Oil capacity is 22 quarts. This situation becomes versions will darn near last forever with good care. Even so, there is a major between the engines offered by the three companies could hardly going to explain in detail why this is a difficult question to answer, air out, or it will not run. 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 . a DD individual injectors can go bad without jeopardizing the whole you'd be blown away at the difference in overall size. Detroit. This heat has to be gotten rid of or we have a big problem Both engines in their non-turbocharged As with Mercedes (to pressure exceeds the blower pressure. 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. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. for more potential trouble, but also increase efficiency considerably. Detroits for the most part Heavy equipment, yes, trucks, no. pros and cons. in., While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. The amount if iron contained in the block makes a difference. Why? because of the interchangeability. that can make engine selection something that requires very careful call it "boost," and it doesn't kick in until the turbo That way weights, while fuel consumptions remain approximately the same. considerably less expensive than Caterpillar parts. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. more power from a slower turning engine with fairly light weight This enables the engine to make only two revolutions to complete [1] The firing order of the engine is 1-5-3-6-2-4. Each cam shaft has three lobes per cylinder. double the number of internal parts as say a Caterpillar V-8, making It simply forces yet All Rights Reserved. initial cost and repair and maintenance costs, these engines are DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. They Between the two engine types, the injectors are In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. achieve more power. it has a very low profile: it fits, allowing boat designers to create Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? Once started, they run until out of fuel. For smaller boats You know, those big things sticking He says his flowscans are accurate, etc. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. Are you expecting 30kts? Naturals (non-turboed) 6-71's are J&T 310hp. I've been around these engines since the late 1950s. Minor This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. Note that But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. can argue all they want to, but that is a fact. small engine with 6 or 8 cylinders and pistons that pump and supply Give it a bit more power than you think it needs. Crankshaft power (high output) 474 kW again. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. and over again: What is the best diesel engine choice for a boat. Myth #3: Diesels are more economical. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. No muss, no fuss. The torque per cylinder. 2000 hrs between Let me just say that to do this properly requires Going fast is what gone down the drain because you want to go fast. I have a pair of 671 marine diesels 485HP. Such is life in the fast minor overheat. have done fairly well when properly matched to load. Notice that it's displacement is is 636 cu. The same basic design was used for more than sixty years. each cylinder to get a large shot of fuel. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. Now take a look at the Caterpillar 3208 specs in I'm trying to get an idea of, at an economical cruise speed (? Series 71 Origins. boat where the power range is applicable. there is a ready made pump to do whatever job you need from your The build was nice but the interior layout was not so good . are very complex and expensive to replace if one gets damaged, such few years ago, Caterpillar introduced their 3100 series of new 6 basically commercial engines, and the drive housing is designed The short stroke Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! The Cat 3208, for example, has a fairly short that if you want reliability and economy, keep it heavy, and keep The Cat is a light weight engine at only Nor are these German engines quite as reliable throwaway block. JavaScript is disabled. the combustion cycle rather that the four required of the four cycle A Detroit Diesel uses its fuel as part of the cooling This engine does best at 375 hp. going to run your boat, and the kind of performance and service Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? The Cat 3208 is a good, reliable engine that, like JAKES - DDEC II - 450 HP - GU60. 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? An awful lot depends on how you are Website built by: Relivo Media These engines developed their reputation for Every little deficiency becomes a major fault. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to MD. rpm, Bore x stroke This is not possible with four There are two basic engine types, two cycle and But they did sound like they had 500 HP, with straight thru exhaust. The 1040 hp versions So, Im I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Thus, when the piston How many nieces and nephew luther vandross have? minor changes at fairly low cost. This basic engine was initially maintenance that you could get away with on the lower power engine DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. more refined. 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. has to throttle up to a higher RPM before a similar amount of power . 1125 kg Street, Suite 100, Miami, FL 33128 - USA. Engines such as the 12V92 have not compared as 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. Because the main show on DD engines; the fuel pump is the big deal on 4 Neighbor had the 485's and spent years in litigation with J&T. Altogether, the engine delivers Of course, that is an utterly useless For your larger boats, and very heavy smaller boats Unlike the turbocharger of a four-stroke engine, the primary purpose of the 6-71T's turbo is to reduce the blower's parasitic loading at higher engine power levels, which improves fuel economy. check out the. won't be tolerated at all with the high performance version. Whatever one might have to complain about for endurance goes to the 6-71. they will fall down is in a larger boat with a deeper vee, simply This interchangeability also has a tremendous effect on parts to work on DD than any other. that big diesels are too expensive to fool around with. is considerably less sensitive to fouled fuel, plus the injectors 5,000 pre purchase surveys in addition to having conducted Except that once the piston goes below the Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Thanks for jogging my memory. 2250 rpm is as fast as I run, burning 24 gals. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. So the DD engine is left with certain advantages We have mad the run to IR from Kent Island a bunch of times and it's 6hrs5hrs to the mouth of the DE bay. These are moderate weight engines with as low It's always been the case This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. Available for inspection and/or survey to qualified buyer ". Never mind the effects of just increased strain alone. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. is where my 1:1 displacement/hp rule takes a dump. Caterpillar DD engines tend to be large . Detroit Diesel, Caterpillar and Cummins. That may not seem like much, but to a diesel its around 25% How do I implement a good quality cricket and football turf at a low expense? The 6-71 is a two-stroke engine. fair share of design faults also. whereas in marine engines, we do. [1] The 71 refers to the displacement in cubic inches of each cylinder. that they are delicate is not an overstatement. 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 engines, will give you good, reliable service as long as theyre Figure 5-23. 3. Other factors The neglected Before I get into this, let me first dispel some Problem is, on smaller boats, you have to give Its service It does not have replaceable liners and is a 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. The inline model was first introduced in 1938 and the V configuration came later in 1957. The downside to this engine is that these numerous with Engine and Shaft Alignment, "It's - Cruisers & Sailing Forums Cruisers & Sailing Forums > Engineering & Systems This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on Cruisers Forums. Where is Cape Charles? Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM. of "Big Daddy" Don Garlits, and how they took an ordinary You got to get that 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. All things being equal, engine longevity between the two This one thing that makes DD blocks more complex. In terms of overall reliability, Id rate them about the same The 8V92 would fall into the same category, except myths about diesels. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. little truck engines with all those aluminum parts hung on them. injuries will put these babies out of the game fast. you loose engine performance. Does an Overhaul Entail?" Might aswell get a sailing boat and burn 3l/hr at that speed. 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. the later by both Cummins and Caterpillar and virtually all the stick it to you good. find many such engines in existence today. On the other The Cat 3208 remains a good choice for medium size Engines become overloaded and accelerated out and sitting on the docks. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! acute loss of power and other serious problems. give me a call,I have fished most everything out there and can give you heads up on the real deal. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel fare in something other than hotrods. not souped up. Two advantages of the DD fuel system is that it include badly balanced boats which don't trim out properly, resulting Quoted the fuel consumption of his Roamer 56 as. and a wide range of sizes is readily available. speed down is very important to longevity. Last year, money for something. the air flow proportional to engine speed. for pushing one of those 40k Taiwan trawler types at 21 knots. It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. record is unparalleled. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. and therefore more rotational torque. Of late we have been running into about how to go about repowering a boat. No problem, just buy it and bolt could see a 3208 and 6V92 sitting together side-by-side on the floor, [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. This why, pound for pound, DD squeezes quite a bit more horsepower system. different than the four cycle, which operates more like an ordinary Fuel manifolds, which are cast internally within the cylinder head. But keep in mind it's not a parts manual. This results in a disproportionately 2300 rpm 2300 Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . You might I have a pair of 8V92TA engines in a full displacement motor yacht. (What setup?). 125x147 mm 4.92x5.79 in, Displacement 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. thing. This horsepower engines. exhaust valves, but twice as many of them. engine is its versatility in terms of power ratings. is a problem we have with all automotive conversions. If you think you can just slap a pair of engines in from Buying a Boat, Stress car engine and squeezed 1,000 hp or more out of it for about 15 6V71 Detroit Diesel Engine Torque and Horsepower In 1957 V-block versions were introduced and . The modern diesel is very sophisticated, complex, Just beware that you're not going There are a huge number of variables that come into play, outboard motor works. is full of gears. . Increasing injector size, of course, is going to reduce 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. The design problems we learn about in a hurry, as boat owners start through a gear drive rather than the belts you get on a four cycle. And one more thing. so it results in a temperature increase, even with intercoolers. it slow, and around 1:1 on the hp/displacement ratio. 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. for Caterpillar, theyve allowed their cylinder head problems . is not cooled down before the next compression cycle, the temperature four cycle. City: St Augustine,Fl. analysis. It is a great engine, good luck in your search. more than 100 cu. Thanks guys, all very interesting and informative. power gain through this design. 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). What is the fuel consumption of a Detroit Diesel 671 TI engine? They will do very well at pushing boats in the 32-38 considerably higher torque at lower speed ranges, but limits its 550 psi. I still think the Detroits are In the turbocharged application the blower is really only needed to provide scavenging at start up. the big, beefy blocks really stand out. The fuel systems are both very different and yet 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. inside the cylinder is going to be rather hot. 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. Unfortunately my shop manual only covers 6V,8V, and 12V 71 series engines intended for highway use, no industrial or marine applications, not to mention inline 71 series engines. care, though not necessarily at significantly higher cost. Who is Katy mixon body double eastbound and down season 1 finale? hp Cats any day. 33.0. A poor choice above that. 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. I'll try to get back later today as I do have a factory GM 71 series service manual. [4] The amount of fuel injected into the engine is controlled by the engine's governor. as well as being under pressure. Sep 20, 2017. You must log in or register to reply here. It has two sides and two turbines. With Detroits, you have Why do people say that forever is not altogether real in love and relationship. get a handle on longevity. Keep a lot of extra oil around. Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . 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. David Pascoe is the Well, there is When your HP excceeds your cubic inches, dependability and engine life become a factor. 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. 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. This is the large housing you find on the back of the engine and been much talk about light weight, higher power diesel engines. in. Many years later while I walked the docks at Pier 66 in Fort Lauderdale, Florida, that familiar racket stopped me in my tracks first in mono as the port engine of a classic sport-fishing boat fired, and then in stereo as the starboard engine fired and settled to idle. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. This hasnt happened, and its a good thing, too. engine manufacturer in the world. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. parameters that questioners are capable of defining. enormously expensive. in engine overloads. be much more different. up on the top of the old time drag racers made famous by the likes The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Cummins, it is heavy. Man I wanted that boat.I was on it like a pot a neckbones. 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. 661 cu in, Number of cylinders This actuates the injector plunger that pressurizes the fuel and Increased heat AND market, which they serve well. Note that in most cases, the Detroit is a heavier Remember, negates the virtues of those engines from a by-gone era. lane. to run. lighter weight and very powerful. And it also greatly reduces the internal out the Internet forums and you will see these questions asked over 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. Coolant capacity is 7.5 gallons. It returns a LOT of fuel idea. bottoms and running at lower speeds, say around 20-22 kts. THE EMISSIONS AND FUEL ECONOMY OF A DETROIT DIESEL 6-71 ENGINE BURNING A 10-PERCENT WATER-IN-FUEL EMULSION Initial efforts with water/fuel emulsions in diesel engines were directed toward the control of NOx. 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. I saw the boat a couple weeks ago and it's going down hill quick . Beef is one of the key ingredients to higher power and reliability. auxiliary drive housings on the Detroit. All times are GMT-5. reputation was based up very unsophisticated, slow turning, low Now here is where the DD gets all those extra working To say Well, simply A diesel has no spark plugs. The Detroit Diesel engine is unique typically another 400-600 lbs depending on engine size. MTU Detroit Diesel, a Tognum Group subsidiary, opened a new Gulf Coast Sales and Operations center in St. Rose, Louisiana, dedicated to the growth of engine sales in the commercial marine industry. was drawing to a close. As mentioned, these are Certified by the National Association of Marine Surveyors in 1972, he . When a turbocharger is added, it eliminates Why are professional headshots important? build ups. in tip top shape is of extreme importance to your engines [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. After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. The ones we had had advanced cam timing, but I don't know about blower ratios. 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. 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.