Found this Nautica 24' Cat

excubey · 23 May 2013, 21:40

2008 24'Foot Nautica Inflatable Rib Catamaran I/0 Volvo D4-260 Turbo Diesel | eBay

Its not mine *yet , but was wondering what folks think of the price ?

zip · 24 May 2013, 00:52

It's pretty, but that price is the starting price. They might want twice that.

That engine sure does take up a lot of space though.

Good luck.

excubey · 24 May 2013, 15:49

It does take up space, but I expect it would really be a smooth ride with that extra weight and the cat hulls.

On the cost - this thing has been up 4 times on ebay, and posted elsewhere for months - it won't sell at the reserve price.

ncp · 24 May 2013, 18:07

Quote:

Originally Posted by excubey

On the cost - this thing has been up 4 times on ebay, and posted elsewhere for months - it won't sell at the reserve price.

+1
It's been around a while.

smitty477 · 24 May 2013, 19:08

I own a 24' Nautica RibCat with twin 150 outboards.

FWIW - the problem with diesels on these Ribs are plentiful including:
1. Large loss of space/seats
2. I/O has more draft / needs more water
3 Deeper I/O limits performance/outboards run much better up on jack plates
4. Hard to service diesel

Hope this helps

ncp · 24 May 2013, 19:41

Quote:

Originally Posted by smitty477

1. Large loss of space/seats

Yes

Quote:

Originally Posted by smitty477

2. I/O has more draft / needs more water

True, but in CA we don't need a shallow draft. No flats, intercoastal waterway, rivers, etc.

Quote:

Originally Posted by smitty477

3 Deeper I/O limits performance/outboards run much better up on jack plates

Very true! I'd bet raising my outdrive would give me better performance...it's buried deep!

Quote:

Originally Posted by smitty477

4. Hard to service diesel

Personally, I think servicing my Cummins is much easier than any outboard (except maybe the 30hp two-stroke I have on the sib). But, this has Volvo...

smitty477 · 24 May 2013, 20:08

"Very true! I'd bet raising my outdrive would give me better performance...it's buried deep!"

Absolutely - these Cats like the props very near the surface for good performance. We run ours near the very top of the 5" jack plate heights to get the best all around speed and acceleration. Also when needed I can lift the motors with the props clear out of the water for towing, beaching, and working on them. The prop will be that much lower due to the extra #500+ on the stern of the boat.

"Personally, I think servicing my Cummins is much easier than any outboard (except maybe the 30hp two-stroke I have on the sib). But, this has Volvo... "

I would guess you have 6b's in a larger boat that keeps the engines clean and dry with good all around access for the most part similar to the larger boat we have. IMHO - putting a 1,500# supercharged , turbocharged, 4 valve per cylinder, intercooled 3,600 rpm diesel in one of these boats is looking for a problem for numerous reasons. If you consider this configuration please do your homework on the issues.

Hope this helps

ncp · 24 May 2013, 20:14

Quote:

Originally Posted by smitty477

I would guess you have 6b's in a larger boat that keeps the engines clean and dry with good all around access for the most part similar to the larger boat we have.

Yep, 24 foot rib and my 6B only 210 hp... non-aftercooled, all mechanical...

Now a large common rail electronically controlled Volvo....different story.

smitty477 · 24 May 2013, 20:24

"Yep, 24 foot rib and my 6B only 210 hp... non-aftercooled, all mechanical..."

So you are likely only pulling 150 hp or so out of the Cummins at a decent cruise. That would equate to a safe rate of about 25 hp per liter of engine displacement and running in the area of 2,300-2,500 rpm's.
That is quite different than extracting up to 260 hp out of 3,.7 litres of engine at 3,500+. And once you deal with the Cummins issues with the raw water pump and the aftercooler they run really well without too much attention. Since you have no aftercooler (JWC?) then you have some of the least issues to deal with.
Every engine has its issues no matter what the type - the key is to get the ones with the least issues, deal with them, and and use them as they are best situated.

Hope this helps

ncp · 24 May 2013, 20:37

Quote:

Originally Posted by smitty477

"Yep, 24 foot rib and my 6B only 210 hp... non-aftercooled, all mechanical..."

So you are likely only pulling 150 hp or so out of the Cummins at a decent cruise. That would equate to a safe rate of about 25 hp per liter of engine displacement and running in the area of 2,300-2,500 rpm's.
That is quite different than extracting up to 260 hp out of 3,.7 litres of engine at 3,500+. And once you deal with the Cummins issues with the raw water pump and the aftercooler they run really well without too much attention. Since you have no aftercooler (JWC?) then you have some of the least issues to deal with.
Every engine has its issues no matter what the type - the key is to get the ones with the least issues, deal with them, and and use them as they are best situated.

Hope this helps

Yes, spent plenty of time on boatdiesel...I'm not pulling anywhere near the hp you can from this engine which is why they say that there will be some longevity to it. Since most of my cruising is off the coast of CA in snotty conditions, a 25 knt cruise makes me plenty happy

No raw water issues yet. I've rebuilt the Sherewood 1716 to the tune of $200 so far and keep up with impeller changes. The 1716 I run is 2 sizes two big for a non-aftercooled engine (no SWAC or JWAC) my temps stay happily in check.

smitty477 · 24 May 2013, 20:50

Sounds real good, that should serve you for quite a long time with such a well thought out configuration.

"No raw water issues yet. I've rebuilt the Sherewood 1716 to the tune of $200 so far and keep up with impeller changes"

Perhaps consider Tony Athens produced replacement water pumps the next time you are in need - they are quite superior to the stock pumps as we have installed more than a few out here. You can find much more good info on the 6b's at his site as well at sbmar(dot)com.

Hope this helps