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New Cummins/Mercruiser Project

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Old 02-06-2009, 12:48 PM
  #181
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so whats the top speed on her?
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Old 02-28-2009, 03:36 PM
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Cruises all day between 70-75, at 3500rpms....
Range is 450-500 miles...

Boat has just been offered up FOR SALE in the Classified...Bob's ready for a new project...
CLICK HERE
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Old 02-28-2009, 03:54 PM
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Originally Posted by vanthemanmorrison View Post
so whats the top speed on her?

3500 rpms is top..so must mean 75mph..

Shueman..it might help with a price in the add. Good luck.
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Old 05-28-2009, 08:28 AM
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sweet ride! We forget that diesels are made to run at 90% for long periods of time so this thing must be the ultimate cruiser....so nice!
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Old 06-18-2010, 01:34 AM
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Who what where & when?
Banks first brought out a twin turbo 500hp Duramax. He has since modified it with a supercharger on top of the motor in conjunction with the twin turbos. This engine makes 800hp/900tq and is offered in a cruiser version with [email protected] and also in a performance version with [email protected]

Banks says the first two motors are the 5800s for a Customs boat. He didn't say what drives but SSM6s sound about right for this application, or maybe Arneson 7s or 8s.
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Old 11-23-2010, 08:43 AM
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Originally Posted by shueman View Post
Cruises all day between 70-75, at 3500rpms....
Range is 450-500 miles...

Boat has just been offered up FOR SALE in the Classified...Bob's ready for a new project...
CLICK HERE
Does anybody know what happened to the boat. We are fitting a identical engine drive package into our 43 foot and would love to know how the boat finally was set up
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Old 11-23-2010, 11:00 AM
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I think the motors and drives were pulled a long time ago. It has been going through the auction in SoCal for the past 4 months. I just looked and it isn't showing up, so maybe somebody scooped the hull up. If not, it will show up again in about a week. Last time I checked, you could get the whole boat minus drives and power for about $70K
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Old 11-23-2010, 11:00 PM
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If that is true it is a damm shame!

I've said it on here 50 times if not more, the problem is not the diesels it's the application, nobody listens to their own experiences going fast with gas power and just translates what they did to go fast into the diesels.

Well, maybe my luck will change soon, we'll make some money again and I mean no disrespect to anyone but I'll show you all how it's done!
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Old 11-24-2010, 05:48 AM
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It is a shame, still, we are going ahead here in the UK with two boats in build using Cummins 480 NXT. Previously we have fitted Yanmar ASD8s. We have had initial problems with the NXT 1.35 ratio supplied with massive slip. The NXT only takes an 18" diameter prop and the torque is too much.
We are awaiting 1.15 ratio drives and then we will sea trial again. Will post speeds etc after that happens.
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Old 11-24-2010, 07:08 AM
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Jeffboat,

Can you post pics here, I never renewed my subscription?

If not can someone that can send me there email, I'm looking for some old pics to post and prove a point with?

Jeffboat, next, the boats your building will never be fast, no insults intended.

Answer me a question - if you were building the same boats but with 480hp gas engines what dia propellers would you be using?

The torque is not your problem nor is slip. You can only have excessive slip if the propeller is first turning at the speed it is designed to turn at. I would bet money (that I don't have- LOL) that your propeller first of all just is not even close to spinning the RPM it needs to spin to be effecient. I think too many people just assume that a propeller is designed to work at a wider range of speeds than it really is and therefore has too much slip.

Look at it this way, if I have a 1,000 hp engine at 7,000 rpms and I hold it back so it only can turn 4,000 rpms and now only makes 500 hp - do I still have a 1,000 engine? Some people would say "my engine is only making 500 hp, so something is wrong with the engine let me start checking the carbs or timing, etc, etc"

Last edited by HabanaJoe; 11-24-2010 at 07:11 AM.
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