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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