Rod... https://www.hotrod.com/articles/tech...itch-location/ It would seem that car manufacturers don't agree on location any more than we do. However I seek an understanding. Last edited by Paul Bennett; 09-15-2020 at 10:18 PM. |
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09-16-2020, 03:02 AM | #17 | |
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Re: Thread - I screwed up
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The only exception is if it were a reverse flow system.
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DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES Last edited by 51 MERC-CT; 09-17-2020 at 03:43 AM. |
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09-16-2020, 03:19 PM | #18 | |
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Re: Thread - I screwed up
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https://www.hotrod.com/articles/tech...itch-location/ I don't know....possibly a different hobby like knitting, where there are far fewer difficult technical decisions to worry about. |
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09-07-2020, 06:10 AM | #19 |
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Re: Thread - I screwed up
“Placing the sensor where water is always hot doesn't cover the high speed cool day situation.“ If your traveling at road speed on a cool day, the motor won’t get the water hot enough to trigger the fan sensor anyway. But, on a hot day in traffic the sensor will trigger the fan and start cooling the water sooner.......Mark
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09-07-2020, 10:51 AM | #20 |
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Re: Thread - I screwed up
This is from the Speedway site " Make sure the fan switch is mounted in the manifold or radiator tank so that the bulb is submerged in the HOT engine coolant."
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