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The Valveless was an English
The Valveless was an English automobile
A car or automobile is a motor vehicle with Wheel, wheels. Most definitions of ''cars'' say that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, pe ...
manufactured, after lengthy development, from 1908 until 1915 in Huddersfield, Yorkshire. The successor to the Ralph Lucas Valveless, the car marked the entry of the David Brown & Sons group into the manufacture of motors. Its engine
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.
Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power gen ...
was a 20 or 25 hp duplex two-stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a Thermodynamic power cycle, power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being comple ...
model which was advertised as having "only six working parts"; these included two piston
A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tig ...
s, two connecting rod
A connecting rod, also called a 'con rod', is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the cranksh ...
s, and two crankshaft
A crankshaft is a mechanical component used in a piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating shaft containing one or more crankpins, that are driven by the pistons via the connecting ...
s, which were geared together and counter-rotated. This is a type of engine configuration known as a split single since it is effectively a single cylinder split into two.
Models
* 1908 20 hp 2-cylinder 133 x 140 = 3.891 litres * 1909-1911 25 hp 2-cylinder 133 x 140 = 3.891 litres * 1911-1915 15 hp 2-cylinder 112 x 127 = 2.503 litres * 1913 15 hp 2-cylinder 118 x 127 = 2.503 litres * 1913-1914 19.9 hp 2-cylinder 127 x 127 = 3.217 litres * 1915 19.9 hp 2-cylinder 127 x 133 = 3.546 litres :The cars with smaller engines had slightly shorter wheelbases and so were lighter.See also
*List of car manufacturers of the United Kingdom
:''This list is incomplete. You can help by adding correctly sourced information about other manufacturers.''
As of 2018 there are approximately 35 active British car manufacturers and over 500 defunct British car manufacturers. This page lists ...
References
* David Burgess Wise, ''The New Illustrated Encyclopedia of Automobiles''.External links
Defunct motor vehicle manufacturers of England Defunct companies based in Yorkshire Vehicle manufacturing companies established in 1908 Vehicle manufacturing companies disestablished in 1915 1908 establishments in England 1915 disestablishments in England British companies disestablished in 1915 British companies established in 1908 {{Brass-auto-stub