Re: Re: Re: Re: Re: ? for randy hall + others abou

Posted by Steve - IN on September 10, 2003 at 20:42:39 from (12.222.30.13):

In Reply to: Re: Re: Re: Re: ? for randy hall + others about co posted by Guy Fay on September 10, 2003 at 19:20:44:

Guy,
I think the distillate tractor engine was run with shutters -- higher temp -- because the heavier fuel is harder to fire --kerosene has more carbons than gas -- much like a Diesel wants to run hotter than a gas engine -- Diesel fuel almost has more carbons than gas and kero put together. Point is, the distillate doesn't fire as hot as pump gas when all other things are equal. Reason is because it has more carbons per hydrogens per molecule than gas. Carbons don't burn fast, hydrogens do.

Carb heat is used at altitude. Promise you! You can fall out of the sky at 10,000 ft as easily as 500 ft on final. Been there, done that (65F ambient, but with high humidity - got carb ice - nearly bought the farm). The trick with icing is the 20# between temp and dew point. If fuel or liquids like water falls out of suspension with air in a carb or manifold, it creates ice when temp and dew point are <=20 of one another. If it falls out of suspension at higher temps or lower dew points, you still have a fuel separated from the air and it simply makes lousy combustion at high temp/ low humidity instead of ice at low temp / high humidity. Same coin, just two different sides of it -- liquid or solid. What you want from a carb is a mist - air and fuel mixed -- not air and a buncha dribbles.

They call it the Joule-Thomson effect - which basically means that temp drops when fuel meets air through a venturi. Sure, cold air is more dense, but in relation to what? Heavier fuel (kerosene) still drops out of suspension in cold or hot air faster than lighter fuel -- gasoline --if all other things are equal. Therefore, the need to reverse that cooling effect is greater with kerosene than it is with gas. Carb heat - manifold heat - is simply a way to counter the Joule-Thomson effect.

Common sensical proof of all the above is that I bet you can find a lotta guys here who have seen frost form on their tractor carbs (gas or kero) on a dew laden summer morn. It's not rare.

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