Glossary “joint penetration” Definition:
Depth a filler metal extends from its face into a joint, exclusive of weld reinforcement.
j
joule(J)
Glossary “joule(J)” Definition:
A unit of energy, measured in newtons per meter. The rate of using joules per second is watts.
jounce
Glossary “jounce” Definition:
The inward reaction of the spring and shock absorber when a wheel hits an obstruction.
joint angle
Glossary “joint angle” Definition:
The angle formed by the input and output shafts of CV joints. Outer joints can typically operate at angles up to 45¡ã, whereas inner joints have more restricted angles.
JMS
Glossary “JMS” Definition:
Jet Mixture Solenoid
Johnson rod
Glossary “Johnson rod” Definition:
A mythical automotive component that is blamed for any problem that cannot otherwise be explained.
joint
Glossary “joint” Definition:
Junction of members that are to be joined or have been joined.
JFET
Glossary “JFET” Definition:
Junction Field Effect Transistor: Field effect transistor formed by combining layers of semiconductor material. The JFET has an input impedance equal to the reverse bias impedance of a p-n junction. This impedance is approximately 20,000 M ohms.
jig
Glossary “jig” Definition:
1). Fixture for holding work. 2). Device used as an aid to straighten the frame of a vehicle.
JIS
Glossary “JIS” Definition:
Japanese Industrial Standard.
Jeep
Glossary “Jeep” Definition:
Just Empty Every Pocket, or Just Eats Every Part
jerk
Glossary “jerk” Definition:
Sudden lurch occurs due to power flow interruption during acceleration.
jet
Glossary “jet” Definition:
Calibrated passage in the carburetor used to meter fuel flow. A metered orifice in a carburetor which meters fuel flow. Larger jets allow more fuel to flow than smaller jets. Jets are usually replaceable and available in different sizes.
jet car
Glossary “jet car” Definition:
Race car powered by a jet aircraft engine.
jet valve
Glossary “jet valve” Definition:
An intake valve, located in a precombustion chamber, that admits a highly concentrated air/fuel mixture into a stratified charge engine.
Japanese Industrial Standards (JIS)
Glossary “Japanese Industrial Standards (JIS)” Definition:
Japan’s equivalent of the DIN in Germany or the SAE in the United States.
J/B
Glossary “J/B” Definition:
Junction Block
jamb nut
Glossary “jamb nut” Definition:
A locknut
JAMA
Glossary “JAMA” Definition:
Japan Automobile Manufacturers Association.
jackshaft
Glossary “jackshaft” Definition:
Shaft found in most overhead cam engines that can be used to drive the distributor, fuel pump, and oil pump.