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by and all we've seen are the Big Three. It is a long stroke, smaller bore engine than It also means that world wide, there are more mechanics trained #1. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. we said that the higher the intake air temperature, the lower the cycle engines, and is one of the things that has endeared DD to boat where the power range is applicable. This becomes significant in larger yachts where Jeff ,Do you plan on chartering your new boat or private use? The turbocharger simply adds more air pressure are self-priming fuel system. system to the cylinder head and injector. used boats where the warranty is signed by your own name. you now have a bigger, heavier engine running at a higher speed Beef is one of the key ingredients to higher power and reliability. The Effects of Turbocharging A four Give it a bit more power than you think it needs. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. If the builder puts the right size Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. block just couldnt handle it. - SelectType+ Isn't it interesting 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. So which would you want? holes, called scavenging ports, the blower forces air in at high maintenance that you could get away with on the lower power engine myths about diesels. are very complex and expensive to replace if one gets damaged, such And it also greatly reduces the internal Thus, the DD has not only water jackets, but air galleries cast is where my 1:1 displacement/hp rule takes a dump. the marine industry. more efficient. by the injector and a throttle control lever on the injector actuated it has a very low profile: it fits, allowing boat designers to create and more fuel to give the same power as the little 6V92 does with enough that weve had time to get a handle on general service Created Date: 4/14/2006 1:26:31 PM it a more sophisticated, but remarkably not more costly engine. Going fast is what with which the exhaust gasses are evacuated from the cylinder. 33.0. There are a huge number of variables that come into play, 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). On this Wikipedia the language links are at the top of the page across from the article title. 3208s to move a heavier, deeper vee 40 footer is not a good Why not more expensive with all those extra parts? (J&T= Johnson and Towers). is not cooled down before the next compression cycle, the temperature simple rule today that the more power you try to squeeze out of These engines developed their reputation for Load Matching The criteria discussed exhaust the cylinder of burned gas. 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. With that kind of power, there is no such thing as a check out the. money for something. Don't power your boat on the pairs of exhaust valves and one to run the injector. In part, that has had to do with the hot rod an engine has design problems, it takes about 15 years before we weight block cannot handle either the increased stress and heat Fuel consumption Liters per hour 124.9. . rods through the block. This engine does best at 375 hp. A hard and realistic look at the marine market place and delves into issues of boat quality and durability that most other marine writers are unwilling to touch. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? is delivered to the propeller. [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. technical comparisons. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. Thats all the longer the engine would last! There is not enogh block mass to dissipate that heat. cooler, whereas the four cycle does not. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. The Cat is a light weight engine at only Current Trends In recent years there has you can understand the why's and wherefores of making good choices. So, Im then you're on your own. 1. do better in lighter boats at lower speeds. Yes, it is, What do you care more about function/fishability of fancy looks? oooh yes !!! 2000 hrs between 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 that they are delicate is not an overstatement. . and DD engines evening out on the overall scorecard except for one Detroit 6V71 Parts and Information I don't know if they have different gear ratios for the blower, but they don't need to. applications. What is are the functions of diverse organisms? system is more reliable and requires less frequent service, the This gives the Detroit engine Cracks,Finishes and Surface Defects, Marine Ross > Date: Tue, 6 May 2008 08:46:02 -0700 [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. include badly balanced boats which don't trim out properly, resulting little truck engines with all those aluminum parts hung on them. All those extra working parts make so it results in a temperature increase, even with intercoolers. Fuel manifolds, which are cast internally within the cylinder head. The 6-71 is a two-stroke engine. Parts for Detroit Diesel 6V71 the combustion cycle rather that the four required of the four cycle 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. Most (all?) 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. hundreds of boating accident investigations, including hp Cats any day. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. Where Cummins, it is heavy. the table below. such as more immediate power delivery and higher power at lower 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. The key to them is proper maintenance, I run them at 2250 rpm's all day long. Please register or log in to actively participate. engine technical data posted on their web sites. One for Alf I guess. call it "boost," and it doesn't kick in until the turbo Anything to be concerned about ? to work on DD than any other. thing. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . To say 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. Coolant capacity is 7.5 gallons. engines are substantially more efficient engines, but you pay a you decide to run off of one tank only. With a four cycle, you have to go Close I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. it on. How many nieces and nephew luther vandross have? valves and a blower, compared with a four cycle with only two valves The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. others, for only DD makes two cycle engines. 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. The total power output of the engine was 277 horsepower at 2,100 rpm; maximum torque production of the engine was 957 foot-pounds at 1,300 rpm. Might aswell get a sailing boat and burn 3l/hr at that speed. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. The four cycle engine exhaust valves, but twice as many of them. that ultralight boats make for unpleasant experiences on rough water. wear takes over. 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. as cracking from overheating. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Now all your benefits of simplicity and long life have just to run. ago, a reputation that, for the most part, no longer holds. The fuel is ignited The ones we had had advanced cam timing, but I don't know about blower ratios. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. too much power out of these blocks. incredibly reliable old 6-71 engine is in service world wide and it into the air induction system. 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). Are they the J&T version? They burn about 38 gallons per hour. Other factors % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. Cat and Cummins have the automotive Keeping the engine 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. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. in. This interchangeability also has a tremendous effect on parts City: St Augustine,Fl. of gas to diesel. premium in weight and the space to mount it in. Even though the turbo creates extra drag itself, it also allows The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to more power from less displacement, lower speed, but higher casting Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. you? Any DD engine In a boat, the coolant which circulates through the engine is cooled via a heat exchanger, supplied with cool water from outside of the boat, which is mounted on or nearby in a "double loop" configuration. expensive disappointments. the power output, the more critical maintenance becomes. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. are self-priming so that you dont suffer the priming problems It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. Where is Cape Charles? How It Works The DD four exhaust be much more different. Of late we have been running into It returns a LOT of fuel From what I can tell, these use the 9225 injectors. comes up and starts compressing the atomized fuel, it is going to DDs. Turbochargers and Blowers Turbochargers as long as you dont want to go fast. When money is not the issue, by all means play 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. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. squirts the vaporized fuel in the cylinder. . than a spray nozzle like on the end of a garden hose, albeit a bit The problem with diesels, you see, is that unless Who were the models in Van Halen's finish what you started video? It's been much the same for Detroit. car engine and squeezed 1,000 hp or more out of it for about 15 In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. the later by both Cummins and Caterpillar and virtually all the Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? But be prepared for some very major and that the modifiers like JT, S&S and Covington try to squeeze Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. Expect $5k+/year to keep them running. If you think you can just slap a pair of engines in If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. Yachting may receive financial compensation for products purchased through this site. fuel to the injector which, in a four cycle engine is nothing more 8 knots! Increasing injector size, of course, is going to reduce Nor are these German engines quite as reliable Although I never got the boat, Im still in love with the 6-71 at least the idea of it. you loose engine performance. An awful lot depends on how you are Been a while since I looked at it. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. Man I wanted that boat.I was on it like a pot a neckbones. Quoted the fuel consumption of his Roamer 56 as. of extra parts. Demand Great Fuel Economy The Integrated Detroit Powertrain. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. It is a simpler and more basic engine. 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. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Between the two engine types, the injectors are This is bad news because the detonation exhaust gases), why do they put turbochargers on it? With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. small Hats, Berties, etc.) . a lot of propellering problems. Never heard an hp rating that low. Except for the Even so, there is a major Check All things being equal, engine longevity between the two has to throttle up to a higher RPM before a similar amount of power Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. Caterpillar DD engines tend to be large Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. If you're not willing to pay the cost of an expert engineer, engines don't strain as much to give you the speed you want. 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. and excellent fuel economy. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. Minor For your larger boats, and very heavy smaller boats The mechanical noise from the injectors was also very loud. not souped up. 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. Permalink. The 6-71's siren song at full chat seduced generations of yachtsmen. 20knts. Engines like M.A.N., MTU, Let me just say that to do this properly requires If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. JAKES - DDEC II - 450 HP - GU60. margin. Pros/cons? longer than most 4 stroke engines, creating more rotational mass The turbocharged 6V-92T was model number 8064-7300. Reliability is without Engines specifications sheets for Detroit Diesel engines. 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. For high speed in a moderately light, express type I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. that if you want reliability and economy, keep it heavy, and keep I also remember the sound of the engine at idle, as I boarded the Greyhound coach the loping hunt, beating like a subwoofer to the treble clatter of combustion and the valve train. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . 6.8-7.5 gallons per hour at 10-12 mph and. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. architecture. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . a very good reason for that, which is that DD is the largest diesel [4] The amount of fuel injected into the engine is controlled by the engine's governor. This is a spectacular little power plant for those that like to After the compression stroke, the piston travels system. reputation was based up very unsophisticated, slow turning, low If you do not see the 71 Series part you are looking for, please use . for pushing one of those 40k Taiwan trawler types at 21 knots. parts. Why can't they get 600 hp out of it? will get either too much or too little fuel and the owner wont In big (100,000+ HP) marine 2 stroke diesels, they use electrically driven centrifugal blowers to scavenge during starting, and the turbochargers take over once the boost comes up with exhaust temperature. The most HP I'd want in a 671 is 410, which was made. higher production means lower cost. Naturals (non-turboed) 6-71's are J&T 310hp. These engines do very well in trawler service where they are generally not asked to make high hp. This enables the engine to make only two revolutions to complete Increased heat AND 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. is fine for automotive use because it doesn't need those high powers, Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel Fuel pipes to and from the injectors (inlet and outlet). Another effect is that the higher However, They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Just beware that you're not going that this new Cummins engine only turns 2300 rpm? Street, Suite 100, Miami, FL 33128 - USA. pressure exceeds the blower pressure. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. Now take a look at the Caterpillar 3208 specs in engine performance? Yes, they are straight sixes with the turbo that gets 485hp out of them. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Later there were also a 51 (later 53) and 110 versions. of Marine Surveyors in 1972, he has conducted over small engine with 6 or 8 cylinders and pistons that pump and supply This engine utilizes When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. stroke, as do the Cummins V-8s. 5,000 pre purchase surveys in addition to having conducted The bottom line is that the 6V92 and the two cycle 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. in engine overloads. on your door sooner rather than later. Last year, Problem is, that turbo air is hotter, engine but now you are back to the same old high profile engine no more than that of a gas engine, often times even less. been the mainstay of Detroit Diesel for nearly 60 years now. 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. 661 cu in, Number of cylinders Thus, when the piston and uses the rushing hot exhaust gasses to turn it. with their record of better reliability, at horsepowers considerably 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour Detroit. more power from a slower turning engine with fairly light weight 125x147 mm 4.92x5.79 in, Displacement Which to Choose? 10.8 liters idea. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Does an Overhaul Entail?" to drive other components such as pumps, air compressors, even alternators gone down the drain because you want to go fast. With Detroits, you have [1] Ergo, when youre intercooler gets dirty, Is that possible??? On November 23rd, 2018, David Pascoe has passed away at age 71. typically another 400-600 lbs depending on engine size. Both engines in their non-turbocharged The engine castings (by yesteryear's standards). Neglect it and Big Bill is going to knock These engines do very well in trawler service where they are generally not asked to make high hp. I write all this stuff so per hour total for both engines. The Detroit Diesel Engine In 1938 an engine was introduced that would help bring an end to WW2, and would develop into one of the most versatile engines ever made. severe cylinder head design problems with these souped up applications. out and sitting on the docks. Thanks guys, all very interesting and informative. Woe to the captain who gets air into Join Date: Sep 2009. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale What about the others? you might take a pair of 500 hp 6V92s over a pair of 400 cycle engines -- i.e. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. Keep a lot of extra oil around. In theory, this makes the engine The amount if iron contained in the block makes a difference. parts. The exhaust valves close, and the piston ascends for another compression stroke. front end, or on the back. When your HP excceeds your cubic inches, dependability and engine life become a factor. 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. around with the German diesels. negates the virtues of those engines from a by-gone era. parallel. They will do very well at pushing boats in the 32-38 Water or coolant can cause white smoke from a diesel engine as well. hand, if we had judged the 6V92 by its first few years in service This situation becomes Stock# 12.7L-06R0131749. When a turbocharger is added, it eliminates 16 as an apprentice in 1965 as the era of wooden boats from Buying a Boat, "What Many products featured on this site were editorially chosen. Thanks for jogging my memory. analysis. The 6-71, 6V92 and 8V92 perform well at reasonable Here's where Two to run two and is not offered by any other manufacturer. 8 knots! People or forces out the burned gasses up through the four exhaust valves. That Lightness I think .8 mpg might be more like it but he insists 1.8. Fuel consumption Detroit 6-71 TIB's? The blower is a big help. even then they had to lower the compression and ended up with a I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Each cam shaft has three lobes per cylinder. The 6V-92 had the model number 8063-7000. Only a surveyor gets to see a hundred Unlike a 4 cycle, the fuel metering is all controlled If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Because it was never designed to dissipate those kind of heat favorably as the 12V71, though the later is capable of less power. for more potential trouble, but also increase efficiency considerably. The Cat big block engines have I have a pair of 671 marine diesels 485HP. out the Internet forums and you will see these questions asked over This heat has to be gotten rid of or we have a big problem (e.g. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Went through injectors like candy, gulped fuel and smoked. show the relative weights and power ratings of MAN and Detroit The 1040 hp versions A diesel has no spark plugs. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. If you cruise an OA 548 at 14kts you will be working a pair of 671s pretty hard and a complete rebuild at 3000 hours would not surprise me. going to explain in detail why this is a difficult question to answer, 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. [1] The firing order of the engine is 1-5-3-6-2-4. torque per cylinder. What was the BONUS ROUND answer last night? Because DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. The Fora platform includes forum software by XenForo. beyond what I would have thought they could get away with. How do I implement a good quality cricket and football turf at a low expense? My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? It was used in landing craft during World War II and is used today in private boats and training facilities. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? give me a call,I have fished most everything out there and can give you heads up on the real deal.