1

Automotive Engines

Part 3 (internal Parts)

2

Internal Parts of Block

3

Internal Parts of Block

1. Crankshaft – converts linear motion to rotational motion

2. Made from cast iron or forged steel

3. Cast iron = cheap

4. Forged Steel = strong

4

Crankshaft

Purple – PTO Flange Red – Crankpin, Throw, Offset Blue – Main Yellow – Counterweight Green - Snout

5

Internal Parts of Block

1. Piston – a cylindrical part fitted in a cylinder transmitting

power created by the combusting fuel & air

2. Cast Aluminum – Factory

3. Hypereutectic – Street/Strip

4. Forged – Hi-Perf

6

Piston

Blue – Dome Green – Ring Land Red – Skirt Purple – Wrist Pin

7

Internal Parts of Block

1. Connecting Rod – connects piston to crankshaft

2. I – Beam or H – Beam

3. Cast, Forged, Powdered Metal

4. Iron, Steel, Aluminum, Titanium

8

Connecting Rod

Blue: Big End

Green: Small End

Red: Bearings

9

Internal Parts of Block

1. Camshaft – controls valve movement (Dist. Drive, Fuel

Pump)

2. Two Main Types

Flat Tappet Solid or Hydraulic

Roller Mechanical or Hydraulic

10

Roller & Flat

11

Camshaft (Flat)

Flat Tappet Lobe: Narrow and “Peaky”

12

Camshaft (Roller)

Roller Lobe: Wide and flat

13

Tappets – Roller Vs. Flat

14

Flat Tappet (Hydraulic Vs. Solid)

15

Roller Tappet (Hydraulic Vs. Solid)

16

Internal Parts of Block

1. Timing Chain / Gears – connect crank to cam

17

Timing Chain / Gears

18

Internal Parts of Block

1. 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.

19

Gear Type

20

Rotor Type

21

Internal Parts of Block

1. 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)

22

Bearings

23

The End