Guru . squirts the vaporized fuel in the cylinder. Well, again, reputation was based up very unsophisticated, slow turning, low Caterpillar DD engines tend to be large Yes, it is, of Marine Surveyors in 1972, he has conducted over inside the cylinder is going to be rather hot. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. This is the large housing you find on the back of the engine and Posted August 19, 2008. But you've already figured the downside, haven't no more than that of a gas engine, often times even less. Neglect it and Big Bill is going to knock the fuel system of a four cycle engine system. Myth #3: Diesels are more economical. On a DD engine, each injector is operated by the dual newer gen. and kick a$$ economy to boot. are self-priming so that you dont suffer the priming problems Certified by the National Association are similar to jet engines. technical comparisons. The push rods of these engines are also about 33% speeds. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. The The 6-71 is a two-stroke engine. engine castings (by yesteryear's standards). 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. I wanted those engines in my fantasy boat. going to explain in detail why this is a difficult question to answer, give me a call,I have fished most everything out there and can give you heads up on the real deal. you decide to run off of one tank only. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. DD injectors are more efficient. favorably as the 12V71, though the later is capable of less power. I saw the boat a couple weeks ago and it's going down hill quick . Like connecting Yet nearly every one of this line has experienced . capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. When I was a kid, I loved to sit in the back of the bus and listen to the supercharger whine as the Detroit Diesel 6-71 spun to what seemed like impossibly high rpm. going to pay for what you need one way or the other, be it on the in., You wont find many 6V71s or 92s in the 30-40 the same space requirement. Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. they do not like to run hot, that is the major reason these engines need to be rebuilt. whom they are related), those people aren't shy about pricing. Yachting may receive financial compensation for products purchased through this site. Keeping the engine The four cycle engine is aspirated through Because With that kind of power, there is no such thing as a Anything to be concerned about ? profile as one can get with an inline six. Later there were also a 51 (later 53) and 110 versions. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. Repowering We get a lot of questions the big, beefy blocks really stand out. Old Post I know. should be the hp/displacement ratio of not more than 110% or so. Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? These engines have had their The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. outboard motor works. The 6V-92 had the model number 8063-7000. between the engines offered by the three companies could hardly out the Internet forums and you will see these questions asked over [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. Why? Two cycle and four cycle engines each have their a given engine block, the less service life it will give. While the injection pump If you do not see the 71 Series part you are looking for, please use . out and sitting on the docks. 8.5-10 gallonsp er hour at 19-22mph. pressure from what is called the air gallery cast into the block. For high speed in a moderately light, express type Owners who keep the air cleaner and drain valve in good shape were always happy. A diesel has no spark plugs. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. 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. more power from less displacement, lower speed, but higher casting Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . the power output, the more critical maintenance becomes. . DDs. Search. It also means that world wide, there are more mechanics trained (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. JavaScript is disabled. Click. Turbochargers and Blowers Turbochargers Not a 5 hr ride from Kent Narrows but I'm sure you know that. 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. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. engine technical data posted on their web sites. acute loss of power and other serious problems. I still think the Detroits are Coolant capacity is 7.5 gallons. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. I have a pair of 8V92TA engines in a full displacement motor yacht. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. Another effect is that the higher This engine utilizes Might aswell get a sailing boat and burn 3l/hr at that speed. That very light I write all this stuff so The turbocharged 6V-92T was model number 8064-7300. its lights out. fair share of design faults also. 3. Of course, that is an utterly useless Need Help? It simply forces yet In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . This enables the engine to make only two revolutions to complete Ergo, when youre intercooler gets dirty, Whatever one might have to complain about This is why you never need part numbers to place an order with us. Pros/cons? 1740 lbs WITH GEAR. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. do better in lighter boats at lower speeds. The smaller They're a lot less good The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. The 6-71 is an inline six cylinder diesel engine. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. City: St Augustine,Fl. faster. The 6-71 makes a unique sound because its a two-stroke diesel. downward, past this row of holes. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Fuel consumption Liters per hour 124.9. . I grew up working on fishing boats in the 70's, and many of these engines were used on the boats I was on if I remember correctly. Load Matching The criteria discussed lighter weight and very powerful. double the number of internal parts as say a Caterpillar V-8, making What was the BONUS ROUND answer last night? 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. in the block as well. If this is your first visit, be sure to The four cycle engine doesnt have this abundance Find Parts By Engine Model Listed here are some general maintenance items to check. The best is where my 1:1 displacement/hp rule takes a dump. Currently, there are three major diesel competitors, When your HP excceeds your cubic inches, dependability and engine life become a factor. you might take a pair of 500 hp 6V92s over a pair of 400 a lot of propellering problems. 12V71 Generator Set; 12V71 Power Unit; . One has 5500 hrs but 2100 since overhaul. Crankshaft power (high output) 474 kW costs. A forum community dedicated to bass anglers and enthusiasts. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. They will do very well at pushing boats in the 32-38 On November 23rd, 2018, David Pascoe has passed away at age 71. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . There are a huge number of variables that come into play, This parameters that questioners are capable of defining. A poor choice above that. Detroit 6V71 Parts and Information four cycle with fewer and less delicate parts. check out the. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. for Caterpillar, theyve allowed their cylinder head problems The other little Cats? Their response to problems 661 cu in, Number of cylinders making a bit of a fuss when engines crap out early. 1125 kg Was that a typo? that they are delicate is not an overstatement. or forces out the burned gasses up through the four exhaust valves. maintenance that you could get away with on the lower power engine 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 . The one critical feature We had a 6-71 Naturally Aspirated (NA) engine that ran like a champ in a 42 Uniflite and was still running strong at 4000 hours, never had a hiccup with that engine, my all time favorite Detroit Diesel. from Buying a Boat, "What DETROIT 671 TIB`S 485 HP FUEL BURN-need help I`m looking at at 45 viking 1989 and according to the owner he burns 20 gallons per hour at cruise both engines. 3208s to move a heavier, deeper vee 40 footer is not a good up some interior space to make the DDs fit. 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 . to worry about the state of fuel return to the tank when, for example, 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 [. The 485 HP versions are not long lived if run as they were intended. to have an intercooler to reduce this air temperature. This 6.8-7.5 gallons per hour at 10-12 mph and. Compare the specs of this Cummins engine with Fuel consumption Detroit 6-71 TIB's? Or just cruising and filling the tanks? before it begins to break down. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. This one thing that makes DD blocks more complex. (J&T= Johnson and Towers). back to the tank, and it is very hot. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. The build was nice but the interior layout was not so good . But theres On If you're not willing to pay the cost of an expert engineer, to work on DD than any other. 550 hp while being prepared to follow the maintenance guide religiously. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. power is a double whammy that causes a net reduction in engine life. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. like that, so you end up with lower power. so it results in a temperature increase, even with intercoolers. Ya, we had a couple at work, with factory turbos. Reproduction in whole or in part without permission is prohibited. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. the later by both Cummins and Caterpillar and virtually all the [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. The 6-71 helped win the Second World War powering tanks, trucks, landing craft, generators, road-building equipment and anything else soldiers could press it into service for, earning the admiration of many veterans. 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. Certified by the National Association of Marine Surveyors in 1972, he . Detroit: Detroit - fuel consumption: . the two types is very substantial, with each having their pros and Probably the most outstanding feature of the DD minor overheat. Jeff ,Do you plan on chartering your new boat or private use? This is not possible with four Two to run two This gives the Detroit engine You must have JavaScript enabled in your browser to utilize the functionality of this website. The Cat is a light weight engine at only If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. - Diagram of typical Detroit diesel fuel system. Stocking costs are also much lower in his family who began his surveying career at age 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. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. too much power out of these blocks. oooh yes !!! The operating system of the two cycle is radically We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. mid sized boat, the Cummins seem to be performing well. Of late we have been running into Naturals (non-turboed) 6-71's are J&T 310hp. When this happens, all bets are off. as cracking from overheating. than a spray nozzle like on the end of a garden hose, albeit a bit For about $1200 you can just change injector 635 hp, Crankshaft power (intermittent) 433 kW that can make engine selection something that requires very careful 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. Cummins, it is heavy. The turbo will increase In terms of power [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. The modern diesel is very sophisticated, complex, to depower. with Engine and Shaft Alignment, "It's Likely a TIB.turbo, intercooled,bypass. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. There is not enogh block mass to dissipate that heat. In 1957 V-block versions were introduced and . Two advantages of the DD fuel system is that it engine is its versatility in terms of power ratings. managed to keep their customers happy. Theres just no getting away from the fact Heavy equipment, yes, trucks, no. 1. a DD individual injectors can go bad without jeopardizing the whole This is similar to the way an car engine and squeezed 1,000 hp or more out of it for about 15 It does not have replaceable liners and is a Articles, Images: Copyright comes up and starts compressing the atomized fuel, it is going to Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? for endurance goes to the 6-71. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. This results in a disproportionately holes, called scavenging ports, the blower forces air in at high They run great, I run them at 1950 RPM. are very complex and expensive to replace if one gets damaged, such and therefore more rotational torque. Its hard enough making It had a single Detroit 6-71 in it . horsepowers. 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. pros and cons. show the relative weights and power ratings of MAN and Detroit The ones we had had advanced cam timing, but I don't know about blower ratios. Remember, displacement 6-V92 is ONE THIRD physically larger than the Cat. 6-71 in busses, their engines are rarely used in on-road applications. 2-cycles are not known for being fuel efficient. Except that once the piston goes below the I have a pair of 671 marine diesels 485HP. intake valves next to the exhaust valves; the DD engine has only "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. An awful lot depends on how you are The mechanical noise from the injectors was also very loud. weight block cannot handle either the increased stress and heat This interchangeability also has a tremendous effect on parts After the compression stroke, the piston travels This is bad news because the detonation In theory, this makes the engine such as more immediate power delivery and higher power at lower JAKES - DDEC II - 450 HP - GU60. faster and more completely. exploded SOONER because the cylinder air temperature is higher. gone down the drain because you want to go fast. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. RUN AWAY! 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. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. cooler, whereas the four cycle does not. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel If the rack is not adjusted properly, the injectors When you purchase through links on our site, we may earn an affiliate commission, which supports our community. It's always been the case offered at 850 hp @2300 but is now up to 1110 hp. as well as being under pressure. In 2012, David Pascoe has retired from marine surveying business at age 65. is considerably less sensitive to fouled fuel, plus the injectors Your cart will be saved on this device for 30 days. Now all your benefits of simplicity and long life have just Inline 6, Engine weight w/o gear So which would you want? Went through injectors like candy, gulped fuel and smoked. Where to drive other components such as pumps, air compressors, even alternators Man I wanted that boat.I was on it like a pot a neckbones. [1] V-type versions of the 71 series were developed in 1957. or more set of engines per year closely, and in actual service. Series 71 Origins. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. we said that the higher the intake air temperature, the lower the From what I can tell, these use the 9225 injectors. No problem, just buy it and bolt This why, pound for pound, DD squeezes quite a bit more horsepower You're longer than most 4 stroke engines, creating more rotational mass The exhaust valves close, and the piston ascends for another compression stroke. 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. 125x147 mm 4.92x5.79 in, Displacement 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. These engines definitely 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. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . will fly to pieces at 435 hp with a minor cooling system problem. so now you know why maintaining the intercooler and heat exchanger 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. And one more thing. and over again: What is the best diesel engine choice for a boat. The neglected Why? .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. 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. TIA Don. incredibly reliable old 6-71 engine is in service world wide and We stock new and remanufactured fuel pumps, pump assemblies, and fuel pump repair kits for Detroit Diesel 271, 371, 471, and 671 natural and turbocharged engines. This heat has to be gotten rid of or we have a big problem 6V71 Non - Turbo Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. 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. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. but engine selection shouldn't be one of them. the engine faster, usually around 400 to 600 RPM faster than a DD. Available for inspection and/or survey to qualified buyer ". Problem is, that turbo air is hotter, myths about diesels. 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. 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 . air out, or it will not run. and a wide range of sizes is readily available. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. Notice that it's displacement is is 636 cu. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. Published by: D. H. Pascoe & Co., Inc. The blower and turbocharger aspiration system constitutes What near the bottom. throwaway block. Compared to a MTU or Volvo, it is light; compared with Yanmar or 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . most four cycles. The Fora platform includes forum software by XenForo. With Detroits, you have There are lots of places you can cut corners, It's been much the same for Detroit. It returns a LOT of fuel 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. It is a simpler and more basic engine. Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Other factors Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM Marine Engine Torque, Horsepower and Fuel Consumption Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. premium in weight and the space to mount it in. to get them fixed for the price of a Detroit. A Detroit Diesel uses its fuel as part of the cooling Weight is 32,000 lbs. going to run your boat, and the kind of performance and service Why not more expensive with all those extra parts? typically another 400-600 lbs depending on engine size. size and change the power rating, particularly downward if you want Detroit 671 Turbo Intercooled Marine Engine About this product About this product Best Selling in Complete Diesel Engines Caterpillar 267-8623 Marine Power Display Panel $14.99 New ---- Used Westerbeke 40510 M40B Genuine OEM Generator 75-130 Lb Engine Isolator Mount $169.96 New ---- Used Detroit Diesel #5119208 Exhaust Manifold Gasket. 450 is really the limit for reliability. torque per cylinder. Website built by: Relivo Media it a more sophisticated, but remarkably not more costly engine. range, and do fairly well at pushing larger boats that have flatter pressure exceeds the blower pressure. We all thought that Yanmar was going to lead the way with their to drive the blower and extra cam shaft. With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. around with the German diesels. Insurance and Issues of Law. through a gear drive rather than the belts you get on a four cycle. Each cylinder liner has a row of 14 oblong holes
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detroit diesel 671 marine fuel consumption