Took the boat out this morning to run her. She's just been doing low speed harbor cruises lately.
Went on a 20NM trip cruising at 2500RPM SOG was 19.8kts used 13gals of gas. All was normal temp, oil pressure 40psi Twin 350cui Crusaders on a 30ft 1966 Californian express cruiser. When I entered the harbor I dropped the speed to 700RPM to achieve the 5mph speed in the harbor. I noticed the oil pressure dropped to 20psi after about 5min the starboard engine rose back to 40psi. The port engine took about another 15 min to get up to 40psi. Never seen this happen before. 40psi is the normal operating range on these engines. Any thoughts. Oil change is due. Viscosity breakdown due to running her a litte hard? Oil levels are full.
Went on a 20NM trip cruising at 2500RPM SOG was 19.8kts used 13gals of gas. All was normal temp, oil pressure 40psi Twin 350cui Crusaders on a 30ft 1966 Californian express cruiser. When I entered the harbor I dropped the speed to 700RPM to achieve the 5mph speed in the harbor. I noticed the oil pressure dropped to 20psi after about 5min the starboard engine rose back to 40psi. The port engine took about another 15 min to get up to 40psi. Never seen this happen before. 40psi is the normal operating range on these engines. Any thoughts. Oil change is due. Viscosity breakdown due to running her a litte hard? Oil levels are full.