The 7.1 cat is too small. Not enough mass to get a good life out of them.
Keep in mind the old engine was over 9 liters and heavy duty. That's why they lasted.
QSM 11 would be far better. Or talk to Sky Cheney. He's doing it right now with cats. He's putting in 8.7 liter engines.
Welcome to the Hatteras Owners Forum & Gallery. Sign Up or Login
+ Reply to Thread
Results 11 to 20 of 51
Thread: 53MY Repower
-
11-10-2021 05:57 PM #11
Re: 53MY Repower
Scott
41C117 "Hattatude"
Port Canaveral Florida.
Marine Electronics and Electrical Products Distributor.
-
11-10-2021 07:07 PM #12
Re: 53MY Repower
when my boat was repowered the PO left the 32 volt stuff in place and put an 8d in each engine room, 1 for each engine. they also had a 12v battery to run 2 heads and a 12v battery for the generator. i have since swapped everything over to 12 volt
Mis b' havin
1972 58 yachtfish
58yf352
pass christian, ms.
-
Re: 53MY Repower
Last edited by SKYCHENEY; 11-10-2021 at 10:27 PM.
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
-
Re: 53MY Repower
Just for grins I ran the re-power duration numbers through the old project management estimator, "PERT". Its old but works, plus has statistical analysis capabilities. I will skip all the wild PM PERT stuff, which requires full coursework.
What I used, in months, per the conversations here:
Optimistic 2 Mos
Likely 9 mos
Pessimistic 24 mos
PERT tool sez [ Optimistic + (4 x Likely) + Pessimistic ]/6 = [ 2 + (4 x 9) + 24 ]/6 = 62/6= 10.3 mos Probably duration.
It would be fun to know how close the tool is to actual experience.
Long time PM guy... Note: Per the remarks as well, you need one or more "stars" on your projects, i.e. people who really know their stuff!50 Years on the Great Lakes...
-
Re: 53MY Repower
There is a 53' my in our cruising club which was repowered w C series Cummins. Performance numbers about like Pascal's and has run nicely for years. I'd look at those. I don't know which Cats are the 7.1s, but if they are related to 3126s I'd avoid them/
-
11-11-2021 08:22 AM #16
Re: 53MY Repower
My friday "Dream proyect" is to repower my 58 YF . I am considering the Scania 6 cil 500 hp engines. My plan is to leave all the 32 V systems intact and add a 12v system for the engines only. The problem with a proyect of this size is the "Since" word. That is what takes the cost trough the roof.
-
Re: 53MY Repower
Sky, I must have missed something, this is the first I have heard about your repower could you start a thread and keep us posted as to your progress, I think most of us would be interested. John
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
-
Re: 53MY Repower
Agreed. Sky that looks like it’s going to be awesome. All I’m thinking is that’s 200 more horsepower than I have now and how great the boat would perform with the extra ponies. New engine beds I’m sure but what about shafts? You had the 6-92’s before right? What were those, 500 up?
John
1981 58 Yachtfish Hull 477
Wickford RI
-
11-11-2021 09:21 AM #19Senior Member
- Join Date
- Mar 2007
- Posts
- 221
Re: 53MY Repower
Thanks, everybody! Some great inputs here and lots to think about. Keep it coming as you think of any other considerations. As always, this forum rocks!
-
Re: 53MY Repower
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI