Bore (engine)

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Bore is the diameter measurement of the cylinders in a piston engine.

Engine displacement is calculated by:

$\mbox{displacement} = {\pi\over 4} \times \mbox{bore}^2 \times \mbox{stroke} \times \mbox{number of cylinders}$

The term "bore" can also be applied to the bore of a locomotive cylinder.

[edit] See also

v t e Heat engines

Carnot engine · Fluidyne · Gas turbine · Hot air · Jet · Photo-Carnot engine · Piston · Pistonless (Rotary) · Rijke tube · Rocket · Split-single · Steam (reciprocating) · Steam turbine · Stirling · Thermoacoustic

Beale number · West number

Timeline of heat engine technology

Thermodynamic 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 Generator Electronic fuel injection Ignition system Magneto Spark plug Starter motor Terminology Air-cooled 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 Rotary engine Shock-cooling Stroke Time between overhaul Two-stroke engine Valve timing Volumetric efficiency

Propellers	Components Propeller speed reduction unit Propeller governor Spinner Terminology Autofeather Blade pitch Contra-rotating Constant speed Counter-rotating Scimitar propeller Single-blade propeller Variable pitch

Engine instruments	Tachometer Hobbs meter Annunciator panel EFIS EICAS Flight data recorder Glass cockpit

Engine controls	Carburetor heat Throttle

Fuel and induction system	Avgas Carburetor Fuel injection Gascolator Inlet manifold Intercooler Pressure carburetor Supercharger Turbocharger

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 Crossflow cylinder head Crossplane Cylinder bank Cylinder block Cylinder head Flywheel Head gasket Hypereutectic piston Main bearing Piston Piston ring Reverse-flow cylinder head 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 Unit Injector

Electrics, ignition and engine management	Air-fuel ratio meter Alternator Automatic Performance Control Car battery Contact breaker Crankshaft position sensor Distributor Dynamo Drive by wire Electrical ballast Electronic control unit Engine control unit Engine coolant temperature sensor Glow plug High tension leads Idle air control actuator Ignition coil Lead–acid battery Magneto MAP sensor Mass flow sensor Oxygen sensor Spark plug Starter motor Throttle position sensor

Exhaust system	Automobile emissions control Catalytic converter Diesel particulate filter Exhaust manifold Glasspack Muffler

Engine cooling	Air cooling Antifreeze Core plug Electric fan Ethylene glycol Fan belt Radiator Thermostat Water cooling Viscous fan

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

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