Inaccurate performance data for BOB fighters in COD comparing to RL data

[TheGrunch]

Originally Posted by madrebel

because that was the only difference right?

These were the alterations made (dated March 20th 1940). After the alteration the only difference in actual operation was the modified boost cut-out control allowing the ability of the engine to be run on 100 octane fuel up to +12lbs. sq. in. The engine was still perfectly capable of being run on 87 octane fuel and indeed this would avoid the problem of lead fouling of the spark plugs if they had not been changed to the new ones.
You will note the last paragraph. Mechanics were not likely to run the engine up to +12lbs on the ground. Its use significantly reduced engine life.