Straight-seven engine with firing order 1-3-5-7-2-4-6

A straight-seven engine or inline-seven engine is a straight engine with seven cylinders. It is more common in marine applications because these engines are usually based on a modular design, with individual heads per cylinder.

Marine engines

Straight-seven engines produced for marine usage include:

Land use

The AGCO Sisu 98HD is a straight-seven diesel engine that was released in 2008.[5] Intended for farming machinery, the engine shares various components with the company's straight-six engine.[6]


  1. ^ "Wärtsilä RT-flex 82T".
  2. ^ "Wärtsilä 32".
  3. ^ "MAN Diesel Marine Engine IMO Tier I Programme". Archived from the original on 2011-03-10. Retrieved 2011-03-07.
  4. ^ Cummins, C. Lyle Jr. (2007). Diesels for the First Stealth Weapon. Carnot Press. p. 405,464. ISBN 978-0-917308-06-2.
  5. ^ "7-Cylinder - AGCO Sisu Power". Archived from the original on 7 July 2011.
  6. ^ "AGCO SISU POWER launched new innovative 7-cylinder 9,8 litre engine". 10 September 2008. Archived from the original on 4 March 2016.