Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-03-2009, 11:52   #16
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Quote:
Originally Posted by Marinheiro View Post
Interestingly the installer (a Yanmar agent) said the JH series started off as a reverse engineered version of the Perkins 4.107, getting rid of the usual english oil leaks and other niggling problems - anyone confirm this?
Sounds like boat dealer folklore to me. They look nothing the same..
__________________

__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 18-03-2009, 14:02   #17
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,342
Look at the power curves and get the HP you need at a reasonable rpm, unless you like sounding like a biplane!
__________________

__________________
Cheechako is offline   Reply With Quote
Old 18-03-2009, 14:15   #18
Registered User

Join Date: Jan 2009
Location: Kemah tx
Boat: Allmand 31
Posts: 12
The Kubota oil pans were too deep to fit my boat when I repowered. I went with a Yanmar and have been very happy with it. measure the engine area a lot before you buy.
__________________
olgy is offline   Reply With Quote
Old 18-03-2009, 17:01   #19
Registered User

Join Date: Mar 2009
Location: Australia, Central Coast.
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 776
We replaced our Volvo (Green Death) with a Yanmar and are very happy with the choice. Get a 3:1 reduction of you can. Regards, Richard.
__________________
boden36 is offline   Reply With Quote
Old 18-03-2009, 20:18   #20
Registered User
 
redcobra's Avatar

Join Date: Mar 2009
Location: Towson, MD Chesapeake Bay
Boat: Pearson 39 Yawl "ZigZag"
Posts: 516
Cool 3:1

Wouldn't a 3:1 ratio require more rpm's for a given boat speed? The Nanni is rated at 3000rpm for rated HP and the torque curve is at max at 1800prm. Idles at 800 rpm. I thought 2:1 would be recommended.

Thanks to all for your advice. Keep it coming as the decision is looming.

Alan

ps: I intend to get a Martek or MaxProp feathering prop.

pps: A friend of mine said that which ever one I choose, the engine will probably last at least 15 years with no problems and after that I probably won't care as I am very much over 39 now
__________________
redcobra is offline   Reply With Quote
Old 18-03-2009, 20:50   #21
Registered User

Join Date: Nov 2008
Location: Seattle
Boat: Wauquiez Centurion 49
Posts: 720
Images: 13
I repowered from a M60 Perkins to a 4JH4-TE 75hp Yanmar last year. I couldn't be happier.

You should consider the 54hp Yanmar. It will work with your ZF trans.

Yanmar is like the Chevy small block--reliable, and anyone in the world can get parts and work on it.
__________________
CAELESTIS is offline   Reply With Quote
Old 18-03-2009, 22:18   #22
Registered User
 
Mark424's Avatar

Join Date: Sep 2007
Location: Seattle, WA
Boat: Maine Cat 38
Posts: 223
Quote:
Originally Posted by CAELESTIS View Post
You should consider the 54hp Yanmar. It will work with your ZF trans.
I like the concept of Yanmar's inline flywheel generator. YANMAR Diesel Power - Optional Equipment KMG65E

If you've got ~4" of space, it'd be a nice addition to the 39 or 54hp engine.

Now all we need is common rail tech to come to smaller engines. More complexity, but also lots less noise.
__________________
Mark424 is offline   Reply With Quote
Old 19-03-2009, 01:07   #23
Registered User

Join Date: Mar 2009
Location: Australia, Central Coast.
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 776
Alan, with 3:1 you get to swing a slightly larger, slightly coarser prop which spins slower and is more efficient. You play with the prop pitch and size so that at full throttle with a clean hull and prop, the engine can just attain full designed revs. You do not have to rev higher for a given hull speed, in fact your revs for a given speed may be marginally less. Also less wear on prop shaft, seal etc and a little less vibration. Regards, Richard.
__________________
boden36 is offline   Reply With Quote
Old 19-03-2009, 16:58   #24
Registered User

Join Date: May 2008
Location: Belo Horizonte, Brazil
Boat: Farr 46
Posts: 124
Rather than choosing the engine first you should verify what prop you can swing, then look at available engine/reduction gear combinations. You may find with a larger reduction gear you can come down a step in engine size with some saving in $$'s. On my yacht the biggest prop you could fit is about 22" - the ideal theoretical hp was about 70, but then you could only utilise a 2:1 box (& I did not want a turbo motor Yanmar/green mc which were the only options space wise),instead I have 54 hp with a 2.62:1 reduction - would have like slightly larger but was going to cost alot more. Calders Cruising Handbook has a section on how you can make the calculations, or a prop shop can do same
__________________
Marinheiro is offline   Reply With Quote
Old 19-03-2009, 19:08   #25
Registered User

Join Date: Nov 2005
Location: Ohio
Posts: 2,311
We swapped out our W108 with another W108, I figured it would fit. Pretty sure it's a Mitsu block. The one we pulled had 6k and still ran well but I had time, a couple bucks and a Skill Saw. Think there's a pic here somewhere. Good luck and have fun, it's not a bad project.
__________________
Joli is offline   Reply With Quote
Old 20-03-2009, 21:43   #26
Registered User
 
redcobra's Avatar

Join Date: Mar 2009
Location: Towson, MD Chesapeake Bay
Boat: Pearson 39 Yawl "ZigZag"
Posts: 516
Thumbs up Final Decision

Well it seems the decision is that it is to be the 37.5hp Nanni/Kubota.
The Yanmar was only about $800 more, but my boatyard is not a Yanmar dealer (they do represent Nanni and Vetus) and the service and warranty aspect came into play. Idles at 850rpm and cruises at 2800rpm. Am looking into the reduction ratio. Included the 100A Alternator. Scheduled for end of April.
Now the next question is, which 3 blade feathering prop? MaxProp or Martec.

Thanks for all the advice
__________________
redcobra is offline   Reply With Quote
Old 21-03-2009, 05:17   #27
Registered User

Join Date: May 2008
Location: Belo Horizonte, Brazil
Boat: Farr 46
Posts: 124
red cobra, have a look at the forum "FOF vs Kiwi Prop", props you should consider in my view are:
kiwiprop (will be the cheapest)
varifold
FOF
Variprofile
both the Max & Martec (actually Australian Autostream) are old feathering designs and not very efficient compared with the above (Kiwi prop probably about the same efficiency)
__________________
Marinheiro is offline   Reply With Quote
Old 25-03-2009, 18:40   #28
Registered User
 
redcobra's Avatar

Join Date: Mar 2009
Location: Towson, MD Chesapeake Bay
Boat: Pearson 39 Yawl "ZigZag"
Posts: 516
After a lot of conversation with the US Nanni Distributor who have been very helpful, it has been determined that I can't swing a prop big enough for a 3:1 reduction ratio. The recommendation is for a 2:1 reduction and a 17x11 3 bladed fixed prop or a 16x11 3 bladed feathering prop.
__________________
redcobra is offline   Reply With Quote
Old 11-04-2009, 18:26   #29
Registered User

Join Date: Nov 2008
Location: Hampton, VA
Boat: 45'=not anymore
Posts: 326
Send a message via Skype™ to xxuxx
YANMAR.....................FOR PARTS AVAILABILITY AND SERVICEABILITY ON THE EAST COAST
__________________
xxuxx is offline   Reply With Quote
Old 12-04-2009, 20:27   #30
Senior Cruiser
 
Opie91's Avatar

Join Date: Apr 2009
Location: CT
Boat: C&C 34
Posts: 810
Take a good look at Beta

I repowered 5 years ago with a beta and love it. Great price and all parts are easily available.

One other thing to consider is the British Pound has been getting beat up pretty bad lately, the Beta comes from England, and thus they are willing to make better deals on them. (Have seen this within the last month)
__________________

__________________
Opie91 is offline   Reply With Quote
Reply

Tags
engine

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Boat Choice biltong Monohull Sailboats 3 25-11-2009 05:28
Help with Boat Choice mparent Monohull Sailboats 13 10-07-2009 02:36
Choice of VHF sparty Product or Service Reviews & Evaluations 18 06-05-2009 04:40
Inverter choice caribnsol Electrical: Batteries, Generators & Solar 30 28-04-2008 14:47
Help with a choice 40North Monohull Sailboats 10 27-09-2007 07:35



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:55.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.