123 Copyright by Goodheart-Willcox Co., Inc. Chapter 6 Engine Types and Classifications Technical Terms balancer shaft cam-in-block engine cast iron crankshaft compression ignition crossflow combustion chamber cylinder arrangement dual overhead camshafts (DOHC) externally balanced firing order forged steel crankshaft four-valve combustion chamber fuel injected gasoline engine hemispherical combustion chamber I-head engine inline engine internally balanced L-head engine noncrossflow (backflow) combustion chamber normally aspirated opposed engine overhead camshaft engine (OHC) pancake combustion chamber pent-roof combustion chamber single overhead camshaft (SOHC) spark ignition stratified charge combustion chamber swirl combustion chamber two-valve combustion chamber V-type engine wedge combustion chamber W-type engine After studying this chapter, you will be able to: • Describe the different engine cylinder arrangements. • Explain cylinder numbering and firing order. • Identify different crankshaft configurations. • List the two types of cooling systems. • Describe different fuel metering systems. • Explain different types of ignition. • Describe combustion chamber designs. • Classify an engine by its valve location. • Compare cam-in-block and overhead camshaft engine designs. • Explain different methods of engine aspiration. • Describe alternative engine designs.