Troubadour
Veteran Member
Help!!!!
Gentlemen,
Newbie Trawler guy here..... we have a purchase agreement for a 42' 1986 CHB Sundeck Trawler. Surveys and sea trial were performed yesterday. Main survey came back fairly clean....typical stuff for an older boat. The engine survey (twin Perkins 6354T's 200HP turning 27x22 props) came back fairly clean also except for props need replacing due to Galvanic Corrosion. PO has replaced combo heat exchangers and exhaust systems. The "fly in the ointment" is that the engines at FT will not spin up to the rated 2800rpms. They would only muster 1800 (both engines). The mechanic (which came highly recommended by multiple sources) suggests the props are causing the lugging and that replacement with the correct size prop would bring the rpms back into spec. He advised that some owners feel that by increasing the size of the prop and running at lower rpm's one would see an increase in fuel efficiency. He says this is a fallacy and that lugging the engines will actually increase fuel consumption and could cause damage to the engines in the long run. What would be your recommendations? Sounds like a lot of rpms to gain off just changing props. I'm a lifelong blowboater trying to convert to a Trawler so my knowledge of large systems like this is limited. Thanks
Gentlemen,
Newbie Trawler guy here..... we have a purchase agreement for a 42' 1986 CHB Sundeck Trawler. Surveys and sea trial were performed yesterday. Main survey came back fairly clean....typical stuff for an older boat. The engine survey (twin Perkins 6354T's 200HP turning 27x22 props) came back fairly clean also except for props need replacing due to Galvanic Corrosion. PO has replaced combo heat exchangers and exhaust systems. The "fly in the ointment" is that the engines at FT will not spin up to the rated 2800rpms. They would only muster 1800 (both engines). The mechanic (which came highly recommended by multiple sources) suggests the props are causing the lugging and that replacement with the correct size prop would bring the rpms back into spec. He advised that some owners feel that by increasing the size of the prop and running at lower rpm's one would see an increase in fuel efficiency. He says this is a fallacy and that lugging the engines will actually increase fuel consumption and could cause damage to the engines in the long run. What would be your recommendations? Sounds like a lot of rpms to gain off just changing props. I'm a lifelong blowboater trying to convert to a Trawler so my knowledge of large systems like this is limited. Thanks
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