The combustion cylinders operate on a four stroke cycle and the heat recovery steam cylinders operate on a two stroke cycle.

There are two downward piston strokes in each four stroke cycle.

This sequence provides a four stroke cycle and one power impulse every revolution of the crankshaft (121).

A four stroke engine (12) is disclosed which comprises an odd number of cylinders and is controlled by a controller (14) which derives the compression points of the cylinders within the four stroke cycle.

A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle.

In four-stroke cycle engine, the piston pushes the burnt gases to exhaust manifold during its exhaust stroke.

The four-stroke cycle (or Otto cycle) of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc).

French engineer Alphonse Beau de Rochas, patents the four-stroke cycle used in most modern internal combustion engines.

The engine of this invention exhibits performance characteristics associated with the usual four-stroke cycle engines.

The exhaust valve (16) is opened for a first period during a four-stroke cycle to allow combusted gases to be expelled from the combustion chamber (12).

A powerful electric motor connected directly to the battery is used to rotate the crankshaft at a speed high enough to initiate the four-stroke cycle and start the engine.

However, weight issues are more important in a four-stroke cycle so you have to pay attention to what�s in the boat and where.

However, weight issues are more important in a four-stroke cycle so you have to pay attention to whats in the boat and where.

Mechanical Operation A rotary engine uses a triangular-shaped rotor to divide the space inside the engine, enabling a standard four-stroke cycle of intake, compression, ignition and exhaust.

The technology we’ve mentioned so far is all to do with managing the four-stroke cycle, but there are many more ways in which modern engines save energy.