What are the advantages of using sleeve valves?
The main advantages of the sleeve-valve engine are:
- High volumetric efficiency due to very large port openings.
- The size of the ports can be readily controlled.
- Good exhaust scavenging and controllable swirl of the inlet air/fuel mixture in single-sleeve designs.
How sleeve valve engines work?
A sleeve valve, on the other hand, uses a sliding, sometimes rotating sleeve to control how much air and fuel get detonated with each compression stroke. The basic premise of igniting fuel and air to drive a set of pistons and turn a crankshaft is the same as it is with other internal-combustion engines.
Who invented the sleeve valve engine?
These were Peter Burt, [6] a Scottish inventor, and James McCollum, [7] from Canada. They independently invented the mono- or single-sleeve valve mechanism, which as a result of the combination of their individual design characteristics came to become known as the Burt–McCollum sleeve valve.
What is a rotary valve engine?
A rotary valve is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. The common stopcock is the simplest form of rotary valve. Most hydraulic automotive power steering control valves.
Why are sleeved cylinders used?
The primary reason for sleeving an engine to either repair a cylinder bore or protect it from damage in the first place. Sleeves can also be used to restore a particular bore size if a cylinder has to be “bored out” to repair a cracked or otherwise damaged engine. Simply put, a dry sleeve does not contact the coolant.
What is a wet sleeve engine?
Wet sleeves (or liners) have engine coolant directly in contact with their outer surface and various methods are used to contain coolant properly within the engine. Dry liners, as the name implies, are pushed into the bore of a block (the Yanmar 6LY 315 & 350 are examples) and have no contact with the engine coolant.
Do rotary engines have valves?
A rotary engine doesn’t have intake or exhaust valves, like a two-stroke piston engine and it also has to have oil injected with the gasoline to lubricate and seal the rotors against the rotor housing just as a two-stroke has to have its oil and fuel mixed.
Do engine valves spin?
Yes, the valves do rotate under normal operation albeit slowly. Some valves have rotate mechanisms to ensure they rotate at a predictable rate. The rotation action helps keep the valve and seat clear of debris to ensure good sealing.
Why are cylinder sleeves used?
Who are the manufacturers of sleeve valve engines?
The Silent Knight was a hit, and soon other manufacturers wanted in on the sleeve valve action — including automakers in the United States. Willys cars and light trucks, Daimler, and Mercedes-Benz, among others, employed the Knight sleeve-valve engine [source: Wells].
What kind of valve is a sleeve valve?
For the sleeve valve used in water applications, see Sleeve valve (water). For cylinder lining, see Cylinder (engine) § Cylinder sleeving. Sleeve valve closeup from a Bristol Centaurus Mark 175. The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve.
What did sleeve valve engines do in World War 2?
The sleeve-valve engine, which has been used on both automobiles and airplanes, powered speedy British fighters such as the Hawker Typhoon and Hawker Tempest. With their brute horsepower, they helped the Allies control the skies, provide air support for ground forces and eventually win the war.
How does combustion stroke work in sleeve valve engine?
Combustion stroke: ignition forces the piston back down into the cylinder; as the piston goes to bottom-dead-center, the liner (or sleeve) shifts to align its cutout openings with the cylinder’s exhaust ports