terry_thatcher
Terence Thatcher
My 382 has a Perkins 4-108. I am contemplating a repower. Things are beginning to break, altho it always starts and mostly runs well.
The Perkins is probably more hp than the boat needs, at least according to Ted Brewer's book on yacht design. For those of you that still have the Yanmar 33, which appears to fit Ted's advice on engine size, some questions:
1. What is your cruising rpm and cruising speed?
2. What is your fuel usage at cruise?
3,. What is the Yanmar 33's design top rpm and what is the actual top rpm on your engine?
4. What is your prop diameter and pitch?
The Beta 43 has similar but higher performance than the 4-108. It appears to me that the Beta 35 would be enough power for the boat and would burn significantly less fuel than a Beta 43. On the other hand, those 382 owners who installed the Beta 38 (a higher revving engine) discovered that the 38's lift pump could not bring the fuel out of a Morqan 382/3 tank. One installed a day tank, at additional expense, and one relies on an electric lift pump. Maybe the 35 would have a similar problem.
I am trying to make a wise choice, so I am seeking more information. And to Mark Pearson: I have not eliminated a Yanmar 45 from consideration. It is on my list of options. But given my old fart problems using my damn cell phone, I hesitate to have a computer-driven diesel on my boat.
Thanks to all who can give me answers and advice.
The Perkins is probably more hp than the boat needs, at least according to Ted Brewer's book on yacht design. For those of you that still have the Yanmar 33, which appears to fit Ted's advice on engine size, some questions:
1. What is your cruising rpm and cruising speed?
2. What is your fuel usage at cruise?
3,. What is the Yanmar 33's design top rpm and what is the actual top rpm on your engine?
4. What is your prop diameter and pitch?
The Beta 43 has similar but higher performance than the 4-108. It appears to me that the Beta 35 would be enough power for the boat and would burn significantly less fuel than a Beta 43. On the other hand, those 382 owners who installed the Beta 38 (a higher revving engine) discovered that the 38's lift pump could not bring the fuel out of a Morqan 382/3 tank. One installed a day tank, at additional expense, and one relies on an electric lift pump. Maybe the 35 would have a similar problem.
I am trying to make a wise choice, so I am seeking more information. And to Mark Pearson: I have not eliminated a Yanmar 45 from consideration. It is on my list of options. But given my old fart problems using my damn cell phone, I hesitate to have a computer-driven diesel on my boat.
Thanks to all who can give me answers and advice.