After they did an engine survey, it took 7 seatrials to get it back to the right injector timing, which they kept insisting on not using.Īnyways, call a good factory detroit diesel dealer and they should be able to tell you all of the specifics. The Covington 12v71's in the 75' Hatteras I run use a unique setting that is for a generator, that you have to argue with any dealer setting the rack because it's not a marine setting and they insist on using the marine setting which causes the boat to black smoke like it has dead cylinders. A lot of the companies changed the injector size and timing from the intial specs when they marinized them depending on what they were trying to achieve with them, such as Johnson Towers looking for more HP and Covington looking for more torque instead of HP. So just the rack needs to be adjusted and possibly the injector timing (which is what I meant to say) to a different setting. They only have a fuel pump and the injectors on DD's act as the injector pump. I found that on the Hatteras, it lost 1.5 knots at cruise, it burned 30gph at cruise versus 45 gph, and it ran very very clean at hull speeds and very clean and crisp throughout the rpm band.Ĭlick to expand.actually, you're right I had a brain fart this morning. You will also have to take a little pitch out of the props so you still achieve 2350 rpm's. Most 8v92's have 140 LPH(liters per hour) injectors, you could probably move down to the 110 LPH injectors. Talk to a DD dealer and ask them about detuning them with a smaller injector. I ran a 58' Hatteras YF with 8v71 TI's and this is precisely what the factory DD dealer did when they did majors on them.
You can put smaller injectors and leave the turbo's and exhaust the same on a DD, the rack and injector pump has to be adjusted as well. Meaning- they will get fuel metered for 80% load, and only seeing 60% load for example and running more fuel rich. If you de-prop the boat, the engines at 1950 rpms will be running a much lower load factor then with the proper props.
Click to expand.You don't want to do this.
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