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New Cummins/Mercruiser Project

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Old 09-27-2008, 10:37 AM
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That Cumings engine looks cool in that boat.
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Old 09-27-2008, 10:54 PM
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NXT
Thanks Rik
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Old 09-27-2008, 11:38 PM
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Awesome. 1000lbs of torque each.

I think you guys might be comparing the wrong engines. The 525 ony makes 550 lbs of torque I think. In a boat, the torque number is way more important than the HP #.

IMO, and this might be just a little off, 2 of those mills in a boat would be comparable to 4 - 525's, not 2.

THerefore, the fuel savings numbers would be off the charts.

You don't really see torque numbers like that with engines under 1000HP, and those things drink fuel like it is coming out of a garden hose.
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Old 09-28-2008, 12:01 AM
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Is there more info on the engine on a mercury website somewhere?
Cummins Mercruiser Diesel Site: www.cmdmarine.com

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Old 09-28-2008, 03:15 AM
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Originally Posted by Stormrider View Post
60mph:
Diesels @ 40gph
525s??? will they even push that 43 @ 60mph cruise? @ 60gph? (figuring 1g/mile burn rate, which may be optimistic.)
Cruise might be a relative term.. I'd love to se some performance specs on that thing, it looks awesome.

Although the diesels are more efficient then 525's they're still only 500hp. The huge torque at low rpm can only be exploited through gearing and propeller selection. The 525's have more hp and are therefore capable of doing more work then the 500hp diesels which will translate into more speed on the top end. Torque aint nothin, without rpm.
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Old 09-28-2008, 06:49 AM
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Cummins Mercruiser Diesel Site: www.cmdmarine.com

thanks , i saw that site but didn't see these particular engines listed yet ????
Is there a model #, etc??
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Old 09-28-2008, 09:02 AM
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29 firefox - wazz-up!!!

Nice to have that laptop!!!

I know CMD doesn't have a 500hp, it's a 480 but do they still use the plus/minus 5% or with all the electronics are they able to keep them closer to the 480? I just wondered how they said they're 500's (was it the 5% factor)?

Jeff1000man - I have to back up HaxbySpeed here, I write abut it and have proven it in fact several times with our own diesel race boats Hp = Hp regardless of the source. Why are the turbine boats so much faster? If you went by torque numbers they should be very slow, the fact is they have more Hp and less weight - hence speed.

Torque is controlled through the gearing to give you the optimum propellar speed you need to achieve the mph you want to attain.
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Old 09-28-2008, 12:04 PM
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Thanks for the info/input....
Gary
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Old 09-28-2008, 12:46 PM
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I am understanding.
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Old 09-28-2008, 09:49 PM
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theres a guy doing it with duramax eng's,and i saw pics of a ''gale banks'' duramax setup
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