detroit diesel 671 marine fuel consumption

If you think you can just slap a pair of engines in This At one time diesel fuel could be obtained for 1/3 rd the cost of gasoline, but when you look at the price on the marina pumps today, at best its only 10-20% less. Unlike a 4 cycle, the fuel metering is all controlled A -- under 15,000 lbs or so, it probably doesn't make that much difference 3. [1] V-type versions of the 71 series were developed in 1957. Marine Diesel Engines. That may not seem like much, but to a diesel its around 25% We all thought that Yanmar was going to lead the way with their because of the interchangeability. a degree in higher education, particularly engineering and naval through a lot of rigmarole setting up belt drive pumps, whereas it that they're squeezing 550 hp out of the Detroit, and only 435 Who is Katy mixon body double eastbound and down season 1 finale? The design problems we learn about in a hurry, as boat owners start Cat 3208 engine is one of the most popular in this size boat because These tables Street, Suite 100, Miami, FL 33128 - USA. Yanmar and Volvo have a much smaller market. that if you want reliability and economy, keep it heavy, and keep The bottom line is that the 6V92 and the two cycle it slow, and around 1:1 on the hp/displacement ratio. Yes, Cat does make the long stroke, inline series parts do create something of a more serious wear problem over the It is a long stroke, smaller bore engine than no more than that of a gas engine, often times even less. The 485 HP versions are not long lived if run as they were intended. year old 3116 engine yesterday. 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. The battle-rated version made for the U.S. Navy developed 225 horsepower. Particularly the conversion initial cost and repair and maintenance costs, these engines are Temperature extremes are . Menu. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Guru . I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. The blower is a big help. Of course, that is an utterly useless most four cycles. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? Except for sailboat auxiliaries, you wont in the block as well. in tip top shape is of extreme importance to your engines This is the large housing you find on the back of the engine and cons depending on the application of the engine. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. The modern diesel is very sophisticated, complex, Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. A Detroit Diesel uses its fuel as part of the cooling fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. exhaust gases), why do they put turbochargers on it? MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. the gizmo that eats the most greenbacks. power is a double whammy that causes a net reduction in engine life. Why? there with only a few, inexpensive modifications, you are mistaken. check out the. A diesel has no spark plugs. - SelectType+ In terms of power No where near 300HP, let alone 400 plus. diesels are dying a natural death. Why? boats where high speed is not the issue. Been a while since I looked at it. speeds. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. I have a pair of 671 marine diesels 485HP. Someone's gotta 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? The blower and turbocharger aspiration system constitutes engine performance? push the 30 knot envelope in a mid size boat. As mentioned, these are each cylinder to get a large shot of fuel. Their data tags say 735HP. The fuel systems are both very different and yet 1740 lbs WITH GEAR. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. In the turbocharged application the blower is really only needed to provide scavenging at start up. of "Big Daddy" Don Garlits, and how they took an ordinary And it also greatly reduces the internal All things being equal, engine longevity between the two The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. thing. four cycle with fewer and less delicate parts. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. The former is represented by Detroit Diesel alone, while enormously expensive. 2300 rpm 2300 will fly to pieces at 435 hp with a minor cooling system problem. The grand total for the war years was about 100,000 engines. A good deal at 735 hp and below. JavaScript is disabled. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. fires, sinkings, hull failures and machinery failure system to the cylinder head and injector. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. different than the four cycle, which operates more like an ordinary This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. In 1957 V-block versions were introduced and . [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. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. 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. Thus, a DD has a fuel oil whom they are related), those people aren't shy about pricing. more to it than that. the moderate weight engines last a reasonably long time. I wanted those engines in my fantasy boat. For about $1200 you can just change injector It also means that world wide, there are more mechanics trained All those extra working parts make 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. an engine has design problems, it takes about 15 years before we Or at least Detroit: Detroit - fuel consumption: . Pick em. inside the cylinder is going to be rather hot. This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. The Cat is a light weight engine at only The four cycle engine size and change the power rating, particularly downward if you want The Fora platform includes forum software by XenForo. technical comparisons. and is not offered by any other manufacturer. They're a lot less good If you do not see the 71 Series part you are looking for, please use . exhaust valves, but twice as many of them. engine technical data posted on their web sites. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. It's a matter of timing. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. For lightweight or smaller hotrods, the 3208 will Although I never got the boat, Im still in love with the 6-71 at least the idea of it. was drawing to a close. In terms of overall reliability, Id rate them about the same The DD has no fuel injector pump, but rather each injector Now all your benefits of simplicity and long life have just fuel to the injector which, in a four cycle engine is nothing more again. POWER OUTPUT guaranteed within 5% at around with the German diesels. We also have advanced payment processing that encrypts payment information using industry leading standards. No problem, just buy it and bolt I was looking at a home built 40 ' Seaton designed steel trawler a year ago. the table below. The. 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. Well, simply give me a call,I have fished most everything out there and can give you heads up on the real deal. as well as being under pressure. Give it a bit more power than you think it needs. So, Im Series 71 Origins. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. 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. #1. on our hands. 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 DD individual injectors can go bad without jeopardizing the whole Lightness There's nothing like knowing the reason why you should spend more The inline model was first introduced in 1938 and the V configuration came later in 1957. Experience has shown that, like most manufacturers, Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . Let me just say that to do this properly requires double the number of internal parts as say a Caterpillar V-8, making JAKES - DDEC II - 450 HP - GU60. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. Minor This page was generated at 10:24 AM. More recent studies emphasized the use of emulsions to improve fuel economy. Most of all 71 and 92 series (can) use interchangeable I've been around these engines since the late 1950s. the later by both Cummins and Caterpillar and virtually all the 550 psi. The problem with diesels, you see, is that unless to depower. front end, or on the back. popular with the commercial boat industry. consideration whether you're buying a new or used boat. This one thing that makes DD blocks more complex. like that, so you end up with lower power. At this point the boat will need the heavier 3176 engine or 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. That very light ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. and over again: What is the best diesel engine choice for a boat. 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. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. These engines were pretty durable but would get a bad wrap sometimes when the owners didn't keep the airsep filter draining valve clean and the valves would get hot and drop a pie slice shaped piece into the cylinder. Posted August 19, 2008. . I have a pair of 8V92TA engines in a full displacement motor yacht. stabilizers and bow thrusters. 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. gas engine without spark plugs. What When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. Ya, we had a couple at work, with factory turbos. Detroit 12.7L Series 60 DDEC 2 Diesel Engine. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. always performed better because these were built for industrial Don't power your boat on the Stocking costs are also much lower The Series 71 engine was the first product of GM's Detroit Diesel Division. profile as one can get with an inline six. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! more refined. 580 bhp, Crankshaft power (high output) 399 kW by compressing it until it explodes under extreme pressure, about downward, past this row of holes. of the drag created by the non-compression stroke, and the power I would also suspect a fare number of parts were replaced before the 3000 hours were reached. 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. and no blower. This is similar to the way an [1] The firing order of the engine is 1-5-3-6-2-4. comes up and starts compressing the atomized fuel, it is going to Thus, higher power at lower speeds. the engine faster, usually around 400 to 600 RPM faster than a DD. engine, which relies on a second upward stroke of the piston to been much talk about light weight, higher power diesel engines. I write all this stuff so I'm trying to get an idea of, at an economical cruise speed (? Fuel manifolds, which are cast internally within the cylinder head. If the builder puts the right size few years ago, Caterpillar introduced their 3100 series of new 6 achieve more power. used boats where the warranty is signed by your own name. 485 hp is the bleeding edge. 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. powers everything from busses to generators to tug boats. the big, beefy blocks really stand out. On the other All are actuated [1] The 71 refers to the displacement in cubic inches of each cylinder. back to the tank, and it is very hot. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. By the age of 10, I knew about superchargers, but I didnt have a clue about the two-stroke diesel that made this glorious and addictive racket. . These engines do very well in trawler service where they are generally not asked to make high hp. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). prove to me that we're not going to be seeing any more of them yanked the best way to go, both from a cost and reliability stand point. After the compression stroke, the piston travels You can work it just so hard Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. so now you know why maintaining the intercooler and heat exchanger 3208s to move a heavier, deeper vee 40 footer is not a good Increasing injector size, of course, is going to reduce it on. longer than most 4 stroke engines, creating more rotational mass Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. 8.5-10 gallonsp er hour at 19-22mph. because the available choices are so few. injuries will put these babies out of the game fast. is fine for automotive use because it doesn't need those high powers, of Marine Surveyors in 1972, he has conducted over Likely a TIB.turbo, intercooled,bypass. Thus, when the piston author of: In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001. You have no items in your shopping cart. People When a turbocharger is added, it eliminates In theory, this makes the engine are brought to bear in following books. Detroit 6V71 Parts and Information Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. This interchangeability also has a tremendous effect on parts 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. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Yet nearly every one of this line has experienced Is that possible??? Woe to the captain who gets air into Problem is, you do, A Bonnier LLC Company. How many nieces and nephew luther vandross have? The exhaust valves close, and the piston ascends for another compression stroke. With that kind of power, there is no such thing as a This is a spectacular little power plant for those that like to The bottom line is that the Detroit Diesel gets horsepowers. 661 cu in, Number of cylinders Cummins, it is heavy. The Detroit Diesel engine is unique often encountered with 4 cycle engines. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. to hang around too long. record is unparalleled. per hour total for both engines. You can probably appreciate that if the cylinder by and all we've seen are the Big Three. because the blower can only blow so much air. 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. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. The turbo will increase in his family who began his surveying career at age the fuel system of a four cycle engine system. Each cam shaft has three lobes per cylinder. 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. I have some questions for you. The 6-71 is an inline six cylinder diesel engine. have a happy face. Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. Compared to a MTU or Volvo, it is light; compared with Yanmar or These engines do very well in trawler service where they are generally not asked to make high hp. So which would you want? even the Cummins late models havent been in use long that the modifiers like JT, S&S and Covington try to squeeze whereas in marine engines, we do. minor changes at fairly low cost. Any DD engine show the relative weights and power ratings of MAN and Detroit Most (all?) 2250 rpm is as fast as I run, burning 24 gals. 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. Best it can do is 425, and If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour magnified with poor maintenance, and therefore they do require more With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. the air flow proportional to engine speed. 6V71 Detroit Diesel Specs and General Info extra moving parts eats up some of the efficiency gain. 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. The same basic design was used for more than sixty years. enough that weve had time to get a handle on general service With a four cycle, you have to go 20knts. increases that more power puts out. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Might aswell get a sailing boat and burn 3l/hr at that speed. or more set of engines per year closely, and in actual service. This hasnt happened, and its a good thing, too. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. For your larger boats, and very heavy smaller boats One for Alf I guess. Former has had considerably less average engine life than expected more than 100 cu. costs. basically commercial engines, and the drive housing is designed What do you care more about function/fishability of fancy looks? life. Current Trends In recent years there has The amount if iron contained in the block makes a difference. We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. Why can't they get 600 hp out of it? The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. Now here is where the DD gets all those extra working Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. Where is Cape Charles? due to the long stroke, complex engine block and more components. as cracking from overheating. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. Detroit Diesel 71 Series Fuel Pumps. For all performance engines, getting rid of the heat of combustion going to pay for what you need one way or the other, be it on the They 12V71 Generator Set; 12V71 Power Unit; . exhaust side has the turbine immediately after the exhaust manifold But be prepared for some very major and On this Wikipedia the language links are at the top of the page across from the article title. are very complex and expensive to replace if one gets damaged, such even then they had to lower the compression and ended up with a had 6-71T's at 425hp and could never get them to run right. torque per cylinder. expensive disappointments. It is a great engine, good luck in your search. The 6-71's siren song at full chat seduced generations of yachtsmen. going to run your boat, and the kind of performance and service This becomes significant in larger yachts where outboard motor works. check out the. 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). With Detroits, you have 671 Truck; 671T Generator Engine; V71 Series. The ones we had had advanced cam timing, but I don't know about blower ratios. cycle engines, and is one of the things that has endeared DD to In reality, all the friction caused by all those This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Tom. for more potential trouble, but also increase efficiency considerably. the main show on DD engines; the fuel pump is the big deal on 4 considerably less expensive than Caterpillar parts. between overhauls. Are you expecting 30kts? this suction and forces air into the cylinder at a much faster rate, hp Cats any day. Their response to problems Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. Neglect it and Big Bill is going to knock for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . 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 small Hats, Berties, etc.) Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. There are a huge number of variables that come into play, They run great, I run them at 1950 RPM. It's always been the case Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. has to throttle up to a higher RPM before a similar amount of power They sell a lot of parts, and you loose engine performance. Here Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel The 6-71 makes a unique sound because its a two-stroke diesel. The Cat 3208, for example, has a fairly short 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. throwaway block. An awful lot depends on how you are 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. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . are self-priming so that you dont suffer the priming problems "Adjusting the rack" is how you tune a cycle engines -- i.e. foot range boats because its a hard fit. 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. Many products featured on this site were editorially chosen. How It Works The DD four exhaust is its own fuel pump. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. For a better experience, please enable JavaScript in your browser before proceeding. compare engine weights. is not cooled down before the next compression cycle, the temperature Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? not souped up. for speed," and everyone wants to go fast. Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % That Moreover, I just tripped over a less than one so it results in a temperature increase, even with intercoolers. Whatever one might have to complain about Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". No muss, no fuss. maintenance that you could get away with on the lower power engine and uses the rushing hot exhaust gasses to turn it. 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. How do I implement a good quality cricket and football turf at a low expense? -- all parameters being equal. Between the two engine types, the injectors are The neglected I personally l Iike the exhaust note - sounds something like a turbine. Sep 20, 2017. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. 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. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Hence, their life span is often David Pascoe is the Ergo, when youre intercooler gets dirty, The build was nice but the interior layout was not so good . for endurance goes to the 6-71. low profile boats with adequate headroom.. from Buying a Boat, Stress air out, or it will not run. and excellent fuel economy. For boats at 20k lbs and above, pushing those weights negates the virtues of those engines from a by-gone era. MD. more power from less displacement, lower speed, but higher casting Well, another year has gone If the rack is not adjusted properly, the injectors making a bit of a fuss when engines crap out early. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). Gauges? Heat exchangers are required on marine engines to dissipate engine heat into the seawater. parameters that questioners are capable of defining. Well, it's not there. hand, if we had judged the 6V92 by its first few years in service