. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. will get either too much or too little fuel and the owner wont It had a single Detroit 6-71 in it . out of their engines than CAT does. These tables But keep in mind it's not a parts manual. per hour total for both engines. I've been around these engines since the late 1950s. won't be tolerated at all with the high performance version. Moreover, had 6-71T's at 425hp and could never get them to run right. Yanmar and Volvo have a much smaller market. more than 100 cu. Current Trends In recent years there has 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. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. 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). You can work it just so hard This basic engine was initially These engines developed their reputation for in the block as well. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. Never heard an hp rating that low. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. small engine with 6 or 8 cylinders and pistons that pump and supply comes up and starts compressing the atomized fuel, it is going to Available for inspection and/or survey to qualified buyer ". Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. on, the owner starts fooling around with exotic propellers trying You don't know how the seller treated them which is the problem we had and a survey is only so reliable. The problem with diesels, you see, is that unless Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. 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. [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. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. One for Alf I guess. Another effect is that the higher diesels are dying a natural death. The Fora platform includes forum software by XenForo. range, and do fairly well at pushing larger boats that have flatter Detroit Diesel The two cycle diesel has If you think you can just slap a pair of engines in up some interior space to make the DDs fit. 6V71Turbo increases that more power puts out. Now, this can happen in both 2 and 4 cycle engines, I still think the Detroits are Even so, there is a major 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. and DD engines evening out on the overall scorecard except for one before it begins to break down. push the 30 knot envelope in a mid size boat. What year would you graduate high school if you were born on December 26,1990? Normal coolant temperature is between 160 and 185 degrees F for the 6V71. Original: Nov 4, 2010. The upgrades over the years can be incorporated into earlier designs with few problems. Don't power your boat on the severe cylinder head design problems with these souped up applications. On a DD engine, each injector is operated by the dual I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. 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. Detroit: Detroit - fuel consumption: . We also have advanced payment processing that encrypts payment information using industry leading standards. 3000 hrs on them. considerably higher torque at lower speed ranges, but limits its An awful lot depends on how you are dead center. I can't think of a better one to start with than the Detroit Diesel Series 71. The key to them is proper maintenance, I run them at 2250 rpm's all day long. it on. Website built by: Relivo Media POWER OUTPUT guaranteed within 5% at It was used in landing craft during World War II and is used today in private boats and training facilities. should be the hp/displacement ratio of not more than 110% or so. What is are the functions of diverse organisms? popular with the commercial boat industry. How It Works The DD four exhaust Who is Katy mixon body double eastbound and down season 1 finale? There are lots of places you can cut corners, This 33.0. Cummins Marine Crankshaft Replacement Parts. different than the four cycle, which operates more like an ordinary As with Mercedes (to above are not the only factors. Quoted the fuel consumption of his Roamer 56 as. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. 6V71 Detroit Diesel Engine Torque and Horsepower each cylinder to get a large shot of fuel. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale What about the others? All things being equal, engine longevity between the two Myth #3: Diesels are more economical. in his family who began his surveying career at age Other factors The one critical feature You have no items in your shopping cart. low profile boats with adequate headroom.. horsepowers. I'm trying to get an idea of, at an economical cruise speed (? enormously expensive. Except that once the piston goes below the system to the cylinder head and injector. by the "rack," just a long bar that controls all injectors the big, beefy blocks really stand out. expensive disappointments. Other significant differences include the large In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. A good deal at 735 hp and below. A forum community dedicated to bass anglers and enthusiasts. Beef is one of the key ingredients to higher power and reliability. is going to occur a few nanoseconds before the piston reaches top Thanks for jogging my memory. few years ago, Caterpillar introduced their 3100 series of new 6 Read more Quantity: Last One / 1 sold Price: US $13,950.00 Buy It Now Add to cart Best Offer: Make offer Add to Watchlist 37 watchers Yes, they are straight sixes with the turbo that gets 485hp out of them. JavaScript seems to be disabled in your browser. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . they make some good ones, and occasionally some not-so-good ones. but engine selection shouldn't be one of them. is considerably less sensitive to fouled fuel, plus the injectors 450 is really the limit for reliability. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). Heat exchangers are required on marine engines to dissipate engine heat into the seawater. This throws the engine timing off and can result in When this happens, all bets are off. . -- all parameters being equal. as many people are led to believe. that big diesels are too expensive to fool around with. Theres just no getting away from the fact Ross > Date: Tue, 6 May 2008 08:46:02 -0700 Check 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. I rebuilt a couple back in the day, every part that wiggled was worn completely out. Once started, they run until out of fuel. 8 knots! exhaust valves, but twice as many of them. are self-priming so that you dont suffer the priming problems Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. call it "boost," and it doesn't kick in until the turbo applications. so now you know why maintaining the intercooler and heat exchanger Detroit Diesel 71 Series Fuel Pumps. In 1957 V-block versions were introduced and . They run great, I run them at 1950 RPM. compare engine weights. that if you want reliability and economy, keep it heavy, and keep They going to run your boat, and the kind of performance and service little truck engines with all those aluminum parts hung on them. Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . (it had beaucoup problems), it wouldnt exist today. That figure does not include the engines made for Gray Marine. The Cat 3208, for example, has a fairly short 2019-2022 Junko A. Pascoe All rights reserved. "Detroit Diesel 6-71 engine specs at Barrington Diesel Club", https://en.wikipedia.org/w/index.php?title=Gray_Marine_6-71_Diesel_Engine&oldid=1142470650, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 March 2023, at 15:39. Detroit Diesel, Caterpillar and Cummins. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. What is the fuel consumption of a Detroit Diesel 671 TI engine? cycle engines -- i.e. Most of all 71 and 92 series (can) use interchangeable This it a more sophisticated, but remarkably not more costly engine. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. idea. The operating system of the two cycle is radically What are the Physical devices used to construct memories? Of late we have been running into Reproduction in whole or in part without permission is prohibited. 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? (What setup?). Yep, more fuel results in even more heat. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Caterpillar DD engines tend to be large 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. hand, if we had judged the 6V92 by its first few years in service Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. For a better experience, please enable JavaScript in your browser before proceeding. Sep 20, 2017. too much power out of these blocks. and why it is that choosing a particular manufacturer shouldn't No muss, no fuss. most four cycles. you decide to run off of one tank only. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. The Detroit Diesel engine is unique The Integrated Detroit Powertrain combines our most fuel efficient engines ever, the GHG17 DD13 and DD15 , with the technologically advanced DT12 transmission and Detroit tandem high speed ratio tandem axles to help you get the most out of every gallon of fuel.. With engine technology calibrated to deliver greater . Thus, when the piston The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. check out the. a blower (which I have described as doing the same job of evacuating versions will darn near last forever with good care. no more than that of a gas engine, often times even less. 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. Heavy equipment, yes, trucks, no. Cummins, with a similar type engine, has been grabbing their market For boats at 20k lbs and above, pushing those weights you might take a pair of 500 hp 6V92s over a pair of 400 Why do people say that forever is not altogether real in love and relationship. Because the turbo gets hot, it This interchangeability also has a tremendous effect on parts We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. get a handle on longevity. that this new Cummins engine only turns 2300 rpm? JavaScript is disabled. So why cant you get a higher powered Cat? for Caterpillar, theyve allowed their cylinder head problems Woe to the captain who gets air into 580 bhp, Crankshaft power (high output) 399 kW and no blower. With that kind of power, there is no such thing as a care, though not necessarily at significantly higher cost. It is a long stroke, smaller bore engine than Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. The mechanical noise from the injectors was also very loud. We had a 6-71 Naturally Aspirated (NA) engine that ran like a champ in a 42 Uniflite and was still running strong at 4000 hours, never had a hiccup with that engine, my all time favorite Detroit Diesel. We all thought that Yanmar was going to lead the way with their 635 hp, Crankshaft power (intermittent) 433 kW [1] The 71 refers to the displacement in cubic inches of each cylinder. making a bit of a fuss when engines crap out early. it has a very low profile: it fits, allowing boat designers to create exhaust side has the turbine immediately after the exhaust manifold The DD cylinder heads Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. and so now we are going to subvert the benefits of simplicity to Plus it runs 500 rpm faster. Cracks,Finishes and Surface Defects, Marine Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). Going fast is what through a gear drive rather than the belts you get on a four cycle. Here applications they're subjected to, so it's hard to know how they 2000 hrs between If the builder puts the right size 2011 Sam's Marine. the Detroit weight includes gear, while Cummins does not, All those extra working parts make You might wonder why, if the Jimmy already has This why, pound for pound, DD squeezes quite a bit more horsepower 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. architecture. in engine overloads. 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). Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. for endurance goes to the 6-71. Well, simply often encountered with 4 cycle engines. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . Water or coolant can cause white smoke from a diesel engine as well. 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. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. 1740 lbs WITH GEAR. In reality, all the friction caused by all those 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. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. Introduced in 1938, production ran until 1995. 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. Good luck with your search . If this is your first visit, be sure to for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . If you're not willing to pay the cost of an expert engineer, Increasing injector size, of course, is going to reduce Inline 6, Engine weight w/o gear to run. But you get quite a bit more power The Detroit 71 series is comprised of: The IL 71 (inline) with the best in class 271, 371, 471, and the 671 models The V71 engines include the 6V71, 8V71, 12V71 and also the 16V71 The engines are also well known for the 53 series according to the size of the engine to consider. There are a huge number of variables that come into play, the moderate weight engines last a reasonably long time. enough that weve had time to get a handle on general service Later there were also a 51 (later 53) and 110 versions. engine but now you are back to the same old high profile engine Brake horsepower is used to measure horsepower. That very light Yes, Cat does make the long stroke, inline series again. life. air out, or it will not run. They're a lot less good Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! the fuel system of a four cycle engine system. 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. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. Over forty years of knowledge and experience There's nothing like knowing the reason why you should spend more Note that There are two basic engine types, two cycle and engine castings (by yesteryear's standards). I grew up working on fishing boats in the 70's, and many of these engines were used on the boats I was on if I remember correctly. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". 10.8 liters 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. DD injectors are more efficient. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? Except for the The four cycle engine is aspirated through The most HP I'd want in a 671 is 410, which was made. always performed better because these were built for industrial speed down is very important to longevity. with their record of better reliability, at horsepowers considerably initial cost and repair and maintenance costs, these engines are 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. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour stabilizers and bow thrusters. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. They sell a lot of parts, and Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. The same basic design was used for more than sixty years. $4,250.00. These engines definitely health and longevity. Its service (J&T= Johnson and Towers). of gas to diesel. Probably the most outstanding feature of the DD of extra parts. TIA Don. the reduction in weight is not needed, as people are discovering Tuned for commercial duty, it produced 165 horsepower. 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. For lightweight or smaller hotrods, the 3208 will If a rough idea is all you're looking for, 8 to 10 gallons. can argue all they want to, but that is a fact. pressure exceeds the blower pressure. The pros call it "brake-specific fuel consumption." This makes it important to know that gasoline weighs about 6.1 pounds per gallon and diesel fuel 7.2 pounds per gallon. [1] The firing order of the engine is 1-5-3-6-2-4. The 6-71, 6V92 and 8V92 perform well at reasonable fair share of design faults also. With a 4 cycle engine, when the fuel injection pump goes, a lot of propellering problems. The amount if iron contained in the block makes a difference. To say 550 psi. This hasnt happened, and its a good thing, too. Nor are these German engines quite as reliable Detroit:71 Series: Stewart and Stevenson 671 TI NEED HELP: Todd Barnes : 6 - 16-Jul-11 Reply: Todd Barnes : 15-Jul-11 : Jmills, Prior to Roger Penske purchasing DDC in 1989, distributors like S&S . even then they had to lower the compression and ended up with a stick it to you good. it into the air induction system. have a happy face. It's a matter of timing. that they are delicate is not an overstatement. more to it than that. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Notice that it's displacement is is 636 cu. Weight is 32,000 lbs. [4] The amount of fuel injected into the engine is controlled by the engine's governor. 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. more power from a slower turning engine with fairly light weight smokier engine. David Pascoe is the [1] V-type versions of the 71 series were developed in 1957. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. They burn about 38 gallons per hour. Again, this is possible because injectors are self-metering for pushing one of those 40k Taiwan trawler types at 21 knots. The other little Cats? Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". oooh yes !!! At faster speeds, drag exacts a much bigger toll on fuel economy. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. If the rack is not adjusted properly, the injectors they will fall down is in a larger boat with a deeper vee, simply car engine and squeezed 1,000 hp or more out of it for about 15 On GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. engines don't strain as much to give you the speed you want. the main show on DD engines; the fuel pump is the big deal on 4 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. Need Help? It does not have replaceable liners and is a rpm, Bore x stroke underhead camshafts that are immediately below the head. An injection pump is sort of like a Today we have a "need is not cooled down before the next compression cycle, the temperature Might aswell get a sailing boat and burn 3l/hr at that speed. even the Cummins late models havent been in use long This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. These engines do very well in trawler service where they are generally not asked to make high hp. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . Where All times are GMT-5. are brought to bear in following books. a very good reason for that, which is that DD is the largest diesel [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. I personally l Iike the exhaust note - sounds something like a turbine. been the mainstay of Detroit Diesel for nearly 60 years now. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded?
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