34 Hatteras restore

[Daniel]

What's the max power that has been put in a 34? Are the trunk cabin and the later version the same hull? I see all these Carolina boats and Cabos 33' 35' or so with up to 500hp. Geez. I am not planning this but I am curious, why don't I see more hot rod 34s. I see the 5.9 goes up to 480hp.

 

[SKYCHENEY]

RE: Concrete blocks

I was in the business of manufacturing concrete blocks for many years. The most common mistake is people putting them on their side when blocking. They are manufactured so that the cores go vertical. The compressive strength is tested that way and only that way. If you put them on their side, they are worthless.

 

[drburke]

Daniel, there are lots of folks who have re-powered 34's on the forum, but I think 370 hp may be the highest number I have seen--others can chime in.

They are the same hull. There is a book on the naval architect used by Hatteras for most of their corporate life, Jack Hargrave. It details the history of the company, and the 34 hull was the second produced after the 41, and the first where they tank tested it for speed and efficiency--the book noted a test run of 40 mph on gas engines. The trunk cabin was replaced by a flatter one in a style move, but had more headroom; the hull remained the same for all production years.

I still have a soft spot for my old 34'

DAN

 

[Boatsb]

You Shooting For 50 kts?

That's a lot of power for a 34. No way the 1.5 shafts would work with them.

FYI you can hit 30 kts with a nicely set up pair of 370b's if the boats not too heavily loaded. 370's will push it for a nice 25 kt cruise by my figures. My buddies 3rd fully rigged and loaded cruises 22+ kts with 315's

 

[Daniel]

Daniel, there are lots of folks who have re-powered 34's on the forum, but I think 370 hp may be the highest number I have seen--others can chime in.

They are the same hull. There is a book on the naval architect used by Hatteras for most of their corporate life, Jack Hargrave. It details the history of the company, and the 34 hull was the second produced after the 41, and the first where they tank tested it for speed and efficiency--the book noted a test run of 40 mph on gas engines. The trunk cabin was replaced by a flatter one in a style move, but had more headroom; the hull remained the same for all production years.

I still have a soft spot for my old 34'

DAN

I couldn't afford to do it but seems like a set of the qsb 5.9 480hp would be awesome in this boat or the 36c.

 

[Daniel]

You Shooting For 50 kts?

That's a lot of power for a 34. No way the 1.5 shafts would work with them.

FYI you can hit 30 kts with a nicely set up pair of 370b's if the boats not too heavily loaded. 370's will push it for a nice 25 kt cruise by my figures. My buddies 3rd fully rigged and loaded cruises 22+ kts with 315's

The 370 are what I'll be going with. Because that's all I can afford to purchase and run. If I had the money I would put in the 480 definitely. I just wish someone had them in so I could talk smack to my cc buddies that cruise and 35 knots. 40 knots would be insane to me. I'm just bored while kids watch cartoons.

 

[Daniel]

You Shooting For 50 kts?

That's a lot of power for a 34. No way the 1.5 shafts would work with them.

FYI you can hit 30 kts with a nicely set up pair of 370b's if the boats not too heavily loaded. 370's will push it for a nice 25 kt cruise by my figures. My buddies 3rd fully rigged and loaded cruises 22+ kts with 315's

The little 440s rang the shafts that was in it into. There new. But I'll have to go bigger when repower.

 

[34Hatt]

RE: Concrete blocks

I was in the business of manufacturing concrete blocks for many years. The most common mistake is people putting them on their side when blocking. They are manufactured so that the cores go vertical. The compressive strength is tested that way and only that way. If you put them on their side, they are worthless.

I was placing them correctly and they still cracked.......

 

[SKYCHENEY]

I was placing them correctly and they still cracked.......

To get the most out of them, you also need to spread the load. Ideally, the bottom needs to sit on a flat surface and there should be a board on top. There is also a top and bottom to them. The side wall is thinner at the bottom.

 

[34Hatt]

To get the most out of them, you also need to spread the load. Ideally, the bottom needs to sit on a flat surface and there should be a board on top. There is also a top and bottom to them. The side wall is thinner at the bottom.

3/4" plywood on ground then the blocks Placed correctly and always cribbing between the block and keel
I get pulled by a trailer so when you block the keel to pull the trailer out there is some rocking and a LOT of weight on them that's when they crack! My 6" Aluminum I beam bolted together doesn't have that problem!

Figured if you made them you would have mention they are not all the Same some blocks are way better than others.

 

[madhatter1]

1966 34C 270 Cummins. 27 MPH cruise at 2400 RPM @ 1.25 SMPG
Wide open is 2600 which is 30-31 MPH
Had them since 98 so numbers are accurate (clean bottom and running gear)

This does not mean a 330 will cruise at 30 MPH as they are propped different for the higher RPM 330 (2800) and 370 (3000). According to fuel flow charts from Cummins (which are very accurate, at least on mine) the 330 will have slightly better fuel economy overall.

Also boat performs same full of fuel as it does running light so I top off at around every 100 miles.

Trim tabs are only required to level boat. trying to push front down only results in lower speeds. Only other time I use them is sometimes to nose down in choppy water to make ride a little smoother.

Whatever you choose, be fanatical about a clean bottom, especially shafts and most of all prop blades. I recently found the best diver I have ever had and it makes a huge difference.

 

[Daniel]

1966 34C 270 Cummins. 27 MPH cruise at 2400 RPM @ 1.25 SMPG
Wide open is 2600 which is 30-31 MPH
Had them since 98 so numbers are accurate (clean bottom and running gear)

This does not mean a 330 will cruise at 30 MPH as they are propped different for the higher RPM 330 (2800) and 370 (3000). According to fuel flow charts from Cummins (which are very accurate, at least on mine) the 330 will have slightly better fuel economy overall.

Also boat performs same full of fuel as it does running light so I top off at around every 100 miles.

Trim tabs are only required to level boat. trying to push front down only results in lower speeds. Only other time I use them is sometimes to nose down in choppy water to make ride a little smoother.

Whatever you choose, be fanatical about a clean bottom, especially shafts and most of all prop blades. I recently found the best diver I have ever had and it makes a huge difference.

Those are some good #s. Thanks for the info.