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N855 Thank you all for your advice concerning the turbo issue. I do not think it would be an advantage to go turbo from what l have learnt from you. So I have decided to take your advise and forget about the turbo. And rather use Dry Exhaust and keel cooler on the engine. Thank you.

Hello, its good to be back. Well l am looking for advice on how to marinize a natural aspirated Cummins N855. First, is it possible to change this industrial type to marine application? If the answer is, then what type of turbocharger and injectors can l use to refit this engine. All advice and...

I need to answer some questions. 1. The boat is intended for purse seine fishing. 2. Speed: 9-10 knots 3. Lwl - 63ft. The reason I went for 4:1 ratio is because of the transfer capacity of the engine. In this case its hp/rpm, which gave me 0.22. Now the gearbox with that transfer capacity has...

Thanks FF, but the problem is I am in Ghana, therefore, I do not have access to this information. It is not in our library.

Hi, First let me thank you for reading this thread. I am working on a new wooden fishing boat with the ff: It's a 68 footer with 400hp engine @ 1800rpm, gear ratio 4:1, Displacement of about 150000Ib. I have used two prop calculators and they all recommend 50x45x4 propeller. The problem is a...

That is right, they are built on STEYR technology from Austrian based STEYR DAIMLER PUCH.

I stand to make a saving of 45%.

Criag, I will be sending you some pictures of the time the boat was lunched. I went for a new propeller and its been fantastic so far. I just found that there is dealership in Accra(the capital) that service trucks and generators that have WEICHAI engines. I am going to talk to those guys...

Thank you for your contribution in sorting this out. It is 50/50 situation. Well I have been checking on the company and their performance looks good on paper. They have been in the automotive business for the past 60 years. They manufacture marine engines in the range of 35Kw - 9000Kw. They are...

Hi, I have just been introduced to a Chinese manufactured marine engine; The manufacturer is WEICHAI and model is WD10C300-21. May I know if any of you have come across marine engines from this company and how do they stand out. I understand their engines are used extensively in the far East and...

I am very concerned about overloading the engine. Anyway I have been speaking to a prop manufacturer and just as David earlier suggested, he said I should change the gearbox ratio or the propeller. He recommended 36"x24" prop for that engine which is close to what boatdiesel calculator gave...

I have attempted to post the performance curve but I have en counted problems. Anyway thanks to all who contributed to this thread. Just before I came on line I had then decided to end the chase and order a new prop. But from what i have just read I will give a try and see what happens. Money is...

Djmarchard, thanks a lot for your help, for the information provided would be very helpful. The engine I have is a turbocharged & aftercooled engine with a displacement of 8.3 liters, weighs about 640 kg. According to the performance curve, peak output torque and power output takes place at 1800...

Djmarchand, this maybe a silly question, is it possible run the boat at 82% of its stated rpm which is 2200 at 218hp, 82% would bring it around 1800rpm. Now when I run the boat at this rpm I am wondering what horse power am I going to get out of the engine. Please check the prop sizing on this...

Bligh, I agree with you, I need to have my wife slap me around a few more times that would make me to remember not to make that stupid mistake again. Djmarchand, thanks for your advice. I am going to scourt around for a good prop shop and see what they can do.

I hate to admit it I think I am being screwed over. The engine is from China and taking them on legally is a bit dicey as I have learned. This is not going to happen again. Now they have offered me $1500 off my next purchase. They explanation given by the manufacturer was that the one that I had...

Good morning. I ordered a 3 blade 40x27 propeller for a 57 footer wooden fishing boat which is under construction. I arrived at this selection based on the power of the engine which was 164Kw(220hp) @ 1800 rpm. I ordered this engine as well. But when I took delivery of the engine I realized...

As earlier indicated it is to drive a deck winch, and the winch is to be driven directly off the engine. A whole lot of information has been presented that might solve the problem and I am going to contact all the sources. Hopefully I will find a solution to this. I appreciate you all for...

Good morning, may I know if any of you have used or come across Cummins 6CTA8.3-M220 (marine version). The problem is I am trying to locate the PTO on this engine to repower a winch. The Operation and maintenance manual is silent on that. It is quite easy to identify pto's on some marine engines...

Tidahapah, thanks for the picture. Anyway by the time I was able to open your album (with other pictures) I had already posted a reply.

Rudder design Tidahapah, Is there any chance you can post the picture of your rudder. I am seriously considering this profile. I have to design a rudder with a chord length of 2ft 6in (30 in) and a span of 40+ inches because I have got a prop of 40" x 27" for a 57 footer. Would it be...

Rudder design That was a very neat modification to the rudder. Thanks for the picture, apparently people would not ascribe to this design if it does not improve steering. May I know the size of the propeller you've got on there and also the LWL of the boat. Thank you. Edington

Good day to all of you. I have a 57ft wooden fishing trawler with LWL 0f 52ft under construction.t I have got a point that I need to design and build a rudder which conforms to best practices in the business. The chord length is estimated to be 2.6ft. I have got three designs in mind. The...

I would like to thank every one for their advice on how to address the prop selection problem. Based on your advice I contacted Mr. Robert Olds in Australia and has helped in selecting the appropriate prop for my kind of operation. This is a great family. My regards to all. Nabb

Cpseudonym is right no naval architect is involved. The boat builders are a bunch of carpenters who have learned how to build boats. Sometimes I get frustrated when they can not answer technical questions. Thank God they are not building aircraft. As an engineer (not marine) I do not like guess...