KostasVolos
ArboristSite Operative
Does the following stand true,
at least from a theoretical point of view ?
Yesterday ,during a conversation
someone claimed that :
" The fuel mix ( gasoline & 2T oil ) has rather the form of an aerosol
( tiny droplets of a liquid suspended in a gas medium ) when it leaves the carburetor and enters the intake port ,into the lower part of an 2 stroke small engine.
At the lower part of the engine the fuel contacts the hot surfaces of the crankshaft ,connecting rod ,bearings and the underside of the piston .While absorbing heat
( energy ) the gasoline boils and
changes state from tiny liquid droplets into gas.The oil absorbs heat also ,but due to higher flash and boiling points will not enter the gas state and remain in liquid form .Thus as the piston moves towards BDC the gasoline in gas state mixed with air will pass through the transfer port into the combustion chamber ,where they will be ignited.
The oil remaining at the lower part of the engine will lubricate the main bearings and the bearings of the connecting rod .It will also lubricate the piston skirt and help
the sealing job of the piston ring(s). There's only a small percentage of oil entering the combustion chamber.Most of it
stays on the lower part of engine.
Gasoline cools the lower part of engine ,while being the actual fuel in the combustion chamber ,on the other hand the oil cools and lubricates the lower part of the engine.If excessive amount of oil enters for some reason the top part of the engine ( combustion chamber ) and gets burned along with the gasoline/air mix it will cause only trouble ,like a fouled spark plug and carbon deposits at the ring(s) groove(s) ,piston crown ,exhaust port and muffler."
at least from a theoretical point of view ?
Yesterday ,during a conversation
someone claimed that :
" The fuel mix ( gasoline & 2T oil ) has rather the form of an aerosol
( tiny droplets of a liquid suspended in a gas medium ) when it leaves the carburetor and enters the intake port ,into the lower part of an 2 stroke small engine.
At the lower part of the engine the fuel contacts the hot surfaces of the crankshaft ,connecting rod ,bearings and the underside of the piston .While absorbing heat
( energy ) the gasoline boils and
changes state from tiny liquid droplets into gas.The oil absorbs heat also ,but due to higher flash and boiling points will not enter the gas state and remain in liquid form .Thus as the piston moves towards BDC the gasoline in gas state mixed with air will pass through the transfer port into the combustion chamber ,where they will be ignited.
The oil remaining at the lower part of the engine will lubricate the main bearings and the bearings of the connecting rod .It will also lubricate the piston skirt and help
the sealing job of the piston ring(s). There's only a small percentage of oil entering the combustion chamber.Most of it
stays on the lower part of engine.
Gasoline cools the lower part of engine ,while being the actual fuel in the combustion chamber ,on the other hand the oil cools and lubricates the lower part of the engine.If excessive amount of oil enters for some reason the top part of the engine ( combustion chamber ) and gets burned along with the gasoline/air mix it will cause only trouble ,like a fouled spark plug and carbon deposits at the ring(s) groove(s) ,piston crown ,exhaust port and muffler."