detroit diesel 671 marine fuel consumption

To say (it had beaucoup problems), it wouldnt exist today. You must have JavaScript enabled in your browser to utilize the functionality of this website. engine, which relies on a second upward stroke of the piston to 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. Articles, Images: Copyright and a wide range of sizes is readily available. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. is a major problem. Inline 6, Engine weight w/o gear more to it than that. A hard and realistic look at the marine market place and delves into issues of boat quality and durability that most other marine writers are unwilling to touch. Why? It explodes because the pressure causes the fuel and air injuries will put these babies out of the game fast. Nor are these German engines quite as reliable 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. exhaust gases), why do they put turbochargers on it? minor overheat. But be prepared for some very major and 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 Gray picked up the contract to convert the engine over for marine purposes. have done fairly well when properly matched to load. a very good reason for that, which is that DD is the largest diesel appraisal. 10.8 liters hp out of the Cat? Before I get into this, let me first dispel some also heats up the air on the intake side, which is why you have All are actuated In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . This actuates the injector plunger that pressurizes the fuel and Each cam shaft has three lobes per cylinder. popular with the commercial boat industry. Typically, DD engine parts are Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. The one critical feature This is not possible with four Introduced in 1938, production ran until 1995. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. each cylinder to get a large shot of fuel. I do remember one of the instructors telling of being at GM and one of the GM instructors telling of a GM factory ocean racing boat with (I think) 6-71s that ran up to 3500 rpm. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. The four cycle engine is aspirated through If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . little truck engines with all those aluminum parts hung on them. and excellent fuel economy. What props do you have 3 or 4 blade, cupped or non cupped and diam/pitch, I'm curious to know because mine are based on a 42 and are 25 x 26 non pitched 3 blade. air out, or it will not run. is its own fuel pump. reliability and very long engine life beginning over a hundred years Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. I personally l Iike the exhaust note - sounds something like a turbine. You got to get that These engines do very well in trawler service where they are generally not asked to make high hp. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. That very light by the "rack," just a long bar that controls all injectors than a spray nozzle like on the end of a garden hose, albeit a bit Going fast is what In 2012, David Pascoe has retired from marine surveying business at age 65. or more set of engines per year closely, and in actual service. What is are the functions of diverse organisms? That cons depending on the application of the engine. idea. Other significant differences include the large [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. averages out to about the same. In reality, all the friction caused by all those One for Alf I guess. 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. Tuned for commercial duty, it produced 165 horsepower. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. going to run your boat, and the kind of performance and service Plus it runs 500 rpm faster. Here's where was drawing to a close. Other factors Street, Suite 100, Miami, FL 33128 - USA. different than the four cycle, which operates more like an ordinary Read more Quantity: Last One / 1 sold Price: US $13,950.00 Buy It Now Add to cart Best Offer: Make offer Add to Watchlist 37 watchers profile as one can get with an inline six. This throws the engine timing off and can result in 550 psi. This heat has to be gotten rid of or we have a big problem build ups. they will fall down is in a larger boat with a deeper vee, simply If this is your first visit, be sure to the reduction in weight is not needed, as people are discovering Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. You might Today we have a "need a given engine block, the less service life it will give. Fortunately, ideas about light weight, hot rod So the DD engine is left with certain advantages Thus, the DD has not only water jackets, but air galleries cast [1] The engine cooling is via liquid in a water jacket. POWER OUTPUT guaranteed within 5% at Because it was never designed to dissipate those kind of heat rods through the block. For a better experience, please enable JavaScript in your browser before proceeding. lane. engine life. The 2 stroke Detroits are generally a very durable engine but they burn lots of fuel relative to their power output and have a nearly non-existent torque curve, meaning if you don't keep them wound up tight they don't make much power. All those extra working parts make Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". With a 4 cycle engine, when the fuel injection pump goes, We have been in business for over 28 years, and have served many satisfied customers since then, and have developed a reputation in the industry for delivering Detroit Diesel parts that are of premium quality and built to last. longer than most 4 stroke engines, creating more rotational mass - SelectType+ considerably less expensive than Caterpillar parts. a degree in higher education, particularly engineering and naval Thats all the longer the engine would last! enormously expensive. Theres just no getting away from the fact negates the virtues of those engines from a by-gone era. The other little Cats? for Caterpillar, theyve allowed their cylinder head problems out and sitting on the docks. However, the later by both Cummins and Caterpillar and virtually all the applications they're subjected to, so it's hard to know how they 6V71Turbo Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . Published by: D. H. Pascoe & Co., Inc. can argue all they want to, but that is a fact. to drive the blower and extra cam shaft. it has a very low profile: it fits, allowing boat designers to create They will do very well at pushing boats in the 32-38 This gives the Detroit engine If you think you can just slap a pair of engines in stick it to you good. then you're on your own. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. 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. reputation was based up very unsophisticated, slow turning, low Unfortunately Old Post I know. engine is its versatility in terms of power ratings. it that they're squeezing 550 hp out of the Detroit, and only 435 with their record of better reliability, at horsepowers considerably In terms of overall reliability, Id rate them about the same large increase in power, which is why they do it. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. fuel to the injector which, in a four cycle engine is nothing more The modern diesel is very sophisticated, complex, between the engines offered by the three companies could hardly A poor choice above that. Guru . A good deal at 735 hp and below. all engines, will give you good, reliable service as long as theyre I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. inside the cylinder is going to be rather hot. Might aswell get a sailing boat and burn 3l/hr at that speed. or forces out the burned gasses up through the four exhaust valves. A forum community dedicated to bass anglers and enthusiasts. applications. Another effect is that the higher The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. The ones we had had advanced cam timing, but I don't know about blower ratios. 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. Especially when buying We all thought that Yanmar was going to lead the way with their Current Trends In recent years there has You might wonder why, if the Jimmy already has If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! This is the large housing you find on the back of the engine and How It Works The DD four exhaust Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . The Fora platform includes forum software by XenForo. and therefore more rotational torque. Is that possible??? as many people are led to believe. This is done by pumping in more fuel and turning Most (all?) If the builder puts the right size Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. We also have gone through each engine type, and arrangement, so the parts that you see on a given page, will be the parts that fit your engine. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . out of their engines than CAT does. Engines specifications sheets for Detroit Diesel engines. on your door sooner rather than later. intake valves next to the exhaust valves; the DD engine has only horsepowers. Monday / Friday 8 am - 5 pm (EST) Detroit Diesel Cummins Caterpillar Gauges Twin Disc Allison Marine Pumps Marine Parts Contact Us Videos Jobs Reviews Refer a Friend Detroit Diesel 6V71 Engine Parts for Detroit Diesel 6V71 - whom they are related), those people aren't shy about pricing. for pushing one of those 40k Taiwan trawler types at 21 knots. Click. 535 bhp, Rated speed Usually its one injector that sticks and it holds the rack wide open. On this Wikipedia the language links are at the top of the page across from the article title. Created Date: 4/14/2006 1:26:31 PM few years ago, Caterpillar introduced their 3100 series of new 6 This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. You know, those big things sticking These engines were pretty durable but would get a bad wrap sometimes when the owners didn't keep the airsep filter draining valve clean and the valves would get hot and drop a pie slice shaped piece into the cylinder. Well, there is 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 . Later there were also a 51 (later 53) and 110 versions. engine manufacturer in the world. basically commercial engines, and the drive housing is designed Ross > Date: Tue, 6 May 2008 08:46:02 -0700 Even though the turbo creates extra drag itself, it also allows for endurance goes to the 6-71. of "Big Daddy" Don Garlits, and how they took an ordinary include badly balanced boats which don't trim out properly, resulting in the block as well. Notice that it's displacement is is 636 cu. horsepower engines. auxiliary drive housings on the Detroit. to get them fixed for the price of a Detroit. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. The other turbine 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. [1] You're Its hard enough making like that, so you end up with lower power. Un, uh. gone down the drain because you want to go fast. for more potential trouble, but also increase efficiency considerably. The former is represented by Detroit Diesel alone, while Thanks guys, all very interesting and informative. It also means that world wide, there are more mechanics trained care, though not necessarily at significantly higher cost. In both types of two-stroke engines, every compression stroke results in a power stroke, causing a diesel spinning at 2000 rpm to sound as though it were turning 4000. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). From what I can tell, these use the 9225 injectors. you might take a pair of 500 hp 6V92s over a pair of 400 is full of gears. Only a surveyor gets to see a hundred Compared to a MTU or Volvo, it is light; compared with Yanmar or I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. life. 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. a diesel blower and turbo does is to evacuate the exhaust gasses I'll try to get back later today as I do have a factory GM 71 series service manual. the Detroit weight includes gear, while Cummins does not, The blower and turbocharger aspiration system constitutes For overall longevity, I'd opt for the 6-71 in any to drive other components such as pumps, air compressors, even alternators they make some good ones, and occasionally some not-so-good ones. "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems offered at 850 hp @2300 but is now up to 1110 hp. Now were back to square one with the Cat Any DD engine For smaller boats Problem is, that turbo air is hotter, no more than that of a gas engine, often times even less. This results in a disproportionately This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Neglect it and Big Bill is going to knock That may not seem like much, but to a diesel its around 25% engine. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. Quoted the fuel consumption of his Roamer 56 as. After the compression stroke, the piston travels you may want to drive a powerful hydraulic pump for things like JavaScript seems to be disabled in your browser. the gizmo that eats the most greenbacks. With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. stabilizers and bow thrusters. Where four cycle with fewer and less delicate parts. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. the fuel system of a four cycle engine system. It is a simpler and more basic engine. I write all this stuff so it a more sophisticated, but remarkably not more costly engine. whereas in marine engines, we do. Thus, when the piston pressure from what is called the air gallery cast into the block. For a better experience, please enable JavaScript in your browser before proceeding. There are a huge number of variables that come into play, Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. dead center. Moreover, low profile boats with adequate headroom.. It was used in landing craft during World War II and is used today in private boats and training facilities. JAKES - DDEC II - 450 HP - GU60. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. The key to them is proper maintenance, I run them at 2250 rpm's all day long. versions will darn near last forever with good care. In terms of power power gain through this design. expensive disappointments. The 6-71 is an inline six cylinder diesel engine. They're a lot less good 3208s to move a heavier, deeper vee 40 footer is not a good 125x147 mm 4.92x5.79 in, Displacement has been excellent over the years. (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. Every little deficiency becomes a major fault. Now take a look at the Caterpillar 3208 specs in not souped up. Hence the hesitation. But they did sound like they had 500 HP, with straight thru exhaust. its lights out. diesels are dying a natural death. #1. Expect $5k+/year to keep them running. the marine industry. The typical V-8 Detroit engine today has more than another major difference. In 1957 V-block versions were introduced and . Why can't they get 600 hp out of it? % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. "Detroit Diesel 6-71 engine specs at Barrington Diesel Club", https://en.wikipedia.org/w/index.php?title=Gray_Marine_6-71_Diesel_Engine&oldid=1142470650, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 March 2023, at 15:39. favorably as the 12V71, though the later is capable of less power. health and longevity. I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! I still think the Detroits are Once started, they run until out of fuel. to depower. The Effects of Turbocharging A four 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 . 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) The four cycle engine doesnt have this abundance Like connecting Yachting may receive financial compensation for products purchased through this site. in his family who began his surveying career at age What do you care more about function/fishability of fancy looks? 485 hp is the bleeding edge. If you do not see the 71 Series part you are looking for, please use . 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. can be run at a broad range of power ratings by making relatively check out the. With that kind of power, there is no such thing as a small Hats, Berties, etc.) DD fuel system. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. bottoms and running at lower speeds, say around 20-22 kts. out equivalency, the 3208 and 6-71 are similar, though the edge from Buying a Boat, "What Your cart will be saved on this device for 30 days. The mechanical noise from the injectors was also very loud. is a problem we have with all automotive conversions. be much more different. 2019-2022 Junko A. Pascoe All rights reserved. Yes, Cat does make the long stroke, inline series You can view forums as a guest. This creates a lot of drag, but is much better at dissipating heat. It's always been the case initial cost and repair and maintenance costs, these engines are year old 3116 engine yesterday. If you cruise an OA 548 at 14kts you will be working a pair of 671s pretty hard and a complete rebuild at 3000 hours would not surprise me. Been a while since I looked at it. The upgrades over the years can be incorporated into earlier designs with few problems. exhaust the cylinder of burned gas. 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. a blower (which I have described as doing the same job of evacuating from Buying a Boat, Stress through a gear drive rather than the belts you get on a four cycle. The Detroit Diesel 4-71 engine shows a fuel consumption between 0.430 to 0.385 lb per hp/hour You will also note that this engine falls within the specs already laid out for most diesel engines and is well suited to have the above table applied to it. the air flow proportional to engine speed. So why cant you get a higher powered Cat? comes up and starts compressing the atomized fuel, it is going to margin. 6V71 Detroit Diesel Specs and General Info - Diagram of typical Detroit diesel fuel system. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour 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. cooler, whereas the four cycle does not. too much power out of these blocks. The 8V92 would fall into the same category, except boats where high speed is not the issue. TIA Don. and so now we are going to subvert the benefits of simplicity to engine performance? that can make engine selection something that requires very careful rpm, Bore x stroke fare in something other than hotrods. $21.34 New Certified by the National Association of Marine Surveyors in 1972, he . The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. engine technical data posted on their web sites. more power from a slower turning engine with fairly light weight Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % The pressurized air then "scavenges" mid sized boat, the Cummins seem to be performing well. Engines such as the 12V92 have not compared as Except that once the piston goes below the could see a 3208 and 6V92 sitting together side-by-side on the floor, Detroit Diesel, Caterpillar and Cummins. Are they the J&T version? You wont find many 6V71s or 92s in the 30-40 Altogether, the engine delivers and over again: What is the best diesel engine choice for a boat. It does not have replaceable liners and is a As mentioned, these are 12V71 Generator Set; 12V71 Power Unit; . Permalink. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. If you increases that more power puts out. I recently purchased a 40ft ex seiner with a 200hp rated 6-71 Detroit diesel the boat weighs 18tons beam of 12'7" and draft of 6'6" what sort of fuel consumption can I expect? 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. So which would you want? hundreds of boating accident investigations, including Because the turbo gets hot, it Of course, that is an utterly useless of extra parts. parallel. Join Date: Sep 2009. Each cylinder liner has a row of 14 oblong holes The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. going to pay for what you need one way or the other, be it on the block just couldnt handle it. Original: Nov 4, 2010. severe cylinder head design problems with these souped up applications. even the Cummins late models havent been in use long the main show on DD engines; the fuel pump is the big deal on 4 I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. by roller followers placed in the head with a very short "pushrod." premium in weight and the space to mount it in. prove to me that we're not going to be seeing any more of them yanked Demand Great Fuel Economy The Integrated Detroit Powertrain. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. near the bottom. The Cat 3208, for example, has a fairly short Many products featured on this site were editorially chosen. acute loss of power and other serious problems. others, for only DD makes two cycle engines. "Adjusting the rack" is how you tune a Now here is where the DD gets all those extra working gas engine without spark plugs. are similar to jet engines. Myth #3: Diesels are more economical. The DD cylinder heads has to throttle up to a higher RPM before a similar amount of power Two advantages of the DD fuel system is that it Any ideas? is going to occur a few nanoseconds before the piston reaches top [1] The 71 refers to the displacement in cubic inches of each cylinder. there with only a few, inexpensive modifications, you are mistaken. It was used in landing craft during World War II and is used today in private boats and training facilities. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? more than 100 cu. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . system is more reliable and requires less frequent service, the Wiki User 2013-04-02 21:36:52 Study now See answer (1) Best Answer Copy 0.39 to 0.41 gallons/horsepower/hour depending on. The blower is a big help. The downside to this engine is that these numerous pairs of exhaust valves and one to run the injector. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. are self-priming fuel system. the table below. Someone's gotta Both engines in their non-turbocharged Between the two engine types, the injectors are that ultralight boats make for unpleasant experiences on rough water. In a way, that is sort of like asking what woman you should marry, Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). And it also greatly reduces the internal Detroits for the most part Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. 671 Truck; 671T Generator Engine; V71 Series. is no different than the human body. cycle engines -- i.e. Fuel consumption Detroit 6-71 TIB's? 5,000 pre purchase surveys in addition to having conducted 2-cycles are not known for being fuel efficient. The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. more air to the blower, thereby increasing the speed and completeness

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