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Automotive Engines. Part 3 (internal Parts). Internal Parts of Block. Internal Parts of Block. Crankshaft – converts linear motion to rotational motion Made from cast iron or forged steel Cast iron = cheap Forged Steel = strong. Crankshaft. Purple – PTO Flange
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Automotive Engines Part 3 (internal Parts)
Internal Parts of Block • Crankshaft – • converts linear motion to rotational motion • Made from cast iron or forged steel • Cast iron = cheap • Forged Steel = strong
Crankshaft • Purple – PTO Flange • Red – Crankpin, Throw, Offset • Blue – Main • Yellow – Counterweight • Green - Snout
Internal Parts of Block • Piston – • a cylindrical part fitted in a cylinder transmitting power created by the combusting fuel & air • Cast Aluminum – Factory • Hypereutectic – Street/Strip • Forged – Hi-Perf
Piston • Blue – Dome • Green – Ring Land • Red – Skirt • Purple – Wrist Pin
Internal Parts of Block • Connecting Rod – • connects piston to crankshaft • I – Beam or H – Beam • Cast, Forged, Powdered Metal • Iron, Steel, Aluminum, Titanium
Connecting Rod Blue: Big End Green: Small End Red: Bearings
Internal Parts of Block • Camshaft – • controls valve movement (Dist. Drive, Fuel Pump) 2. Two Main Types Flat Tappet • Solid or Hydraulic Roller • Mechanical or Hydraulic
Camshaft (Flat) Flat Tappet Lobe: Narrow and “Peaky”
Camshaft (Roller) • Roller Lobe: Wide and flat
Internal Parts of Block • Timing Chain / Gears – • connect crank to cam
Internal Parts of Block • Oil Pump – pushes oil throughout engine • Gear Type • A pair of gears mesh with each other and revolve in a close fitting housing. Oil fed in at one side is carried out round the edge and out the outer side. • Rotor Type • An inner rotor meshes with the outer one which has one more lobe. Having different axes of rotation the spaces vary in size, causing oil to be drawn in and forced out.
Internal Parts of Block • Bearings (2 types) • Plain • Roller • Plain type: item rides on a film of oil • Three types • Mains – allow crank to spin (2 piece) • Rods – allow rods to spin (2 piece) • Cam – allow cam to spin (1 piece)