New to Me Duffy 31

Ebornstein

Lieutenant
Joined
Feb 9, 2012
Posts
36
Likes
1
Just wanted to say thanks for the input I received when I started looking for a DE. I ended up with a 1998 Duffy 31 finished by Atlantic Boat. It has been in the Great Lakes since new and is in great shape. She is powered by a 200hp TAMD 41PA with about 738 hours on it. She cruises at 15 knots at 3500 rpm.

Delivered her from Travis City, Michigan to Cleveland (about 500 miles ) on her own bottom with out a hitch.

Now the projects begin so I will be asking a bunch of questions.

Port.jpg

photo.jpg

Helm.jpg
 

steveinak

Admiral
Joined
Sep 1, 2011
Posts
5,535
Likes
3,246
Location
Piker Central
Boat Make
31 BHM
Nice looking rig, good luck with it. I sure hope you don't plan on running that 41 at the 3500 cruise speed? It won't run long at those rpm's. If you can stick a pyrometer on the engine it will open your eyes to how hard those little engines run when under load. What are you getting for WOT rpm's?
 

El Mar

Admiral
Lite User
Joined
Sep 1, 2011
Posts
7,324
Likes
3,192
Location
Westbrook, CT (The Asshole State)
First Name
Bryan
Boat Make
43 Tiara Open DDEC, GradyWhite 226, 18 Donzi Classic, 15 Boston Whaler Sport ETec 60

WoundUpMarine

Admiral
Lite User
Joined
Jan 1, 2012
Posts
5,810
Likes
4,339
Location
Boothbay, Me
First Name
John
Boat Make
26' Duffy, 23' Seaway, 14' Holland

Ebornstein

Lieutenant
Joined
Feb 9, 2012
Posts
36
Likes
1
steveinak,
I was wondering about that. WOT is about 3850 rpm. The manual said to run 200rpm below WOT so 3500 is about right if you follow the manual. However I thought you were suppose to run them at 15% to 20% off of WOT.

Eric
 

steveinak

Admiral
Joined
Sep 1, 2011
Posts
5,535
Likes
3,246
Location
Piker Central
Boat Make
31 BHM
steveinak,
I was wondering about that. WOT is about 3850 rpm. The manual said to run 200rpm below WOT so 3500 is about right if you follow the manual. However I thought you were suppose to run them at 15% to 20% off of WOT.

Eric

Run it at 35 and you'll be headed right to the rebuild shop in a short time. The 41p in my bowpicker ran 3900 WOT and i ran it at 3250-3300 for cruise speed (aprox 17-18knots) when light, no fish in the boat and 100 or less gallons of fuel, i sold the boat last year with 5200 hours on the meter and it still ran like new. The boat was 28'x11'. Those engines don't like to be run hot or overheated so keep a good eye on the raw water pump i changed impellers every year. You might want to think about a racor crankvent to get rid of that tiny hose going from the valve cover to the turbo. I used all WIX filters instead of expensive volvo parts, also had a K&N air filter.
DEC engine.jpg

DEC racor crankvent.jpg

DECeption running.jpg

DEC engine.jpg

DEC racor crankvent.jpg

DECeption running.jpg
 
Last edited:

MDI45

Vice Admiral
Joined
Sep 1, 2011
Posts
3,648
Likes
1,096
Location
Freeport , new york
Boat Make
45MDI /28WB
Ebornstein,first i would like to say congratulations...nice boat and second listen to what steve said....i had a friend that had the same motor in a H&H and he found that 3100 rpm was best...and never had any problems
 

Eastporter

Vice Admiral
Joined
Sep 1, 2011
Posts
3,959
Likes
1,408
Location
MA
Boat Make
Sold- 20' Eastporter (Rebuilt 2011) 22' Pearson Ensign
Gorgeous and clean boat! It must have been on Lake Michigan all her life. I've been to Traverse City, MI and it is a beautiful location. Have fun with your new boat.
 

Ebornstein

Lieutenant
Joined
Feb 9, 2012
Posts
36
Likes
1
Thanks for the good wishes and comments. I will keep you posted of upgrades. First step is electronics and music. On my last boat I had Simrad NSE which I liked a lot but Raymarine and Fruno have put out some really good gear recently, so I will have to take a look at all of it.
 

Ditchdigger

Captain
Joined
Feb 19, 2012
Posts
992
Likes
645
31

Nice Find ! Lots of luck with her. Have a Volvo TAMD 60 in my 32' 1982 BHM. Original engine still runs great.
 

andy65

Commander
Joined
Feb 11, 2012
Posts
343
Likes
279
First Name
Andy
Boat Make
Northern Bay 36
I've had that picture of that boat on my fridge for a year. Sets a nice goal. Yes. I like it. Congrats
 

Ebornstein

Lieutenant
Joined
Feb 9, 2012
Posts
36
Likes
1
Thanks for the congratulations and advice on the Volvo cruise RPM seems like everyone agrees that that 3500 is too fast.

i am really liking the boat, had her out in short lake erie 4-6 footers (it has been blowing for 3 days between 15 and 30knots) and she took it well. I started by going at it at about 6 knots but found she actually handled it better at 12kts or so. I thought she was going to be a handful in a following sea but that was not the case.

Any running advice would be greatly appreciated though as I have very little operating time on DE hulls.

in the near term i want to add a windlass, new electronics and rod holders.

Any preferences on windlasses? I am looking at the Good rope/chainand the lewmar pro fish.

Thanks to everyone for the support.
 

Ebornstein

Lieutenant
Joined
Feb 9, 2012
Posts
36
Likes
1
Robert M,
Great looking Duffy! I bet she really moves with that Cummins. I would have to say if there is one thing I would change would be a little more in the hp department. I am running a 200hp Volvo which is a great solid engine but a little slow. Maybe when it is time to rebuild I will repower.

Do you have any water pooling problems in the cockpit? After it rains or I wash mine a get some standing water in the starboard aftt corner. When I asked AB about it, they said they were build a little bow heavy as there is often a a lot a weight in the stern when they are being fished. I may have to put a little ballast in the rear. I noticed you had a pretty good size platform on the rear which probably balances her out a little better.

What kind of windlass are you using and could you take a picture of the setup up front?

I would also love a close up of the helm. It looks like there is a door under the helm. Are there electronics up against the head bulkhead?

Thanks
Eric
 

8943post

Commander
Joined
Oct 28, 2011
Posts
301
Likes
58
Location
Warren MA/Cuttyhunk
Boat Make
33 Duffy
Eborstein. Congrats on the new Duffy...we just had AB build a 33 for us, the build is on this forum and noreast.com if you want to see the details.

Great boats, our 33 is barebones...without any comforts except a head. Let me know if you have any questions or need a contact at AB, I'll halp as I can.

Jessie-Lin
 
Top Bottom