I've been hearing a lot of complaints lately from truckers saying their losing power in the altitude. This summer we've had 80 F degrees plus many days in the west at 8 to 9,000 feet altitude. Normally on a warm day it's in the 60 F range at that elevation.
Talk about less power from a turbo diesel.. Air density goes down the tube and turbo shaft speeds are up usually up 20 to 30% and egt's 10%. This morning it cooled down under 60 F and before I looked I thought I'd left the Pitts on 2 instead of 1.
I'd guess about 40/50 hp difference between 60 and 80 degrees F at that elevation.
The guy hauling for us the other day blew a compressor wheel up at about 8k on a 3406E 550 hp KW. Lucky the intercooler caught most of the big parts and no damage to the internals on the motor.
