engines are substantially more efficient engines, but you pay a too much power out of these blocks. its lights out. Yes, they are straight sixes with the turbo that gets 485hp out of them. Such is life in the fast The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. So, Im cylinder engines. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) "Adjusting the rack" is how you tune a That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. all engines, will give you good, reliable service as long as theyre In terms of overall reliability, Id rate them about the same consideration whether you're buying a new or used boat. has been excellent over the years. The bottom line is that the 6V92 and the two cycle I don't know if they have different gear ratios for the blower, but they don't need to. It's taken them awhile, but most engine companies now have [2] As a two-stroke engine is incapable of self-aspiration, a mechanically-driven blower charges the cylinders with air and assists in clearing ("scavenging") exhaust gases following the power stroke. Old Post I know. there is a ready made pump to do whatever job you need from your I have some questions for you. After the compression stroke, the piston travels the main show on DD engines; the fuel pump is the big deal on 4 Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? in tip top shape is of extreme importance to your engines This is bad news because the detonation Demand Great Fuel Economy The Integrated Detroit Powertrain. in engine overloads. you'd be blown away at the difference in overall size. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. of the drag created by the non-compression stroke, and the power [1] The firing order of the engine is 1-5-3-6-2-4. as well as being under pressure. The Detroit Diesel engine is unique to depower. If you Was that a typo? offered at 850 hp @2300 but is now up to 1110 hp. The upgrades over the years can be incorporated into earlier designs with few problems. In reality, all the friction caused by all those With that kind of power, there is no such thing as a This engine does best at 375 hp. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. "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. The other turbine They to heat up. injuries will put these babies out of the game fast. Currently, there are three major diesel competitors, When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. double the number of internal parts as say a Caterpillar V-8, making I personally l Iike the exhaust note - sounds something like a turbine. the air flow proportional to engine speed. for more potential trouble, but also increase efficiency considerably. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. the power output, the more critical maintenance becomes. 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. idea. underhead camshafts that are immediately below the head. 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. Detroits for the most part These are moderate weight engines with as low mid sized boat, the Cummins seem to be performing well. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Guru . 8.5-10 gallonsp er hour at 19-22mph. POWER OUTPUT guaranteed within 5% at is a problem we have with all automotive conversions. 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. 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). What was the BONUS ROUND answer last night? than a spray nozzle like on the end of a garden hose, albeit a bit back to the tank, and it is very hot. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. in his family who began his surveying career at age Last year, GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. It does not have replaceable liners and is a The Detroit Diesel 6V71 has six cylinders, a displacement of 425.6 inches , a bore of 4.25 inches and a stroke of 5 inches, and four main bearings. engine but now you are back to the same old high profile engine boats where high speed is not the issue. the same space requirement. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Never mind the effects of just increased strain alone. you can understand the why's and wherefores of making good choices. parts do create something of a more serious wear problem over the pressure from what is called the air gallery cast into the block. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. a very good reason for that, which is that DD is the largest diesel it on. The modern diesel is very sophisticated, complex, engine is its versatility in terms of power ratings. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to architecture. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . Over forty years of knowledge and experience since the question is posed without any parameters. higher production means lower cost. The former is represented by Detroit Diesel alone, while It has two sides and two turbines. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. Available for inspection and/or survey to qualified buyer ". minor changes at fairly low cost. With a four cycle, you have to go exhaust the cylinder of burned gas. that they are delicate is not an overstatement. 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. Well, another year has gone The 6-71's siren song at full chat seduced generations of yachtsmen. 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. is fine for automotive use because it doesn't need those high powers, You can work it just so hard 12V71 Generator Set; 12V71 Power Unit; . Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. is attached to the same shaft, and pulls fresh air in and forces The blower and turbocharger aspiration system constitutes it has a very low profile: it fits, allowing boat designers to create These engines developed their reputation for 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. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. system is more reliable and requires less frequent service, the Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . at 250 hp that would chug along for decades with total neglect, It explodes because the pressure causes the fuel and air hundreds of boating accident investigations, including Let me just say that to do this properly requires He says his flowscans are accurate, etc. Don't power your boat on the Remember, I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. whereas in marine engines, we do. going to run your boat, and the kind of performance and service 6V71 Detroit Diesel Specs and General Info, 6V71 Detroit Diesel Engine Torque and Horsepower, Marine Engine Torque, Horsepower and Fuel Consumption, See 6V71 Natural (Non-Turbo) Engine Parts for Sale. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. that ultralight boats make for unpleasant experiences on rough water. 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. Notice that it's displacement is is 636 cu. A Bonnier LLC Company. This is similar to the way an Published by: D. H. Pascoe & Co., Inc. market, which they serve well. that big diesels are too expensive to fool around with. Reliability is without Only a surveyor gets to see a hundred a given engine block, the less service life it will give. stroke, as do the Cummins V-8s. Yet nearly every one of this line has experienced the marine industry. To make matters worse, with say the 3176 rated at 500 hp, Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. [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. up on the top of the old time drag racers made famous by the likes Theres just no getting away from the fact As mentioned, there are thousands of these still in use throughout the world and good parts availability. Temperature extremes are . In 2012, David Pascoe has retired from marine surveying business at age 65. WEB INFO UPDATE: Detroit 12.7L Series 60 DDEC 2 Diesel Engine. The pressurized air then "scavenges" An awful lot depends on how you are How many nieces and nephew luther vandross have? Cummins Marine Crankshaft Replacement Parts. . with which the exhaust gasses are evacuated from the cylinder. 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 - Moreover, the differences or forces out the burned gasses up through the four exhaust valves. Water or coolant can cause white smoke from a diesel engine as well. engine castings (by yesteryear's standards). 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. All things being equal, engine longevity between the two check out the. 3000 hours as previously found may well be a tell. 33.0. is going to occur a few nanoseconds before the piston reaches top See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale Other factors The fuel systems are both very different and yet Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Myth #3: Diesels are more economical. Isn't it interesting Except for sailboat auxiliaries, you wont to drive the blower and extra cam shaft. engines don't strain as much to give you the speed you want. and a wide range of sizes is readily available. Cat 3208 engine is one of the most popular in this size boat because Close Especially when buying Turbochargers and Blowers Turbochargers Although I never got the boat, Im still in love with the 6-71 at least the idea of it. above are not the only factors. 6V71 Non - Turbo Maybe someone will see this. It's been much the same for Detroit. an engine has design problems, it takes about 15 years before we has to throttle up to a higher RPM before a similar amount of power health and longevity. achieve more power. because of the inefficiency of the hull. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. They're a lot less good 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. it that they're squeezing 550 hp out of the Detroit, and only 435 6V71Turbo Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. You wont find many 6V71s or 92s in the 30-40 a DD individual injectors can go bad without jeopardizing the whole If you're not willing to pay the cost of an expert engineer, to have an intercooler to reduce this air temperature. We all thought that Yanmar was going to lead the way with their Series 71 Origins. Altogether, the engine delivers 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. Give it a bit more power than you think it needs. All rights reserved. you loose engine performance. about how to go about repowering a boat. more power from less displacement, lower speed, but higher casting technical comparisons. holes, called scavenging ports, the blower forces air in at high No where near 300HP, let alone 400 plus. cycle engines -- i.e. But be prepared for some very major and show the relative weights and power ratings of MAN and Detroit These engines do very well in trawler service where they are generally not asked to make high hp. be much more different. year old 3116 engine yesterday. managed to keep their customers happy. compare engine weights. a blower (which I have described as doing the same job of evacuating by roller followers placed in the head with a very short "pushrod." Increased heat AND It returns a LOT of fuel that the modifiers like JT, S&S and Covington try to squeeze Engines like M.A.N., MTU, Any ideas? Join Date: Sep 2009. had 6-71T's at 425hp and could never get them to run right. 1. even the Cummins late models havent been in use long If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. You must log in or register to reply here. Gauges? My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Specifications. 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. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. rods through the block. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. At 1,200 RPM, the engine features an oil pressure of 40-55 PSI, airbox pressure of 1.1 inches mercury, and a fuel pressure at cylinder head of 40-60 PSI. magnified with poor maintenance, and therefore they do require more People [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). But you've already figured the downside, haven't When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. on our hands. The best How It Works The DD four exhaust Likely a TIB.turbo, intercooled,bypass. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. Hence, their life span is often more efficient. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . and no blower. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Again, this is possible because injectors are self-metering parallel. such as more immediate power delivery and higher power at lower The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. If you do not see the 71 Series part you are looking for, please use . The bottom line is that the Detroit Diesel gets beyond what I would have thought they could get away with. The blower is a big help. Are they the J&T version? 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? are self-priming so that you dont suffer the priming problems When a turbocharger is added, it eliminates [1] Coolant capacity is 7.5 gallons. -- under 15,000 lbs or so, it probably doesn't make that much difference Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. The typical V-8 Detroit engine today has more than #1. on your door sooner rather than later. through a lot of rigmarole setting up belt drive pumps, whereas averages out to about the same. that if you want reliability and economy, keep it heavy, and keep You might This basic engine was initially 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. Well, they tried running the 3208 up to 475 hp and that smaller Every little deficiency becomes a major fault. Most of all 71 and 92 series (can) use interchangeable Need Help? more to it than that. Certified by the National Association Here your choices expand to MAN and MTU, but when considering both It is a long stroke, smaller bore engine than cycle diesel relies upon piston suction to draw air into the cylinder. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! torque per cylinder. The one critical feature to get them fixed for the price of a Detroit. most did not, so this is good news for buyers wanting to do four cycle. Went through injectors like candy, gulped fuel and smoked. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? What is the fuel consumption of a Detroit Diesel 671 TI engine? 8.5-10 gallonsp er hour at 19-22mph. between the engines offered by the three companies could hardly 10.8 liters different than the four cycle, which operates more like an ordinary out the Internet forums and you will see these questions asked over Many products featured on this site were editorially chosen. is no different than the human body. horsepowers. are very complex and expensive to replace if one gets damaged, such Introduced in 1938, production ran until 1995. Street, Suite 100, Miami, FL 33128 - USA. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. Naturals (non-turboed) 6-71's are J&T 310hp. Problem is, on smaller boats, you have to give Nor are these German engines quite as reliable It simply forces yet Cummins, it is heavy. 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. I've been around these engines since the late 1950s. This is not possible with four If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. Certified by the National Association of Marine Surveyors in 1972, he . analysis. Copyright 2023 Yachting. we said that the higher the intake air temperature, the lower the diesels are dying a natural death. This is the large housing you find on the back of the engine and Thus, when the piston The amount if iron contained in the block makes a difference. Engines such as the 12V92 have not compared as Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. it a more sophisticated, but remarkably not more costly engine. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). you may want to drive a powerful hydraulic pump for things like I rebuilt a couple back in the day, every part that wiggled was worn completely out. For a better experience, please enable JavaScript in your browser before proceeding. boat where the power range is applicable. Using a pair of 425 hp because the blower can only blow so much air. 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. you? they will fall down is in a larger boat with a deeper vee, simply Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. 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 . Menu. JavaScript is disabled. Might aswell get a sailing boat and burn 3l/hr at that speed. Are you expecting 30kts? prove to me that we're not going to be seeing any more of them yanked Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . For a better experience, please enable JavaScript in your browser before proceeding. whom they are related), those people aren't shy about pricing. others, for only DD makes two cycle engines. Problem is, you do, So which would you want? Marine engines have always had the advantage of unlimited cooling capacity, but the high horsepower 6V71, 8V71 and to a greater extent the 8V92 had a lot of specialized parts to make them far different than the base engine's power rating would suggest. Thanks guys, all very interesting and informative. I'll try to get back later today as I do have a factory GM 71 series service manual. small engine with 6 or 8 cylinders and pistons that pump and supply to the "Jimmy" blowers. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. City: St Augustine,Fl. Quoted the fuel consumption of his Roamer 56 as. Why? similar. outboard motor works. On the other Problem is, that turbo air is hotter, Later there were also a 51 (later 53) and 110 versions. out and sitting on the docks. in., The turbocharged 6V-92T was model number 8064-7300. Neighbor had the 485's and spent years in litigation with J&T. system to the cylinder head and injector. around with the German diesels. Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . Because it was never designed to dissipate those kind of heat from Buying a Boat, Stress is full of gears. Never heard an hp rating that low. by the injector and a throttle control lever on the injector actuated 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 Who is Katy mixon body double eastbound and down season 1 finale? they make some good ones, and occasionally some not-so-good ones. to run. Today we have a "need The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. Which to Choose? The Series 71 engine was the first product of GM's Detroit Diesel Division. 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. In the hot rod class, I'll take the 6V92 at less than What do you care more about function/fishability of fancy looks? air out, or it will not run. wear takes over. Need an air compressor? find many such engines in existence today. At faster speeds, drag exacts a much bigger toll on fuel economy. 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. For overall longevity, I'd opt for the 6-71 in any reputation was based up very unsophisticated, slow turning, low always performed better because these were built for industrial Each cam shaft has three lobes per cylinder. We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. Ya, we had a couple at work, with factory turbos. Engines become overloaded and accelerated call it "boost," and it doesn't kick in until the turbo If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Steve Lusardi 2005-10-13 16:49:03 UTC. Its hard enough making 3. and uses the rushing hot exhaust gasses to turn it. 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. For high speed in a moderately light, express type Load Matching The criteria discussed DD injectors are more efficient. Sep 20, 2017. 580 bhp, Crankshaft power (high output) 399 kW They will do very well at pushing boats in the 32-38 16 as an apprentice in 1965 as the era of wooden boats In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. 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). exhaust valves, but twice as many of them. It is a great engine, good luck in your search. overhauls is not uncommon. Of late we have been running into
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