. Canadian machinery and metalworking (January-June 1919). deadcentre. Similarly in the case of the Mono-sonoape engine, the exhaust valve ismade much heavier than mechanica1strength demands of it, purely to count- Order of Firing The different ordersof firing which prevailhave a marked effectfrom a balance point ofview on the varioustypes of engines. Theorder of firing on an8-cylinder vee type en-gine, say, is examination it willbe seen that the cylin-ders are firing with aninterval of time equiv-lent to a quarter of a revolution, there-fore taking two successive cylinders, theimp
. Canadian machinery and metalworking (January-June 1919). deadcentre. Similarly in the case of the Mono-sonoape engine, the exhaust valve ismade much heavier than mechanica1strength demands of it, purely to count- Order of Firing The different ordersof firing which prevailhave a marked effectfrom a balance point ofview on the varioustypes of engines. Theorder of firing on an8-cylinder vee type en-gine, say, is examination it willbe seen that the cylin-ders are firing with aninterval of time equiv-lent to a quarter of a revolution, there-fore taking two successive cylinders, theimpulses on crankcases from explosionsoccur almost simultaneously. A similarcondition exists over the remaining sixcylinders, giving a common point of intersection over the complete order offiring. This common point of intersec-tion of the different impulses is ap-proximately over the centre of gravityof the engine. By having the force of ex-plosion localized at the centre of gravity,a minimum vibration is produced. Thisorder of firing gives a maximum bal-. PcAh Traced bu Cylinders FIG. 1—DIAGRAM ILLUSTRATING THE WORKING PRINCIPLES OF A ROTARY ENGINE. ance with a minimum of vibration. Incontrast with the preceding exampletake an engine of exactly similar type,but with a wholly different order of fir-ing, say 12347856, and with the cylindersnumbered as shown on the sketch. Whenthis engine is running, there is a ten- dency to rock longitudinally in the plane,that is, there is a very great chance ofan acute vibration being present. All rotary engines fire in one specificorder, the cylinders being caused to firealternately, a seven cylinder engine fir-ing in the order 1, 3, 5, 7, 2, 4, 6. Plainly,it would be impossible to fire these cylin-ders consecutively, or to have an evennumber, instead of always an odd num-ber of cylinders. If the question wereasked, What is the order of firing of arotary engine, and why? the answerwould be that the order of firing is 1,3, 5, 7, 2, 4, 6 to con
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
