Glossary “closed end spring” Definition:
Coil springs having end hoops next to the coils.

Glossary “closed loop” Definition:
1). The basic principle of electronic engine management in which input from an O? sensor allows the engine-control computer to determine and maintain a nearly perfect A/F ratio. 2). A computer condition in which the A/F ratio is being controlled on the basis of various inputs to the computer.

Glossary “closed loop fuel control” Definition:
Controls engine operation when the engine is operating in closed loop fuel control.

Glossary “closed ventilation system” Definition:
Crankcase ventilation system that does not allow blowby to escape into the atmosphere.

Glossary “closed coat” Definition:
Type of grid on sandpaper and discs, the resin completely covers the grit. This bonds the grit to the paper or disc more securely.

Glossary “closed camber head” Definition:
Cylinder head having a combustion chamber with a very large quench or squish area.

Glossary “closed circuit” Definition:
Circuit that is complete from the power source to the load and back to the ground side of the power source. Current flow is equal throughout the circuit, so the conductors have sufficient capacity at any point in the circuit.