How Are Engine Cylinders Numbered

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This engine has the cylinders numbered 1-3-5 on the left-hand bank (front bank for FWD applications) and 2-4-6 on the right-hand bank, the number 1 cylinder being the furthest from the flywheel end. The firing order is 1-6-5-4-3-2.

The numbering convention generally follows a straightforward pattern where cylinders are numbered sequentially from left (driver) to right (passenger) in each row or bank. In an inline six-cylinder engine or V8/V12 with two banks side-by-side, each row has its own sequence starting at one end and ending at the other end.

There may be some confusion out there though. Autozone's repair manuals show 1-2-3-4-5-6, but with the cylinders numbered differently so the actual order of cylinder firing is the same as shown in this thread, so the only question is: do the OBD II codes correspond to the 1-4-2-5-3-6 or 1-2-3-4-5-6.

On the right bank, the cylinders are numbered L1-R1. The v6 engine uses this sequence because the two cylinders can fire simultaneously or sequentially. To determine cylinder numbering, look at the engine block. Generally, v6 engine cylinders are numbered from the front to the back. In vertically mounted v6 engines, the first cylinder is number rRUGnrr. 379 421 409 464 230 403 373 218 498

how are engine cylinders numbered