Piston Engine Types – 2 Stroke Cycle Port A – Crankcase Inlet Port C - Exhaust Port B – Cylinder Inlet Piston rising pulls fuel/air mixture into crankcase; compression causes combustion Piston pushed down forces fuel/air mixture into cylinder Piston at BDC Stroke 2 Piston at TDC Stroke 1
Mechanical Arrangement – Petrol Engine Cross Section Same mechanical set-up as petrol engine InletExhaust But no spark plugs! Direct Injection Indirect Injection Diesel Combustion initiated by hot compressed air
Mechanical Arrangement – Wankel Engine Inlet Port Exhaust Port Casing Spark Plug Output Shaft Rotating Triangular ‘Piston’ Fixed (non- rotating) Pinion This motion drives the rotating crankshaft Which in turn drives the output shaft The piston rotates around the fixed pinion But the shape of the piston and the casing also make the piston move up and down by a small amount as well Rotating ‘Crankshaft’ Engine Cross Section Points of contact marked in yellow
Chamber A Engine Cycle Chamber C Inlet Port Exhaust Port Chamber B Mechanical Arrangement – Wankel Engine
Le Rhone Mechanical Arrangement – Radial/Rotary Engines Cylinders Crankcase Valve Gear Valve Pushrod Spark Plug Propeller Mount Bolts
Radial powered motorbike Mechanical Arrangement – Radial/Rotary Engines Radial (viewed from the side) Rotary (viewed from the side) 28 Cylinder Radial Model aero engine Aircraft Nose (viewed from the front) Radial/Rotary
Flat Twin Hand Held Is there any limits to size? They go from tiny: - Mechanical Arrangement – Engine Size Cylinder Liners Cylinder Block Cylinder Head Bolts Flywheel Crankshaft To fairly big!
That was a brief explanation of various internal combustion engine variants Mechanical Arrangement There are more variations to be found on the internet