Know your Strokes
What is the definition of preignition?
Ignition before the spark plug fires
A Continental O-200 engine would mean
A 200 cubic inch displacement Opposed Engine
In what way does Valve Overlap affect engine operation?
Better Exhaust Scavenging
How many degrees of crankshaft rotation does it take to complete all events in the Four-Stroke/Cycle
720 Degrees
What term best describes the explosion of the Fuel/Air Mixture in the Combustion Chamber?
Detonation
Dwell is?
The degrees of crankshaft rotation that both valves are closed
An IO-540 would mean?
An injected opposed 540 cubic inch engine
The actual power delivered to the propeller of an aircraft reciprocating engine is called:
Brake Horsepower
At what speed must a crankshaft turn, if each cylinder of a Four-Stroke/Cycle engine fires 200 times per minute?
400 RPM
How many Foot-Pounds of Work must be done in one minute to produce one Horsepower?
33,000
What is the second stroke of a four-stroke reciprocating engine?
Compression
An R-985 Engine would mean?
A radial 985 cubic inch displacement engine.
Air-cooled aircraft engines are the most popular because
They are less weight and less maintenance
The Exhaust Valve opens 60 degrees BBC and Closes 30 degrees ATC. The valve Span is:
270 Degrees
What is the Thermal Efficiency of an engine that produces 85 BHP, while burning 8.33 Gallons of Fuel Per Hour?
21.64 %
When all the pressure is off the pushrod in a four-cycle reciprocating it is safe to say
The valve is seated
A Lycoming TIO-541 Engine would mean.
A 541 cubic Inch, Turbo-charged, Injected, Opposed Engine.
Whose name is commonly associated with the development of the Four-Stroke/Cycle principle used in the reciprocating engine?
August Otto
The Volume of a Cylinder is 70 Cubic Inches when the piston is at BDC. When the piston is at TDC, the Volume is 10 Cubic Inches. What is the Compression Ratio?
7:1
Use the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated.
Intake opens 15° : BTDC
Exhaust opens 70° : BBDC
Intake closes 45° : ABDC
Exhaust closes 20° : ATDC
245°
Effective power is?
The amount of degrees during the power stroke before the exhaust valve opens
A Lycoming GIO-480 engine would mean
Gear reduction, injected, opposed, 480 cubic inch engine
When a reciprocating engine is properly timed, the Combustion process should be completed and peak pressure reached:
Just after TDC on the Power Stroke
Each cylinder of an 18 cylinder Twin-Row radial engine has a bore of six inches and a stroke of six inches. What is the total piston displacement of this engine?
3,053.6 Cubic Inches
How much heat energy is contained in one pound of Aviation Gasoline?
20,000 BTU’s