31
Vintage, PVT & 2 Litre Forum / Re: 1925 AC Six for sale (restoration required)
« on: September 28, 2022, 10:33:32 »
16/XX refers to the engine that was fitted.
The AC Six was a "16 HP" engine according to the RAC taxation class:
https://en.wikipedia.org/wiki/Tax_horsepower
16 HP had no relevance to the engine's real output, so AC and many other manufacturers used designations such as 16/66, 16/70, 16/80 etc.
16/66 = 16HP taxation class, 66 HP output at the flywheel (these numbers were sometimes optimistic!)
16/80 = 16HP taxation class, 80 HP output at the flywheel
The Anzani/Cubitt/AC 4 cylinder was in the 12 HP taxation class.
The AC Six was a "16 HP" engine according to the RAC taxation class:
https://en.wikipedia.org/wiki/Tax_horsepower
16 HP had no relevance to the engine's real output, so AC and many other manufacturers used designations such as 16/66, 16/70, 16/80 etc.
16/66 = 16HP taxation class, 66 HP output at the flywheel (these numbers were sometimes optimistic!)
16/80 = 16HP taxation class, 80 HP output at the flywheel
The Anzani/Cubitt/AC 4 cylinder was in the 12 HP taxation class.