the Blenheim talk

[Blackdog_kt]

The engines break for me too while in flight if i use high boost settings. The only advice i can offer until we have some documentation for CEM is not to use the extra boost (so, set the boost cut-out to off, the cockpit lever should be pointing upwards) or use it only if you gradually and slowly throttle up.
In my test flight it seemed that abrupt power changes break the oil gaskets and that's not entirely unrealistic, considering that my oil temps were a mere 40 degrees tops (cold oil is more dense and it can break pipelines and so on if an increased flow is forced suddenly).

In general, the radials seem more sensitive to temperature effects and you can even have them almost stall on you or run very rough if you throttle down during a long descent (had this happen in the G.50). I just don't know if this is due to spark plug fouling from prolonged idle or due to shock cooling.

However, the Blenheim can easily do 150mph on just -2 psi boost and 2300RPM, which would indicate that the extra boost is to be used only in emergency situations.
Wikipedia states 200mph as the cruise speed for the Canadian-built Bolingbroke version of the Mk.IV (which is what our in-game version is modeled after) and i managed to get it to 150mph with very conservative power values,without knowing the proper power settings and while loaded with 90% fuel and four 250lb bombs, so it seems that it's not exactly short of power. I guess if we knew the operating limits for the engines we could do even better.

As for why it keeps turning in the cross-country mission, it could be that this mission has wind on the airfield. Taildragger aircraft always want to turn into the into the wind if left unattended, so it might be a factor?