Engine Fundamentals. Engine Classification. Lesson 9. March 2008. Engine Classification. Even though basic parts are the same, design differences can change the way engines operate and how they are repaired For this reason, you must be able to classify engines. Internal Combustion Engines.
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YouTube - engine configurations
Engines are classified by the location of the valves:
Both the intake and exhaust valves are in the block
Both valves are in the cylinder head
Note the adjustment screw on the end of the rocker arm. Not all rocker arms have this adjustment. Check the shop manual for adjustment procedures.
Notice that the pushrod and rocker arm have
been eliminated in this OHC engine. Less moving parts in the transmission of camshaft motion to open the valve.
This not only reduces friction points and weight but also less points for wear and component breakage.
NOTE-not all OHC have eliminated the rocker arms.
(See next slide)
Uses two exhaust valves and two intake valves to increase flow
Causes the air-fuel mixture to swirl as it enters the chamber, improving combustion