Terminology

A comparison between total cylinder volume and clearance volume ( the space left in the cylinder when the piston is at TDC )

• down speeding

• compression-ignition

• compression ration

• thermal efficiency

A combustion mechanism that ignites fuel by using the heat derived from compressing air as an ignition source.

• SI spark-Ignition

• Spark plugs

• CI Compression-ignition

• CI Compression-intake

The immediate care given to an injured or suddenly ill person.

• Hazard

• First aid

• Respirator

• Shock

Flat metal strips used to measure the width of gaps, such as the clearance between valves and rocker arms.

• Tape measure

• Dial caliper

• Feeler gauges

• Micrometer

The highest point the piston travels in a cylinder.

• Bottom Dead Center

• Top Dead Center

• Compression Ratio

• Cylinder Volume

The coarseness or fineness of a thread as measured by the distance from the peak of one thread to the next, in threads per inch.

• Diameter

• Thread Pitch

• Length

• Shank

The twisting force applied to a shaft that may or may not result in motion.

• Torque angle

• Torque to Yield

• Torque

• Yield Force

Torque method that involves an initial torque followed by turning an additional amount of degrees.

• Torque Mechanism

• Torque to Yield

• Torque Turn

• Torque

Largest structure of an engine , which encloses the cylinders and provides a rigid frame to support the cylinders or cylinder liners.

• Cylinder Head

• Crankshaft

• Engine Block

• Camshaft

The leakage of air past the piston rings into the crankcase.

• Crevice volume

• Opacity

• Blow-by

• Compression