Basic Engine Topics are going to include many of the components and parts contained inside your engine.

The list of parts below are usually called hard parts, because they are the hard metal components inside of an engine.

Many of these basic engine topics will include:

  • Troubleshooting
  • Engine Rebuilding
  • Engine Repair
  • Basic Engine Machining
  • With Some Engine Testing

Choose Your Help Topic Below

Connecting Rods – Tie It All Together

Crankshafts – Convert The Vertical Movement Of Pistons Into A Rotation

Cylinder Heads – Usually Called The Top End Of The Engine

Diesel Engine Topics – They Are Sophisticated And Difficult To Diagnose

Engine Bearings – Enable Moving Parts To Spin Freely In The Engine

Engine Blocks – Contain All Of The Major Components

Basic Engine Machining – Not All Machine Shops Are The Same

Engine Rebuilding – What You Need To Know Before You Start

Mechanical Problems – Some Of The Most Costly Repairs

Oil Pressure – What Does It Do – Why Do You Need It

Piston Rings – Seal The Combustion Chamber While Dissipating Heat

A four-stroke engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft.

  • Intake: This stroke of the piston begins at top dead center (T.D.C.) and ends at bottom dead center (B.D.C.). In this stroke the intake valve must be in the open position while the piston pulls an air-fuel mixture into the cylinder by producing vacuum pressure into the cylinder through its downward motion. The piston is moving down as air is being sucked in by the downward motion against the piston.
  • Compression: This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Both the intake and exhaust valves are closed during this stage.
  • Combustion: This is the start of the second revolution of the four stroke cycle. At this point the crankshaft has completed a full 360 degree revolution. While the piston is at T.D.C. (the end of the compression stroke) the compressed air-fuel mixture is ignited by a spark plug (in a gasoline engine) or by heat generated by high compression (diesel engines), forcefully returning the piston to B.D.C. This stroke produces mechanical work from the engine to turn the crankshaft.
  • Exhaust: During the exhaust stroke, the piston, once again, returns from B.D.C. to T.D.C. while the exhaust valve is open. This action expels the spent air-fuel mixture through the exhaust valve.

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