Firing order, Other Engineering

FIRING ORDER

If in multi cylinder engines, various cylinders are made to fire one after the other, interference between adjacent cylinders would occur, since these may have overlapping periods which prevents proper distributions of the fresh charge in the inlet manifold. Likewise, overlapping of the exhaust periods in case of adjacent or nearby cylinders would increase exhaust back-pressure which may prevent the combustion products escaping from the cylinders. Therefore, to obtain best engine performance in multi cylinder engines, the occurring of power strokes in various cylinders is not kept directly one after the other. For example, in 4-cylinder engines it is not kept as 1-2-3-4, but is provided as 1-3-4-2 or 1-4-3-2. Similarly firing order of a 6-cylinder in line engine is 1-5-3-6-2-4 and in a V-8 engine it is 1-5-4-2-6-3-7-8 (where in cylinder nos. 1 and 5 are the front ones). Proper firing order also helps in suppressing certain critical torsion vibrations.

The occurrence of various events in the 4-cylinder engine having firing order as 1-3-4-2 is shown below:

Crank shaft degrees

cylinder

Cylinder

cylinder

cylinder

0

1

2

3

4

180

Power stroke

Exhaust

compression

Suction

360

exhaust

Suction

Power stroke

Compression

540

Suction

compression

exhaust

Power stroke

 The driver must know the correct firing order of the engine so that he is able to connect the H.T. wires correctly to various spark plugs.

 

 

Posted Date: 7/21/2012 8:49:08 AM | Location : United States







Related Discussions:- Firing order, Assignment Help, Ask Question on Firing order, Get Answer, Expert's Help, Firing order Discussions

Write discussion on Firing order
Your posts are moderated
Related Questions
career aspiration as a determinant to senior secondary school students performance in Technical drawing.

I need help About the project I sent and it is the third time I am sending so please I really want help

Logic gates - and gate: Figure shows the symbol that represents 2 input AND gate together with its truth table. This gate will only adopt a 1 state at its output terminal when

write drawback of linear array

ENHANCEMENT MODE MOSFET In the enhancement-mode type, the gate must be forward biased to produce charge carriers in the channel. These devices are normally of and do not condu

Commercial buildings - fire protection engineering: The term 'commercial buildings' refers to any buildings that are not residential buildings and that do not fall under the m

what are clippers

Introduction Engineering Economic Analysis Definition: using a combination of quantitative and qualitative techniques to analyze economic differences among engineering design a

find IDFT of the sequence X(k)={5,0,1,-j,0,1,0,1,j,0}

IGNITION SYSTEMS The outline of a high energy ignition system is illustrated in the figure. Each high energy ignition unit has a low voltage supply which is controlled by the