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08-18-2018, 11:19 AM | #1 |
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Temperature Rises after shutdown
I have been working on getting the 30 CCPU more reliable. It only was driven 1000 miles since 2002. I have 250 miles in two weeks. It idles nicely, and runs at 45 to 55 mph very well.
Outside temperature about 95, after a 20 minute run at 45 to 50 mph, spark fully advanced, the temperature is about 185 to 190. I park it in front of my garage and the temperature will continue to climb until it reaches 212 and it will puke out some water from the overflow. This has happened several times. Any thoughts? Jack |
08-18-2018, 11:46 AM | #2 |
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Re: Temperature Rises after shutdown
The syphon cooling system in a Model A is working whether the car is running or not. What is not working is the water pump and radiator fan. Syphon moves about 35 to 36 GPM. Water pump is really only any help at higher speeds.
Are you using a thermostat? Are you using a temperature gauge or portable temperature gun? Out flow at the very top of engine, above water pump, should have the warmest coolant. Inflow at bottom of engine/radiator normally would be about 20 degrees cooler than coolant at the out flow, top of engine. If your temperature readings are correct, I would be concerned about some kind of obstruction that could be restricting the syphon effect. |
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08-18-2018, 12:12 PM | #3 | |
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Re: Temperature Rises after shutdown
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Thanks, |
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08-18-2018, 02:23 PM | #4 | |
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Re: Temperature Rises after shutdown
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If your running 180 degree thermostats, they might not be fully open until 200 degrees. Water boils at sea level at 212 degrees. The higher above sea level you are, the lower the boiling point of water. The higher your temperature goes the more chance of boiling. Boiling water (now a vapor) in your block will not cool your engine. You need a fluid. Straight water cools better than anti-freeze. Boiling water within your engine block could also cause oil flash on your cylinder walls and engine failure. |
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08-18-2018, 12:01 PM | #5 |
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Re: Temperature Rises after shutdown
Temp going up on shutdown is not unusual. You may be overfilling the radiator. I filled mine up and it pucked out water, I refilled it again and it did the same so, I let the car set the level of the radiator. I stuck a stick in to see where the liquid level was and it was about and inch above the radiator core! So I left it that way! All is well for me, no pucking and no over heating. let us know what U do!
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08-18-2018, 12:03 PM | #6 |
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Re: Temperature Rises after shutdown
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Last edited by Y-Blockhead; 08-18-2018 at 12:19 PM. Reason: Correct grammar... |
08-19-2018, 01:24 AM | #7 | |
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Re: Temperature Rises after shutdown
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What you have observed happens in every engine when it is turned off and always has. That said, I think your running temp is a little high so that the rise that happens after shut down takes yiou past the boiling point. Antifreeze also raises the boiling point of the coolant. If you're not running any, your problem about overflow might be history just by adding antifreeze. I'd verify that your radiator is up to scratch too.
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08-18-2018, 12:33 PM | #8 |
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Re: Temperature Rises after shutdown
Since it did not run much for a long time, I would flush the radiator and then flush the engine both ways. From the bottom hose up with the radiator disconnected and then down with the bottom hose loose...then flush the radiator...disconnected from the engine. Run water until it runs clear. If you can use a power flush of some sort, take the water pump off and flush the head really well also...then run 50/50 premixed antifreeze...Just my humble opinion...Ernie in Arizona
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08-18-2018, 07:04 PM | #9 |
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Re: Temperature Rises after shutdown
"the temperature is about 185 to 190"
Your baseline temp is too high to start with. Why are you running full advance |
08-18-2018, 07:49 PM | #10 |
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Re: Temperature Rises after shutdown
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08-18-2018, 11:33 PM | #11 |
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Re: Temperature Rises after shutdown
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08-19-2018, 11:01 AM | #12 |
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Re: Temperature Rises after shutdown
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08-18-2018, 07:10 PM | #13 |
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Re: Temperature Rises after shutdown
I flushed the cooling system with an oxalic acid flush, water was bright green on draining. A fair amount of sludge also came out. Used the sodium bicarbonate neutralizer and drained again. Water was black with a fair amount of sludge. Flushed the radiator.
Filled the system with water and took a test drive. Now it wants to boil over after 15 minutes at 45 mph. Parked and let it cool and could hear the water boiling in the engine. Started to drive home, it heated up immediately to boiling. At a stoplight, it backfired a few times when I started up then nearly died. I pulled into a parking lot and let it cool. Rough check on the timing indicated it might be a little slow but but within adjustment of the spark lever. Drove it home slowly, still at 212 degrees on the guage and boiling in the engine when I pulled it up to the garage. The exhaust manifold is pretty hot, and I am thinking that the condenser might be a problem because of the heat. After it cooled, I checked the spark from the coil. Nice strong spark with a little yellow but mostly blue. It will jump 3/4". Any thoughts.... |
08-18-2018, 07:40 PM | #14 | |
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Re: Temperature Rises after shutdown
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Take out those thermostats. |
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08-18-2018, 07:51 PM | #15 |
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Re: Temperature Rises after shutdown
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08-18-2018, 07:31 PM | #16 |
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Re: Temperature Rises after shutdown
Sounds like the rad tubes need to be rodded. I'm confused as to two thermostats. Are they both installed in the system at the same time?
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08-18-2018, 07:53 PM | #17 |
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Re: Temperature Rises after shutdown
I must have used the wrong words. There are no thermostats...only thermometers. One on the dash and one one the motometer,
Last edited by Baypac; 08-18-2018 at 08:00 PM. Reason: left out info. |
08-18-2018, 09:11 PM | #18 | |
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Re: Temperature Rises after shutdown
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08-18-2018, 09:12 PM | #19 | |
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Re: Temperature Rises after shutdown
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08-18-2018, 07:46 PM | #20 |
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Re: Temperature Rises after shutdown
You were running too lean! Open the GVA a little more.
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