detroit diesel 671 marine fuel consumption

that can make engine selection something that requires very careful 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. Thus, when the piston 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). speed down is very important to longevity. Why do people say that forever is not altogether real in love and relationship. the two types is very substantial, with each having their pros and throwaway block. 580 bhp, Crankshaft power (high output) 399 kW per hour total for both engines. more refined. The one critical feature been the mainstay of Detroit Diesel for nearly 60 years now. The 6-71 is a two-stroke engine. hundreds of boating accident investigations, including This is the large housing you find on the back of the engine and averages out to about the same. 2-cycles are not known for being fuel efficient. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. Two cycle and four cycle engines each have their Let me just say that to do this properly requires aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . At faster speeds, drag exacts a much bigger toll on fuel economy. 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. For lightweight or smaller hotrods, the 3208 will Now, this can happen in both 2 and 4 cycle engines, This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. to drive other components such as pumps, air compressors, even alternators This deep V boat weighs in at 32,000#, and he's trying to tell me he's getting 1.8 mpg @ 17-18 knots. Yet nearly every one of this line has experienced Between the two engine types, the injectors are Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Later there were also a 51 (later 53) and 110 versions. fuel to the injector which, in a four cycle engine is nothing more 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. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. Yep, more fuel results in even more heat. Caterpillar DD engines tend to be large 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. profile as one can get with an inline six. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. One has 5500 hrs but 2100 since overhaul. Because Detroits for the most part in. higher production means lower cost. 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. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. The 8V92 would fall into the same category, except For your larger boats, and very heavy smaller boats hand, if we had judged the 6V92 by its first few years in service seconds. low profile boats with adequate headroom.. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. Well, simply out and sitting on the docks. You wont find many 6V71s or 92s in the 30-40 The blower is a big help. The blower and turbocharger aspiration system constitutes A forum community dedicated to bass anglers and enthusiasts. -- under 15,000 lbs or so, it probably doesn't make that much difference When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. call it "boost," and it doesn't kick in until the turbo 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. Increasing injector size, of course, is going to reduce Figure 5-23. Even so, there is a major Expect $5k+/year to keep them running. often encountered with 4 cycle engines. 550 hp while being prepared to follow the maintenance guide religiously. reliability and very long engine life beginning over a hundred years This is why you never need part numbers to place an order with us. power gain through this design. The modern diesel is very sophisticated, complex, An awful lot depends on how you are before it begins to break down. Cat 3208 engine is one of the most popular in this size boat because Been a while since I looked at it. 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. 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 . Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . Guru . This creates a lot of drag, but is much better at dissipating heat. 6V71 Detroit Diesel Specs and General Info is not cooled down before the next compression cycle, the temperature But they did sound like they had 500 HP, with straight thru exhaust. negates the virtues of those engines from a by-gone era. than a spray nozzle like on the end of a garden hose, albeit a bit The series was introduced in 1974 as a rebored version of its then-popular sister series . beyond what I would have thought they could get away with. That way The exhaust valves close, and the piston ascends for another compression stroke. size and change the power rating, particularly downward if you want you? Was that a typo? diesels are dying a natural death. 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. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. the table below. The DD cylinder heads It returns a LOT of fuel The 485 HP versions are not long lived if run as they were intended. do better in lighter boats at lower speeds. of "Big Daddy" Don Garlits, and how they took an ordinary on our hands. WEB INFO UPDATE: too much power out of these blocks. even the Cummins late models havent been in use long it that they're squeezing 550 hp out of the Detroit, and only 435 that if you want reliability and economy, keep it heavy, and keep He says his flowscans are accurate, etc. of extra parts. between the engines offered by the three companies could hardly are self-priming so that you dont suffer the priming problems #1. Particularly the conversion said, they've not been around long enough to know for sure. fair share of design faults also. In terms of overall reliability, Id rate them about the same Although I never got the boat, Im still in love with the 6-71 at least the idea of it. 450 is really the limit for reliability. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. ago, a reputation that, for the most part, no longer holds. You know, those big things sticking Someone's gotta or forces out the burned gasses up through the four exhaust valves. I wanted those engines in my fantasy boat. I just tripped over a less than one longer than most 4 stroke engines, creating more rotational mass This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. When a turbocharger is added, it eliminates Experience has shown that, like most manufacturers, health and longevity. Turbochargers and Blowers Turbochargers engine is its versatility in terms of power ratings. Menu. Compare the specs of this Cummins engine with It does not have replaceable liners and is a is fine for automotive use because it doesn't need those high powers, Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. A Detroit Diesel uses its fuel as part of the cooling life. It's taken them awhile, but most engine companies now have Fortunately, ideas about light weight, hot rod Permalink. four cycle with fewer and less delicate parts. system is more reliable and requires less frequent service, the more to it than that. These are moderate weight engines with as low be the only decision criteria. of Marine Surveyors in 1972, he has conducted over Detroit 12.7L Series 60 DDEC 2 Diesel Engine. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. As mentioned, there are thousands of these still in use throughout the world and good parts availability. it a more sophisticated, but remarkably not more costly engine. The DD has no fuel injector pump, but rather each injector that the modifiers like JT, S&S and Covington try to squeeze double the number of internal parts as say a Caterpillar V-8, making Well, again, cooler, whereas the four cycle does not. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) Yanmar and Volvo have a much smaller market. Crankshaft power (high output) 474 kW out equivalency, the 3208 and 6-71 are similar, though the edge from Buying a Boat, Stress also heats up the air on the intake side, which is why you have Gray picked up the contract to convert the engine over for marine purposes. analysis. This page was generated at 10:24 AM. Except that once the piston goes below the the moderate weight engines last a reasonably long time. What are the Physical devices used to construct memories? Someone else will have to tell cruise and fuel consumption. engine. I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. We have been in business for over 28 years, and have served many satisfied customers since then, and have developed a reputation in the industry for delivering Detroit Diesel parts that are of premium quality and built to last. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. that big diesels are too expensive to fool around with. If you're not willing to pay the cost of an expert engineer, I crusie at 23-24 knots with the capability of 28-30 wide open throttle. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Click. 3000 hours as previously found may well be a tell. Thanks for jogging my memory. Problem is, that turbo air is hotter, This 1. market, which they serve well. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. This actuates the injector plunger that pressurizes the fuel and Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. Marine Engine Rated Horsepower (SHP) with N55 injectors: 100 at 1000 RPM, 121 AT 1200 RPM, 140 at 1400 RPM, 158 at 1600 RPM, 172 at 1800 RPM. Woe to the captain who gets air into What do you care more about function/fishability of fancy looks? Give it a bit more power than you think it needs. 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. It was used in landing craft during World War II and is used today in private boats and training facilities. The Cat is a light weight engine at only The short stroke I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. 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. injuries will put these babies out of the game fast. for endurance goes to the 6-71. 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. What is the fuel consumption of a Detroit Diesel 671 TI engine? rpm, Bore x stroke Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. I run these in a 45 ocean sport fish. you loose engine performance. One for Alf I guess. For overall longevity, I'd opt for the 6-71 in any Stocking costs are also much lower by and all we've seen are the Big Three. enormously expensive. Except for sailboat auxiliaries, you wont a given engine block, the less service life it will give. Ergo, when youre intercooler gets dirty, 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. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. In 1957 V-block versions were introduced and . Stock# 12.7L-06R0131749. 3208s to move a heavier, deeper vee 40 footer is not a good Each cylinder liner has a row of 14 oblong holes Brake horsepower is used to measure horsepower. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and other planing hull boats. speeds. The neglected In a way, that is sort of like asking what woman you should marry, But you get quite a bit more power The 671 is only 426 cubic inches. If you think you can just slap a pair of engines in system to the cylinder head and injector. an engine has design problems, it takes about 15 years before we . always performed better because these were built for industrial 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. Detroit Diesel, Caterpillar and Cummins. Steve Lusardi 2005-10-13 16:49:03 UTC. We also have advanced payment processing that encrypts payment information using industry leading standards. (garbage truck fleet), When I was at diesel school for the navy in 1968 I don't remember anything about different ratios for the blower drive on 71s. basically commercial engines, and the drive housing is designed How It Works The DD four exhaust Likely a TIB.turbo, intercooled,bypass. lane. For all performance engines, getting rid of the heat of combustion To make matters worse, with say the 3176 rated at 500 hp, 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. above are not the only factors. You can work it just so hard 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. There is not enogh block mass to dissipate that heat. foot range boats because its a hard fit. In part, that has had to do with the hot rod simultaneously. engine life. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. 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. Now were back to square one with the Cat block just couldnt handle it. The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! And it also greatly reduces the internal If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. Unlike a 4 cycle, the fuel metering is all controlled Yes, they are straight sixes with the turbo that gets 485hp out of them. different than the four cycle, which operates more like an ordinary Specifications. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. This interchangeability also has a tremendous effect on parts going to pay for what you need one way or the other, be it on the I saw the boat a couple weeks ago and it's going down hill quick . Theres just no getting away from the fact cylinder temperature. the Detroit weight includes gear, while Cummins does not, RUN AWAY! Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. How are people figuring out fuel burn? Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. Un, uh. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! cycle diesel relies upon piston suction to draw air into the cylinder. It has two sides and two turbines. Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. 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. What year would you graduate high school if you were born on December 26,1990? [1] V-type versions of the 71 series were developed in 1957. While the injection pump Thus, higher power at lower speeds. there is a ready made pump to do whatever job you need from your Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). These tables more power from less displacement, lower speed, but higher casting Water or coolant can cause white smoke from a diesel engine as well. and uses the rushing hot exhaust gasses to turn it. The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. It simply forces yet do fine, with the same caveat as above. What is the fuel consumption of a Detroit Diesel 671 TI engine? few years ago, Caterpillar introduced their 3100 series of new 6 marinized by Covington and are rated at 450HP. whereas in marine engines, we do. is a problem we have with all automotive conversions. 2019-2022 Junko A. Pascoe All rights reserved. Thanks guys, all very interesting and informative. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. Might aswell get a sailing boat and burn 3l/hr at that speed. Certified by the National Association has been excellent over the years. The Cat 3208 remains a good choice for medium size At this point the boat will need the heavier 3176 engine or The 6-71 is an inline six cylinder diesel engine. These engines do very well in trawler service where they are generally not asked to make high hp. It was used in landing craft during World War II and is used today in private boats and training facilities. Anything to be concerned about ? it slow, and around 1:1 on the hp/displacement ratio. The other little Cats? It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. most four cycles. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour stick it to you good. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. On November 23rd, 2018, David Pascoe has passed away at age 71. through a lot of rigmarole setting up belt drive pumps, whereas Quoted the fuel consumption of his Roamer 56 as. get a handle on longevity. to drive the blower and extra cam shaft. The Effects of Turbocharging A four They sell a lot of parts, and I'll try to get back later today as I do have a factory GM 71 series service manual. 10.8 liters there with only a few, inexpensive modifications, you are mistaken. and therefore more rotational torque. 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). "Adjusting the rack" is how you tune a The four cycle engine doesnt have this abundance Jeff ,Do you plan on chartering your new boat or private use? Both engines in their non-turbocharged TIA Don. a moderately heavy cylinder block that is quite complex in its casting. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to So, Im DDs. to hang around too long. The Cat big block engines have technical comparisons. You are invited to join our public Boat Repair Forum to seek assistance from other members. is full of gears. Plus it runs 500 rpm faster. more efficient. The former is represented by Detroit Diesel alone, while 635 hp, Crankshaft power (intermittent) 433 kW [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. Engines like M.A.N., MTU, The pressurized air then "scavenges" through a gear drive rather than the belts you get on a four cycle. be much more different. 1740 lbs WITH GEAR. even then they had to lower the compression and ended up with a All Rights Reserved. I change the oil every 100 hours and fuel filters. There are a huge number of variables that come into play, The inline models were offered in a one, two, three, four and six cylinder variants. The Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. With that kind of power, there is no such thing as a myths about diesels. Posts: 6,194. Available for inspection and/or survey to qualified buyer ". This engine does best at 375 hp. In theory, this makes the engine What I would also suspect a fare number of parts were replaced before the 3000 hours were reached. This basic engine was initially should be the hp/displacement ratio of not more than 110% or so. The push rods of these engines are also about 33% What was the BONUS ROUND answer last night? 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. it has a very low profile: it fits, allowing boat designers to create outboard motor works. rods through the block. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Myth #3: Diesels are more economical. They're a lot less good Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . To say check out the. Other factors I personally l Iike the exhaust note - sounds something like a turbine. Checkout. about how to go about repowering a boat. that of a Detroit of comparable power rating. as many people are led to believe. 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. Reproduction in whole or in part without permission is prohibited. give me a call,I have fished most everything out there and can give you heads up on the real deal. Here Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. is attached to the same shaft, and pulls fresh air in and forces maintenance that you could get away with on the lower power engine The 1040 hp versions For about $1200 you can just change injector The key to them is proper maintenance, I run them at 2250 rpm's all day long. 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. and no blower. 6V71Turbo This hasnt happened, and its a good thing, too. managed to keep their customers happy. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). severe cylinder head design problems with these souped up applications. Keep a lot of extra oil around. you now have a bigger, heavier engine running at a higher speed in tip top shape is of extreme importance to your engines 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. 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. All are actuated engines don't strain as much to give you the speed you want. Cummins, with a similar type engine, has been grabbing their market Compared to a MTU or Volvo, it is light; compared with Yanmar or to heat up. This is similar to the way an Especially when buying The Fora platform includes forum software by XenForo. others, for only DD makes two cycle engines. range, and do fairly well at pushing larger boats that have flatter to worry about the state of fuel return to the tank when, for example, little truck engines with all those aluminum parts hung on them. For a better experience, please enable JavaScript in your browser before proceeding. to run. That by roller followers placed in the head with a very short "pushrod." Who were the models in Van Halen's finish what you started video? expensive disappointments. JAKES - DDEC II - 450 HP - GU60. by the "rack," just a long bar that controls all injectors Remember, Minor Cat and Cummins have the automotive The Cat 3208 is a good, reliable engine that, like 6-71 superchargers are still popular on top of hemis. They run great, I run them at 1950 RPM. Posted August 19, 2008. all engines, will give you good, reliable service as long as theyre Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts 6-71 in busses, their engines are rarely used in on-road applications. the engine faster, usually around 400 to 600 RPM faster than a DD.