Glossary

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Viscosity
Refers to the ability of a liquid to flow. An oil with high viscosity is very thick and flows slowly; an oil with low viscosity flows easily.

Valve Bounce
It indicates a condition where the valve is not held tightly closed in the seat even though the camshaft has not opened it. Also called "flutter."

Valve Lash
Total clearance in the valve operating train with cam follower on camshaft base circle.

Variable Valve Timing
Through the use of computers, the precise time when the valves open and close can be altered. It may be better to change the timing slightly when the engine is at a higher RPM than when it is slower.