Engine in Numbers

[1 bar = 510Pa (N/m2) = 0.1 MPa (N/mm2)]

Gasoline
Engine Engine Rotation Speed ​​6000 RPM
Engine Specifications:

• Stroke Length (S): 83.6 mm
• Cylinder diameter (B): 80 mm
•  Crank arm length (RR): 132.9 mm

 
* Number of crankshaft revolutions per second at 6000 revolutions / minute = 6000 ÷ 60 = 100 revolutions / second
Number of piston strokes in the cylinder per second = 100 x 2 = 200 strokes per second
Number of fire inside the piston per second (four-stroke engine) = 200 ÷ 4 = 50 fires per second The
piston moves up and down 200 times in the cylinder in one second
 
* Average piston speed at 6000 rpm:
Average piston speed = Stroke length x Number of revolutions per second x 2 strokes / revolution
                  = 83.6/ 1000 x 6000 / 60 x 2 = 16.72 m/s x 3.6 = 60.2 km/h
* Maximum piston speed: Approx. 1.6 Average piston speed = 16.72 x 1.6 = 26.75 m/s
                                                                         = 60.2 x 1.6 = 96.3 km/h.

The maximum piston speed is up to 100 km / h inside the cylinder
 
* The maximum piston wheel at a rotational speed of 6000 rpm
The piston wheel is within 22000 m/s2 or 22000 ÷ 9.81 = 2242.6 times the gravitational acceleration The
piston is subjected to a force of attraction equal to 2,000 times the gravitational acceleration (g) At the start of the downward movement

 
* Maximum tension on the connecting rod at a rotational speed of 6000 rpm (piston inertia force)
where the maximum acceleration is 22000 m/s2, occurs during the piston descending at the highest point of the piston movement inside the cylinder (upper dead point).
 Assuming that the mass of the piston and one third of the connecting rod = 1 kg
, the inertial force of a mass of 1 kg = K * C = 1 x 22000 = 22000 Newtons
 22000 ÷ 9.81 = 2242.6 kg = 2.24 tons  
The tension force required to move a 1 kg piston down at the dead point The upper
 
limit is up to 2.24 tons * the maximum pressure on the connecting rod at a rotational speed of 6000 rpm,
as the maximum pressure of the fire entering the cylinder of a gasoline engine is in the range of 40-60 bar, and it occurs during the power stroke while the piston is descending and occurs at about 10o after the dead point Supreme.
And the surface area of ​​the piston = t/4 s2 = 3.14/4 x (83.6) 2 = 5489.17 mm2
Maximum pressure = 60 bar x 0.1 = 6 MPa (Newtons/mm2)
Force on the piston surface = 5489.17 x 6 = 32934.7 Newtons
s = Jk (A Newton = 9.81 kilometer/s2)
Force (pressure) on the piston surface = 32934.7 ÷ 9.81 = 3357.26 kg = 3.36 tons The
piston is subjected to a pressure force during the power stroke as a result of the expansion of air inside the cylinder up to 3.5 tons.

 
Engine design:
The piston, piston, connecting rod, crankshaft and crankshaft bearings shall be designed to withstand these loads.
The piston is made of light metals to reduce the piston mass and thus reduce the inertia force
– the maximum combustion pressure of a diesel engine is higher than the maximum pressure of a gasoline engine equal in terms of engine capacity. It requires increasing the dimensions of the piston and connecting rod to overcome these loads, and thus the mass of the piston and connecting rod increases. Increasing the piston mass will therefore increase the inertia force and to overcome this requires making the maximum rotational speed of diesel engines (400-5000 rpm) less than the maximum rotational speed of gasoline engines (6000-8000 rpm) to reduce the inertial force.