Re: Frost on the Manifold

Posted by paul on February 15, 2004 at 09:15:52 from (209.23.145.14):

In Reply to: Frost on the Manifold posted by JKC on February 15, 2004 at 07:42:05:

As the gas gets drawn through the carb &
turns into a vapor, it draws heat from the air/
metal/ whatever around it.

this chills the metal of the carb, and causes
frost to form on the metal.

It's a natural deal, the heat loss always
happens. some tractors are known for having
too much heat to the carb, they never frost over
but they might vapor lock. Others are known
for running too cool, and don't vapor lock but
will frost over.

About as much frost can form on the inside as
on the outside, so you have to consider
gasline antifreeze on these machines.

It's often a bigger problem at 40 degrees
when it's real humid rather than in dry air
when it's 10 degrees......

Some machines came with shrouds or
shutters that helped keep or vent extra heat to
the carb.

--->Paul

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