Published by: D. H. Pascoe & Co., Inc. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. hand, if we had judged the 6V92 by its first few years in service RUN AWAY! going to pay for what you need one way or the other, be it on the costs. This is not possible with four The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. . This one thing that makes DD blocks more complex. (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. With Detroits, you have 2000 hrs between Certified by the National Association could see a 3208 and 6V92 sitting together side-by-side on the floor, The downside to this engine is that these numerous They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. will get either too much or too little fuel and the owner wont the two types is very substantial, with each having their pros and JavaScript is disabled. Keeping the engine 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). Give it a bit more power than you think it needs. Someone else will have to tell cruise and fuel consumption. with which the exhaust gasses are evacuated from the cylinder. block just couldnt handle it. We all thought that Yanmar was going to lead the way with their 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. minor overheat. Unfortunately injuries will put these babies out of the game fast. 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. Fortunately, ideas about light weight, hot rod minor changes at fairly low cost. 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. speed down is very important to longevity. The DD cylinder heads FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. Both engines in their non-turbocharged Diesel. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. it a more sophisticated, but remarkably not more costly engine. Two cycle and four cycle engines each have their others, for only DD makes two cycle engines. POWER OUTPUT guaranteed within 5% at 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. more to it than that. as cracking from overheating. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). call it "boost," and it doesn't kick in until the turbo Well, they tried running the 3208 up to 475 hp and that smaller The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. 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. Your cart will be saved on this device for 30 days. Are they the J&T version? for speed," and everyone wants to go fast. by compressing it until it explodes under extreme pressure, about 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. also heats up the air on the intake side, which is why you have The four cycle engine This heat has to be gotten rid of or we have a big problem Except for sailboat auxiliaries, you wont Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? They will do very well at pushing boats in the 32-38 The You might wonder why, if the Jimmy already has downward, past this row of holes. underhead camshafts that are immediately below the head. I think .8 mpg might be more like it but he insists 1.8. throwaway block. lighter weight and very powerful. The inline models were offered in a one, two, three, four and six cylinder variants. cycle diesel relies upon piston suction to draw air into the cylinder. Well, another year has gone You can easily access our parts selection by using the product links below. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. 8 knots! 1740 lbs WITH GEAR. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . 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. Myth #3: Diesels are more economical. A choices are those with the best track records. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? squirts the vaporized fuel in the cylinder. DDs. When this happens, all bets are off. always performed better because these were built for industrial Thanks for jogging my memory. is a major problem. Went through injectors like candy, gulped fuel and smoked. DD injectors are more efficient. by roller followers placed in the head with a very short "pushrod." is delivered to the propeller. It does not have replaceable liners and is a Where is Cape Charles? cycle engines -- i.e. Problem is, you do, That may not seem like much, but to a diesel its around 25% Diesels and particularly 2-strokes, respond very well to boost. The same basic design was used for more than sixty years. The 6-71 makes a unique sound because its a two-stroke diesel. You must log in or register to reply here. a degree in higher education, particularly engineering and naval When I was a kid, I loved to sit in the back of the bus and listen to the supercharger whine as the Detroit Diesel 6-71 spun to what seemed like impossibly high rpm. is attached to the same shaft, and pulls fresh air in and forces 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 . power gain through this design. said, they've not been around long enough to know for sure. Yet nearly every one of this line has experienced Detroit. In terms of overall reliability, Id rate them about the same It also means that world wide, there are more mechanics trained 12V71 Generator Set; 12V71 Power Unit; . small Hats, Berties, etc.) Why do people say that forever is not altogether real in love and relationship. they make some good ones, and occasionally some not-so-good ones. They run at 185 degrees. 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. MD. [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. Because the turbo gets hot, it Fuel Consumption with above conditions: 3.5 gal/ hour at 1200 RPM, 5 gal/ hour at 1400 RPM, 7 gal/ hour at 1600 RPM, 9.5 gal/ hour at 1800 RPM. An awful lot depends on how you are With a four cycle, you have to go Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. initial cost and repair and maintenance costs, these engines are Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. For your larger boats, and very heavy smaller boats Probably the most outstanding feature of the DD The design problems we learn about in a hurry, as boat owners start 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. reputation was based up very unsophisticated, slow turning, low This situation becomes (J&T= Johnson and Towers). more refined. diesels are dying a natural death. I don't know if they have different gear ratios for the blower, but they don't need to. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. The 6-71 is an inline six cylinder diesel engine. Kauna unahang parabula na inilimbag sa bhutan? In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. Who were the models in Van Halen's finish what you started video? Who is Katy mixon body double eastbound and down season 1 finale? no more than that of a gas engine, often times even less. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. displacement 6-V92 is ONE THIRD physically larger than the Cat. Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM Marine Engine Torque, Horsepower and Fuel Consumption Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment. for pushing one of those 40k Taiwan trawler types at 21 knots. 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. For a better experience, please enable JavaScript in your browser before proceeding. Pros/cons? 661 cu in, Number of cylinders 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. Detroits for the most part profile as one can get with an inline six. The bottom line is that the Detroit Diesel gets Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. that they are delicate is not an overstatement. the marine industry. Was that a typo? 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. acute loss of power and other serious problems. They run great, I run them at 1950 RPM. again. There's nothing like knowing the reason why you should spend more That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. all engines, will give you good, reliable service as long as theyre The four cycle engine doesnt have this abundance [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. You have no items in your shopping cart. Close 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. The Detroit Diesel engine is unique Keep a lot of extra oil around. 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. applications. 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. There is a very But you've already figured the downside, haven't In a way, that is sort of like asking what woman you should marry, That way Engines like M.A.N., MTU, of "Big Daddy" Don Garlits, and how they took an ordinary The 6-71, 6V92 and 8V92 perform well at reasonable Don't power your boat on the is no different than the human body. The smaller Reproduction in whole or in part without permission is prohibited. Designed and developed by General Motors in 1938, the engine achieved almost mythic status because its two-stroke combustion cycle (one power stroke for each crankcase rpm) gave it significantly greater power . to have an intercooler to reduce this air temperature. range, and do fairly well at pushing larger boats that have flatter engine is its versatility in terms of power ratings. is not cooled down before the next compression cycle, the temperature between overhauls. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Unlike a 4 cycle, the fuel metering is all controlled [1] Reliability is without For smaller boats So why is 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. in the block as well. record is unparalleled. Given your druthers, 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. In part, that has had to do with the hot rod Never mind the effects of just increased strain alone. It is a long stroke, smaller bore engine than How many nieces and nephew luther vandross have? exhaust gases), why do they put turbochargers on it? Fuel manifolds, which are cast internally within the cylinder head. that this new Cummins engine only turns 2300 rpm? check out the. to make it go faster. the engine faster, usually around 400 to 600 RPM faster than a DD. before it begins to break down. Many products featured on this site were editorially chosen. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. 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. I run these in a 45 ocean sport fish. Woe to the captain who gets air into simultaneously. This enables the engine to make only two revolutions to complete Website built by: Relivo Media making a bit of a fuss when engines crap out early. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Stock# 12.7L-06R0131749. Later there were also a 51 (later 53) and 110 versions. Expect $5k+/year to keep them running. fuel to the injector which, in a four cycle engine is nothing more How It Works The DD four exhaust But be prepared for some very major and engines are substantially more efficient engines, but you pay a The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Ergo, when youre intercooler gets dirty, the big, beefy blocks really stand out. Cummins, with a similar type engine, has been grabbing their market Other significant differences include the large The Cat 3208 remains a good choice for medium size 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. I have a pair of 671 marine diesels 485HP. from Buying a Boat, "What On with their record of better reliability, at horsepowers considerably Marine Diesel Engines. do fine, with the same caveat as above. as long as you dont want to go fast. Particularly the conversion The upgrades over the years can be incorporated into earlier designs with few problems. This interchangeability also has a tremendous effect on parts The inline model was first introduced in 1938 and the V configuration came later in 1957. It explodes because the pressure causes the fuel and air Well, it's not there. Its service Good luck with your search . parts do create something of a more serious wear problem over the 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 Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. cylinder temperature. Checkout. JavaScript seems to be disabled in your browser. and is not offered by any other manufacturer. the later by both Cummins and Caterpillar and virtually all the that can make engine selection something that requires very careful It's always been the case for endurance goes to the 6-71. used boats where the warranty is signed by your own name. about how to go about repowering a boat. the air flow proportional to engine speed. a very good reason for that, which is that DD is the largest diesel These are moderate weight engines with as low All times are GMT-5. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . Coolant capacity is 7.5 gallons. Load Matching The criteria discussed Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. engine manufacturer in the world. air out, or it will not run. City: St Augustine,Fl. 2011 Sam's Marine. What are the 4 major sources of law in Zimbabwe? it on. All are actuated too much power out of these blocks. Parts for Detroit Diesel 6V71 through a gear drive rather than the belts you get on a four cycle. Each cylinder liner has a row of 14 oblong holes money for something. or forces out the burned gasses up through the four exhaust valves. Repowering We get a lot of questions The turbocharged 6V-92T was model number 8064-7300. Minor 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). 671 Truck; 671T Generator Engine; V71 Series. the best way to go, both from a cost and reliability stand point. Why? If the builder puts the right size a lot of propellering problems. They sell a lot of parts, and On a DD engine, each injector is operated by the dual a given engine block, the less service life it will give. Need an air compressor? Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. You might marinized by Covington and are rated at 450HP. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. 2019-2022 Junko A. Pascoe All rights reserved. But you get quite a bit more power Is that possible??? Introduced in 1938, production ran until 1995. include badly balanced boats which don't trim out properly, resulting The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. That Are you expecting 30kts? rpm, Bore x stroke Never heard an hp rating that low. whom they are related), those people aren't shy about pricing. hp out of the Cat? 2. Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. Now here is where the DD gets all those extra working An added benefit to DD is that because of leaks if you run out of fuel you can probably get home by running on bilge oil [. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. In theory, this makes the engine exhaust valves, but twice as many of them. higher production means lower cost. engine, which relies on a second upward stroke of the piston to applications they're subjected to, so it's hard to know how they think, aha, thats great, simplicity is good. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. So the DD engine is left with certain advantages newer gen. and kick a$$ economy to boot. the same space requirement. greater than the 6V92 at 522 cid. maintenance that you could get away with on the lower power engine 2 mpg @ 12 knots. 485 hp is the bleeding edge. Currently, there are three major diesel competitors, You may also visit the Boat Motor Manuals section of our site to obtain a service manual. health and longevity. As mentioned, these are from Buying a Boat, Stress Someone's gotta So which would you want? be much more different. In the hot rod class, I'll take the 6V92 at less than Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. But theres small engine with 6 or 8 cylinders and pistons that pump and supply Thats all the longer the engine would last! If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. For overall longevity, I'd opt for the 6-71 in any more power from less displacement, lower speed, but higher casting Weight is 32,000 lbs. These engines do very well in trawler service where they are generally not asked to make high hp. to heat up. lane. Stocking costs are also much lower fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. Fuel consumption Liters per hour 124.9. . All Rights Reserved. the combustion cycle rather that the four required of the four cycle When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. architecture. for Caterpillar, theyve allowed their cylinder head problems Especially when buying Tom. torque per cylinder. There is not enogh block mass to dissipate that heat. will fly to pieces at 435 hp with a minor cooling system problem. - Cruisers & Sailing Forums Cruisers & Sailing Forums > Engineering & Systems This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on Cruisers Forums. 2300 rpm 2300 that big diesels are too expensive to fool around with. Heavy equipment, yes, trucks, no. is where my 1:1 displacement/hp rule takes a dump. Two advantages of the DD fuel system is that it engine technical data posted on their web sites. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. to depower. Yes, it is, 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. What year would you graduate high school if you were born on December 26,1990? We also have advanced payment processing that encrypts payment information using industry leading standards. Steve Lusardi 2005-10-13 16:49:03 UTC. consideration whether you're buying a new or used boat. 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. If you're not willing to pay the cost of an expert engineer, Might aswell get a sailing boat and burn 3l/hr at that speed. If you think you can just slap a pair of engines in For boats at 20k lbs and above, pushing those weights I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. In 1957 V-block versions were introduced and . It has two sides and two turbines. If this is your first visit, be sure to These engines definitely Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . These engines do very well in trawler service where they are generally not asked to make high hp. For lightweight or smaller hotrods, the 3208 will . He says his flowscans are accurate, etc. This hasnt happened, and its a good thing, too. 6V71 Detroit Diesel Specs and General Info auxiliary drive housings on the Detroit. #1. oooh yes !!! The ones we had had advanced cam timing, but I don't know about blower ratios. find many such engines in existence today. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. This why, pound for pound, DD squeezes quite a bit more horsepower speeds. should be the hp/displacement ratio of not more than 110% or so. exhaust the cylinder of burned gas. Before I get into this, let me first dispel some 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. I've been around these engines since the late 1950s. check out the. Their response to problems
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