What quantity of gasoline is shot into a cylinder for each stroke?

Question

I already know PV=nRT, and how to calculate the gas ratios, stoichiometry of the moles of liquid --> gas, the increase in air pressure, and the (pie)(r)^2 Area of the piston. How much gasoline is squirted into each cylinder/stroke ???

to the question asking bore size, ... assume a 2.0L engine/4cylinders=0.5L/cylinder. [assume r=1inch, then pie(r)^2=3.14in of A per piston. from a chem standpoint, 0.5L/22.42L/mol = .0223mol, and since oxygen is 21% of atmosphere, then 0.0223(.21)=4.68x10^-3 mol oxygen/cylinder. multiply this by mol fraction of 1/16 octane/oxygen yields 2.93x10^-4mol octane, which is aprx. 0.3mL per stroke at full bore. at 1000rpm, this is 300mL per minute, and 18L per hour (4.7gallons/hr). anyone dispute or have a better calculation, or a suggestion?

now, I just need to factor in enthalpy (heat produced by combustion), and the increase in pressure from stoichiometry and PV=nRT as function of heat increase, and i will have the Force of the stroke. (over the Area of the piston, of course). I did this in the past, and I recall about 110pounds per stroke under full throttle ... it's been years, though since I calculated that. Remember, the engine is at 1000-6000rpm.

Answer 1

You could try a brute force method to come up with a close approximation. Drive to a gas station and fill up until the gas pump cuts off. Rev your engine for ten minutes at a steady rate. Multiply the RPMs by 10 (minutes) then by the number of cylinders in your car, this will give you an approximate number of strokes.. Fill 'er up again til the pump cuts off. divide the amount of gas you used by the number of strokes...

For greater accuracy...
repeat the experiment many times, consider discarding results that deviate too much from the mean or average result.

Answer 2

I am not trying to be annoying here, but it depends on what engine, and what application. I work in the diesel industry and those ratios are not even specific between manufacturers. It depends on the engine, typically automobiles are referred to as gasoline and diesel is referred to as fuel. Now you also have the different types of fuel, fuel additives, engine modifications, such as turbos, sensors which also determine the amount of fuel as well as the air to fuel ratios. We frequently get calls regarding a specific question and application and we can refer the person to the correct resource. Example - I work with Detroit Diesel engines and depending on the application I could send to to R&D for the new 2010 engines in development, or to a different department for a Series 60 engine. If you can be more specific as to application, I may be able to assist you.

Answer 3

there is only limit to max gasoline that can be injected as suggeted by you.. actual injection of gasoline varies with rpm of the engine.. ie how much you push the accelerator correspondingly fuel is injected..

Answer 4

What is the bore size or CC of the engine?