Per Redroach's post above, the Spitfires have the mixture control incorrectly reversed in Cliffs of Dover. The Hurricanes have the mixture control modelled correctly: Pull backwards for Rich, push forward (toward the instrument panel) for Lean. When CoD was first released last year, a lot of Merlins got destroyed over this confusion until it got sorted out. Surprisingly, this seemingly easy fix was never rectified so newcomers are still frying Merlins as a result.
To confuse the issue further, when flying a Spitfire IIa at low level you go "through the gate" with your throttle and hit 12 lbs of boost at 3000 rpm with your lever in Rich position your aircraft begins to shake, throwing your aim off. Pull the mixture lever back to lean and your aircraft smooths right out -- until it blows a head gasket after about 2 minutes (on a good day).
So, you have a choice at 12 lbs boost, 3000 rpm low level in a IIa: strong shaking (rich mixture) for 2 minutes before you kill your engine, or silky smooth (lean mixture) for two minutes before you kill your engine. Or push your WEP button for 1.33 ata repeatedly with no ill effects at all for a whole tankful of gas. Oops - sorry, the Spits and Hurries don't have that feature.....
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