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Talk:Straight-twin engine

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Terminology

(This post kind-of follows the "Parallel Twin" post above).

I think the paragraph (in italics, below), from the Terminology section is wrong. There is no difference between a parallel twin and a vertical twin. It is NOT a question of their crankshaft angles. One simply describes an engine as a 360°,180°, 270° parallel-twin (or vertical twin).

"In the United Kingdom, the term "parallel-twin" is traditionally used for engines with a crankshaft angle of 360 degrees, since the two pistons are in the same direction (i.e. parallel to each other). "Vertical-twin" was used to describe engines with a crankshaft angle of 180 degrees, which causes the pistons to travel in opposite directions. The terms "straight-twin" and "inline-twin" were used more generically for any crankshaft angle." Arrivisto (talk) 12:46, 19 May 2023 (UTC)

Arrivisto (talk) 12:46, 19 May 2023 (UTC)

Ferrari I-2

Ferrari’s Aurelio Lampredi designed a 2.5 litre inline two-cylinder engine for the mid-1950s Formula One regulations, ostensibly because it would have more torque for slow and twisty circuits like Monaco. Apparently it broke on the test rig and was never actually run in a car. The Hans Tanner/Doug Nye history of Ferrari has more details but it’s at home and I'm not. Mr Larrington (talk) 15:21, 25 December 2024 (UTC)

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