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The reciprocating piston petrol engine
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
For in-line four-cylinder engines the first and fourth crankthrows are therefore indexed on one side of the crankshaft and the second and third throws on the other side (Figure 1.26a). The firing order of these engines, numbering from the front, may then be either 1-3-4-2 or 1-2-4-3 at 180° intervals. Similarly, in the case of in-line six-cylinder engines, the crankthrows are spaced in pairs with an angle of 120° between them. Hence, the first and sixth crankthrows are paired, as are the second and fifth, and likewise the third and fourth (Figure 1.26b). The firing order may then be such that no two adjacent cylinders fire in succession; that is, either 1-5-3-6-2-4 or 1-4-2-6-3-5 at, of course, 120° intervals.
Whirling analysis of shaft line with a new compact flexible coupling
Published in C. Guedes Soares, Y. Garbatov, Progress in the Analysis and Design of Marine Structures, 2017
The firing order is the sequence of power delivery of each cylinder in a multi-cylinder reciprocating engine (Okumoto et al. 2008). This is achieved by sparking of the spark plugs in a gasoline engine in the correct order, or by the sequence of fuel injection in a Diesel engine. When the firing order is incorrect or delayed, the engine does not work correctly. In this situation, the engine is operating in an improper way and induces vibrations. For these reasons, for the engine with 16 cylinders, the 0.5th, 1st, 4th engine firing order are taken into account as vibration sources.
Engine systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
At the rear of the main bearing journal, at the back of the engine, a machined face is formed on the crankshaft as a mating surface for a sealing ring. This is the main oil seal at the back of the engine (Fig. 2.77). In addition, there is a machined, threaded flange surface to accommodate mounting of the flywheel. For a four-cylinder engine, the big-end journals are paired and set at 180°. For most four-cylinder engines the firing order is 1, 3, 4, 2.
Numerical analysis of the forces on the components of the V-12 engine type retrofitted in transportation vehicle
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Hoi Xa Nguyen, Nguyen Viet Dung, Khanh Duc, Dung Dinh Nguyen, Vinh Nguyen Duy
From the system of these equations above, we have constraint reaction forces. In this research, depending on the firing order of the test engine: 1 L-6 R-5 L-2 R-3 L-4 R-6 L-1 R-2 L-5 R-4 L-3 R, we have a figure of torque effect on crankpin in a period of crankshaft angle.