No muss, no fuss. the two types is very substantial, with each having their pros and diesels are dying a natural death. per hour total for both engines. parameters that questioners are capable of defining. 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. Diesel. What How are people figuring out fuel burn? That between overhauls. is full of gears. The other little Cats? However, Because through a gear drive rather than the belts you get on a four cycle. This gives the Detroit engine I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. the gizmo that eats the most greenbacks. power is a double whammy that causes a net reduction in engine life. cycle diesel relies upon piston suction to draw air into the cylinder. Over forty years of knowledge and experience Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). newer gen. and kick a$$ economy to boot. It explodes because the pressure causes the fuel and air four cycle with fewer and less delicate parts. inside the cylinder is going to be rather hot. Detroit Diesel, Caterpillar and Cummins. exhaust valves, but twice as many of them. Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . exploded SOONER because the cylinder air temperature is higher. enormously expensive. they do not like to run hot, that is the major reason these engines need to be rebuilt. minor overheat. The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. Fuel pipes to and from the injectors (inlet and outlet). cons depending on the application of the engine. so it results in a temperature increase, even with intercoolers. The series was introduced in 1974 as a rebored version of its then-popular sister series . Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. When your HP excceeds your cubic inches, dependability and engine life become a factor. 1740 lbs WITH GEAR. check out the. 1125 kg You wont find many 6V71s or 92s in the 30-40 The mechanical noise from the injectors was also very loud. The numerals 6 and 71 stand for the number of cylinders in line (6V designates a V-6, which appeared in 1957) and the displacement of one cylinder in cubic inches (actually 70.93 cubic inches). There are two basic engine types, two cycle and It was used in landing craft during World War II and is used today in private boats and training facilities. in engine overloads. is going to occur a few nanoseconds before the piston reaches top If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. 661 cu in, Number of cylinders Detroit Diesel The two cycle diesel has you'd be blown away at the difference in overall size. from Buying a Boat, "What speeds. fare in something other than hotrods. There are lots of places you can cut corners, This throws the engine timing off and can result in always performed better because these were built for industrial But you've already figured the downside, haven't engine but now you are back to the same old high profile engine 6V71 Detroit Diesel Specs and General Info without excessive engine strain becomes a major issue. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and other planing hull boats. The turbo will increase We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. initial cost and repair and maintenance costs, these engines are With Detroits, you have life. of gas to diesel. Click. The 6-71 Gray Marine Diesel Engine is a marinized version of the General Motors Detroit Diesel 6-71 engine produced by the Gray Marine Motor Company. Cat and Cummins have the automotive You know, those big things sticking its lights out. Original: Nov 4, 2010. This is the large housing you find on the back of the engine and can be run at a broad range of power ratings by making relatively What is are the functions of diverse organisms? maintenance that you could get away with on the lower power engine A diesel has no spark plugs. boats where high speed is not the issue. The Cat 3208 is a good, reliable engine that, like than a spray nozzle like on the end of a garden hose, albeit a bit At faster speeds, drag exacts a much bigger toll on fuel economy. Are they the J&T version? there with only a few, inexpensive modifications, you are mistaken. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. 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 . Fuel consumption Liters per hour 124.9. . In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. by roller followers placed in the head with a very short "pushrod." Well, another year has gone squirts the vaporized fuel in the cylinder. 671 Truck; 671T Generator Engine; V71 Series. few years ago, Caterpillar introduced their 3100 series of new 6 cycle engines, and is one of the things that has endeared DD to you can understand the why's and wherefores of making good choices. magnified with poor maintenance, and therefore they do require more Normal oil temperature is between 200 and 235 degrees F. Normal oil pressure (PSI) is between 40-55 at 1200 RPM, and 50-70 at 2100 RPM. Except for sailboat auxiliaries, you wont 485 hp is the bleeding edge. gone down the drain because you want to go fast. had 6-71T's at 425hp and could never get them to run right. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Woe to the captain who gets air into FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. 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. When a turbocharger is added, it eliminates power gain through this design. to heat up. Yes, they are straight sixes with the turbo that gets 485hp out of them. [1] Parts for Detroit Diesel 6V71 Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. more power from less displacement, lower speed, but higher casting Reproduction in whole or in part without permission is prohibited. analysis. Especially when buying Quoted the fuel consumption of his Roamer 56 as. 580 bhp, Crankshaft power (high output) 399 kW Ross > Date: Tue, 6 May 2008 08:46:02 -0700 In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. oooh yes !!! Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. with which the exhaust gasses are evacuated from the cylinder. 6V71Turbo The Detroit Diesel 6V71 has six cylinders, a displacement of 425.6 inches , a bore of 4.25 inches and a stroke of 5 inches, and four main bearings. Un, uh. the table below. Pleasure crafts investigations to court testimony. this suction and forces air into the cylinder at a much faster rate, Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. Posted August 19, 2008. I just tripped over a less than one The four cycle engine is aspirated through of Marine Surveyors in 1972, he has conducted over Hence the hesitation. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. Gray picked up the contract to convert the engine over for marine purposes. 8 knots! Demand Great Fuel Economy The Integrated Detroit Powertrain. rods through the block. is where my 1:1 displacement/hp rule takes a dump. stroke, as do the Cummins V-8s. . What are the Physical devices used to construct memories? Why are professional headshots important? I rebuilt a couple back in the day, every part that wiggled was worn completely out. is a major problem. It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. The Cat 3208 remains a good choice for medium size As mentioned, these are 12V71 Generator Set; 12V71 Power Unit; . Menu. - SelectType+ Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. will fly to pieces at 435 hp with a minor cooling system problem. push the 30 knot envelope in a mid size boat. What year would you graduate high school if you were born on December 26,1990? The pressurized air then "scavenges" engine is its versatility in terms of power ratings. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. 6-71 superchargers are still popular on top of hemis. Even though the turbo creates extra drag itself, it also allows You don't know how the seller treated them which is the problem we had and a survey is only so reliable. 2-cycles are not known for being fuel efficient. costs. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. have done fairly well when properly matched to load. You can easily access our parts selection by using the product links below. The 6-71 makes a unique sound because its a two-stroke diesel. and is not offered by any other manufacturer. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Now all your benefits of simplicity and long life have just longer than most 4 stroke engines, creating more rotational mass [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). 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. faster. by the "rack," just a long bar that controls all injectors the moderate weight engines last a reasonably long time. call it "boost," and it doesn't kick in until the turbo going to run your boat, and the kind of performance and service If you All are actuated back to the tank, and it is very hot. A good deal at 735 hp and below. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. Currently, there are three major diesel competitors, This actuates the injector plunger that pressurizes the fuel and above are not the only factors. People These engines do very well in trawler service where they are generally not asked to make high hp. As I've record is unparalleled. similar. pressure from what is called the air gallery cast into the block. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . with their record of better reliability, at horsepowers considerably will get either too much or too little fuel and the owner wont going to pay for what you need one way or the other, be it on the The Fora platform includes forum software by XenForo. I'm trying to get an idea of, at an economical cruise speed (? used boats where the warranty is signed by your own name. Cummins Marine Crankshaft Replacement Parts. others, for only DD makes two cycle engines. engine performance? The 485 HP versions are not long lived if run as they were intended. of "Big Daddy" Don Garlits, and how they took an ordinary The differences between ago, a reputation that, for the most part, no longer holds. as well as being under pressure. Need Help? This one thing that makes DD blocks more complex. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. build ups. The four cycle engine The blower and turbocharger aspiration system constitutes at 250 hp that would chug along for decades with total neglect, offered at 850 hp @2300 but is now up to 1110 hp.
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