- Aug 4, 2013
You have been agreeing with my original assumption of fuel vaporization. I was looking for possible answers other than fuel vaporization, if any, that I have overlooked. The engine would probably start on first pull every time if I would squirt a little fuel into the carburetor throat first. I am not planning on doing this ever with this mower. I have a larger Chinese made, Honda copycat, engine on my tiller that for now for whatever reason loves to be fed fuel directly before starting and the manual choke appears to be still working as it should since I have to fully open the choke fairly soon after the engine starts. Maybe the carburetor needs cleaning. The tiller only gets started once in the spring and once in the fall so for now I do not care to pursue it. Thank you for your input.Only gases can burn
Thus the contents of the cylinder can not go bang unless the fuel droplets created in the carburettor venturi have undergone a phase transformation to turn into gasses.
I don't really know what else you could be needing to know.
The longer wait times allows more heat from the engine to be transferred into the fuel\Do you want R values and 4th order quadratic equations .
I have no idea what the latient heat of vapourisation for fuel is as I have no idea exactly what is in it.
Neither Benzene nor Tollunene can vapourise at under 15 C and then the rate it will depend upon the rate head can be adsorbed and the partial pressure of the vapours and the equilibirum value between the gas & liquid state at cylinder compression.
Then it has to be adjusted to account for the film strength of the droplets and any surface tension modifiers present