12 cylinder engine how many cylinders are ignited at the same time?

In the 12 cylinder engine, the crankshaft rotates twice, and each cylinder completes a working cycle of "intake, compression, power and exhaust", that is, one cylinder works every 60 degrees of crankshaft angle. There is no problem of simultaneous ignition.

Take 12V 135 diesel engine as an example, and the working sequence is1-15-8-3-10-6-7-2-1.

Cylinder arrangement order (see tank end)

On the left is1-2-3-4-5-6; On the right is 7-8-9-10-11-12.