45 with 671TI

[Hookedup2407]

Recently found a 1969 45 Hat convertible for sale. Owner gutted the interior and repowered it 10yrs ago with these 671TI 450hp. Strange, I’ve never seen a 45 powered with 671s. Can anyone give me an estimate on cruise speed and top end? Last Hatteras i had was a 46’ with 8.3L Cummins 6CTA 450hp so i would assume it would be similar? 22kt WOT.. any downsides with the 671s in it? Engines have 1500hrs on the and it was a liveaboard for some time.. I’m going to see it on Sunday. Hopefully this could be a good option for me.. thanks

 

[Captain Ralph]

Any sales web ad with pictures?

 

[Hookedup2407]

Any sales web ad with pictures?

Unfortunately no pics as of yet.. just an add i found

 

[jim rosenthal]

6-71s weigh a bit more than C series Cummins, so you might lose a bit there. Also, 6-71s wound up to 450hp are working pretty hard.

The first 45C was a handsome boat but they are all pretty old, now. Look carefully for rot etc in the aft bulkhead. Later Hatteras 45 and 46 models had less exterior wood in them, I'm fairly sure.

Bottom line, or at least what I would suspect: this boat would have to be very inexpensive, I think. It will not be particularly fast, for one thing.

A yacht broker once told me, "whenever you buy a boat, think about the next owner after you." It was very good advice. An old boat with obsolete engines which weren't (as far as I know) offered in that model will be difficult to resell when you are done with it. Just my two cents.

 

[Sonic Boom]

Here's a few thoughts on the subject:

Our 46 series 1 which is very similar to the 45 series 1 would cruise 16 knots at 2000 rpm and WOT 19 knots with 8v71 naturals at 320 HP. We did removed an estimated 1000 pounds from the boat to achieve this.

There was a late 60's 45' Charter boat with 500hp Luggers that would cruise in the low 20's with a gutted interior. The interior down below was basically a freezer and a bench.

Would be curious what you find

 

[Hookedup2407]

6-71s weigh a bit more than C series Cummins, so you might lose a bit there. Also, 6-71s wound up to 450hp are working pretty hard. The first 45C was a handsome boat but they are all pretty old, now. Look carefully for rot etc in the aft bulkhead. Later Hatteras 45 and 46 models had less exterior wood in them, I'm fairly sure. Bottom line, or at least what I would suspect: this boat would have to be very inexpensive, I think. It will not be particularly fast, for one thing. A yacht broker once told me, "whenever you buy a boat, think about the next owner after you." It was very good advice. An old boat with obsolete engines which weren't (as far as I know) offered in that model will be difficult to resell when you are done with it. Just my two cents.

Yes, inexpensive as I’m not a wealthy man. But (from what few pics I’ve seen) the boat is immaculate. Gutted and redone 10yrs ago. I’m excited to see it this weekend. I run charters and looking for my first personal boat as I’m tired of working for other people. One thing I’ve learned in life is i not to rely on others.. period. As for speed, i really don’t need it. I fish within a few miles of shore. Only time i really need power is over the bar and through the inlet. I putt around the rest of the time so i wont be using all the ponies much. Just nice to have the power to get in safely.. Currently running a 1973 53’ with 1271 naturals and she’s a slow pig.. great platform but a bit too much boat for my needs. 671s sound a lot more affordable overall. I do like my Detroits, they’ve grown on me over the years. 671s with 1 head, 1 exhaust manifold, 6 cylinders, all sound much more realistic when it comes to cost of ownership.. (vs 1271s) I’ve just never seen a 45 with 671s before. 871s and 692s is all ive seen.. I absolutely love these old boats. Nothing today is built like a 1970s Hatteras.. Nothing. Your right about the weight difference.. i remember the exhausts would only get 1/2 way submerged on the 46 with the Cummins topped off on fuel and water.

 

[jim rosenthal]

I'd be interested to know what you find out when you look her over.

6-71s are one of the best engines DD ever built. They are old, but I think you can still get parts for them, and if you can work on them yourself, so much the better.

Post photos, if you can get some.

 

[johnjen50]

Friend of mine had an either 84 or 85 45 C with the 671tis from the factory. He bought it new. We cruis3d back from Martha’s Vineyard one day in short spaced 6 footers across Buzzards Bay and that boat sat down and did a comfortable 15knts the whole way. I know he usually cruised it at 18knts but don’t know what the wide open was. That was a great sea boat. Not sure of the differenc3s between the 69 and eighties boats but that one was a sea horse!

 

[johnjen50]

Hey just did a quick search and realized my friends 45 did not go to Miami, that was another friend of ours. That boats name was Tarfu, but the thread is under the name Tiburon. Search that as it’s a pretty good read. Everything else I said is accurate regarding engines and speeds. Funny, these two guys are some of the nicest guys in the world and they would fish the giant tunas off Glochester and Stellwagen Banks and sell granders to the Japanese trawlers off shore for big money. My friend said that’s how he paid for the 45!

 

[Hookedup2407]

Hey just did a quick search and realized my friends 45 did not go to Miami, that was another friend of ours. That boats name was Tarfu, but the thread is under the name Tiburon. Search that as it’s a pretty good read. Everything else I said is accurate regarding engines and speeds. Funny, these two guys are some of the nicest guys in the world and they would fish the giant tunas off Glochester and Stellwagen Banks and sell granders to the Japanese trawlers off shore for big money. My friend said that’s how he paid for the 45!

Interesting.. thanks for the info

 

[Hookedup2407]

I'd be interested to know what you find out when you look her over. 6-71s are one of the best engines DD ever built. They are old, but I think you can still get parts for them, and if you can work on them yourself, so much the better. Post photos, if you can get some.

Will do thanks

 

[Capt Chad]

I love 6-71s and I made a living with them for many years. But as a 46c owner with 8-71TIs I just don't see 6-71 turbo motors lasting very long pushing a 42,000 (dry) pound 46. They did a good job in the 48 Oceans but they were roughly 10,000 lighter.

 

[SKYCHENEY]

I love 6-71s and I made a living with them for many years. But as a 46c owner with 8-71TIs I just don't see 6-71 turbo motors lasting very long pushing a 42,000 (dry) pound 46. They did a good job in the 48 Oceans but they were roughly 10,000 lighter.

Hatteras put them in a 43DC and that boat is of similar weight

 

[rsmith]

45 with 6’71ti is seriously underpowered consider with 8/71 naturals it was a 16kt boat on a good day 8/71 TI would give you 18-20 kt cruise depending on fuel quantity on board.

 

[Hookedup2407]

I love 6-71s and I made a living with them for many years. But as a 46c owner with 8-71TIs I just don't see 6-71 turbo motors lasting very long pushing a 42,000 (dry) pound 46. They did a good job in the 48 Oceans but they were roughly 10,000 lighter.

Good point! Went and saw the boat.. interior is very nice since it’s been recently redone. However the engine room and engines weren’t upto snuff.. just a lot of rust on the engines and transmissions, Giant exhausts on the transom 12” i think.. same size that’s on the 53’ with 1271TI that i run from time to time. I didn’t start it up but I’d imagine it’s extremely loud with 12” outlets.. boat just wasn’t set up right.

 

[rsmith]

32,000 for the 45 the 46 is about another 1900lbs but not 10k

I love 6-71s and I made a living with them for many years. But as a 46c owner with 8-71TIs I just don't see 6-71 turbo motors lasting very long pushing a 42,000 (dry) pound 46. They did a good job in the 48 Oceans but they were roughly 10,000 lighter.

 

[Dj41c]

71 series is the best of the Detroits. I would pass on anything with a 92 series, Dry sleeve vs wet sleeve. The main bearings are about twice the size in the 71's, another weak area for 92s.

 

[SKYCHENEY]

71 series is the best of the Detroits. I would pass on anything with a 92 series, Dry sleeve vs wet sleeve. The main bearings are about twice the size in the 71's, another weak area for 92s.

It all depends on how and if they are run and how well they are maintained. We've owned many of both in boats, construction equipment, trucks, and other applications. The last set of 92's in my boat were pulled out at over 5000hrs for the repower. When new or off of a fresh proper rebuild, I would prefer the 71 as well. Used? Its all about how they were used and cared for. Blanket statements disparaging 92s is not a fair assessment and usually comes from those who had a bad experience or are just repeating "dock talk".

 

[Dj41c]

It all depends on how and if they are run and how well they are maintained. We've owned many of both in boats, construction equipment, trucks, and other applications. The last set of 92's in my boat were pulled out at over 5000hrs for the repower. When new or off of a fresh proper rebuild, I would prefer the 71 as well. Used? Its all about how they were used and cared for. Blanket statements disparaging 92s is not a fair assessment and usually comes from those who had a bad experience or are just repeating "dock talk".

"Disparaging" 92's only when compared to 71's. Don't take it personally, 92's are fine, some people go 5000 hours with them. "Dock talk" how many people do you think have actually seen a 71 main bearing next to a 92 series on the dock? They are good engines, I just like 71's more.

 

[SKYCHENEY]

I don't take it personally at all. Just pointing out that they are both great engines. Its just that 71's can be subject to neglect and poor maintenance and handle it for longer than a 92. Most who have problems are those who do not keep up with the maintenance.

How many main bearing failures have you seen? I don't remember any. And we rebuilt Detroits in our shop every year. As I remember it, all of the main bearings were the same.

Another point to consider is that most of the buyers/owners for these boats with Detroits are accumulating less than 100hrs/year. So those owners really don't have to worry about overall longevity because they'll never own the boat long enough to see any difference.