not very long

There has been a lot of talk about marinizing the Duramax over the years. At first, it was held back by production limitations. They couldn't build enough for their truck orders, so why sell them to marinizers?

At this point, a Duramax marine engine is probably a dead issue. GM is replacing this engine with a new V8 diesel of their own design near the end of 2008.

Michael

You've never really driven a jetboat, eh?

I've jammed a bayliner jazz in reverse at speed. It swamps the boat, but only the passenger compartment. it just takes a minute to get back on plane. It's really fun, as long as the water isn't too cold.

I'd imagine with a RIB it would be even less of an issue. The bow of that jazz was really close to the water, on a 10m RIB it probably takes a little more to stuff it.

jtmiller Why do you think "not too long" when the old 6.5 two valve motor is being sold with a gurantee @ 400 hp.Don't you think the DURAMAX is a much better motor, with only 25 % more power output than the 6.5 there shouldnt be a longevity issue.
michael1 I haven't heard about the '08 "new" V8 ,Tell us more! There must be some EXTRA DURAMAX motors around because IMCO and PENSILULAR are both ready to come out with a marine version of the DURAMAX. Twin turbo ,closed cooling GM bellhousing bolt patern,launch date fall '07 CHEERS AW

I seem to remember a thing on speed channel the other day. They were talking to gale banks, they asked whats next. He said he was taking his S10 on going to spank some people, plus he is developing a marine division durmax motor. So maybe he has taken the advise of taking his twin turbo d-max and stuffing it in a boat...

Those numbers sure are not on the Cummins spec sheet I have. Maybe there is a typo on yours. But for sure, Cummins has no magic technology to generate twice as much power per gallon as anyone else on Earth.

I agree with you. If you put 800HP in a 28 Daytona you may see those speeds.


You should see 60% to 80% better mileage with diesel.

That's why diesel is a good way to go.

The thing you need to stay aware of is that weight slows you down, or makes you need more HP to go the same speed. So going from twin 900 lb gas big blocks to twin 1500 lb diesels will mean you carry 1200 extra lbs, and that will take a lot more HP to go the same speed.

Also, those Cummins are A LOT heavier than they say: 1850 is what I was told when they put the complete engine on the scale -- still without drive -- at Hallett.

How much does your Daytona weigh with twin 496? I'll give you an estimate on speeds with diesels (using the Crouch equation which is pretty accurate).

Just stumbled on this thread. While it is not listed or even uncovered, I have decieded to sell my diesel cigarette. I have owned it for 10 years now but being a 4 boat owner I don't put enough hours on yearly(15 hours max) to keep it any more.

Here are the basics
1986 41' Cigarette Attack
Arneson SP1200 Surface drives=(ASD8)
Rolla Propellers
Twin Disc 1:1 Transmission
Cat 3208 TA (375hp)
Top speed new 55mph(saltwater)
The fastest I run it is 52 mph(freshwater)
18000 lbs=heavy
Aronow was ahead of his time in 1986. Back then the 3208TA had the best power to weight ratio. Now I'm told yanmars are the ticket. Unfortunatly I don't have any digital pics to upload. But will try to take some this weekend when I uncover it. Should you be interested.
I hope by offering this information dosen't come off as rude, but it may be a option for you or you wife. The price would be less than 50,000.00 euro fob Detroit, MI. Gotta like the exchange rate. This is a complete working boat having spent the last 10 years in fresh water here in detroit.
Good luck in you search.

this thread is worthless without some pics.... :D

Duramax in MTI.... :drink:

What marine 6.5L has a guaranteed 400 hp? So far all I see are promises on the web, but when you call them, they say, "Ah, oh, that's still in development." Same thing with all these Duramax marine conversions. I'll believe it when I see more than a prototype, and they are being shipped and installed in production boats.

Unfortunately, I don't know anything more about the new GM V8 diesel for light trucks, other than the projected ship date of 2008. This was mentioned in Automotive Engineering, and unofficially confirmed by a person in the marine diesel engine business. I would guess they will use some of the technology developed for the new 2.9L V6 diesel for the upcoming V8.

Michael

Has this thing run? I saw that picture a few months ago but still haven't seen any numbers. Should do well.