Fishinghaoliboy

I am purchasing a new boat, new to me and it has a Cummins 210 hp engine. Any ideas on what can be done for more HP in this model. I am wondering if I can change the fuel plate to get some more ponies if I want them. Also I remember reading on here that the marine motors have more timing in them and I know that this same motor the 5.9 L is in some boats with 350 hp so if any one has ideas please join in. Bigger injectors and maybe a larger turbo? There shouldn't be any restriction in the exhaust. Anyway if I want more what can be done?

Don M

Tell me more on the year of the engine. Injector upgrades work good. 370 injectors are cheap and go right in. If you can get me the CPL and serial number I can find out more.

A water manifold pyro is a good idea if you dont have one already.

Don~

Fishinghaoliboy

The boat is a 1996 so I would say the engine package is either 96 or 95. I don't take possession for another couple of weeks so nothing pressing. I just heard it was not very fast but think even with the hp rating now it should do 20 knots which is fine. Just wondered what I could do if I wanted more.

MikeR

I worked on a guys new 45' yacht that had two 300hp cummins 12 valvers.
I put in 370 inj, bumped the fuel plates forward just a tad and tweaked the governer springs for 250 more rpm. The boat already marine HX40 turbos. The owner also had new props made to make better use of power and move the boat faster.

The turbos were different...the exhaust housings were water cooled, so you may want to check yours out before purchasing truck parts for a boat motor.

INJECTOR JACK

370 marine engines have a full load duty cycle or other wise melt down.

natloz2

build them to a cpl 1975

natloz2

build it to a cpl 1975

mikmaze

once you build up the power you will still have roughly the same rpm limiting factor for speed, with current prop you will get to said speed faster but won't go any faster. Unless the boat couldn't even pull up to it intended high operating rpm anyway. if you do the upgrades get in with a good prop guy and tell him what the engine makes as far as power and then tell him what you want out of it and he should be able to get you a better prop pitch blade count and maybe even a larger diameter to make use of the new power.

Pop-Pop

milkmaze is correct. If the boat can come up to power reasonably quickly, more power will help only if you put a bigger or higher pitch prop on it. I have a 25 foot Stieger Craft with a 200 HP Volvo turbo diesel, duo-prop outdrive and it will almost throw you down at startup and run a top speed of just under 40 MPH. Top speed varies with load, wind, wave & trim. Really, anything over 30 MPH in a large boat is too fast.

CaptainDD

You have many different factors to add in before you add more power. What type of transmission are you running? What is the diameter of your shaft? How much clearance do you have for increasing diameter of your props? What type of hull do you have? Is the fresh water cooling that you have on the boat going to support the increase in horse power? Most shaft drive boats are slow because of the drag of the gear in the water. My boat is a 30ft by 10ft AL Hull 10000lbs with twin 260HP gas. I cruise at 35KNOTs to end 50Knots. I have had several different engines in this boat. Before these merc's I had twin DPE Volve diesels. They where 179HP cruise 26Knots and Top end 30Knots. I change to gas because I had one Volvo go bad and need a replacement and could not get one soon enough. My other boat is a 35ft by 12ft FG 18000lbs. It had 280HP twin Cummins it cruised at 22Knots top end was 25Knots. I sold the engines out of that boat because I need more speed. Am looking at New Volvo Dual Props or if I go back to shaft drive 450 Cummins,Cat, or Yanmars.
What ever I do the bottom line my boat must Cruise at 30 plus Knots. Here is a site that might help you. http://boatdiesel.com/index.cfm?CFApp=19&&Red=NRU

John Schuchert

I know this post is old, but it came up when I was looking for model numbers for turbos, and I have to add something here so people don't screw up their motors by listening to the really really really bad advice on here!!

I own a fleet of fishing boats here in Costa Rica, I have a 210, 250 and 330hp cummins motors, all of which I built. We have 5 boats and 5 motors in storage. There are several things they share in common. The block, the heads, the crank and the exhaust manifold. What they do NOT have in common are the PISTONS (the higher HP have lower compression), the Camshaft, the intake manifold (the 300+ hp motors need to have salt water aftercoolers on them), the injection pumps are different, the injectors are different, the fuel lines are different and the turbos are different.

If you have a 210hp cummins and you try to put in 370hp injectors, the fuel lines won't hook up to the injectors, because the heads of the 210hp injectors are smaller than the 370. If you build new lines, all you will do is run a super rich mix, blow black smoke and make less power. The 210 also have a rotary pump vs the inline Bosch P7100 that the 300-370hp motors use. The 250hp motors use a Nippodesso pump with Delphi injectors. All the tubing is different between all of those motors.

When I first started, i put 210hp pistons in a 330hp build, thinking they were the same because some moron wrote something in one of these blogs. The higher compression of the smaller dish on the 210hp pistons caused detonation, and around 2500 hours, the rings were toast. Now we get 6000+ hours out of the 330s, around 12000 hours out of the 250's and 15000+ hours out of the 210's.

Don't write crap on the internet if you don't know what you are talking about, you are going to screw up people's motors!!!!!!

There are several differences between the 210hp, 250hp, 300hp and 370 hp cummins motors. you CAN NOT just stick in bigger injectors and think you'll make more HP. What you will do is richen up the mix and burn more fuel and make less HP. It is soo much more complicated than that. Do it right, (using the CPL 1975 is 330hp) and your motor will work for a long time. it's expensive though. If you want to find the right parts, look up "quickserve cummins" in google and type in the serial number of the motor that you want to copy. That will get you all the part numbers you need.