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29 Cards in this Set
- Front
- Back
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Otto Cycle
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4 stroke, 5 event cycle
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Overhaul Types
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top, major
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Rebuilt Engine
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set to new parts limits (MFG only); engine is "zero timed"
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Overhauled Engine
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set to SVC limits
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TBO
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"time b/t overhauls", set by MFG
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Valve Overlap
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improves engine's volumetric efficiency
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Early Overhaul (main cause of)
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overheating
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Blowby
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air leaking from the crankcase, past piston rings
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HP relationships
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IHP = BHP + FHP
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Valve Float
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caused by high RPM and valve spring resonance
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METO
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maximum except takeoff power, same as max continuous power
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Critical Altitude
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max alt an engine will maintain a given HP
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Square Engine
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bore = stroke
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Ignition
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takes place slightly before TDC of compression stroke to improve power stroke efficiency.
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Limiting Factor of Compression Ratio
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fuel grade/detonation
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Prony Brake
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used to measure torque
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Piston Oil Rings
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control, compression, wiper/scraper
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Choked Bore
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slightly larger dia at the top than at the skirt
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Full-Floating
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most common piston pin types
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Piston-Ring End Gap
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allows for heat expansion
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Liquid Penetrant Limitation
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only reveals surface cracks
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Mag Particle Limitation
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only works on ferro-magnetic parts
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Extended Cylinder Skirts
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allows engine to be more compact by having cylinders sit closer to the case
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Extra-Long Cylinder Skirts for Inverted Engines
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prevents oil from leaking down into the cylinder, helps prevent hydraulic lock
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Babbit
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soft material typically used in plain berrings
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Chrome Plating
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wear resistant surface that can be applied to cylinder walls
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Metallic Sodium
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material used in valves to help dissipate heat
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Nitriding
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surface hardening process applied to cylinder barrels and crankshaft journals
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Stellite
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very hard, heat resistant alloy welded to valve faces and tips
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