Question

some new camshaft break - in procedures require the engine to start and to run at ______ revolutions per minute (rpm) for 20 or 30 minutes to provide proper lubrication and break - in.
a. 1,000 to 1,800
b. 1,200 to 2,000
c. 1,400 to 2,200
d. 1,600 to 2,400

Explanation:

Standard camshaft break-in procedures specify a moderate RPM range to ensure adequate oil pressure for lubrication of new camshaft components, while avoiding excessive stress. The 1,500-2,000 RPM range (closely matching option b) is the industry standard for this process over 20-30 minutes.

Answer:

b. 1,200 to 2,000