Section 14 - Engine Testing - Group 14 Engine Testing - General Information M11 Page 14-11 Next, find the curved line in the graph (B) closest to the measured intake manifold temperature recorded during the test. If the measured intake manifold temperature is for example 130°F, put a mark in the middle of the curved lines representing 49°C and 60°C [120°F and 140°F] intake manifold temperature. This mark must intersect the vertical line (A) drawn through the measured compressor inlet temperature. Draw a horizontal line (C) from this mark to the vertical axis. Where it crosses the vertical axis, the number obtained will be either a positive number, a negative number or zero.
The charts provide correction factors from -15 to +15 in-Hg. This number now must be added or subtracted to each end of the boost specification range. This example yielded a zero (0) correction factor.