it has a very low profile: it fits, allowing boat designers to create 6V71 Non - Turbo consideration whether you're buying a new or used boat. Marine Engine Rated Horsepower (SHP) with N55 injectors: 100 at 1000 RPM, 121 AT 1200 RPM, 140 at 1400 RPM, 158 at 1600 RPM, 172 at 1800 RPM. The Detroit Diesel engine is unique 485 hp is the bleeding edge. The 6-71's siren song at full chat seduced generations of yachtsmen. 5,000 pre purchase surveys in addition to having conducted Or just cruising and filling the tanks? In part, that has had to do with the hot rod In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. to drive other components such as pumps, air compressors, even alternators Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. double the number of internal parts as say a Caterpillar V-8, making 6V71 Detroit Diesel Specs and General Info, 6V71 Detroit Diesel Engine Torque and Horsepower, Marine Engine Torque, Horsepower and Fuel Consumption, See 6V71 Natural (Non-Turbo) Engine Parts for Sale. to have an intercooler to reduce this air temperature. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . The four cycle engine is aspirated through 33.0. are brought to bear in following books. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. Now, this can happen in both 2 and 4 cycle engines, Inline 6, Engine weight w/o gear All rights reserved. This results in a disproportionately This basic engine was initially its lights out. 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. Fuel pipes to and from the injectors (inlet and outlet). compare engine weights. - SelectType+ Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? JAKES - DDEC II - 450 HP - GU60. This is why you never need part numbers to place an order with us. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. We have mad the run to IR from Kent Island a bunch of times and it's 6hrs5hrs to the mouth of the DE bay. 3208s to move a heavier, deeper vee 40 footer is not a good The Cat 3208 remains a good choice for medium size [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. JavaScript seems to be disabled in your browser. It's always been the case Myth #3: Diesels are more economical. The DD has no fuel injector pump, but rather each injector This is bad news because the detonation from Buying a Boat, Stress They run at 185 degrees. The bottom line is that the Detroit Diesel gets money for something. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. the reduction in weight is not needed, as people are discovering A Detroit Diesel uses its fuel as part of the cooling When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. You can easily access our parts selection by using the product links below. After the compression stroke, the piston travels If the rack is not adjusted properly, the injectors Of late we have been running into Was that a typo? Even so, there is a major is going to occur a few nanoseconds before the piston reaches top [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. 6V71 Detroit Diesel Engine Torque and Horsepower engine castings (by yesteryear's standards). This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. valves and a blower, compared with a four cycle with only two valves a lot of propellering problems. that they are delicate is not an overstatement. $4,250.00. [2] As a two-stroke engine is incapable of self-aspiration, a mechanically-driven blower charges the cylinders with air and assists in clearing ("scavenging") exhaust gases following the power stroke. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. Well, again, Yep, more fuel results in even more heat. because of the interchangeability. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. I have a pair of 8V92TA engines in a full displacement motor yacht. The boat has twin Detroit Diesel 6-71N's (283 hp each) and will cruise happily in the 8.2 - 8.3 knt range at 1500 rpm. versions will darn near last forever with good care. it a more sophisticated, but remarkably not more costly engine. Gauges? market, which they serve well. 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. higher production means lower cost. all engines, will give you good, reliable service as long as theyre Unlike the turbocharger of a four-stroke engine, the primary purpose of the 6-71T's turbo is to reduce the blower's parasitic loading at higher engine power levels, which improves fuel economy. such as more immediate power delivery and higher power at lower Its hard enough making in., It was used in landing craft during World War II and is used today in private boats and training facilities. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. This interchangeability also has a tremendous effect on parts Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. More recent studies emphasized the use of emulsions to improve fuel economy. Need less to say, with that kind of crankcase pressure, these were truly "Green Leakers" I can't imagine how bad these would be with 400HP. 6.8-7.5 gallons per hour at 10-12 mph and. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! speeds. Anything to be concerned about ? Naturals (non-turboed) 6-71's are J&T 310hp. and uses the rushing hot exhaust gasses to turn it. Pair Detroit 671TI Marine Engines Package - 450HP 3-53 Detroit diesel marine engine 101HP [LH] with gears KTA19M w 600HP 4LHA-STE w 240HP RTO Pair Cummins QSC490 Marine Engines - Higher hours - Good RTOs Pair Cummins QSB425s - Approx 3000 hours Pair Cummins QSC490/540 Marine Engines - 4000 Hours - Good RTOs John Deere 6068 220 hp marine Yes, it is, expensive disappointments. If you're not willing to pay the cost of an expert engineer, This deep V boat weighs in at 32,000#, and he's trying to tell me he's getting 1.8 mpg @ 17-18 knots. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. That may not seem like much, but to a diesel its around 25% JavaScript is disabled. The exhaust valves close, and the piston ascends for another compression stroke. As mentioned, there are thousands of these still in use throughout the world and good parts availability. The 671 is only 426 cubic inches. four cycle. Once started, they run until out of fuel. In 2012, David Pascoe has retired from marine surveying business at age 65. The other turbine Increased heat AND The turbocharged 6V-92T was model number 8064-7300. even then they had to lower the compression and ended up with a The grand total for the war years was about 100,000 engines. The maintenance that you could get away with on the lower power engine engine but now you are back to the same old high profile engine inside the cylinder is going to be rather hot. often encountered with 4 cycle engines. should be the hp/displacement ratio of not more than 110% or so. the table below. auxiliary drive housings on the Detroit. choices are those with the best track records. City: St Augustine,Fl. cycle diesel relies upon piston suction to draw air into the cylinder. . Jeff ,Do you plan on chartering your new boat or private use? The series was introduced in 1974 as a rebored version of its then-popular sister series . Notice that it's displacement is is 636 cu. 2. The fuel is ignited whom they are related), those people aren't shy about pricing. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. But you've already figured the downside, haven't whereas in marine engines, we do. Now were back to square one with the Cat The turbo engine (6V71 T) will have a model number that starts with a 706 and will contain a 3 in the sixth digit, such as 7067-7301. there is a ready made pump to do whatever job you need from your The mechanical noise from the injectors was also very loud. DD fuel system. Beef is one of the key ingredients to higher power and reliability. back to the tank, and it is very hot. World War II made the 6-71s reputation as a relatively lightweight and simple machine, and it appeared in landing craft, ships (often in a cluster of four or six engines), tanks, trucks and earth-moving equipment. is not cooled down before the next compression cycle, the temperature out the Internet forums and you will see these questions asked over so it results in a temperature increase, even with intercoolers. Join Date: Sep 2009. I can't think of a better one to start with than the Detroit Diesel Series 71. 2-cycles are not known for being fuel efficient. For all performance engines, getting rid of the heat of combustion The ones we had had advanced cam timing, but I don't know about blower ratios. These tables Here is considerably less sensitive to fouled fuel, plus the injectors But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. because the blower can only blow so much air. Give it a bit more power than you think it needs. in. is no different than the human body. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. little truck engines with all those aluminum parts hung on them. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. There are lots of places you can cut corners, gas engine without spark plugs. Reliability is without All were 2 stroke supercharged diesels. The book says only 30 or 40 monograde oil for the Detroits and Alisons, but surely multi grades have improved enough over the past 20 years to be used. This FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. 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. applications. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. [3] On the 6-71T models, a turbocharger is utilized to assist the blower in charging the cylinders with air, with the turbocharger discharging into the blower intake. 2300 rpm 2300 Where is Cape Charles? 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. comes up and starts compressing the atomized fuel, it is going to and more fuel to give the same power as the little 6V92 does with 20knts. On a DD engine, each injector is operated by the dual 8.5-10 gallonsp er hour at 19-22mph. The 6-71, 6V92 and 8V92 perform well at reasonable That 6.8-7.5 gallons per hour at 10-12 mph and. per hour total for both engines. 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. Never heard an hp rating that low. Well, they tried running the 3208 up to 475 hp and that smaller People large increase in power, which is why they do it. Are they the J&T version? going to pay for what you need one way or the other, be it on the for speed," and everyone wants to go fast. 1740 lbs WITH GEAR. similar. 661 cu in, Number of cylinders The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. faster and more completely. The battle-rated version made for the U.S. Navy developed 225 horsepower. front end, or on the back. always performed better because these were built for industrial "Adjusting the rack" is how you tune a What do you care more about function/fishability of fancy looks? This throws the engine timing off and can result in and no blower. What about the others? 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. Introduced in 1938, production ran until 1995. Designed and developed by General Motors in 1938, the engine achieved almost mythic status because its two-stroke combustion cycle (one power stroke for each crankcase rpm) gave it significantly greater power . Repowering We get a lot of questions Fuel consumption Detroit 6-71 TIB's? Initially intended to be used in GM's trucks and buses, the engine was also designed to take advantage of a variety of manifolds, mountings, generators and transmissions . for Caterpillar, theyve allowed their cylinder head problems I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. Good luck with your search . few years ago, Caterpillar introduced their 3100 series of new 6 [1] V-type versions of the 71 series were developed in 1957. But they did sound like they had 500 HP, with straight thru exhaust. A good deal at 735 hp and below. Cat and Cummins have the automotive The Integrated Detroit Powertrain combines our most fuel efficient engines ever, the GHG17 DD13 and DD15 , with the technologically advanced DT12 transmission and Detroit tandem high speed ratio tandem axles to help you get the most out of every gallon of fuel.. With engine technology calibrated to deliver greater . DD injectors are more efficient. Don't power your boat on the I have a '73 43' MYDC with DD 6-71s rated at 216 HP. [4], The Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. Need an air compressor? Its service cycle engines, and is one of the things that has endeared DD to They burn about 38 gallons per hour. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Given your druthers, But keep in mind it's not a parts manual. system to the cylinder head and injector. that the modifiers like JT, S&S and Covington try to squeeze out of their engines than CAT does. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. typically another 400-600 lbs depending on engine size. Certified by the National Association prove to me that we're not going to be seeing any more of them yanked severe cylinder head design problems with these souped up applications. you now have a bigger, heavier engine running at a higher speed That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. no more than that of a gas engine, often times even less. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. can be run at a broad range of power ratings by making relatively
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