Also running hot
Situation:
· Universal M18 Diesel, 14HP
· Campbell Sailor 3 blade 13RH P7- calculators say this is correct prop size for boat/engine configuration (VicProp shows 12.8/7.5 for a 3 blade).
· All new cooling/exhaust system hoses and exhaust elbow
· Oversized aftermarket heat exchanger, boiled clean 1 year ago
· Oberdorfer water pump is moving water through the system just fine
· Water Temperature 80 degrees F (freshwater)
· Tachometer accuracy verified with handheld tach
· Cruising RPM 2200 temperature stays around 180
· Max RPM achievable under power 2600 (should be 3200) and engine temp climbs to 200+ No black smoke.
Is the boat overpropped? The calculators say this is the correct prop. The bottom is not entirely clean, but I never could get over about 2600 even when fresh. An incorrect prop is the only reason I can think why the engine will not reach rated RPM and starts to overheat. Unless I am missing something? What do other 30+ owners with the M18 or similar engines have for a prop?
Thanks
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