Glossary “DP” Definition:
Dash Pot, or Dual Plug
d
DPD
Glossary “DPD” Definition:
Dual Point Distributor
DPDIS
Glossary “DPDIS” Definition:
Dual Plug Distributorless Ignition System
DPDT
Glossary “DPDT” Definition:
Double Pole Double Throw.
downward spring-and-wheel action
Glossary “downward spring-and-wheel action” Definition:
Term used for rebound travel of the suspension.
downshift
Glossary “downshift” Definition:
The automatic shift from a high gear ratio to a low gear ratio.
downshift valve
Glossary “downshift valve” Definition:
An auxiliary shift valve that increases throttle pressure to force a downshift under high engine loads, also called a kickdown or detent valve.
downstream
Glossary “downstream” Definition:
Direction indicating the location of a component or fault from it’s source. 1). A downstream 02 is after the catalytic converter. 2). A open in the circuit may be downstream (toward the ground) or up-stream (toward the positive) from the point in the circuit you where you are testing. 3). Air pump discharge is directed downstream to the catalytic converter.
downstream blower
Glossary “downstream blower” Definition:
A blower arranged in the duct system so as to pull air through the heater and/or air-conditioner core(s).
downtime
Glossary “downtime” Definition:
1). The time a system or machine is not available for use, due to failure or routine maintenance. 2). Time lost due to lack of needed parts.
downforce
Glossary “downforce” Definition:
Downward force of air upon a moving vehicle.
downloading
Glossary “downloading” Definition:
To copy data (usually an entire file) from a main source to a peripheral device.
DOV
Glossary “DOV” Definition:
Dual Orifice Valve
dowel
Glossary “dowel” Definition:
Pin inserted in an object or part to aid in the alignment of another object or part.
dowel pin
Glossary “dowel pin” Definition:
Round, solid, or hollow pin used to align two or more parts.
downdraft carburetor
Glossary “downdraft carburetor” Definition:
A carburetor having a downward airflow.
downdraft spray booth
Glossary “downdraft spray booth” Definition:
Forces air from the ceiling down through exhaust vents in the floor.
downflow radiator
Glossary “downflow radiator” Definition:
A radiator in which the coolant flow is from the top tank to the bottom tank.
double wishbone
Glossary “double wishbone” Definition:
Term used for double A-arm type of suspension.
double wrap
Glossary “double wrap” Definition:
A flexible type of brake band designed with two segments that provide flexibility, which increases self-energizing action, used as bands in an A/T.