Just wondering what the preferred running speed of a D3 should be. Lately we've been running the engine at around three thousand revs, but with the throttle pushed fully forward against the stop, it would give three and a half thousand. This is under load of course. I'm not in favour of running an engine flat out - and especially not doing so continuously.
It is generally reckoned with these motors to ease off ten per cent from 'flat out'. But is this for engines under load, or free running?