Automotive Service Modern Auto Tech Study Guide

Chapter 12

Pages 162 - 181

Engine Classifications & Variations

35 Points

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1-12. List at least 12 common ways to classify engines by their

variations in design:

Year Cooling System

Make (Manufacturer of the engine) Location of Engine in the Vehicle

Horsepower or Watts Mounting: Transverse or Longitudinal

Torque Piston or Rotary

# of Cylinders Cycle of Operation

Cylinder Arrangement Compression Ratio

Cylinder Numbering Ignition System

# of Valves Spark or Compression Ignition

Valve Arrangement Bore

# of Camshafts Stroke

Camshaft Location (OHV or OHC) Camshaft Drive: Gear, Chain, Belt

Firing Order Displacement = Total Cylinder Volume

Turbo or Super Charged or Neither Fuel Type: Diesel or Gas

Fuel Delivery System (MPI or GDI) Atkinson Cycle or Miller Cycle

Automotive Service Click this square for a 4 stroke cycle engine explanation

Automotive Service 13. Name three engine cylinder arrangements:

In-Line, V-shape, Flat or “Boxer”, Slant

Automotive Service 14. ______________ ____________ is the sequence in which

the cylinders fire or ignite their air/fuel mix.

Pecking Order

Firing Order

Back Order

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Automotive Service 15. Engines can be either __________ or ______ cooled.

____________ cooling is the most common.

Air or Liquid

Gas or Water

Vacuum or Pressure

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16. Spark ignition engines use a ________ plug to ignite their air/fuel mixture.

____________________ ignition engines use the intense heat of a 20:1

compression ratio to ignite the fuel. (these are diesel engines)

Glow Plug

Freeze Plug

Spark Plug

Compression

Combustion

Combination

Automotive Service 17. Valve arrangements are either ___-head, ___-head, ___-head or ___-head.

(remember the word LIFT)

The I-head design, a.k.a. the valve-in-head or Over Head Valve (OHV) design

is the most common in use.

L-head, I-head, F-head, T-head

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Over Head Camshaft

Piston

Combustion Chamber

Cylinder Head

Over Head Valve

18. Camshafts can be located in the engine block or in the

______________ ________. (Over Head Camshaft = OHC)

Automotive Service Click this square for a diesel engine explanation

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19. There’s a variety of ___________________ chamber shapes, but the

hemishperical is one of the most efficient.

Combustion

Compression

Combination

Automotive Service 20.Variable DISPLACEMENT, variable COMPRESSION ratio, and variable

VALVE timing are now popular designs used to increase horsepower and fuel

mileage.

Automotive Service 20.Variable DISPLACEMENT, variable COMPRESSION ratio, and variable

VALVE timing are now popular designs used to increase horsepower and fuel

mileage.

Automotive Service 20.Variable DISPLACEMENT, variable COMPRESSION ratio, and variable

VALVE timing are now popular designs used to increase horsepower and fuel

mileage.

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Displacement on Demand®

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Automotive Service 21. The ____________ engine, also known as the Wankel engine uses a spinning

triangular rotor instead of conventional pistons. It is currently used in only the

Mazda RX-8 and called the Renesis® engine.

Rotax

Rotary

Romulan Dr. Felix Wankel

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Automotive Service Click this square for a rotary engine explanation

Automotive Service 21. ______ stroke cycle engines produce power with every down stroke.

Some diesel engines and some lawn & garden applications use this design,

but no automobiles currently use it.

2 Stroke cycle

3 Stroke cycle

4 Stroke cycle

Automotive Service Click this square for 2 stroke cycle engine explanation

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22. Engines are also classified by whether they “breath” normally or are

____________________ like the Miller-cycle engine.

Turbocharging the incoming air with an exhaust-powered fan is also popular.

http://auto.howstuffworks.com/supercharger.htm

Supercharged

Super-sized

Superceded

Automotive Service Click this square for Supercharger & Turbocharger explanation

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Bank 1 on a V-shaped engine

has cylinder #1

Cylinder #1 is the

most forward cylinder

In-Line 4 Cylinder Engine

V-8 Cylinder Engine

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