https://www.enginela...cylinder-engine
The AGCO Power 98HD inline-seven-cylinder diesel engine is designed for power generation applications. Photo Credit: AGCO Power
...According to Fernie and every other paper on the matter we came across, a straight-seven’s firing order would be all odd pots first, followed by the even cylinders. So a 1, 3, 5, 7, 2, 4, 6 sequence. It may sound strange, but this frenzied firing order would be somewhat subdued by the sheer volume of cylinders firing. The 720-degree four-stroke cycle within this engine configuration does benefit from having more pistons firing, which as we know, uneven firing orders can be slightly smoothed by adding additional pistons to the mix. Hence an inline-five is far smoother than my Daihatsu’s crappy little sewing machine of a three-banger.
