Naturally Aspirated
(Engine)
Octane Number
Oil Temperature Control
Valve
Overboost Valves
Overhead Valves
Performance Rating
Permold
Pressure Altitude
Propeller Load Curve
Propeller Pitch
Ram
Rated Power
Retard Breaker
Rich Limit
Rocker Arm
A term used to describe an engine which obtains induction air by drawing
it directly from the atmosphere into the cylinder. A non-supercharged
engine.
A rating which describes relative anti-knock (detonation) characteristics
of fuel. Fuels with greater detonation resistance than 100 octane are
given performance ratings.
A thermostatic valve used to divert oil through or around the oil cooler,
as necessary, to maintain oil temperature within desired limits (ref.
vernatherm valve).
A pressure relief valve, set slightly in excess of maximum deck pressure,
to prevent damaging overboost in the event of a system malfunction.
An engine configuration in which the valves are located in the cylinder
head itself.
A rating system used to describe the ability of fuel to withstand heat and
pressure of combustion as compared with the 100 octane fuel. For
example, an engine with high compression and high temperature needs a
higher Performance Rated fuel than a low compression engine. A rating
of
100/130 denotes performance characteristics of lean (100) and rich
(1
30)
mixtures respectively.
A term used to describe a process by which a crankcase is made. An
engine with a
permold crankcase has a front, right-hand mounted, gear
driven alternator.
Altitude, usually expressed in feet, (using absolute static pressure as a
reference) equivalent to altitude above the standard sea level reference
plan (29.92: Hg. Standard).
A plot of horsepower, versus RPM, depicting the power absorption
characteristics of a fixed pitch propeller.
The angle between the mean chord of the propeller and the plane of
rotation.
The absolute thermodynamic pressure measured by the number of pounds
force exerted on an area of one square inch.
Increased air pressure due to forward speed.
The maximum horsepower at which an engine is approved for operation.
A device used in magnetos to delay ignition during cranking.
It
is used
to facilitate starting.
The richest
fuellair ratio permitted for a given power condition. It is
not necessarily the richest condition at which the engine will run.
A mechanical device used to transfer motion from the
pushrod to the
valve.
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