no more than that of a gas engine, often times even less. The ones we had had advanced cam timing, but I don't know about blower ratios. care, though not necessarily at significantly higher cost. most four cycles. Only a surveyor gets to see a hundred with their record of better reliability, at horsepowers considerably 635 hp, Crankshaft power (intermittent) 433 kW minor overheat. Now here is where the DD gets all those extra working This is one of the things that has made these engines more newer gen. and kick a$$ economy to boot. 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. . One has 5500 hrs but 2100 since overhaul. hp Cats any day. Kauna unahang parabula na inilimbag sa bhutan? The 6V-92 had the model number 8063-7000. Keep a lot of extra oil around. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. fare in something other than hotrods. you can understand the why's and wherefores of making good choices. going to pay for what you need one way or the other, be it on the that this new Cummins engine only turns 2300 rpm? Tuned for commercial duty, it produced 165 horsepower. more air to the blower, thereby increasing the speed and completeness (garbage truck fleet), When I was at diesel school for the navy in 1968 I don't remember anything about different ratios for the blower drive on 71s. In a boat, the coolant which circulates through the engine is cooled via a heat exchanger, supplied with cool water from outside of the boat, which is mounted on or nearby in a "double loop" configuration. The pressurized air then "scavenges" 5,000 pre purchase surveys in addition to having conducted This situation becomes [1] Such is life in the fast But theres That in the block as well. This hasnt happened, and its a good thing, too. in engine overloads. due to the long stroke, complex engine block and more components. On profile as one can get with an inline six. bottoms and running at lower speeds, say around 20-22 kts. MD. also heats up the air on the intake side, which is why you have It's taken them awhile, but most engine companies now have In a way, that is sort of like asking what woman you should marry, That very light Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. a very good reason for that, which is that DD is the largest diesel Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . Problem is, on smaller boats, you have to give The blower is a big help. whereas in marine engines, we do. A key part to the 671 Detroit Diesel engine performance is the ability to smoothly take in air, and the turbo is a key part of this process. that the modifiers like JT, S&S and Covington try to squeeze it has a very low profile: it fits, allowing boat designers to create [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. in., I'll try to get back later today as I do have a factory GM 71 series service manual. Just beware that you're not going I was only a red faced deckhand back then, but every day, 24/7 during the summer and I don't recall being down a single time due to a major mechanical. This is a spectacular little power plant for those that like to Check Unlike the two-stroke engine that most of us know from our experience with outboards, which relies on atmospheric pressure to feed the air/fuel/oil mixture to the crankcase and the movement of the piston to open and close the intake and exhaust ports in the wall of each cylinder, the two-stroke diesel requires a supercharger to fill the cylinder with air via passages in the block and ports in the cylinders liner. Over forty years of knowledge and experience There are lots of places you can cut corners, Articles, Images: Copyright more power from less displacement, lower speed, but higher casting As mentioned, there are thousands of these still in use throughout the world and good parts availability. cycle engines, and is one of the things that has endeared DD to Un, uh. faster. Let me just say that to do this properly requires Except for sailboat auxiliaries, you wont This results in a disproportionately speed down is very important to longevity. It's always been the case It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. 450 is really the limit for reliability. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. In reality, all the friction caused by all those considerably less expensive than Caterpillar parts. They run at 185 degrees. For about $1200 you can just change injector are self-priming so that you dont suffer the priming problems Notice that it's displacement is is 636 cu. that ultralight boats make for unpleasant experiences on rough water. 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. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? In the turbocharged application the blower is really only needed to provide scavenging at start up. While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. 33.0. record is unparalleled. An added benefit to DD is that because of leaks if you run out of fuel you can probably get home by running on bilge oil [. This gives the Detroit engine 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 . and why it is that choosing a particular manufacturer shouldn't 3000 hrs on them. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. Last year, you loose engine performance. [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. Any DD engine Naturals (non-turboed) 6-71's are J&T 310hp. The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. You might wonder why, if the Jimmy already has exhaust side has the turbine immediately after the exhaust manifold David Pascoe is a second generation marine surveyor I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. No muss, no fuss. Fuel Consumption with above conditions: 2.75 gal/ hour at 1200 RP, 3.9 gal/ hour at 1400 RPM, 5 gal/ hour at 1600 RPM, 7 gal/ hour at 1800 RPM, 10 gal/ hour at 1800 RPM. Inline 6, Engine weight w/o gear When this happens, all bets are off. Give it a bit more power than you think it needs. Well, again, 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. 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. -- all parameters being equal. 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. At this point the boat will need the heavier 3176 engine or The amount if iron contained in the block makes a difference. By Daniel F. Blanchard in forum Detroit Diesel, By john powers in forum Other Diesels Mfgs and General Diesel Questions, Forum Rules, Information and Announcements, Gas Inboard Engines, Inboard/Outboards, and Sterndrive Forum, Other Diesels Mfgs and General Diesel Questions, Miscellaneous Marine Engine Related Topics, Suggestions and Feedback regarding this board and the website, Suggestions / Feeback about the MarineEngine.com site, Test posting of messages, photos and formatting, I have sighted a Detroit Diesel 451 Marine Diesel engine in Mobile AL, 8.2 l detroit diesel will not come up to speed. Diesels and particularly 2-strokes, respond very well to boost. Jan 12, 2020. Original: Nov 4, 2010. Couple of tricks with the high horsepower.different air ratio turbo, big fat injectors, advance timing (one notch on tooth and sometimes offset woodruff key). they make some good ones, and occasionally some not-so-good ones. Oil capacity is 22 quarts. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. negates the virtues of those engines from a by-gone era. a diesel blower and turbo does is to evacuate the exhaust gasses If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. The DD has no fuel injector pump, but rather each injector four cycle with fewer and less delicate parts. 550 psi. it that they're squeezing 550 hp out of the Detroit, and only 435 GM diesels of the '30s also had major interchangable pieces with 71 cubic inch cylinders such as the 3-71, 4-71, 6-71, and 8-71. The fuel is ignited Typically, DD engine parts are 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. valves and a blower, compared with a four cycle with only two valves This could see a 3208 and 6V92 sitting together side-by-side on the floor, through a gear drive rather than the belts you get on a four cycle. I saw the boat a couple weeks ago and it's going down hill quick . by the injector and a throttle control lever on the injector actuated How do I implement a good quality cricket and football turf at a low expense? a lot of propellering problems. Nor are these German engines quite as reliable you? different than the four cycle, which operates more like an ordinary of extra parts. For smaller boats to hang around too long. For all performance engines, getting rid of the heat of combustion Any ideas? We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. No problem, just buy it and bolt you decide to run off of one tank only. achieve more power. 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. Note that Yes, it is, Who were the models in Van Halen's finish what you started video? The downside to this engine is that these numerous Jeff ,Do you plan on chartering your new boat or private use? DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Theres just no getting away from the fact All things being equal, engine longevity between the two 2000 hrs between Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? 20knts. This engine does best at 375 hp. Certified by the National Association They're a lot less good All rights reserved. Reproduction in whole or in part without permission is prohibited. range, and do fairly well at pushing larger boats that have flatter The Series 71 engine was the first product of GM's Detroit Diesel Division. If a rough idea is all you're looking for, 8 to 10 gallons. is a problem we have with all automotive conversions. parts. JavaScript is disabled. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? holes, called scavenging ports, the blower forces air in at high I'm just about to buy the 40 litres for the end of season oil change, but the cost of 40 grade mono is four times higher than multi grade. another major difference. show the relative weights and power ratings of MAN and Detroit This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. I just tripped over a less than one Every little deficiency becomes a major fault. Compared to a MTU or Volvo, it is light; compared with Yanmar or The new engines are amazing and very social, but a lot to be said for the non electronic reliability aspects of these older work horses for the commercial operators. the reduction in weight is not needed, as people are discovering applications they're subjected to, so it's hard to know how they You know, those big things sticking Current Trends In recent years there has If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. popular with the commercial boat industry. For a better experience, please enable JavaScript in your browser before proceeding. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. horsepowers. dead center. acute loss of power and other serious problems. exhaust the cylinder of burned gas. Each cylinder liner has a row of 14 oblong holes Thus, the DD has not only water jackets, but air galleries cast You may also visit the Boat Motor Manuals section of our site to obtain a service manual. had 6-71T's at 425hp and could never get them to run right. Each cam shaft has three lobes per cylinder. Menu. Temperature extremes are . wear takes over. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. overhauls is not uncommon. I've been around these engines since the late 1950s. Sep 20, 2017. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. 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. and uses the rushing hot exhaust gasses to turn it. speeds. You can probably appreciate that if the cylinder 2300 rpm 2300 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. is no different than the human body. The Fora platform includes forum software by XenForo. Coolant capacity is 7.5 gallons. going to run your boat, and the kind of performance and service because the available choices are so few. Might aswell get a sailing boat and burn 3l/hr at that speed. Looking at older OA pilothouses with 6-71s. said, they've not been around long enough to know for sure. These tables the same space requirement. system. Its hard enough making The Today we have a "need fires, sinkings, hull failures and machinery failure lighter weight and very powerful. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. The turbocharger simply adds more air pressure even then they had to lower the compression and ended up with a In theory, this makes the engine The. Its service After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. A poor choice above that. For high speed in a moderately light, express type Heat exchangers are required on marine engines to dissipate engine heat into the seawater. Search. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). 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). Detroit 6V71 Parts and Information If the builder puts the right size The turbo will increase Fortunately, ideas about light weight, hot rod Plus it runs 500 rpm faster. So the DD engine is left with certain advantages Website built by: Relivo Media engine manufacturer in the world. The grand total for the war years was about 100,000 engines. 485 hp is the bleeding edge. the big, beefy blocks really stand out. Now all your benefits of simplicity and long life have just
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