The Prototype Engine

See also:

• The Prototype Engine made its first run (new 10.12.2003)
• The Prototype Engine Valve Train Testing (updated 6.10.2003)

The prototype engine is based on a single cylinder industrial engine. To change the engine cycle to Z cycle, the cylinder head with valve train has been changed. The cylinder and lower parts of the engine are from the original industrial engine. For the test drive, it is planned to use an external compressor to produce the compressed air needed for the engine.

The cylinder is air-cooled. It is possible to modify the cylinder to use water-cooling. The cylinder head made by Aumet is water-cooled.

The prototype engine is now (10.11.2003) ready for the first run. See images below. Click the images for larger view.

	(44 kB) The prototype engine ready to run. The engine is complete, but the auxiliary systems (the cylinder head cooling and lubrication) are not connected.
	(36 kB) The prototype engine ready to run. The intake duct is behind the timing belt. The intake is going to be connected to the compressed air source through the air temperature control unit.
	(43 kB) The prototype engine ready to run.

Photos of the dismantled engine:

	(93 kB) The prototype engine with cylinder head. The original industrial engines timing gear cover is dismantled from the engine in the picture. The triangular shape object in the cylinder head is the exhaust rocker arm. The valves and the inlet rocker arms are not mounted in the picture.
	(180 kB) Side view of the prototype engine.
	(212 kB) The prototype engine. The original unit pump is mounted in this picture. The shaft in the original timing gear cover is the unit pump camshaft. The unit pump camshaft has been modified for 2-stroke operation. The shaft is also modified to allow adjustable timing of injection. The unit pump can be used in the first test drives if common rail injection system is not used.
	(35 kB) The piston of the prototype engine. The combustion chamber is designed for Z combustion. The combustion chamber is attached to the piston crown by threads. The lip of the combustion chamber is made of copper.

Some 3d-pictures of the prototype engine cylinder head:

	The cylinder head, side view.
	The cylinder head, bottom view.
	The exhaust valve train.
	The intake valve train. The intake valve springs are pneumatic.
	The complete valve train.