Bore (engine)

The bore or cylinder bore is a part of a piston engine. The bore also represents the size, in terms of diameter, of the cylinder in which a piston travels. The value of a cylinder's bore, and stroke, is used to establish the displacement of an engine.^[1]

The term "bore" can also be applied to the bore of a locomotive cylinder or steam engine pistons.

References

1. 
   ^ Schwaller, Anthony (1999). Motor Automotive Technology. Delmar, New York
   

See also

• Bore pitch


• Compression ratio


• Engine displacement


• Four-stroke cycle


• Steam engine


• Stroke (engine)


• Two-stroke cycle

v t e Aircraft piston engine components, systems and terminology
Piston engines	Mechanical components Camshaft Connecting rod Crankpin Crankshaft Cylinder Cylinder head Gudgeon pin Hydraulic tappet Main bearing Obturator ring Oil pump Piston Piston ring Poppet valve Pushrod Rocker arm Sleeve valve Tappet Electrical components Alternator Capacitor discharge ignition Dual ignition Electronic fuel injection Generator Ignition system Magneto Spark plug Starter Terminology Air-cooled Aircraft engine starting Bore Compression ratio Dead centre Engine displacement Four-stroke engine Horsepower Ignition timing Manifold pressure Mean effective pressure Naturally aspirated Monosoupape Overhead camshaft Overhead valve engine Rotary engine Shock cooling Stroke Time between overhauls Two-stroke engine Valve timing Volumetric efficiency
Propellers	Components Propeller governor Propeller speed reduction unit Spinner Terminology Autofeather Blade pitch Constant-speed Contra-rotating Counter-rotating Scimitar Single-blade Variable-pitch
Engine instruments	Annunciator panel EFIS EICAS Flight data recorder Glass cockpit Hobbs meter Tachometer
Engine controls	Carburetor heat Throttle
Fuel and induction system	Avgas Carburetor Fuel injection Gascolator Inlet manifold Intercooler Pressure carburetor Supercharger Turbocharger Updraft carburetor
Other systems	Auxiliary power unit Coffman starter Hydraulic system Ice protection system Recoil start

v t e Automotive engine
Part of the Automobile series
Basic terminology	Bore Compression ratio Crank Cylinder Dead centre Diesel engine Dry sump Engine balance Engine configuration Engine displacement Engine knocking Firing order Hydrolock Petrol engine Power band Redline Spark-ignition engine Stroke Stroke ratio Wet sump
Main components	Connecting rod Crankcase Crankpin Crankshaft Crossplane Cylinder bank Cylinder block Cylinder head (crossflow, reverse-flow) Flywheel Head gasket Hypereutectic piston Main bearing Piston Piston ring Starter ring gear Sump
Valvetrain	Cam Cam follower Camshaft Desmodromic valve Hydraulic tappet Multi-valve Overhead camshaft Overhead valve Pneumatic valve springs Poppet valve Pushrod Rocker arm Sleeve valve Tappet Timing belt Timing mark Valve float Variable valve timing
Aspiration	Air filter Blowoff valve Boost controller Butterfly valve Centrifugal-type supercharger Cold air intake Dump valve Electronic throttle control Forced induction Inlet manifold Intake Intercooler Manifold vacuum Naturally aspirated engine Ram-air intake Scroll-type supercharger Short ram air intake Supercharger Throttle Throttle body Turbocharger Twin-turbo Variable-geometry turbocharger Variable-length intake manifold Warm air intake
Fuel system	Carburetor Common rail Direct injection Fuel filter Fuel injection Fuel pump Fuel tank Gasoline direct injection Indirect injection Injection pump Lean-burn Stratified charge engine Turbo fuel stratified injection Unit injector
Ignition	Contact breaker Magneto Distributor Electrical ballast High tension leads Ignition coil Spark plug Wasted spark
Electrics and engine management	Air–fuel ratio meter Alternator Automatic Performance Control Car battery (lead–acid battery) Crankshaft position sensor Dynamo Drive by wire Electronic control unit Engine control unit Engine coolant temperature sensor Glow plug Idle air control actuator MAP sensor Mass flow sensor Oxygen sensor Starter motor Throttle position sensor
Exhaust system	Automobile emissions control Catalytic converter Diesel particulate filter Exhaust manifold Glasspack Muffler
Engine cooling	Air cooling Antifreeze (ethylene glycol) Core plug Electric fan Fan belt Radiator Thermostat Water cooling Viscous fan (fan clutch)
Other components	Balance shaft Block heater Combustion chamber Cylinder head porting Gasket Motor oil Oil filter Oil pump Oil sludge PCV valve Seal Synthetic oil Underdrive pulleys
Portal Category

v t e Steam engines
Operating cycle	Atmospheric Watt Cornish Compound Uniflow
Valves	Valves Slide D slide Piston Drop Corliss Poppet Sleeve Bash Valve gear Gab Stephenson link Joy Walschaerts Allan Baker Corliss Lentz Caprotti Gresley conjugated Southern
Mechanisms	Beam Cataract Centrifugal governor Connecting rod Crank Crankshaft Hypocycloidal gear Link chain Parallel motion Plate chain Rotative beam Sun and planet gear Watt's linkage
Boilers	Simple boilers Haystack Wagon Egg-ended Box Flued Cornish Lancashire Fire-tube boilers Locomotive Scotch Launch Water-tube boilers Babcock & Wilcox Field-tube Sentinel Stirling Thimble tube Three-drum Yarrow Boiler feed Feedwater heater Feedwater pump Injector
Cylinder	Locomotive Oscillating Single- and double-acting
Condenser	Condensing steam locomotive Jet Kirchweger Watt's separate "Pickle-pot" Surface
Other	Crosshead Cutoff Expansion valve Hydrolock Piston Reciprocating engine Return connecting rod engine Six-column beam engine Steeple engine Safety valve Steeple compound engine Stroke Working fluid
History	Precursors Savery Engine (1698) Newcomen engine Newcomen Memorial Engine (1725) Fairbottom Bobs (1760) Elsecar Engine (1795) Watt engine Beam Kinneil Engine (1768) Old Bess (1777) Chacewater Mine engine (1778) Smethwick Engine (1779) Resolution (1781) Rotative beam Soho Manufactory engine (1782) Bradley Works engine (1783) Whitbread Engine (1785) National Museum of Scotland engine (1786) Lap Engine (1788) High-pressure Richard Trevithick Puffing Devil (1801) London Steam Carriage (1803) "Coalbrookdale Locomotive" (1803) "Pen-y-Darren" locomotive (1804) Compound Woolf's compound engine (1803) Murray Murray's Hypocycloidal Engine (1805) Salamanca (1812) High-speed Porter-Allen (1862) Ljungström (1908)
See also	Glossary of steam locomotive components History of steam road vehicles Cugnot's fardier à vapeur (1769) Murdoch's model steam carriage (1784) Lean's Engine Reporter List of steam technology patents Modern steam Stationary steam engine Timeline of steam power Water-returning engine

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