Text from my book "Motorboken" printed in Teknologisk forlag, Oslo. ISBN: 82-512-0133-0 :

The carburator and intake canal works as a "freeze machine" due to gas velocity and vacuum make cold and still more colder with atomized fuel. There are not possible to evaporate the fuel inside by heat of surface such as in intake canal. After the fuelmix are entered in the crankcase, the gas will be expanded and make cold again under induction period by vacuum. The fuelmix get a bit heated up by crankcase compression, but not enough time to evaporate since there are still cold fuelmix inside. In fact are 3 thing who are entered in the cylinder after valve (4 stroke engine) / transfer port (2 stroke engine): fuelmix are allready evapored by heat by compression, liquid drops small diameter from 1/20 to 1/2 mm depent on carburator construction, a thinn fuelfilm at surface at canal before valve/transferport. With increased air temperature the mixture will be better such as in fair weather. Heat by piston will transfer heat to fuelmix under compression period before ignition starts

In fact the speed of gas are more higher than speed of hurricane!!!

How can it be possible the speed of gas are more higher than speed of hurricane?

Let us take the engine with bore at 18 mm and 16 mm stroke, also a .25 size engine and we are selecting the carburator with 5 mm diameter venturi to run the engine as diesel engine since we need more gas velocity to improve fuel atomizing cause the dieselfuel has higher viscosity than methanol/nitro for glowplug engine. The engine are running at 15000 rpm.
The result will show here:

1. Calculate piston speed in meter/second: 2 x 0.016 metre x 15000 rpm : 60 seconds = 8 meter/second

2. Calculate piston area and venturi area: Piston: 0,785 x 18mm x 18mm = 254,34 mm2, Venturi area: 0,785 x 5 mm x 5 mm = 19,625 mm2

3. Calculate speed of gas in meter/second: 8 meter/second x (254,34 mm2 : 19,625 mm2) = 103,68 meter/second (373,24 km/hour / 231.92 Miles/hour)

Also speed of gas are faster than speed of hurricane: 373,24 km/hour / 231.92 Miles/hour...

How big are vacuum inside in the engine under induction period.
1. Calculate vacuum in bar: (8 meter/second : 4) x (8 meter/second : 4) = 0,4 bar vacuum

There are enough vacuum to suck fuel from fueltank and make air more cold.

Formula from: Formeln für technische berechnungen by J. Phyl, 1980.