Interesting aside about the Doolittle Raid Mitchells ...
The engines were specially tweaked (carb modifications) to increase range, and they were pushed well beyond their limits during both the launch and the mission. If they’d successfully made it to the AVG in China the engines would have been ruined and needed immediate replacement.
A number of years back pictures of Ski York’s Mitchell (the only one that successfully landed) on the ground in Vladivostok following the mission surfaced. The engine nacelles were seriously stained from the exhaust ...
Thanks.