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Discussion Forum
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Thermosiphon operation

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John N

07-03-2001 06:56:12




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Let me try that again --

I have a 1950 Super A that has been sitting for about 20 years. Itís running fine, but the temperature is reaching 200 at the top of the radiator after 15 minutes of mowing. That seems too hot, and I plan on flushing the radiator.

My question is this: I seem to remember that with the radiator cap off a warm engine, you could look in and see the coolant flowing slowly across the top of the radiator. Is that correct, or is my memory wrong?

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Mike K

07-07-2001 05:12:22




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 Re: thermosiphon operation in reply to John N, 07-03-2001 06:56:12  
FYI.............Mike



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Kurt T

07-04-2001 14:51:25




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 Re: thermosiphon operation in reply to John N, 07-03-2001 06:56:12  
I had the same problem on my C. I converted it to a waterpump. Now, engine really smiles under hard work. Doesn't come close to running hot. Cost about $100 and a days work.



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RickB.

07-04-2001 10:11:39




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 Re: thermosiphon operation in reply to John N, 07-03-2001 06:56:12  
Remember, your system relies on temperature gradient to circulate. I don't think 200 deg is too hot for the top tank. The question is, what is the temp @ the bottom? There is no pressure cap to artificially raise the boiling point, so run it. If it doesn't boil, it ain't running hot, period.



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mel

07-03-2001 08:45:13




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 Re: thermosiphon operation in reply to John N, 07-03-2001 06:56:12  
Just a sidebar but all I ever use in any of my tractors and truck for that matter is distilled water and prestone antifreeze mixed 50/50. i have never had any scale buildup problems because of this mix. Works for me.



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Red Dave

07-03-2001 07:20:43




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 Re: thermosiphon operation in reply to John N, 07-03-2001 06:56:12  
Yes, you can see the coolant flowing. The system is not pressurized and has no pump. The key to a thermosyphon system is to keep the radiator full so that the water can circulate by convection currents (gravity). It's OK if a little comes out the overflow when it gets hot. You should also mix the water and antifreeze before you put it into the radiator.
200 deg seems too hot to me also. After all that time, you could have scale built up in the block or the radiator may have some blockage. A good flush may help it out.

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RAW in IA

07-03-2001 14:53:17




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 Re: Re: thermosiphon operation in reply to Red Dave, 07-03-2001 07:20:43  
As to the temperature at the topof the radiator, I' not sure what it should be, but is the return hose to the block hot. It norally is not too hot to hold your hand on with this system, if the radiator is cooling the coolant right. Ifd the return is hot, then the radiator is scaled up or dirty, or the fan is not pulling enough air through it. I may sticka thermometer in the topof my cub and see how hot it runs. I do know that with th C dad had, if the temp guage came off the cold mark, there was something wrong, like too little water to circulate.

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Dick Davis

07-03-2001 23:57:56




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 Re: Re: Re: thermosiphon operation in reply to RAW in IA, 07-03-2001 14:53:17  
How clean is the radiator? When you shine a bright flashlight forward through the radiator can it be seen through the front grill? (Caution: do not do this with the motor running!) Blow water and or air through the fins. It is amazing how much dirt and chaff pack in these machines over the years. Tell us what you find. Dick



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