Jim Underdahl Pre Race Report

Jim Underdahl Pre Race Report 2011 NHRA FULL THROTTLE DRAG RACING SERIES Pro Stock Motorcycle Round 3 of 16 Summit Racing Equipment NHRA Southern Nationals Atlanta Dragway ATLANTA, Ga. (May 12, 2011) Underdahl works to control effects of Atlanta's humidity; PSM rider relies on engine changes and data to get down the track. When a meteorologist talks about humidity, he is usually referring to the amount of water vapor in the air and how that makes us feel. When NHRA Pro Stock Motorcycle rider Jim Underdahl talks about it, however, he is referring to the density of the air, the number of grains of water, and how that affects his motor's combustion and his on-track performance. This weekend, at the Summit Racing Equipment NHRA Southern Nationals at Atlanta Dragway, Underdahl and his crew chiefs will be keeping a close eye on the water in the air - and on the ground.