Valve

Engine valve acts as the gatekeeper for air to move in and out of the combustion chamber in a motorcycle engine. There are two types of engine valves: intake valve and exhaust valve. Both types of engine valves are located in the cylinder head. Each valve consists of a stem and a head. Its primary function is to allow air flow smoothly from the cylinder to ignite the fuel which will drive the pistons up and down.

To let air flow in, the intake valve will open. Then, it will be closed to build compression in the cylinder. This situation will drive the piston to move up. When the piston is in full up position, the exhaust valve will open to relieve pressure and allow the hot air to exhaust out. The more air moving in and out of the engine, the more efficient the engine power will be generated. This is why the engine valve plays a critical role in an engine performance.

The effectiveness of engine valves is affected by the mass and stiffness factors. By decreasing the valve mass, the operating engine speed is enhanced. In bike racing, the less mass means greater speed. Therefore, Uma Racing has produced lightweight racing valves for the purpose of increasing the engine speed. This high performance products are designed in single piece forged valve as well as pieced together valves for your choice.

Superior grade alloy steel is the predominant material in the production of Uma Racing intake valve and exhaust valve. With high quality material, Uma Racing engine valves are known for its durability, light weight and high wear resistance. Besides, Uma Racing also provides the Titanium valve stem base for the racing applications. This product is proven to be lighter and stronger than the OEM product.