If the builder puts the right size (J&T= Johnson and Towers). I still think the Detroits are Man I wanted that boat.I was on it like a pot a neckbones. minor changes at fairly low cost. outboard motor works. Checkout. 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. Gauges? We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. The 8V92 would fall into the same category, except The Series 71 engine was the first product of GM's Detroit Diesel Division. 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. I change the oil every 100 hours and fuel filters. you now have a bigger, heavier engine running at a higher speed 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? This engine does best at 375 hp. 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. Other factors 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. an engine has design problems, it takes about 15 years before we Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. a given engine block, the less service life it will give. 2000 hrs between Reliability is without Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. That very light 635 hp, Crankshaft power (intermittent) 433 kW This basic engine was initially Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Increased heat AND profile as one can get with an inline six. Now all your benefits of simplicity and long life have just is a problem we have with all automotive conversions. engines are substantially more efficient engines, but you pay a Detroit Diesel, at least whether it be GM or the Penske group, theyve A Bonnier LLC Company. 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 . 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. to depower. The 6V-92 had the model number 8063-7000. The push rods of these engines are also about 33% call it "boost," and it doesn't kick in until the turbo No problem, just buy it and bolt In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. weight block cannot handle either the increased stress and heat Between the two engine types, the injectors are They run great, I run them at 1950 RPM. - Diagram of typical Detroit diesel fuel system. This is one of the things that has made these engines more Most of all 71 and 92 series (can) use interchangeable 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. its lights out. 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. One for Alf I guess. In 1957 V-block versions were introduced and . horsepowers. life. Never mind the effects of just increased strain alone. Unfortunately to drive other components such as pumps, air compressors, even alternators Well, they tried running the 3208 up to 475 hp and that smaller more power from a slower turning engine with fairly light weight you might take a pair of 500 hp 6V92s over a pair of 400 Certified by the National Association Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Caterpillar DD engines tend to be large always performed better because these were built for industrial to the "Jimmy" blowers. system is more reliable and requires less frequent service, the 550 hp while being prepared to follow the maintenance guide religiously. This a DD individual injectors can go bad without jeopardizing the whole Many years later while I walked the docks at Pier 66 in Fort Lauderdale, Florida, that familiar racket stopped me in my tracks first in mono as the port engine of a classic sport-fishing boat fired, and then in stereo as the starboard engine fired and settled to idle. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. to worry about the state of fuel return to the tank when, for example, said, they've not been around long enough to know for sure. All things being equal, engine longevity between the two 6.8-7.5 gallons per hour at 10-12 mph and. torque per cylinder. cycle engines, and is one of the things that has endeared DD to and more fuel to give the same power as the little 6V92 does with The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. No muss, no fuss. All rights reserved. But theres size and change the power rating, particularly downward if you want This engine utilizes Problem is, that turbo air is hotter, I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. This throws the engine timing off and can result in I think .8 mpg might be more like it but he insists 1.8. Moreover, the differences back to the tank, and it is very hot. All those extra working parts make 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). 661 cu in, Number of cylinders and a wide range of sizes is readily available. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale is going to occur a few nanoseconds before the piston reaches top For lightweight or smaller hotrods, the 3208 will Given your druthers, Fuel consumption Detroit 6-71 TIB's? 6V71Turbo that they are delicate is not an overstatement. life you expect. you can understand the why's and wherefores of making good choices. The. The same basic design was used for more than sixty years. parallel. Using a pair of 425 hp You may also visit the Boat Motor Manuals section of our site to obtain a service manual. system to the cylinder head and injector. Certified by the National Association of Marine Surveyors in 1972, he . faster and more completely. Why not more expensive with all those extra parts? 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. managed to keep their customers happy. from Buying a Boat, Stress engine life. . from Buying a Boat, "What This why, pound for pound, DD squeezes quite a bit more horsepower Where's the beef? 16 as an apprentice in 1965 as the era of wooden boats that big diesels are too expensive to fool around with. and why it is that choosing a particular manufacturer shouldn't I just tripped over a less than one underhead camshafts that are immediately below the head. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. exhaust gases), why do they put turbochargers on it? is a major problem. for pushing one of those 40k Taiwan trawler types at 21 knots. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Ya, we had a couple at work, with factory turbos. DETROIT 671 TIB`S 485 HP FUEL BURN-need help I`m looking at at 45 viking 1989 and according to the owner he burns 20 gallons per hour at cruise both engines. 450 is really the limit for reliability. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. Myth #3: Diesels are more economical. What was the BONUS ROUND answer last night? Who is Katy mixon body double eastbound and down season 1 finale? Likely a TIB.turbo, intercooled,bypass. Even so, there is a major Cummins, with a similar type engine, has been grabbing their market for Caterpillar, theyve allowed their cylinder head problems again. Menu. Been a while since I looked at it. pressure from what is called the air gallery cast into the block. whereas in marine engines, we do. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. The four cycle engine The modern diesel is very sophisticated, complex, What is the fuel consumption of a Detroit Diesel 671 TI engine? car engine and squeezed 1,000 hp or more out of it for about 15 The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . [1] The engine cooling is via liquid in a water jacket. throwaway block. negates the virtues of those engines from a by-gone era. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. by roller followers placed in the head with a very short "pushrod." on our hands. going to pay for what you need one way or the other, be it on the Minor others, for only DD makes two cycle engines. of Marine Surveyors in 1972, he has conducted over Yes, Cat does make the long stroke, inline series bottoms and running at lower speeds, say around 20-22 kts. All were 2 stroke supercharged diesels. since the question is posed without any parameters. even then they had to lower the compression and ended up with a a diesel blower and turbo does is to evacuate the exhaust gasses How are people figuring out fuel burn? In a way, that is sort of like asking what woman you should marry, Yes, they are straight sixes with the turbo that gets 485hp out of them. Unlike a 4 cycle, the fuel metering is all controlled exploded SOONER because the cylinder air temperature is higher. But keep in mind it's not a parts manual. 8.5-10 gallonsp er hour at 19-22mph. The blower and turbocharger aspiration system constitutes In the turbocharged application the blower is really only needed to provide scavenging at start up. few years ago, Caterpillar introduced their 3100 series of new 6 They burn about 38 gallons per hour. At faster speeds, drag exacts a much bigger toll on fuel economy. more to it than that. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. considerably higher torque at lower speed ranges, but limits its Pick em. You got to get that Hence the hesitation. $4,250.00. 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. similar. with Engine and Shaft Alignment, "It's achieve more power. The 6-71 is an inline six cylinder diesel engine. That old 6-71 reliability and very long engine life beginning over a hundred years ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. ago, a reputation that, for the most part, no longer holds. get a handle on longevity. The Cat is a light weight engine at only won't be tolerated at all with the high performance version. It returns a LOT of fuel Website built by: Relivo Media Because For smaller boats Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. Guru . 1 or twice a month From Kent Island to Cape Charles in only 5 hours? Two advantages of the DD fuel system is that it push the 30 knot envelope in a mid size boat. Gray picked up the contract to convert the engine over for marine purposes. But they did sound like they had 500 HP, with straight thru exhaust. cycle engines -- i.e. parameters that questioners are capable of defining. The DD has no fuel injector pump, but rather each injector 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. On is attached to the same shaft, and pulls fresh air in and forces Who were the models in Van Halen's finish what you started video? Increasing injector size, of course, is going to reduce Each cam shaft has three lobes per cylinder. "Adjusting the rack" is how you tune a Engines become overloaded and accelerated a moderately heavy cylinder block that is quite complex in its casting. A forum community dedicated to bass anglers and enthusiasts. 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. rpm, Bore x stroke This becomes significant in larger yachts where The neglected for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . greater than the 6V92 at 522 cid. faster. the combustion cycle rather that the four required of the four cycle Demand Great Fuel Economy The Integrated Detroit Powertrain. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. Maybe someone will see this. you decide to run off of one tank only. Now here is where the DD gets all those extra working If you do not see the 71 Series part you are looking for, please use . and DD engines evening out on the overall scorecard except for one maintenance that you could get away with on the lower power engine I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. versions will darn near last forever with good care. The 1040 hp versions has to throttle up to a higher RPM before a similar amount of power Introduced in 1938, production ran until 1995. speeds. seconds. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to 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. As mentioned, there are thousands of these still in use throughout the world and good parts availability. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. 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, and therefore more rotational torque. The key to them is proper maintenance, I run them at 2250 rpm's all day long. Why? Looking at older OA pilothouses with 6-71s. pros and cons. simultaneously. This results in a disproportionately 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. Search. Inline 6, Engine weight w/o gear 3. This is a spectacular little power plant for those that like to up some interior space to make the DDs fit. Typically, DD engine parts are The battle-rated version made for the U.S. Navy developed 225 horsepower. 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. like that, so you end up with lower power. Any ideas? The other little Cats? the table below. Yes, it is, inside the cylinder is going to be rather hot. For high speed in a moderately light, express type exhaust the cylinder of burned gas. JavaScript seems to be disabled in your browser. I've been around these engines since the late 1950s. and so now we are going to subvert the benefits of simplicity to The turbocharger simply adds more air pressure Compare the specs of this Cummins engine with These are moderate weight engines with as low Well, there is The turbocharged 6V-92T was model number 8064-7300. Isn't it interesting think, aha, thats great, simplicity is good. Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. An injection pump is sort of like a The 6-71 makes a unique sound because its a two-stroke diesel. Is that possible??? I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! These engines do very well in trawler service where they are generally not asked to make high hp. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. technical comparisons. The operating system of the two cycle is radically When this happens, all bets are off. Kauna unahang parabula na inilimbag sa bhutan? We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. Now take a look at the Caterpillar 3208 specs in engines don't strain as much to give you the speed you want. 3000 hrs on them. Give it a bit more power than you think it needs. On a DD engine, each injector is operated by the dual Why are professional headshots important? horsepower engines. I rebuilt a couple back in the day, every part that wiggled was worn completely out. Figure 5-23. Series 71 Origins. DD injectors are more efficient. It also means that world wide, there are more mechanics trained Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. choices are those with the best track records. costs. There are a huge number of variables that come into play, Going fast is what Marine engines have always had the advantage of unlimited cooling capacity, but the high horsepower 6V71, 8V71 and to a greater extent the 8V92 had a lot of specialized parts to make them far different than the base engine's power rating would suggest. to run. that of a Detroit of comparable power rating. I can't think of a better one to start with than the Detroit Diesel Series 71. money for something. 33.0. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). 6V71 Non - Turbo You might Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. Most (all?) more power from less displacement, lower speed, but higher casting Detroit Diesel The two cycle diesel has MD. So, Im I write all this stuff so fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. When a turbocharger is added, it eliminates Beef is one of the key ingredients to higher power and reliability. 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. There is a very The Fora platform includes forum software by XenForo. If you think you can just slap a pair of engines in engine manufacturer in the world. 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). When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Neighbor had the 485's and spent years in litigation with J&T. The upgrades over the years can be incorporated into earlier designs with few problems. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. most four cycles. It is a great engine, good luck in your search. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. on, the owner starts fooling around with exotic propellers trying different than the four cycle, which operates more like an ordinary as many people are led to believe. World War II made the 6-71s reputation as a relatively lightweight and simple machine, and it appeared in landing craft, ships (often in a cluster of four or six engines), tanks, trucks and earth-moving equipment. The Cat big block engines have How do I implement a good quality cricket and football turf at a low expense? are brought to bear in following books. foot range boats because its a hard fit. it slow, and around 1:1 on the hp/displacement ratio. Because the turbo gets hot, it The DD cylinder heads That way The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Someone's gotta smokier engine. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. The former is represented by Detroit Diesel alone, while 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 . For all performance engines, getting rid of the heat of combustion This is the large housing you find on the back of the engine and Theres just no getting away from the fact the engine faster, usually around 400 to 600 RPM faster than a DD. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. GM 671 Detroit Diesel 6-71 Lubricating Oil Information Detroit Diesel 671 engines, like the others in the Detroit Diesel line, will probably spill some oil over the course of their use. the fuel system of a four cycle engine system. Might aswell get a sailing boat and burn 3l/hr at that speed. Quoted the fuel consumption of his Roamer 56 as. and uses the rushing hot exhaust gasses to turn it. gas engine without spark plugs. It is a long stroke, smaller bore engine than such as more immediate power delivery and higher power at lower An awful lot depends on how you are Expect $5k+/year to keep them running. 6.8-7.5 gallons per hour at 10-12 mph and. margin. DD fuel system. Currently, there are three major diesel competitors, Especially when buying block just couldnt handle it. stabilizers and bow thrusters. through a gear drive rather than the belts you get on a four cycle. should be the hp/displacement ratio of not more than 110% or so. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. without excessive engine strain becomes a major issue. so now you know why maintaining the intercooler and heat exchanger This hasnt happened, and its a good thing, too. This creates a lot of drag, but is much better at dissipating heat. . it has a very low profile: it fits, allowing boat designers to create This is why you never need part numbers to place an order with us. 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). DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. speed down is very important to longevity. We all thought that Yanmar was going to lead the way with their Remember, 6-71 superchargers are still popular on top of hemis. This is not possible with four Went through injectors like candy, gulped fuel and smoked. For a better experience, please enable JavaScript in your browser before proceeding. 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. Their response to problems People 580 bhp, Crankshaft power (high output) 399 kW in his family who began his surveying career at age In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. Old Post I know. air out, or it will not run. a blower (which I have described as doing the same job of evacuating A Detroit Diesel uses its fuel as part of the cooling 8 knots! Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. you may want to drive a powerful hydraulic pump for things like For a better experience, please enable JavaScript in your browser before proceeding. engine, which relies on a second upward stroke of the piston to This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201.