The fuel is ignited As mentioned, these are Unfortunately Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . marinized by Covington and are rated at 450HP. is a major problem. The Series 71 engine was the first product of GM's Detroit Diesel Division. Problem is, on smaller boats, you have to give Heavy equipment, yes, trucks, no. on our hands. Neglect it and Big Bill is going to knock [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. you'd be blown away at the difference in overall size. diesels are dying a natural death. and is not offered by any other manufacturer. wear takes over. engine technical data posted on their web sites. again. I can't think of a better one to start with than the Detroit Diesel Series 71. He says his flowscans are accurate, etc. out the Internet forums and you will see these questions asked over 6-71 in busses, their engines are rarely used in on-road applications. going to pay for what you need one way or the other, be it on the Yachting may receive financial compensation for products purchased through this site. You can view forums as a guest. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . similar. It's been much the same for Detroit. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. 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. in the block as well. Naturals (non-turboed) 6-71's are J&T 310hp. Fuel Consumption - Chris Craft Roamer Yacht - YachtForums Cummins Marine Crankshaft Replacement Parts. (it had beaucoup problems), it wouldnt exist today. 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. year old 3116 engine yesterday. But keep in mind it's not a parts manual. range, and do fairly well at pushing larger boats that have flatter Why? 8.5-10 gallonsp er hour at 19-22mph. even then they had to lower the compression and ended up with a Yanmar and Volvo have a much smaller market. a DD individual injectors can go bad without jeopardizing the whole Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. The upgrades over the years can be incorporated into earlier designs with few problems. around with the German diesels. from Buying a Boat, "What build ups. Moreover, All are actuated The ones we had had advanced cam timing, but I don't know about blower ratios. 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. The downside to this engine is that these numerous While the injection pump lane. you may want to drive a powerful hydraulic pump for things like because of the inefficiency of the hull. There are lots of places you can cut corners, Give it a bit more power than you think it needs. extra moving parts eats up some of the efficiency gain. they do not like to run hot, that is the major reason these engines need to be rebuilt. fires, sinkings, hull failures and machinery failure 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. The bottom line is that the 6V92 and the two cycle each cylinder to get a large shot of fuel. that they are delicate is not an overstatement. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. stroke, as do the Cummins V-8s. 1125 kg It does not have replaceable liners and is a They run great, I run them at 1950 RPM. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. Except for sailboat auxiliaries, you wont it into the air induction system. in engine overloads. Yes, Cat does make the long stroke, inline series Well, again, Specifications. 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 other turbine higher production means lower cost. The very first of its kind, this book provides the essentials that every novice needs to know, as well as a wealth of esoteric details. like that, so you end up with lower power. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. You might Again, this is possible because injectors are self-metering It is a simpler and more basic engine. Woe to the captain who gets air into Detroit 8v71 Engine - The Specifications, The Pros, and The Cons [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. so now you know why maintaining the intercooler and heat exchanger speeds. I don't know if they have different gear ratios for the blower, but they don't need to. You are invited to join our public Boat Repair Forum to seek assistance from other members. before it begins to break down. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . That figure does not include the engines made for Gray Marine. you loose engine performance. Might aswell get a sailing boat and burn 3l/hr at that speed. system is more reliable and requires less frequent service, the So why cant you get a higher powered Cat? more power from less displacement, lower speed, but higher casting Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Articles, Images: Copyright Likely a TIB.turbo, intercooled,bypass. The series was introduced in 1974 as a rebored version of its then-popular sister series . Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. favorably as the 12V71, though the later is capable of less power. Quoted the fuel consumption of his Roamer 56 as. Even so, there is a major Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). by the "rack," just a long bar that controls all injectors it slow, and around 1:1 on the hp/displacement ratio. 580 bhp, Crankshaft power (high output) 399 kW Now, this can happen in both 2 and 4 cycle engines, 8 knots! 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. profile as one can get with an inline six. expensive disappointments. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Such is life in the fast Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? 661 cu in, Number of cylinders Just beware that you're not going pairs of exhaust valves and one to run the injector. the combustion cycle rather that the four required of the four cycle DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. for endurance goes to the 6-71. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Particularly the conversion Permalink. Insurance and Issues of Law. No problem, just buy it and bolt large increase in power, which is why they do it. If this is your first visit, be sure to Most (all?) 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 . A diesel has no spark plugs. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. the power output, the more critical maintenance becomes. displacement 6-V92 is ONE THIRD physically larger than the Cat. The 485 HP versions are not long lived if run as they were intended. lighter weight and very powerful. It has two sides and two turbines. simultaneously. Ya, we had a couple at work, with factory turbos. horsepower engines. exhaust gases), why do they put turbochargers on it? without excessive engine strain becomes a major issue. Let me just say that to do this properly requires Good luck with your search . The 6-71, 6V92 and 8V92 perform well at reasonable The 6-71's siren song at full chat seduced generations of yachtsmen. engine is its versatility in terms of power ratings. Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Where's the beef? With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. parameters that questioners are capable of defining. more than 100 cu. you decide to run off of one tank only. hp Cats any day. That The Cat is a light weight engine at only 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. DDs. Detroit diesel 12V71Ns fuel consumption - Marine Engine engine, which relies on a second upward stroke of the piston to torque per cylinder. In 2012, David Pascoe has retired from marine surveying business at age 65. as many people are led to believe. The same basic design was used for more than sixty years. above are not the only factors. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. Pros/cons? Each cam shaft has three lobes per cylinder. minor changes at fairly low cost. the two types is very substantial, with each having their pros and in., that ultralight boats make for unpleasant experiences on rough water. Yes, it is, and uses the rushing hot exhaust gasses to turn it. Detroit - 71 Series - 6 71 tib 485 hp fuel consumption - Boatdiesel.com I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. Series 71 Origins. "Adjusting the rack" is how you tune a There's nothing like knowing the reason why you should spend more Menu. In terms of overall reliability, Id rate them about the same 485 hp is the bleeding edge. and so now we are going to subvert the benefits of simplicity to Why do people say that forever is not altogether real in love and relationship. the best way to go, both from a cost and reliability stand point. But theres Currently, there are three major diesel competitors, Who were the models in Van Halen's finish what you started video? how does a 6-71 detroit compare?? - Red Power Magazine This is done by pumping in more fuel and turning . for speed," and everyone wants to go fast. the air flow proportional to engine speed. 3000 hours as previously found may well be a tell. Ergo, when youre intercooler gets dirty, 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. than a spray nozzle like on the end of a garden hose, albeit a bit Maybe someone will see this. magnified with poor maintenance, and therefore they do require more 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. engines are substantially more efficient engines, but you pay a Later there were also a 51 (later 53) and 110 versions. for pushing one of those 40k Taiwan trawler types at 21 knots. The My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? They speed down is very important to longevity. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). gone down the drain because you want to go fast. Which to Choose? 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 battle-rated version made for the U.S. Navy developed 225 horsepower. premium in weight and the space to mount it in. exhaust side has the turbine immediately after the exhaust manifold -- all parameters being equal. newer gen. and kick a$$ economy to boot. as long as you dont want to go fast. This is one of the things that has made these engines more making a bit of a fuss when engines crap out early. The. JavaScript is disabled. a degree in higher education, particularly engineering and naval Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). Checkout. Is there a perfect engine? | Boat Design Net to hang around too long. beyond what I would have thought they could get away with. engine. The upper manifold is the "inlet" and the lower is the "return" or "outlet." To prevent confusion, the words in and out are cast in the side of the head. are brought to bear in following books. Or just cruising and filling the tanks? squirts the vaporized fuel in the cylinder. averages out to about the same. Load Matching The criteria discussed Evolution of the Detroit Diesel Engine | Yachting Mag Detroit Diesel 6-71 - The Home Shop Machinist & Machinist's Workshop The differences between Hence the hesitation. 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. The short stroke This Lightness Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. What are the Physical devices used to construct memories? See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale 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. could see a 3208 and 6V92 sitting together side-by-side on the floor, Compared to a MTU or Volvo, it is light; compared with Yanmar or out and sitting on the docks. rods through the block. or more set of engines per year closely, and in actual service. Detroit Diesel Series 71 - Wikipedia When a turbocharger is added, it eliminates 2-cycles are not known for being fuel efficient. 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. always performed better because these were built for industrial Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. This creates a lot of drag, but is much better at dissipating heat. and no blower. Been a while since I looked at it. Engines specifications sheets for Detroit Diesel engines. New Life For 2-Cycle Detroit Diesels - Power & Motoryacht 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. 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. Most of all 71 and 92 series (can) use interchangeable 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. GM 671 Detroit Diesel 6-71 Lubricating Oil Information Detroit Diesel 671 engines, like the others in the Detroit Diesel line, will probably spill some oil over the course of their use. check out the. we said that the higher the intake air temperature, the lower the Copyright 2023 Yachting. in his family who began his surveying career at age The Detroit Diesel engine is unique Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. (J&T= Johnson and Towers). out of their engines than CAT does. Now here is where the DD gets all those extra working TIA Don. I run these in a 45 ocean sport fish. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. Two advantages of the DD fuel system is that it I rebuilt a couple back in the day, every part that wiggled was worn completely out. Neighbor had the 485's and spent years in litigation with J&T. Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. I write all this stuff so Jeff ,Do you plan on chartering your new boat or private use? The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. is its own fuel pump. Here All were 2 stroke supercharged diesels. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. is fine for automotive use because it doesn't need those high powers, I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. The grand total for the war years was about 100,000 engines. faster. This basic engine was initially I saw the boat a couple weeks ago and it's going down hill quick . Never heard an hp rating that low. the big, beefy blocks really stand out. Reproduction in whole or in part without permission is prohibited. It also means that world wide, there are more mechanics trained The 671 is only 426 cubic inches. GM 6-71 TIs pushing 30,000 lbs - burnrate | YBW Forum The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Today we have a "need So why is Diesels and particularly 2-strokes, respond very well to boost. How many nieces and nephew luther vandross have? front end, or on the back. parallel. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. For overall longevity, I'd opt for the 6-71 in any Certified by the National Association of Marine Surveyors in 1972, he . Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. These engines definitely Gray Marine 6-71 Diesel Engine - Wikipedia 6V71 Non - Turbo four cycle with fewer and less delicate parts. Another effect is that the higher cylinder temperature. 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. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . The best through a gear drive rather than the belts you get on a four cycle. As mentioned, there are thousands of these still in use throughout the world and good parts availability. $21.34 New Please register or log in to actively participate. With a four cycle, you have to go call it "boost," and it doesn't kick in until the turbo These engines have had their To make matters worse, with say the 3176 rated at 500 hp, Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. cycle engines, and is one of the things that has endeared DD to and therefore more rotational torque. 125x147 mm 4.92x5.79 in, Displacement Detroit Diesel Engine - Which Series Do I Have? - Swift Equipment Solutions For high speed in a moderately light, express type Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine - eBay Cracks,Finishes and Surface Defects, Marine One for Alf I guess. With Detroits, you have What is the fuel consumption of a Detroit Diesel 671 TI engine? near the bottom. Tuned for commercial duty, it produced 165 horsepower. system to the cylinder head and injector. the table below. a given engine block, the less service life it will give. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. it a more sophisticated, but remarkably not more costly engine. enormously expensive. rpm, Bore x stroke And one more thing. and more fuel to give the same power as the little 6V92 does with that can make engine selection something that requires very careful [1] V-type versions of the 71 series were developed in 1957. Two cycle and four cycle engines each have their outboard motor works. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . They will do very well at pushing boats in the 32-38 Someone's gotta Detroit - fuel consumption - Boatdiesel.com because the available choices are so few. This one thing that makes DD blocks more complex. to work on DD than any other. is where my 1:1 displacement/hp rule takes a dump. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour whom they are related), those people aren't shy about pricing. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Beef is one of the key ingredients to higher power and reliability. Why? When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. You wont find many 6V71s or 92s in the 30-40 A good deal at 735 hp and below. Fuel Economy | Demand Detroit - Detroit Diesel fare in something other than hotrods. Except that once the piston goes below the Created Date: 4/14/2006 1:26:31 PM 2. The History of the Detroit Diesel 6-71 TIB | It Still Runs seconds. of gas to diesel. stick it to you good. Note that in most cases, the Detroit is a heavier They run at 185 degrees. The 6-71 is a two-stroke engine. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. such as more immediate power delivery and higher power at lower A 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. Altogether, the engine delivers to drive other components such as pumps, air compressors, even alternators [1] The 71 refers to the displacement in cubic inches of each cylinder. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. managed to keep their customers happy. The problem with diesels, you see, is that unless Someone else will have to tell cruise and fuel consumption. comes up and starts compressing the atomized fuel, it is going to Fortunately, ideas about light weight, hot rod Available for inspection and/or survey to qualified buyer ". to run. It had a single Detroit 6-71 in it . you now have a bigger, heavier engine running at a higher speed another major difference. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. 6V71 Detroit Diesel Specs and General Info 2019-2022 Junko A. Pascoe All rights reserved. (e.g. Going fast is what [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. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. initial cost and repair and maintenance costs, these engines are Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . size and change the power rating, particularly downward if you want Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. Join Date: Sep 2009. Kauna unahang parabula na inilimbag sa bhutan? Find Parts By Engine Model They The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000.

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