11-23-2020, 10:29 AM | #21 | |
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Re: Engine upgrade
Quote:
Horsepower = heat. The more horsepower and engine makes the more heat it makes and the more need for cooling capacity. |
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11-23-2020, 11:26 AM | #22 | |
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Re: Engine upgrade
Quote:
The fact that higher-output engines tend to produce more heat is a function of the fact that those engines are consuming more energy overall, not a function of their HP output. |
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11-23-2020, 01:53 PM | #23 | ||
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Re: Engine upgrade
Quote:
Quote:
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11-23-2020, 02:13 PM | #24 | |
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Re: Engine upgrade
Quote:
If the argument had been something like "well, when you modify the engine you tend to drive it more aggressively, which increases the load on the cooling system, and the original radiators often aren't in top condition, so installing a beefier radiator is a good safety precaution," I don't have a problem with that argument. But it doesn't, like, proceed irrevocably from the laws of thermodynamics. |
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11-23-2020, 02:57 PM | #25 |
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Re: Engine upgrade
Or, just the fact that the cooling system is in-correctly designed.
Water pump scavenging the engine induces cavitation, thermostat missing to control temp and water flow. just observations........J
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11-28-2020, 04:20 PM | #26 |
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Re: Engine upgrade
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11-30-2020, 07:25 PM | #27 |
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Re: Engine upgrade
The high compression head actually makes an engine run cooler. You would think otherwise. As far as the radiator goes, it has more to do with just the comfort of driving than anything. It makes the passenger compartment cooler, for some reason. I thought that, and did not mention it. Then my wife remarked about it.
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12-01-2020, 12:05 PM | #28 |
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Re: Engine upgrade
Good Morning...When the Model A was designed, the engineers lived in Detroit and the surrounding area...so they designed a cooling system that met with their experience. Cars coming to the southwest always seemed to have 'heavy duty' option radiators ordered for them. Also, at least in Southern California and Arizona where I have mostly lived...radiator shops have specialized in building larger radiators for all sorts of cars and trucks...also thermostats...a well tuned Model A will run at different temperatures in different parts of the county at different times of the year. On a cold winter day, maybe 130 or so, on a hot summer day, in the southwest 190 or even 200 was not uncommon. With a bigger radiator and a thermostat...160 to 180 can be maintained, the engine is pretty much happier at 160 in my humble driving experience. Ernie in Arizona
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12-01-2020, 03:30 PM | #29 | ||
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Re: Engine upgrade
Quote:
No mention of natural thermosyphon water flow that overcomes the cavitation? No need to control the temperature with this system. The natural syphoning process pushes the water to the upper tank where it begins the cooling process. Remove the belt from the water pump and drive the vehicle through the hottest of conditions, and you will see that the thermosyphoning system works well. This in a nutshell is why the system works well as stock when the radiator is functioning properly. Quote:
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12-01-2020, 03:34 PM | #30 |
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Re: Engine upgrade
Wouldn't that vary by head? The designer might just as well choose to fill the space with cast iron. Some aftermarket heads did have a reputation for being unusually heavy.
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12-01-2020, 09:03 PM | #31 |
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Re: Engine upgrade
[QUOTE=BRENT in 10-uh-C;1958259]No mention of natural thermosyphon water flow that overcomes the cavitation? No need to control the temperature with this system. The natural syphoning process pushes the water to the upper tank where it begins the cooling process. Remove the belt from the water pump and drive the vehicle through the hottest of conditions, and you will see that the thermosyphoning system works well. This in a nutshell is why the system works well as stock when the radiator is functioning properly.
Brent, you are correct, in fully stock form, everything working as it should. My comment is somewhat cart before the horse. The time of the "T" and "A" probably did not have a thermostat assembly that was usable. And to your point the early "T" had no pump. The factor of the pump placement and possibly inducing cavitation is from physics. By having the pump on the discharge of the engine, you can induce a slightly lower pressure in the water jacket and that can affect the coolants ability to resist cavitation. I have no explanation as to the higher compression , higher HP output producing less heat in the engine unless it is a function of faster burn rate transferring less heat due to time exposure. My coupe with OHV and standard type radiator needs the thermostat to get above 130, or cardboard in the grill. With a 190, it runs there even with the ambient getting over 100 and stuck in traffic. Best, John
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