[AT] oil change

[william.neff.powell at comcast.net]

>From little chemistry I had in college I always thought that the frost on the carb was from the vaporization of the gasoline. I remember that when a liquid crosses the phase barrier to a gas it takes a lot of energy to cross... So, as with freon, when gas evaporates, heat energy is taken during the conversion which cools off the carb. 

Also, many old tractors do not have heat risers, so, the dense cold air coming in does not  help the gas evaporate, so, you stall out unless you force more fuel in by putting on the choke. Eventually the manifolds heat up and your fine, slow speeds, low wind.. For an old tractor lover this is a minor inconvenience, but probably unacceptable for most auto drivers zooming down the road at 60 cooling off their manifolds. 

As far as the injectors, aren't most of them spraying in right at the manifold near the head? That area probably heats up fast. 





 -------------- Original message ----------------------
From: Ralph Goff <alfg at sasktel.net>
> 
> ----- Original Message ----- 
> From: "Larry D Goss" <rlgoss at evansville.net>
> To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
> Sent: Friday, December 07, 2007 11:40 AM
> Subject: Re: [AT] oil change
> 
> 
> > Question of the day -- does carburetor icing occur on fuel injected 
> > engines?
> > :-)
> 
> Hi Larry
> If icing does occur in fuel injected engine I have never noticed it. My 97 
> Blazer starts and runs smoother than any carbureted engine I have ever 
> known. No stumbling or hesitation, no black smoke and stalling. I don't know 
> how they do it but it works.
> 
> Ralph in Sask. 
> 
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