Av43
Terms
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- Otto Cycle
- 4 stroke, 5 event cycle
- Overhaul Types
- top, major
- Rebuilt Engine
- set to new parts limits (MFG only); engine is "zero timed"
- Overhauled Engine
- set to SVC limits
- TBO
- "time b/t overhauls", set by MFG
- Valve Overlap
- improves engine's volumetric efficiency
- Early Overhaul (main cause of)
- overheating
- Blowby
- air leaking from the crankcase, past piston rings
- HP relationships
- IHP = BHP + FHP
- Valve Float
- caused by high RPM and valve spring resonance
- METO
- maximum except takeoff power, same as max continuous power
- Critical Altitude
- max alt an engine will maintain a given HP
- Square Engine
- bore = stroke
- Ignition
- takes place slightly before TDC of compression stroke to improve power stroke efficiency.
- Limiting Factor of Compression Ratio
- fuel grade/detonation
- Prony Brake
- used to measure torque
- Piston Oil Rings
- control, compression, wiper/scraper
- Choked Bore
- slightly larger dia at the top than at the skirt
- Full-Floating
- most common piston pin types
- Piston-Ring End Gap
- allows for heat expansion
- Liquid Penetrant Limitation
- only reveals surface cracks
- Mag Particle Limitation
- only works on ferro-magnetic parts
- Extended Cylinder Skirts
- allows engine to be more compact by having cylinders sit closer to the case
- Extra-Long Cylinder Skirts for Inverted Engines
- prevents oil from leaking down into the cylinder, helps prevent hydraulic lock
- Babbit
- soft material typically used in plain berrings
- Chrome Plating
- wear resistant surface that can be applied to cylinder walls
- Metallic Sodium
- material used in valves to help dissipate heat
- Nitriding
- surface hardening process applied to cylinder barrels and crankshaft journals
- Stellite
- very hard, heat resistant alloy welded to valve faces and tips