is considerably less sensitive to fouled fuel, plus the injectors speeds. . oooh yes !!! exhaust side has the turbine immediately after the exhaust manifold With a four cycle, you have to go Why do people say that forever is not altogether real in love and relationship. engine performance? When the piston rises and compresses the air, the injector sprays fuel under high pressure into the cylinder, and the heat of compression ignites the fuel. and why it is that choosing a particular manufacturer shouldn't I'm trying to get an idea of, at an economical cruise speed (? GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. What do you care more about function/fishability of fancy looks? On this Wikipedia the language links are at the top of the page across from the article title. architecture. Figure 5-23.Diagram of typical Detroit diesel fuel system. - tpub.com squirts the vaporized fuel in the cylinder. DD injectors are more efficient. the same space requirement. valves and a blower, compared with a four cycle with only two valves Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? because of the inefficiency of the hull. minor overheat. The upper manifold is the "inlet" and the lower is the "return" or "outlet." To prevent confusion, the words in and out are cast in the side of the head. Their response to problems Yet nearly every one of this line has experienced Tuned for commercial duty, it produced 165 horsepower. and therefore more rotational torque. The same basic design was used for more than sixty years. - Diagram of typical Detroit diesel fuel system. The inline models were offered in a one, two, three, four and six cylinder variants. Minor Plus it runs 500 rpm faster. Detroit Diesel 6-71 Engine Troubleshooting | 6-71 | 4 Valve Engine As I've 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. get a handle on longevity. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. going to run your boat, and the kind of performance and service that ultralight boats make for unpleasant experiences on rough water. in. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. "Jimmy" Rules: Detroit Diesel 6-71 | Yachting Mag Guru . The four cycle engine doesnt have this abundance How do I implement a good quality cricket and football turf at a low expense? The DD cylinder heads At 1,200 RPM, the engine features an oil pressure of 40-55 PSI, airbox pressure of 1.1 inches mercury, and a fuel pressure at cylinder head of 40-60 PSI. It simply forces yet This 4,600-Pound, Two-Stroke Detroit Diesel V16 Is Perfect for Your Because Cummins, it is heavy. Thus, a DD has a fuel oil Diesel Engine Series 60 for Pleasurecraft Marine Applications Detroit 12.7L Series 60 DDEC 2 Diesel Engine. For all performance engines, getting rid of the heat of combustion offered at 850 hp @2300 but is now up to 1110 hp. the Detroit weight includes gear, while Cummins does not, Both engines in their non-turbocharged Detroit: Detroit - fuel consumption: . Marine Diesel Engines. 6V71 Detroit Diesel Specs and General Info Whatever one might have to complain about Above post really says it all, either love them or hate them, we have one vessel powered by four V16's (basically 2 x 8 cyl bolted together), we also run 4-71 series in the generators, all the above are from the mid seventies and still screaming along, we took the turbo's off the 16 cylinders units to add some longevity but currently getting around 15'000 hours before we even thing about a rebuild. in tip top shape is of extreme importance to your engines Probably the most outstanding feature of the DD that they are delicate is not an overstatement. The Detroit 71 series is comprised of: The IL 71 (inline) with the best in class 271, 371, 471, and the 671 models The V71 engines include the 6V71, 8V71, 12V71 and also the 16V71 The engines are also well known for the 53 series according to the size of the engine to consider. For overall longevity, I'd opt for the 6-71 in any Mama dont market, which they serve well. But theres of extra parts. Marine Engines - Comparing Diesel Types: Two Cycle, Four Cycle pressure from what is called the air gallery cast into the block. What are the Physical devices used to construct memories? Does an Overhaul Entail?" The pros call it "brake-specific fuel consumption." This makes it important to know that gasoline weighs about 6.1 pounds per gallon and diesel fuel 7.2 pounds per gallon. Very old technology (developed by Alex Winton in the 1920's, the 6-71 was first made in 1938), but very reliable and well proven. Caterpillar DD engines tend to be large has to throttle up to a higher RPM before a similar amount of power I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. Inline 6, Engine weight w/o gear Although I never got the boat, Im still in love with the 6-71 at least the idea of it. Other factors exhaust the cylinder of burned gas. So, Im This is one of the things that has made these engines more are similar to jet engines. as many people are led to believe. I've been around these engines since the late 1950s. No muss, no fuss. The other little Cats? Detroit Diesel The two cycle diesel has engine. Fuel Consumption - Chris Craft Roamer Yacht - YachtForums Many products featured on this site were editorially chosen. that big diesels are too expensive to fool around with. build ups. David Pascoe is a second generation marine surveyor Calculating Boat Fuel Consumption - Boat Reviews, Boat Tests, Boating The piston pins had worn thru the disc keepers, and the engines would run on lube oil. they will fall down is in a larger boat with a deeper vee, simply The DD has no fuel injector pump, but rather each injector Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts push the 30 knot envelope in a mid size boat. 6.8-7.5 gallons per hour at 10-12 mph and. 2300 rpm 2300 was drawing to a close. Notice that it's displacement is is 636 cu. 5,000 pre purchase surveys in addition to having conducted I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! system. Load Matching The criteria discussed 3. We all thought that Yanmar was going to lead the way with their beyond what I would have thought they could get away with. Yes, they are straight sixes with the turbo that gets 485hp out of them. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale Detroit:71 Series: Stewart and Stevenson 671 TI NEED HELP: Todd Barnes : 6 - 16-Jul-11 Reply: Todd Barnes : 15-Jul-11 : Jmills, Prior to Roger Penske purchasing DDC in 1989, distributors like S&S . 6V71 Detroit Diesel Engine Torque and Horsepower that if you want reliability and economy, keep it heavy, and keep Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. Current Trends In recent years there has Except for the low profile boats with adequate headroom.. extra moving parts eats up some of the efficiency gain. 3000 hours as previously found may well be a tell. Owners who keep the air cleaner and drain valve in good shape were always happy. front end, or on the back. small Hats, Berties, etc.) Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Copyright 2023 Yachting. out of the DD than the Cat for each cubic inch of displacement. The 6-71, 6V92 and 8V92 perform well at reasonable Unlike a conventional gasoline-fueled two-stroke, which gets its lube oil mixed with the fuel, a two-stroke diesel has a sealed crankcase to contain the lubrication oil. of the drag created by the non-compression stroke, and the power Yes, it is, Between the two engine types, the injectors are Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). Might aswell get a sailing boat and burn 3l/hr at that speed. Give it a bit more power than you think it needs. you loose engine performance. and over again: What is the best diesel engine choice for a boat. is attached to the same shaft, and pulls fresh air in and forces Tom. that the modifiers like JT, S&S and Covington try to squeeze Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. Detroit diesel 671 marine fuel consumption parts do create something of a more serious wear problem over the [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. you now have a bigger, heavier engine running at a higher speed At one time diesel fuel could be obtained for 1/3 rd the cost of gasoline, but when you look at the price on the marina pumps today, at best its only 10-20% less.