12V71TI used on a lot of different Hatteras models

[Byresch]

I've seen them on 70 footers, 63 footers, and a lot of other models. While I have seen a lot of discussion about replacement for the 8 cylinder Detroits I have not seen much for this model. I was wondering if you were to replace them on your boat what would be your engine of choice and why?

 

[SKYCHENEY]

There are many choices in that 6-900 HP range now. Cummins, Cat, Volvo, Man. All are 6 cylinder and much smaller and lighter weight.

But none sound as sweet as a 12v71.

 

[Bayside Bert54]

The Cat C-18 can be a desirable choice to replace a 12V71TI but the value equation is a big loser in a 54' range.

 

[rustybucket]

You can repower with c-18 remans for very close to the same price as rebuilding the 71's (or 92's) for that matter. I see reman c-18's in the $50k/ea range quite often. You would need to add a $15k/ea gear to them and of course other stuff as well like 32v-24v conversion, engine bed...etc

 

[edward]

Do you know of anyone that have repowered/refit a motor yacht that has 12v71 with CAT reman C18s ? Any performance numbers? Regards, Edward

 

[jmooney]

I have seen a 70 Hatteras that had the 12-V71 s replaced with Detroit Series 60 s . No one seems to talk about those motors very much , but I don’t hear bad things either. ( That might change quickly) The boat was unusual as it had walk around decks . I discussed the work on the boat with the man who changed the engines . This was done through the galley sole and fly bridge. An absolutely big job . A sport fish would be far easier. I could never bring myself to cut big holes in the hull. So I think rebuilding 12-V71s would be about a third of the cost of re- engining a motor yacht.

 

[Briankinley2004]

Here is the comparison once again

 

[SKYCHENEY]

Series 60 is an absolute awesome engine. They were never used much in marine applications, but truckers love them.

 

[rustybucket]

Anybody happen to know approx how long a c18 is with gear?