I have a pair of 1998 115 FICHT OceanRunners that run great.<br /><br />In summer, with water temp of the ocean at ~89 degrees, the engines run at ~190+ degrees at 5000 RPM which seems high.<br /><br />Last week the water cooled off to 77 and they ran at ~160 to 165 (normal to me).<br /><br />Water pressure is good at 30+ PSI at WOT and 7 PSI at idle.<br /><br />As I understand it, the thermostats come off the seats with the water pressure and are essentially "wide open" when running at 4000 RPM plus.<br /><br />Is it just the fact that the ambient water is so warm that the engines do not cool as well since there is no conventional thermostat to regulate water flow which has excess capacity as in an inboard?<br /><br />I have replaced both stats in one engine with no change and the temperatures are confirmed with the diagnostic software which uses a different sender than the gauges, all of which are in agreement and spot-on. Is this just OMC engineering?<br /><br />Thanks.
