![]() However, the engine's length demanded the use of a long engine compartment, making the basic design unacceptable in modern vehicles. The smooth running characteristics of the straight-eight made it popular in luxury and racing cars of the past. Also, due to the even number of power strokes per revolution, a straight-eight does not produce unpleasant odd-order harmonic vibration in the vehicle's driveline at low engine speeds. Without such damping, fatigue cracking near the rear main bearing journal may occur, leading to engine failure.Īlthough an inline six-cylinder engine can also be timed for inherent primary and secondary balance, a straight-eight develops more power strokes per revolution and, as a result, will run more smoothly under load than an inline six. ![]() However, crankshaft torsional vibration, present to some degree in all engines, is sufficient to require the use of a harmonic damper at the accessory end of the crankshaft. The type has been produced in side-valve, IOE, overhead-valve, sleeve-valve, and overhead-cam configurations.Ī straight-eight can be timed for inherent primary and secondary balance, with no unbalanced primary or secondary forces or moments. The straight-eight engine or inline-eight engine (often abbreviated as I8 or L8) is an eight-cylinder internal combustion engine with all eight cylinders mounted in a straight line along the crankcase. JSTOR ( July 2009) ( Learn how and when to remove this template message)ĭelage straight-eight racing engine Straight-eight engine with firing order 1-4-7-3-8-5-2-6.Unsourced material may be challenged and removed.įind sources: "Straight-eight engine" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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