I flew many hours in the RAAF Convair 440 Metropolitan's. One of them (A96-313) was not equipped with weather avoidance radar and we experienced occasional problems with Cb penetrations. On at least one occasion the cylinder heads temps dropped right back and this was caused by heavy rain. I don't recall servicing problems with cylinders caused by lots of water entering the cowls, although we sure had ignition harness problems. Also significant spark plug fouling caused by 115/145 octane fuel which caused leading up with prolonged ground operation. Couple of impressive start up fires too.