Otto Cycle Flashcards
1
Q
Why is the theoretical Otto cycle not used ?
A
Slow, suffer from a loss of power and be less efficient
2
Q
What is volumetric efficiency?
A
The efficiency with which the engine can move the charge into and out of the cylinders
3
Q
What improves volumetric efficiency?
A
Force induction -turbo/supercharger
Agressive cam phasing
4
Q
What are the 5 events of the Otto cycle ?
A
Induction Compression Ignition Power Exhaust
5
Q
What is valve lead?
A
Early opening , reduces gas loads on bearings
6
Q
What is valve lag?
A
Late closing
Ensure maximum induction of charge compatible with efficient performance
7
Q
What is Ineffective crank angle ?
A
Occurs when the piston is at the extremes of the stroke , TDC and BDC
8
Q
Valve overlap is defined as ?
A
The time of when both IV + OV are open simultaneously
