Mechanical Arrangement Piston Engines The main bits and pieces that make up the piston engine

Mechanical Arrangement - Basics

Mechanical Arrangement - Basics Leg force in direction ‘B’ gives rotational force on pedal/crank propels bicycle along Hand force in direction ‘A’ gives rotational force on nut Mechanical Arrangement - Basics

Counter Balance Weight Gudgeon Pin Cylinder Main Bearings Piston Connecting Rod Offset Bearing ‘Big-end’ Counter Balance Weight Crank Shaft Mechanical Arrangement - Basics

3 2 4 1 Mechanical Arrangement - Basics Pistons 1 Timing Belt and Water Pump driving pulley location Flywheel attachment flange Rear Front Main Bearings Crankshaft Mechanical Arrangement - Basics

Exploded View of the Engine Mechanical Arrangement – Main Parts ‘Rocker Box’ Cover Valve Gear Cylinder Head Assembly Cylinder Block Timing Shaft Flywheel Crankshaft and Pistons Sump (Oil Tank) Mechanical Arrangement – Main Parts

Mechanical Arrangement – Valve Gear Valve Operation Inlet Valve Exhaust Valve The Inlet Valve needs to be open to allow fuel/air mixture in The Exhaust Valve needs to be open to allow burnt gases out Mechanical Arrangement – Valve Gear

Mechanical Arrangement – Valve Gear Inlet Valve Closed Inlet Valve Open Rocker Rocker Shaft Closing spring Valve Seat Push Rod Mechanism Push Rod Valve Lift Cam Shaft Mechanical Arrangement – Valve Gear

Overhead Cam and Rocker Overhead Cam -No Rocker Push Rod Mechanism Mechanical Arrangement – Valve Gear

Modern Engines use a toothed rubber belt to drive the cam shafts Twin Cam System Modern Engines use a toothed rubber belt to drive the cam shafts Chain Tensioners Crankshaft and Pistons Cam Drive Mechanism Mechanical Arrangement – Valve Gear

Mechanical Arrangement Put it all together How does it work? Mechanical Arrangement