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Diesels for boats

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Old 01-25-2011, 07:41 PM
  #241
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Jeff, how many hours a year do you boat? If it was 1,000 hrs and 3 years would it be Ok and then what would you pay per engine?
Joe..about 100-120 on the NorTech, and around 150-200 on the Albury Brothers CC. Both boats have been sold...BUT...On our CC for 2010 its about 260 hours, but its the only boat I have at the moment. I actually coukld have put on more but we really had a rainy year.

around-40k
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Old 01-25-2011, 08:20 PM
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FPT Really well done!
Yes but too bad the dam things weigh 3000lbs.
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Old 01-25-2011, 08:47 PM
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Jeff, the Cummins base warranty is 2 years 1,000 hrs so pratically speaking on a perfromance boat, performance diesel, 3 years or 300 hrs would have wroked for you or put you in better spot than a base Cummins warranty. Not that it matters I was just curious about your thoughts on that.

As far as price goes, 40k for the diesel sounds like "a deal", the Merc 600hp has to go for almost that much?

Again not really driving at anything just would like to know what people think is fair?

Comparing 1990's pricing a 400 hp "B" retailed for about $18,000 no trans that's $45/hp. Take that to the 600hp and it's $27,000, so your $40k for 600hp might be a fair number today?

Does anyone know what a 600hp Cummins C sells for today, I'm curious?
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Old 01-25-2011, 09:24 PM
  #244
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Yes but too bad the dam things weigh 3000lbs.
they weigh about 1350lbs + trans,

so i guess twin's would weigh around 3 k +
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Old 01-26-2011, 04:20 AM
  #245
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Does any UK member know this firm?

http://www.chipexpress.com/products/2458/

I have twin Volvo D6 370 with DPH drives in My 38" Wellcraft Excalibur. (cruising at 40 knots and top speed is 44-45 knots) I'm not forced to change my drives to DPR as the DPH's Nibral propellers cant take the cruising speed my boat goes.

With DPR I should be able to map some more Hp/Torque to upper range as those D6's with their 5.5litre engines are quite mildly tuned.

Anyone else with D6's?
You can use the stainless GR- propellers from the DPR with a spacer(same shaft). The DPR-legs makes only difference in speeds over 50 knots.
You can not get more than 385-390 hp from the D6-370. The limitations are the size of the turbo,intercooler and injectors.
We got about 470 hp from the D6-435 with help from Volvos R&D guys. The 435 has different pistons, larger IC, turbo and injectors.
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Old 01-27-2011, 10:10 AM
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You can use the stainless GR- propellers from the DPR with a spacer(same shaft). The DPR-legs makes only difference in speeds over 50 knots.
You can not get more than 385-390 hp from the D6-370. The limitations are the size of the turbo,intercooler and injectors.
We got about 470 hp from the D6-435 with help from Volvos R&D guys. The 435 has different pistons, larger IC, turbo and injectors.
Thanks!

Whats the diffrence in DPH and DPR drives in the ratios, they are different right? So if I put DPR props to those DPH drives (the smallest size) how does it work.

I'm now using the size 8 in the DPH drives.

Last edited by Convertible; 01-27-2011 at 11:22 AM.
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Old 01-27-2011, 01:33 PM
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Thanks!

Whats the diffrence in DPH and DPR drives in the ratios, they are different right? So if I put DPR props to those DPH drives (the smallest size) how does it work.

I'm now using the size 8 in the DPH drives.
Think there a two or three ratios on the DPH. Should be found at Volvo Pentas website. The DPR gears fit in the DPH-housing.

The DPR has a 1:1,36 ratio. My boat hit the revlimiters at 60,5 knots with the largest GR9 props. With modified GR9;s and a modified 3730 rpm revlimit it topped out at 65,3 knots (75,1 mph). Still at the limiter.
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Old 01-27-2011, 02:07 PM
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Think there a two or three ratios on the DPH. Should be found at Volvo Pentas website. The DPR gears fit in the DPH-housing.

The DPR has a 1:1,36 ratio. My boat hit the revlimiters at 60,5 knots with the largest GR9 props. With modified GR9;s and a modified 3730 rpm revlimit it topped out at 65,3 knots (75,1 mph). Still at the limiter.

Hi Thanks!

It seems that the ratio is 1.63:1?

http://www.mitabmarin.se/pdf/Vp/di_aq/D6-370_DP.pdf

So how does that go with the GR propellers?

What boat do you have? Really nice speed you got there!
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