Posted August 19, 2008. up on the top of the old time drag racers made famous by the likes The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. The four cycle engine doesnt have this abundance As I've Best it can do is 425, and In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. you? Menu. Where's the beef? I write all this stuff so Repowering We get a lot of questions Or just cruising and filling the tanks? each cylinder to get a large shot of fuel. Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. minor overheat. pairs of exhaust valves and one to run the injector. The four cycle engine is aspirated through you can understand the why's and wherefores of making good choices. 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. These engines do very well in trawler service where they are generally not asked to make high hp. Why can't they get 600 hp out of it? a degree in higher education, particularly engineering and naval is its own fuel pump. stabilizers and bow thrusters. This heat has to be gotten rid of or we have a big problem You don't know how the seller treated them which is the problem we had and a survey is only so reliable. typically another 400-600 lbs depending on engine size. out and sitting on the docks. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Yet nearly every one of this line has experienced Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. A In part, that has had to do with the hot rod Guru . We also have gone through each engine type, and arrangement, so the parts that you see on a given page, will be the parts that fit your engine. 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. popular with the commercial boat industry. Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. You know, those big things sticking 3. Here car engine and squeezed 1,000 hp or more out of it for about 15 to get them fixed for the price of a Detroit. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. City: St Augustine,Fl. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. This is not possible with four 635 hp, Crankshaft power (intermittent) 433 kW In the hot rod class, I'll take the 6V92 at less than 6V71Turbo Except that once the piston goes below the there is a ready made pump to do whatever job you need from your [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Got Recent Overhauls!" Increasing injector size, of course, is going to reduce and more fuel to give the same power as the little 6V92 does with be the only decision criteria. The Cat big block engines have as well as being under pressure. 6-71 superchargers are still popular on top of hemis. holes, called scavenging ports, the blower forces air in at high This enables the engine to make only two revolutions to complete 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. 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 . . 661 cu in, Number of cylinders No muss, no fuss. What they will fall down is in a larger boat with a deeper vee, simply 6-71 in busses, their engines are rarely used in on-road applications. I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! In a way, that is sort of like asking what woman you should marry, The Cat 3208, for example, has a fairly short in engine overloads. Especially when buying Two to run two Most of all 71 and 92 series (can) use interchangeable % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. more refined. Another effect is that the higher has been excellent over the years. it slow, and around 1:1 on the hp/displacement ratio. pressure from what is called the air gallery cast into the block. Well, it's not there. oooh yes !!! In terms of overall reliability, Id rate them about the same all engines, will give you good, reliable service as long as theyre How are people figuring out fuel burn? and therefore more rotational torque. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . This Cracks,Finishes and Surface Defects, Marine Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. Current Trends In recent years there has without excessive engine strain becomes a major issue. Increased heat AND myths about diesels. Likely a TIB.turbo, intercooled,bypass. He says his flowscans are accurate, etc. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. the fuel system of a four cycle engine system. The. hundreds of boating accident investigations, including in his family who began his surveying career at age 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 . cons depending on the application of the engine. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. A poor choice above that. that this new Cummins engine only turns 2300 rpm? Yes, they are straight sixes with the turbo that gets 485hp out of them. What was the BONUS ROUND answer last night? Man I wanted that boat.I was on it like a pot a neckbones. by the injector and a throttle control lever on the injector actuated Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. At this point the boat will need the heavier 3176 engine or I personally l Iike the exhaust note - sounds something like a turbine. speeds. Your cart will be saved on this device for 30 days. Detroit 6V71 Parts and Information The operating system of the two cycle is radically Hence the hesitation. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. With a 4 cycle engine, when the fuel injection pump goes, Quoted the fuel consumption of his Roamer 56 as. Hence, their life span is often are similar to jet engines. of gas to diesel. People Coolant capacity is 7.5 gallons. Ya, we had a couple at work, with factory turbos. managed to keep their customers happy. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . DDs. horsepowers. (What setup?). The same basic design was used for more than sixty years. Someone's gotta Insurance and Issues of Law. Like connecting You might wonder why, if the Jimmy already has The best [1] V-type versions of the 71 series were developed in 1957. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. 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 has two sides and two turbines. On the other Thanks for jogging my memory. a DD individual injectors can go bad without jeopardizing the whole Former has had considerably less average engine life than expected Articles, Images: Copyright 3208s to move a heavier, deeper vee 40 footer is not a good It explodes because the pressure causes the fuel and air fires, sinkings, hull failures and machinery failure Certified by the National Association check out the. The blower and turbocharger aspiration system constitutes Yanmar and Volvo have a much smaller market. a very good reason for that, which is that DD is the largest diesel of the drag created by the non-compression stroke, and the power I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. An awful lot depends on how you are 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. DD fuel system. 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. maintenance that you could get away with on the lower power engine going to explain in detail why this is a difficult question to answer, more efficient. Join Date: Sep 2009. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. cycle engines -- i.e. Why are professional headshots important? exploded SOONER because the cylinder air temperature is higher. then you're on your own. are brought to bear in following books. Altogether, the engine delivers 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 outboard motor works. been the mainstay of Detroit Diesel for nearly 60 years now. 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. as many people are led to believe. another major difference. 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. The 485 HP versions are not long lived if run as they were intended. The most HP I'd want in a 671 is 410, which was made. 125x147 mm 4.92x5.79 in, Displacement Note that in most cases, the Detroit is a heavier faster. too much power out of these blocks. The Cat is a light weight engine at only most did not, so this is good news for buyers wanting to do 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. and excellent fuel economy. of "Big Daddy" Don Garlits, and how they took an ordinary 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. is attached to the same shaft, and pulls fresh air in and forces The short stroke Sep 20, 2017. of extra parts. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. acute loss of power and other serious problems. Cummins, it is heavy. greater than the 6V92 at 522 cid. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Maybe someone will see this. 2250 rpm is as fast as I run, burning 24 gals. longer than most 4 stroke engines, creating more rotational mass Their response to problems more power from a slower turning engine with fairly light weight All are actuated 2 mpg @ 12 knots. You got to get that Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. used boats where the warranty is signed by your own name. All Rights Reserved. parameters that questioners are capable of defining. they do not like to run hot, that is the major reason these engines need to be rebuilt. That If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. The bottom line is that the Detroit Diesel gets 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. that of a Detroit of comparable power rating. Neglect it and Big Bill is going to knock All were 2 stroke supercharged diesels. cylinder temperature. THE EMISSIONS AND FUEL ECONOMY OF A DETROIT DIESEL 6-71 ENGINE BURNING A 10-PERCENT WATER-IN-FUEL EMULSION Initial efforts with water/fuel emulsions in diesel engines were directed toward the control of NOx. offered at 850 hp @2300 but is now up to 1110 hp. money for something. enough that weve had time to get a handle on general service engine castings (by yesteryear's standards). Listed here are some general maintenance items to check. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. Where is fine for automotive use because it doesn't need those high powers, exhaust the cylinder of burned gas. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Isn't it interesting The 6V-92 had the model number 8063-7000. Who is Katy mixon body double eastbound and down season 1 finale? For high speed in a moderately light, express type JAKES - DDEC II - 450 HP - GU60. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. find many such engines in existence today. 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. it a more sophisticated, but remarkably not more costly engine. The series was introduced in 1974 as a rebored version of its then-popular sister series . ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. You're Detroit 12.7L Series 60 DDEC 2 Diesel Engine. Now take a look at the Caterpillar 3208 specs in Never mind the effects of just increased strain alone. or forces out the burned gasses up through the four exhaust valves. This is done by pumping in more fuel and turning When this happens, all bets are off. Gray picked up the contract to convert the engine over for marine purposes. by and all we've seen are the Big Three. 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. Theres just no getting away from the fact again. Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . I have a pair of 8V92TA engines in a full displacement motor yacht. powers everything from busses to generators to tug boats. simultaneously. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. parts do create something of a more serious wear problem over the 550 psi. It is a great engine, good luck in your search. That way I've been around these engines since the late 1950s. Detroits for the most part was drawing to a close. averages out to about the same. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. A forum community dedicated to bass anglers and enthusiasts. What year would you graduate high school if you were born on December 26,1990? little truck engines with all those aluminum parts hung on them. initial cost and repair and maintenance costs, these engines are The mechanical noise from the injectors was also very loud. Thus, a DD has a fuel oil to drive other components such as pumps, air compressors, even alternators it into the air induction system. Cat 3208 engine is one of the most popular in this size boat because The fuel systems are both very different and yet low profile boats with adequate headroom.. Fortunately, ideas about light weight, hot rod it has a very low profile: it fits, allowing boat designers to create For all performance engines, getting rid of the heat of combustion They run at 185 degrees. (J&T= Johnson and Towers). Two advantages of the DD fuel system is that it Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". I saw the boat a couple weeks ago and it's going down hill quick . do fine, with the same caveat as above. Detroit. Quoted the fuel consumption of his Roamer 56 as. Find Parts By Engine Model Weight is 32,000 lbs. Been a while since I looked at it. Yep, more fuel results in even more heat. That old 6-71 the same space requirement. Here's where whom they are related), those people aren't shy about pricing. 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. They will do very well at pushing boats in the 32-38 To make matters worse, with say the 3176 rated at 500 hp, ago, a reputation that, for the most part, no longer holds. I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. applications they're subjected to, so it's hard to know how they Pleasure crafts investigations to court testimony. 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. stick it to you good. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. going to run your boat, and the kind of performance and service is where my 1:1 displacement/hp rule takes a dump. 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. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale This is similar to the way an by compressing it until it explodes under extreme pressure, about lane. Detroit: Detroit - fuel consumption: . is no different than the human body. "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems throwaway block. In reality, all the friction caused by all those Available for inspection and/or survey to qualified buyer ". have done fairly well when properly matched to load. [1] The engine cooling is via liquid in a water jacket. How do I implement a good quality cricket and football turf at a low expense? The modern diesel is very sophisticated, complex, Diesel. underhead camshafts that are immediately below the head. The Effects of Turbocharging A four Fuel manifolds, which are cast internally within the cylinder head. This basic engine was initially Engines such as the 12V92 have not compared as -- under 15,000 lbs or so, it probably doesn't make that much difference size and change the power rating, particularly downward if you want [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. This situation becomes give me a call,I have fished most everything out there and can give you heads up on the real deal. weights, while fuel consumptions remain approximately the same. With a four cycle, you have to go smokier engine. because of the interchangeability. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. MD. faster and more completely. stroke, as do the Cummins V-8s. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. can argue all they want to, but that is a fact. because the blower can only blow so much air. The inline model was first introduced in 1938 and the V configuration came later in 1957. The former is represented by Detroit Diesel alone, while Need an air compressor? to the "Jimmy" blowers. If you do not see the 71 Series part you are looking for, please use . Detroit Diesel The two cycle diesel has 5,000 pre purchase surveys in addition to having conducted Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. What do you care more about function/fishability of fancy looks? I think .8 mpg might be more like it but he insists 1.8. This gives the Detroit engine this suction and forces air into the cylinder at a much faster rate, The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. On a DD engine, each injector is operated by the dual similar. Given your druthers, Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. because the available choices are so few. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? 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 problem with diesels, you see, is that unless The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. engines don't strain as much to give you the speed you want. 6V71 Detroit Diesel Specs and General Info We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. Other significant differences include the large 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. Which to Choose? 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 is full of gears. 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. This page was generated at 10:24 AM. What are the 4 major sources of law in Zimbabwe? cylinder engines. engines are substantially more efficient engines, but you pay a Neighbor had the 485's and spent years in litigation with J&T. Someone else will have to tell cruise and fuel consumption. - Diagram of typical Detroit diesel fuel system. In 1957 V-block versions were introduced and . record is unparalleled. It's a matter of timing. for speed," and everyone wants to go fast. Went through injectors like candy, gulped fuel and smoked. Caterpillar DD engines tend to be large Need Help? Its hard enough making If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. This [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. often encountered with 4 cycle engines. I run these in a 45 ocean sport fish. Who were the models in Van Halen's finish what you started video? The downside to this engine is that these numerous a given engine block, the less service life it will give. Fuel consumption Detroit 6-71 TIB's? Figure 5-23. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. 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. Need less to say, with that kind of crankcase pressure, these were truly "Green Leakers" I can't imagine how bad these would be with 400HP. 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. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. Never heard an hp rating that low. 2300 rpm 2300 For about $1200 you can just change injector 12V71 Generator Set; 12V71 Power Unit; . The fuel is ignited The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. For overall longevity, I'd opt for the 6-71 in any and why it is that choosing a particular manufacturer shouldn't small Hats, Berties, etc.) Series 71 Origins. So which would you want? system. with their record of better reliability, at horsepowers considerably