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Glossary

H

HAIRPIN
A slow, 180-turn, which exits in the opposite direction a driver enters.
HAMMER DOWN
The driver has the pedal to the metal or has "dropped the hammer" full throttle.
HEADERS
A fine-tuned exhaust system on NHRA cars that routes exhaust from the engine; replacing conventional exhaust manifolds.
HEADSOCK
A fire resistant head mask or balaclava.
HELICOPTER TAPE
Used to cover and protect exposed areas from flying debris, as helicopter technicians developed it to protect rotors.
HEMI
A Hemi engine, used in NHRA action, has a hemispherical shaped cylinder-head combustion chamber, like a ball cut in half.
HOLE SHOT
Drag racing term describes beating an opponent off the starting line and winning a race despite having a slower elapsed time. Other racers use this term to describe a good start or restart.
HOMOLOGATED
Examination process by which the FIA ensures that rally cars comply with regulations.
HOOKED UP
A car is performing great when all parts are "hooked up" or working well together.
HORSEPOWER
The estimated power needed to lift 33,000 lbs. one foot per minute, roughly equated with a horse's strength.
HOT LAP
A car(s) running at or near racing speed on the course.
HOT PITS
A car(s) is/are on the track. Only crew members and racing officials are allowed into the pits for safety reasons.
HYDRAULIC
When an NHRA car's cylinder fills with too much fuel, thus prohibiting compression by the cylinder and causing a mechanical malfunction, usually an explosive one.
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