Power And Performance III Tuners Practice Test

The VE for a stock two-valve, four-stroke engine is 95%.

False True Depends on RPM Cannot be determined

Correct Answer:

False

Explanation:

Volumetric efficiency measures how effectively the cylinder is filled with air compared to the ideal fill at the same pressure. In a stock two-valve, four-stroke engine, air has to travel through restrictive intake ports, valve openings, and the throttle, and timing effects can cause pressure losses. These factors keep filling below the ideal 100% and make VE vary with engine speed, cam timing, and other operating conditions. Because VE isn’t a fixed value and can change across RPM ranges—and it’s not guaranteed to sit at a specific number like 95%—stating that the VE is 95% for a stock setup isn’t generally correct. It can approach that value in some conditions, but it’s not universal.

Access more questions from this quiz

Continue to Power and Performance III Tuners Practice Test for more practice questions and the full quiz experience.

Access More Questions