Northern Spy
Guru
- Joined
- Feb 5, 2012
- Messages
- 4,092
- Location
- Canada
- Vessel Name
- Northern Spy
- Vessel Make
- Nordic Tug 26
Did you get the spreadsheet?
Eric.Willard powered the W30 (see avatar) w a 107 cu in engine and over propped it so instead of having 36hp on hand there was only about 33. Even w 33hp the 8 ton W30 is slightly over powered so IMO any deviation from 107 cu in should be down rather than up. Two liters is too big of an engine but the Kubota's are wonderful engines .. no doubt about it.
When I repowered my Willard I was faced w the choice of (after narrowing down) the 107 cu in Mitsubishi or the 113 cu in Isuzu. My favorite was the 54hp Isuzu but was just too much power. Haven't been sorry I choose the 107 Mitsu. It's only about 10% overpowered .. and that seems a very good place to be.
gadenors is the 38hp Nanni a Kabota and is it 1.5 liter? That would seem perfect IMO. A three or a four cyl engine?
AusCan I just checked back and see Kokanee is a ton less than the W30 so even 30hp should be plenty of power. I was afraid to go smaller and understand the situation but in the end for me I could have. If you want to go a bit smaller than the 107 Mitsu they (Mitsubishi) does make a shorter stroke version of the .... I just checked the web site and it looks to not be there. However that's in N America so elsewhere it probably still is. I saw the smaller engine on the Vetus catalog .. but that was about 8 years ago. A stone to possibly overturn though.
The only variable yet unturned yet (I think) is the drag of the hull. If the hull drag is higher than the W30 then perhaps 34hp would be better. The Willard is only average drag for her type .. IMO.
Leper reduction than 2.6-1. Big propellers have their problems and smaller props are more flexible re power loading v/s speed.
Did you get the spreadsheet?
4 and 6BY Yanmars are BMW car blocks. 6LP are Toyota. 8LV also Toyota. 6SY and 8SY are Scania. The rest of Yanmar's line I think are all built directly by Yanmar.
When the smog regulations went into effect in 2007(?), Yanmar contracted out to these vendors for engines in the 100-300hp range. I was under the impression that it was a transient thing until Yanmar could get their production line up and running to produce that range of engine. I could be way off....
Steve, congratulations, the new powerplant sounds a good choice. You really are dictated to by the deep pit which serves as the ER. I helped a friend R&R the engine in a Resort 35,tight as, building and installing a mock-up was a good idea. We spent hours bent over shimming the engine mounts.
You know it Bruce.
I am am currently luxuriating in the sit-up engine room with no engine.
Before the new engine is installed, I need to:
- Finish cleaning & painting bilge
- Replace the fuel tanks, filters, and lines,
- Install engine mount beds,
- Relocate battery boxes
- Rewire for new engine, ER lights, and bilge pumps
I am hoping that with the newer smaller engine, and the relocated batteries, exhaust & fuel tanks; if I play my cards right, I may just be able to sit down aft of the engine after it is installed; rather than working upside down.
Pictures of the project please sir