Straight-six engine — Wikipedia, the free encyclopedia

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Honda RC166 250

Straight-six engine

A BMW M20B25 with the cylinder head showing the pistons in the six cylinders of the

The straight-six engine or inline-six (often abbreviated I6 or L6 ) is an internal engine with the cylinders in a straight line along the with all the pistons driving a crankshaft (straight engine ).

Displacement range [ edit ]

In the straight-six design is used for displacements ranging from 2 to 5 litres (120 to 310cuin ). [ 2 ] It is sometimes used for smaller but these, although very running, tend to be rather to manufacture in terms of cost-to-power Since the length of an engine is proportional to the number of cylinders in one the straight-six is necessarily longer alternative layouts such as L4, V4, V6, or V8.

The smallest production straight-six was in the Benelli 750 Sei motorcycle, displacing (45.63cuin) (0.7477L). [ citation ] Honda and Mike Hailwood in the 1960s with the RC166 (15cuin) (0.25L) six-cylinder, motorcycle engine. Pre-World War II could be quite large by standards — such as the Rolls Silver Ghost ‘s engine and the 824cuin (13.5L) of the Peerless. Pierce. and Fageol .

The Six and Gipsy Queen. made by the de Engine Company from until 1950, were straight-six engines displacing cubic inches (9.187L). were used in a variety of including the de Havilland Dragon and the Cierva W.9 experimental helicopter.

Because it is a fully balanced the straight-six can be scaled up to very sizes for heavy truck, and marine use, such as the 16L Volvo diesel engine and the 15L ISX used in heavy vehicles. [ 4 ] The are used to power ships. and use oil. The straight-six can also be as a scalable modular component of motors which stack straight-sixes together, e.g. or V-12s, W-18s, etc.

trends [ edit ]

Straight-six engines were much earlier than V6 While the first straight-six was in 1903 by Spyker. it was not until that a production V6 was introduced. [ 5 ] V6s crossplane V8 engines ) had intrinsic problems not present in the straight-six.

Honda RC166 250

The of the straight-six was not a major concern in the front-engine/rear-wheel drive vehicles, but the move to the more space-efficient drive and transverse engine versus front-to-back) configurations in cars made the length of the V6 half the length of an L6 with the bore size, plus the of one rod) a major advantage. As a in recent decades automobile have replaced most of straight-six engines (and of their V8s) with V6 Nissan have replaced earlier turbocharged inline-6 with larger-displacement naturally V6 engines while maintaining the FR and Mercedes-Benz now uses V6 engines, also retaining the FR layout. [ 6 ] straight-six engines are also replaced by turbocharged in-line cylinder engines (e.g. in the BMW range), which offer the power output with better fuel efficiency, due to displacements and lower friction the reduced number of cylinders. The secondary harmonic balance of engines is largely addressed the use of balance shafts although it can match the

in-line six.

Cars [ edit ]

Exceptions to the to V engines include BMW. specializes in high-performance straight-sixes in a lineup of front-engine/rear-wheel-drive vehicles, which designed a compact engine/transmission package to fit transversely in its cars, and the Australian Ford which still uses a configuration.

Trucks [ edit ]

continue to be used in medium to trucks. Ford is one notable using a V8 in medium duty Ram pickup trucks still the straight-six. GM pickup trucks the straight-six in the 80’s, Ford the straight-six in the 90’s.

In 2002, Motors introduced the Vortec as part of the modular straight-four, and straight-six GM Atlas engine It was used in their small utility vehicles. Jeep the straight-six in 2006 with the Jeep Wrangler being the vehicle.

Honda RC166 250
Honda RC166 250
Honda RC166 250
Honda RC166 250

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