Glossary “Rankine scale” Definition:
see Rankine
r
RAP
Glossary “RAP” Definition:
Remote Anti-Theft Personality Module, or Retained Accessory Power
Ranco control
Glossary “Ranco control” Definition:
A tradename often used for a type of thermostat.
random access memory (RAM)
Glossary “random access memory (RAM)” Definition:
Computer memory into which the user can enter information and instructions (write), and from which the user can call up data (read).
ramps
Glossary “ramps” Definition:
Transistions between voltage levels of sine waves that change at a constant rate. Also refers to the part of the cam lobe that lifts and closes the valve.
ramp
Glossary “ramp” Definition:
The sloping section of a camshaft lobe which raises the lifter.
ramp angle
Glossary “ramp angle” Definition:
An angle formed by lines adjacent to the static-loaded radius of the front and rear wheels intersecting at the point of the lowest ground clearance under the middle of the vehicle.
ramp type differential
Glossary “ramp type differential” Definition:
A design of a limited-slip differential.
ram air cleaner
Glossary “ram air cleaner” Definition:
An air cleaner for high-performance cars that opens an air scoop on the hood to provide a ram effect when the throttle is wide open.
ram induction
Glossary “ram induction” Definition:
An intake manifold designed to cause a resonant effect at a specific predetermined engine speed.
ram tubes
Glossary “ram tubes” Definition:
Short, tuned, tubular stacks on the top of carburetors.
ram tuning
Glossary “ram tuning” Definition:
Tuning of an intake manifold to ensure that the passages are of sufficient length to cause a resonant effect at a specific predetermined engine speed.
RAM
Glossary “RAM” Definition:
Random Access Memory. A computer read-write memory on which information can be written and from which it may be read from.
ram air
Glossary “ram air” Definition:
Air forced through the radiator and condenser coils by the movement of the vehicle or the action of the fan.
radius ride
Glossary “radius ride” Definition:
Condition where the crankshaft rides on the edge of a bearing.
radius rods
Glossary “radius rods” Definition:
Term used for radius arms.
radiused
Glossary “radiused” Definition:
1). A procedure that is used to reduce the radius diameter at the area the valve stem that meets the valve head. 2). A valve type that is ground with a radial grinder to aid in air flow around the valve. 3). Wheel wells that have been cut into a circular shape.
rail dust
Glossary “rail dust” Definition:
The dust that falls on vehicles being shipped by rail. Similar to industrial fallout, but containing diesel particulates and powered iron.
rake
Glossary “rake” Definition:
Suspension or structural design to lower one end of the vehicle in relation to the other end.
radius arms
Glossary “radius arms” Definition:
Longitudinal suspension arms used to position a beam axle.