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Ford 9N, 2N & 8N Discussion Forum
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CARB SWEAT

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RAYMAN

07-31-2003 07:27:04




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I just restored a 1950 8n. I got everything going, but the carb sweats and causes the engine to run rough. Any ideas how to keep it from supercooling the fuel?




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Fast Ed Ohio

07-31-2003 23:58:52




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
You might try a little dry gas in the old gas tank, after 12 years of running my 8n in all weather in ne ohio I have never had a sweat carb problem.



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Denton

07-31-2003 17:43:27




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
I would think that the air would have more than enough time to warm up as it passed on through the intake. Mine freezes if the temp outside is below about 45 and the air is humid. Someone spoke about adiabatic cooling which reminded me of those three semesters of thermodynamics. I thought that was really hard stuff. Might wan't to check fuel flow or sparks. Good luck.



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duey

07-31-2003 11:54:51




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
Air temp can drop as much as 100 degrees F. & that's primarily due to fuel vaporization. No provision for dealing with on these tractors. As was mentioned by others, you can wait a bit and let the manifold heat work it out. Since the cold comes from the inside, a blanket won't do any good. Heated intake is the answer. You could build a heat muff and with a valve in the intake tube, er.... ah... naw! too much monkey business!! duey

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Steve in Vermont

07-31-2003 08:19:53




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
Most carbureted aircraft engines are equipped with carburator heat to prevent/melt accumulating ice in the carburator throat. There's something called adiabatic cooling, in which the lower pressure in the venturi lowers the temperature of the incoming air; sometimes so much so that the moisture in the air freezes and accumulates. It can severly restrict the output of the engine. Most airplanes allow you to select intake air that has been routed over hot exhuast pipes to prevent/melt the ice.

We've test run airplane engines on the ground in very hot ambient conditions and had the carburator ice up on the outside in 80 degree temperatures.... Very common.

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Steve in Vermont

07-31-2003 08:23:48




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 Re: Re: CARB SWEAT in reply to Steve in Vermont, 07-31-2003 08:19:53  
Don't know if it's common with tractors.



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Salmoneye

07-31-2003 10:00:35




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 Re: Re: Re: CARB SWEAT in reply to Steve in Vermont, 07-31-2003 08:23:48  
When I first start my 8N in the winter here south of Burlington, I can sometimes get a layer of frost to form on the outside of the carb depending on relative humidity...

Some days, if you let it run for a few minutes you can literally watch the 'heat' radiate down the manifold and melt the carb...Some days I have to shut her down and let the heat get to the carb for a minute before she melts...Usually does not re-ice after restarting...but some days she will...

Salmoneye, In Charlotte

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Evil Steve

07-31-2003 07:57:03




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
Don't sweat the sweat. Won't interfere with anything. It won't supercool fuel either - especially not when the carb's mounted to the manifold. If cooling could do that, how would these tractors even start in sub-zero weather.

The rough running is either an ignition problem or fuel supply/mixture problem.



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Hi....John,PA

07-31-2003 07:37:53




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 Re: CARB SWEAT in reply to RAYMAN, 07-31-2003 07:27:04  
Carburetors get cold sometimes and start to "sweat". Maybe a blanket will help.

Sorta like cold sweats like 50 yr olds get,, sometimes. Other than that, she'sa good one.

Hope this will inspire others to join in with their ideas on how to decifer what I am try'n to say.



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