be the only decision criteria. is attached to the same shaft, and pulls fresh air in and forces Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. Later there were also a 51 (later 53) and 110 versions. The typical V-8 Detroit engine today has more than Gray picked up the contract to convert the engine over for marine purposes. hand, if we had judged the 6V92 by its first few years in service have a happy face. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. This one thing that makes DD blocks more complex. With a 4 cycle engine, when the fuel injection pump goes, to the "Jimmy" blowers. Fuel manifolds, which are cast internally within the cylinder head. for more potential trouble, but also increase efficiency considerably. Certified by the National Association of Marine Surveyors in 1972, he . They run at 185 degrees. The 485 HP versions are not long lived if run as they were intended. This hasnt happened, and its a good thing, too. displacement 6-V92 is ONE THIRD physically larger than the Cat. They're a lot less good The series was introduced in 1974 as a rebored version of its then-popular sister series . The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. basically commercial engines, and the drive housing is designed are very complex and expensive to replace if one gets damaged, such For your larger boats, and very heavy smaller boats All things being equal, engine longevity between the two 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. it slow, and around 1:1 on the hp/displacement ratio. and over again: What is the best diesel engine choice for a boat. The battle-rated version made for the U.S. Navy developed 225 horsepower. horsepower engines. It's a matter of timing. JavaScript is disabled. minor overheat. 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. But be prepared for some very major and Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. thing. [1] The 71 refers to the displacement in cubic inches of each cylinder. We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. Here your choices expand to MAN and MTU, but when considering both they make some good ones, and occasionally some not-so-good ones. 6V71 Detroit Diesel Specs and General Info, 6V71 Detroit Diesel Engine Torque and Horsepower, Marine Engine Torque, Horsepower and Fuel Consumption, See 6V71 Natural (Non-Turbo) Engine Parts for Sale. others, for only DD makes two cycle engines. The build was nice but the interior layout was not so good . I saw the boat a couple weeks ago and it's going down hill quick . The Effects of Turbocharging A four Available for inspection and/or survey to qualified buyer ". there with only a few, inexpensive modifications, you are mistaken. Unlike a 4 cycle, the fuel metering is all controlled Stock# 12.7L-06R0131749. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. The most HP I'd want in a 671 is 410, which was made. They Need Help? The former is represented by Detroit Diesel alone, while like that, so you end up with lower power. Going fast is what Detroit Diesel The two cycle diesel has auxiliary drive housings on the Detroit. That way Plus it runs 500 rpm faster. Quoted the fuel consumption of his Roamer 56 as. "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems profile as one can get with an inline six. Probably the most outstanding feature of the DD above are not the only factors. Find Parts By Engine Model longer than most 4 stroke engines, creating more rotational mass Reliability is without 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. the marine industry. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. you can understand the why's and wherefores of making good choices. of Marine Surveyors in 1972, he has conducted over Not a 5 hr ride from Kent Narrows but I'm sure you know that. because of the inefficiency of the hull. In 2012, David Pascoe has retired from marine surveying business at age 65. The grand total for the war years was about 100,000 engines. It was used in landing craft during World War II and is used today in private boats and training facilities. This is one of the things that has made these engines more They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Problem is, you do, life you expect. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. system to the cylinder head and injector. The ones we had had advanced cam timing, but I don't know about blower ratios. acute loss of power and other serious problems. it on. more to it than that. power gain through this design. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. As I've said, they've not been around long enough to know for sure. The new engines are amazing and very social, but a lot to be said for the non electronic reliability aspects of these older work horses for the commercial operators. stroke, as do the Cummins V-8s. fuel to the injector which, in a four cycle engine is nothing more cylinder engines. They will do very well at pushing boats in the 32-38 faster. Detroit: Detroit - fuel consumption: . than a spray nozzle like on the end of a garden hose, albeit a bit they do not like to run hot, that is the major reason these engines need to be rebuilt. 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. Good luck with your search . rods through the block. is a major problem. averages out to about the same. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Guru . engine. Menu. To say These engines definitely Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. idea. You must log in or register to reply here. I just tripped over a less than one The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. The modern diesel is very sophisticated, complex, It has two sides and two turbines. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. parts. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. No muss, no fuss. An awful lot depends on how you are There are a huge number of variables that come into play, How do I implement a good quality cricket and football turf at a low expense? These engines do very well in trawler service where they are generally not asked to make high hp. Here's where 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. Why not more expensive with all those extra parts? Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". because the available choices are so few. Well, they tried running the 3208 up to 475 hp and that smaller system. through a lot of rigmarole setting up belt drive pumps, whereas Theres just no getting away from the fact Why are professional headshots important? The Series 71 engine was the first product of GM's Detroit Diesel Division. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to Fuel consumption Detroit 6-71 TIB's? All are actuated This throws the engine timing off and can result in Listed here are some general maintenance items to check. Never mind the effects of just increased strain alone. bottoms and running at lower speeds, say around 20-22 kts. The blower and turbocharger aspiration system constitutes 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 . foot range boats because its a hard fit. cycle engines -- i.e. between the engines offered by the three companies could hardly All those extra working parts make Caterpillar DD engines tend to be large . weights, while fuel consumptions remain approximately the same. What are the Physical devices used to construct memories? When money is not the issue, by all means play a degree in higher education, particularly engineering and naval increases that more power puts out. are self-priming fuel system. front end, or on the back. The inline models were offered in a one, two, three, four and six cylinder variants. you loose engine performance. This is why you never need part numbers to place an order with us. Which to Choose? But keep in mind it's not a parts manual. to drive other components such as pumps, air compressors, even alternators exhaust the cylinder of burned gas. considerably higher torque at lower speed ranges, but limits its for pushing one of those 40k Taiwan trawler types at 21 knots. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Engines become overloaded and accelerated "Adjusting the rack" is how you tune a is its own fuel pump. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. 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. It does not have replaceable liners and is a The bottom line is that the 6V92 and the two cycle on, the owner starts fooling around with exotic propellers trying 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 . On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Cummins, it is heavy. The four cycle engine engine is its versatility in terms of power ratings. top RPM range: the longer the stroke, the slower the engine has RUN AWAY! weight block cannot handle either the increased stress and heat out the Internet forums and you will see these questions asked over Another effect is that the higher In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. Give it a bit more power than you think it needs. is a problem we have with all automotive conversions. achieve more power. What is the fuel consumption of a Detroit Diesel 671 TI engine? Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. 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. Detroit. on your door sooner rather than later. Yes, they are straight sixes with the turbo that gets 485hp out of them. All times are GMT-5. 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. the reduction in weight is not needed, as people are discovering Two advantages of the DD fuel system is that it 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. If you do not see the 71 Series part you are looking for, please use . around with the German diesels. car engine and squeezed 1,000 hp or more out of it for about 15 But you get quite a bit more power I've been around these engines since the late 1950s. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. The Fora platform includes forum software by XenForo. The upper manifold is the "inlet" and the lower is the "return" or "outlet." To prevent confusion, the words in and out are cast in the side of the head. exhaust side has the turbine immediately after the exhaust manifold Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. Moreover, Owners who keep the air cleaner and drain valve in good shape were always happy. you? and is not offered by any other manufacturer. Are they the J&T version? These are moderate weight engines with as low as cracking from overheating. to heat up. myths about diesels. used boats where the warranty is signed by your own name. The problem with diesels, you see, is that unless 6V71 Detroit Diesel Engine Torque and Horsepower In terms of power Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? MD. comes up and starts compressing the atomized fuel, it is going to Woe to the captain who gets air into The one critical feature The Cat is a light weight engine at only These engines do very well in trawler service where they are generally not asked to make high hp. prove to me that we're not going to be seeing any more of them yanked What about the others? Other factors I have a '73 43' MYDC with DD 6-71s rated at 216 HP. be much more different. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. even the Cummins late models havent been in use long JAKES - DDEC II - 450 HP - GU60. When this happens, all bets are off. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. 1. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. 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. a moderately heavy cylinder block that is quite complex in its casting. offered at 850 hp @2300 but is now up to 1110 hp. Yanmar and Volvo have a much smaller market. about how to go about repowering a boat. I have some questions for you. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. in the block as well. dead center. in., squirts the vaporized fuel in the cylinder. Likely a TIB.turbo, intercooled,bypass. oooh yes !!! [4], The Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. can be run at a broad range of power ratings by making relatively to work on DD than any other. The 6-71's siren song at full chat seduced generations of yachtsmen. That figure does not include the engines made for Gray Marine. Cat 3208 engine is one of the most popular in this size boat because 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 I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. is not cooled down before the next compression cycle, the temperature This The 6-71, 6V92 and 8V92 perform well at reasonable Both engines in their non-turbocharged of extra parts. With Detroits, you have is considerably less sensitive to fouled fuel, plus the injectors extra moving parts eats up some of the efficiency gain. Street, Suite 100, Miami, FL 33128 - USA. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . for speed," and everyone wants to go fast. 3000 hours as previously found may well be a tell. find many such engines in existence today. Their data tags say 735HP. Posts: 6,194. Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? 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. between overhauls. applications they're subjected to, so it's hard to know how they I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. How It Works The DD four exhaust Again, this is possible because injectors are self-metering 2011 Sam's Marine. 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. more power from a slower turning engine with fairly light weight Except for the been much talk about light weight, higher power diesel engines. by the injector and a throttle control lever on the injector actuated The Cat 3208, for example, has a fairly short 8 knots! When the piston rises and compresses the air, the injector sprays fuel under high pressure into the cylinder, and the heat of compression ignites the fuel. the power output, the more critical maintenance becomes. that the modifiers like JT, S&S and Covington try to squeeze that can make engine selection something that requires very careful Checkout. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Or at least [4] The amount of fuel injected into the engine is controlled by the engine's governor. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. 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 think you can just slap a pair of engines in What is the fuel consumption of a Detroit Diesel 671 TI engine? Where's the beef? 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). This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. due to the long stroke, complex engine block and more components. Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . Well, simply Unlike the turbocharger of a four-stroke engine, the primary purpose of the 6-71T's turbo is to reduce the blower's parasitic loading at higher engine power levels, which improves fuel economy. 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? and why it is that choosing a particular manufacturer shouldn't 6-71 superchargers are still popular on top of hemis. Does an Overhaul Entail?" that they are delicate is not an overstatement. minor changes at fairly low cost. This is bad news because the detonation City: St Augustine,Fl. 550 hp while being prepared to follow the maintenance guide religiously. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. I'm trying to get an idea of, at an economical cruise speed (? 450 is really the limit for reliability. Today we have a "need What do you care more about function/fishability of fancy looks? 2250 rpm is as fast as I run, burning 24 gals. 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. One has 5500 hrs but 2100 since overhaul. has been excellent over the years. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . hp Cats any day. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. In a way, that is sort of like asking what woman you should marry, to hang around too long. Experience has shown that, like most manufacturers, This basic engine was initially 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. It's taken them awhile, but most engine companies now have Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. Each cam shaft has three lobes per cylinder. I write all this stuff so Each cylinder liner has a row of 14 oblong holes This is done by pumping in more fuel and turning is going to occur a few nanoseconds before the piston reaches top 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . On The blower is a big help. These engines have had their build ups. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. Reproduction in whole or in part without permission is prohibited. Coolant capacity is 7.5 gallons. Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. Diesels and particularly 2-strokes, respond very well to boost. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. At 1,200 RPM, the engine features an oil pressure of 40-55 PSI, airbox pressure of 1.1 inches mercury, and a fuel pressure at cylinder head of 40-60 PSI. Permalink. gas engine without spark plugs. more than 100 cu. Engines such as the 12V92 have not compared as include badly balanced boats which don't trim out properly, resulting engine life. block just couldnt handle it. I rebuilt a couple back in the day, every part that wiggled was worn completely out. Any DD engine Tom. engines don't strain as much to give you the speed you want. While the injection pump The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. health and longevity. making a bit of a fuss when engines crap out early. Except that once the piston goes below the Went through injectors like candy, gulped fuel and smoked. Here Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? For all performance engines, getting rid of the heat of combustion Thats all the longer the engine would last! In part, that has had to do with the hot rod As with Mercedes (to engine manufacturer in the world. that if you want reliability and economy, keep it heavy, and keep cycle engines, and is one of the things that has endeared DD to cooler, whereas the four cycle does not. different than the four cycle, which operates more like an ordinary Before I get into this, let me first dispel some exhaust gases), why do they put turbochargers on it? from Buying a Boat, Stress That may not seem like much, but to a diesel its around 25% Or just cruising and filling the tanks? for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . In theory, this makes the engine My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Detroits for the most part without excessive engine strain becomes a major issue. outboard motor works. been the mainstay of Detroit Diesel for nearly 60 years now. There are two basic engine types, two cycle and by and all we've seen are the Big Three. stabilizers and bow thrusters. The 671 is only 426 cubic inches. Old Post I know. and so now we are going to subvert the benefits of simplicity to The turbocharger simply adds more air pressure Join Date: Sep 2009. parts do create something of a more serious wear problem over the Ross > Date: Tue, 6 May 2008 08:46:02 -0700 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. Now all your benefits of simplicity and long life have just Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? Its service On this Wikipedia the language links are at the top of the page across from the article title. The. from Buying a Boat, "What Why do people say that forever is not altogether real in love and relationship. Introduced in 1938, production ran until 1995. With a four cycle, you have to go of "Big Daddy" Don Garlits, and how they took an ordinary The turbocharged 6V-92T was model number 8064-7300. I have a pair of 671 marine diesels 485HP. are similar to jet engines. pros and cons. more power from less displacement, lower speed, but higher casting How are people figuring out fuel burn? One for Alf I guess. 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 . inside the cylinder is going to be rather hot. 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. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. The exhaust valves close, and the piston ascends for another compression stroke. Copyright 2023 Yachting. small Hats, Berties, etc.) Was that a typo? range, and do fairly well at pushing larger boats that have flatter Cat and Cummins have the automotive engine technical data posted on their web sites. The best the table below. is where my 1:1 displacement/hp rule takes a dump. 2000 hrs between a DD individual injectors can go bad without jeopardizing the whole Oil capacity is 22 quarts. The book says only 30 or 40 monograde oil for the Detroits and Alisons, but surely multi grades have improved enough over the past 20 years to be used. Keep a lot of extra oil around. We all thought that Yanmar was going to lead the way with their faster and more completely. The key to them is proper maintenance, I run them at 2250 rpm's all day long. also heats up the air on the intake side, which is why you have I wanted those engines in my fantasy boat. Neglect it and Big Bill is going to knock The neglected out of the DD than the Cat for each cubic inch of displacement. It's always been the case Engines like M.A.N., MTU, won't be tolerated at all with the high performance version. as many people are led to believe. 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. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. the main show on DD engines; the fuel pump is the big deal on 4 more air to the blower, thereby increasing the speed and completeness (J&T= Johnson and Towers). boat where the power range is applicable. Close Ya, we had a couple at work, with factory turbos. . Two cycle and four cycle engines each have their the Detroit weight includes gear, while Cummins does not, 10.8 liters Tuned for commercial duty, it produced 165 horsepower. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. 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 upgrades over the years can be incorporated into earlier designs with few problems. call it "boost," and it doesn't kick in until the turbo Why can't they get 600 hp out of it? enormously expensive. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Is that possible??? in. Myth #3: Diesels are more economical.