cylinder scavenging

Glossary “cylinder scavenging” Definition:
The process by which spent exhaust gases are removed from the cylinder prior to the arrival of fresh air and fuel. The momentum generated as the exhaust gases exit the combustion chamber are used to help draw the A/F mixture into the cylinder for only a few degrees of cankshaft rotation. This is important because left over exhaust in the combustion chamber can rob the engine of power.

cylinder leakage testing

Glossary “cylinder leakage testing” Definition:
Using compressed air applied to the cylinder through the spark plug hole while the piston is at TDC of the compression stroke. This test detects the percentage of leakage and helps to location the possible source of the leak.

cylinder numbering

Glossary “cylinder numbering” Definition:
The order in which the cylinders are numbered; cylinder one may be on either front side of a V engine, or starting with one at the front of most in-line engines.

cylinder head gasket

Glossary “cylinder head gasket” Definition:
Gasket (usually) metal and other materials that is used to seal the mating surfaces between the engine block and the cylinder head. It must be able seal the combustion chamber, allow coolant and oil to pass through enroute to other engine components.