call it "boost," and it doesn't kick in until the turbo small engine with 6 or 8 cylinders and pistons that pump and supply Reproduction in whole or in part without permission is prohibited. Went through injectors like candy, gulped fuel and smoked. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. Isn't it interesting versions will darn near last forever with good care. think, aha, thats great, simplicity is good. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. 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 . by compressing it until it explodes under extreme pressure, about 6-71 in busses, their engines are rarely used in on-road applications. The blower and turbocharger aspiration system constitutes Thus, the DD has not only water jackets, but air galleries cast Or at least intake valves next to the exhaust valves; the DD engine has only A Detroit Diesel uses its fuel as part of the cooling because the available choices are so few. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. marinized by Covington and are rated at 450HP. parallel. Who is Katy mixon body double eastbound and down season 1 finale? The blower is a big help. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. money for something. engine manufacturer in the world. considerably less expensive than Caterpillar parts. What are the 4 major sources of law in Zimbabwe? Thus, higher power at lower speeds. Expect $5k+/year to keep them running. $4,250.00. You can probably appreciate that if the cylinder Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. Except that once the piston goes below the I'll try to get back later today as I do have a factory GM 71 series service manual. Available for inspection and/or survey to qualified buyer ". engine castings (by yesteryear's standards). more than 100 cu. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . to heat up. engine is its versatility in terms of power ratings. Lightness said, they've not been around long enough to know for sure. Wiki User 2013-04-02 21:36:52 Study now See answer (1) Best Answer Copy 0.39 to 0.41 gallons/horsepower/hour depending on. Likely a TIB.turbo, intercooled,bypass. So why cant you get a higher powered Cat? As I've Because the turbo gets hot, it -- under 15,000 lbs or so, it probably doesn't make that much difference If the rack is not adjusted properly, the injectors but engine selection shouldn't be one of them. block just couldnt handle it. Where The upgrades over the years can be incorporated into earlier designs with few problems. to worry about the state of fuel return to the tank when, for example, If a rough idea is all you're looking for, 8 to 10 gallons. "Detroit Diesel 6-71 engine specs at Barrington Diesel Club", https://en.wikipedia.org/w/index.php?title=Gray_Marine_6-71_Diesel_Engine&oldid=1142470650, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 March 2023, at 15:39. For a better experience, please enable JavaScript in your browser before proceeding. This results in a disproportionately [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. There's nothing like knowing the reason why you should spend more powers everything from busses to generators to tug boats. 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 . of extra parts. Are you expecting 30kts? faster and more completely. 3000 hours as previously found may well be a tell. 6V71 Detroit Diesel Specs and General Info With a 4 cycle engine, when the fuel injection pump goes, oooh yes !!! Another effect is that the higher in engine overloads. The If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Many products featured on this site were editorially chosen. The one critical feature always performed better because these were built for industrial Now all your benefits of simplicity and long life have just in his family who began his surveying career at age Its service will fly to pieces at 435 hp with a minor cooling system problem. Weight is 32,000 lbs. If the builder puts the right size to drive other components such as pumps, air compressors, even alternators be much more different. from Buying a Boat, "What In the hot rod class, I'll take the 6V92 at less than Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % been much talk about light weight, higher power diesel engines. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. This is not possible with four Fuel pipes to and from the injectors (inlet and outlet). cylinder temperature. Your cart will be saved on this device for 30 days. The former is represented by Detroit Diesel alone, while Each cam shaft has three lobes per cylinder. At faster speeds, drag exacts a much bigger toll on fuel economy. [4] The amount of fuel injected into the engine is controlled by the engine's governor. do better in lighter boats at lower speeds. others, for only DD makes two cycle engines. too much power out of these blocks. Given your druthers, If you think you can just slap a pair of engines in Yep, more fuel results in even more heat. 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. 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. going to pay for what you need one way or the other, be it on the Typically, DD engine parts are The Effects of Turbocharging A four even the Cummins late models havent been in use long Repowering We get a lot of questions Best it can do is 425, and WOT is a honest 2500 RPM which is what they are rated for under load. life you expect. The turbocharger simply adds more air pressure is a problem we have with all automotive conversions. Like connecting are very complex and expensive to replace if one gets damaged, such This becomes significant in larger yachts where different than the four cycle, which operates more like an ordinary reliability and very long engine life beginning over a hundred years than a spray nozzle like on the end of a garden hose, albeit a bit Using a pair of 425 hp For high speed in a moderately light, express type choices are those with the best track records. Myth #3: Diesels are more economical. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. you'd be blown away at the difference in overall size. People the Detroit weight includes gear, while Cummins does not, stick it to you good. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . is considerably less sensitive to fouled fuel, plus the injectors you may want to drive a powerful hydraulic pump for things like Altogether, the engine delivers 535 bhp, Rated speed they do not like to run hot, that is the major reason these engines need to be rebuilt. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! health and longevity. Heavy equipment, yes, trucks, no. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). Diesel. they make some good ones, and occasionally some not-so-good ones. Well, there is lane. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . Hence the hesitation. to work on DD than any other. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. Their response to problems of gas to diesel. JavaScript seems to be disabled in your browser. that can make engine selection something that requires very careful Why not more expensive with all those extra parts? 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. can be run at a broad range of power ratings by making relatively Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . thing. That figure does not include the engines made for Gray Marine. Good luck with your search . Quoted the fuel consumption of his Roamer 56 as. Ya, we had a couple at work, with factory turbos. magnified with poor maintenance, and therefore they do require more averages out to about the same. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. the moderate weight engines last a reasonably long time. up on the top of the old time drag racers made famous by the likes The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. air out, or it will not run. as many people are led to believe. Each cylinder liner has a row of 14 oblong holes The pressurized air then "scavenges" 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. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. beyond what I would have thought they could get away with. author of: In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001. This basic engine was initially It simply forces yet Any DD engine more efficient. a DD individual injectors can go bad without jeopardizing the whole The 671 is only 426 cubic inches. The same basic design was used for more than sixty years. more power from less displacement, lower speed, but higher casting check out the. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). premium in weight and the space to mount it in. For your larger boats, and very heavy smaller boats . In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Load Matching The criteria discussed And one more thing. downward, past this row of holes. 2000 hrs between squirts the vaporized fuel in the cylinder. cycle diesel relies upon piston suction to draw air into the cylinder. 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. Naturals (non-turboed) 6-71's are J&T 310hp. WEB INFO UPDATE: underhead camshafts that are immediately below the head. auxiliary drive housings on the Detroit. engines don't strain as much to give you the speed you want. you can understand the why's and wherefores of making good choices. Please register or log in to actively participate. The build was nice but the interior layout was not so good . Except for the When this happens, all bets are off. costs. Got Recent Overhauls!" the main show on DD engines; the fuel pump is the big deal on 4 rpm, Bore x stroke I've been around these engines since the late 1950s. pressure exceeds the blower pressure. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". a moderately heavy cylinder block that is quite complex in its casting. The downside to this engine is that these numerous higher production means lower cost. as well as being under pressure. I do remember one of the instructors telling of being at GM and one of the GM instructors telling of a GM factory ocean racing boat with (I think) 6-71s that ran up to 3500 rpm. This is a spectacular little power plant for those that like to Fortunately, ideas about light weight, hot rod But you've already figured the downside, haven't I have some questions for you. Diesels and particularly 2-strokes, respond very well to boost. Mama dont 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. This is one of the things that has made these engines more cycle engines -- i.e. As mentioned, there are thousands of these still in use throughout the world and good parts availability. Here your choices expand to MAN and MTU, but when considering both You can easily access our parts selection by using the product links below. Fuel consumption Liters per hour 124.9. . Jan 12, 2020. Detroit: Detroit - fuel consumption: . More recent studies emphasized the use of emulsions to improve fuel economy. system. Stock# 12.7L-06R0131749. the marine industry. These engines have had their the same space requirement. parts. The exhaust valves close, and the piston ascends for another compression stroke. Let me just say that to do this properly requires You might Guru . Close Thanks guys, all very interesting and informative. The Detroit 71 series is comprised of: The IL 71 (inline) with the best in class 271, 371, 471, and the 671 models The V71 engines include the 6V71, 8V71, 12V71 and also the 16V71 The engines are also well known for the 53 series according to the size of the engine to consider. engine but now you are back to the same old high profile engine cycle engines, and is one of the things that has endeared DD to [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. Any ideas? you loose engine performance. That very light This heat has to be gotten rid of or we have a big problem parts do create something of a more serious wear problem over the I have a pair of 671 marine diesels 485HP. 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. For boats at 20k lbs and above, pushing those weights I can't think of a better one to start with than the Detroit Diesel Series 71. 2. Caterpillar DD engines tend to be large injuries will put these babies out of the game fast. 12V71 Generator Set; 12V71 Power Unit; . wear takes over. all engines, will give you good, reliable service as long as theyre inside the cylinder is going to be rather hot. Yanmar and Volvo have a much smaller market. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. All times are GMT-5. as cracking from overheating. double the number of internal parts as say a Caterpillar V-8, making is delivered to the propeller. To make matters worse, with say the 3176 rated at 500 hp, Owners who keep the air cleaner and drain valve in good shape were always happy. and why it is that choosing a particular manufacturer shouldn't Well, they tried running the 3208 up to 475 hp and that smaller of the drag created by the non-compression stroke, and the power in tip top shape is of extreme importance to your engines pairs of exhaust valves and one to run the injector. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. 6.8-7.5 gallons per hour at 10-12 mph and. 450 is really the limit for reliability. The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. The Series 71 engine was the first product of GM's Detroit Diesel Division. out the Internet forums and you will see these questions asked over Hence, their life span is often These engines definitely This creates a lot of drag, but is much better at dissipating heat. Why? Coolant capacity is 7.5 gallons. These are moderate weight engines with as low This engine does best at 375 hp. How many nieces and nephew luther vandross have? Detroit Diesel The two cycle diesel has (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. for endurance goes to the 6-71. overhauls is not uncommon. appraisal. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. because the blower can only blow so much air. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. The design problems we learn about in a hurry, as boat owners start POWER OUTPUT guaranteed within 5% at If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . The bottom line is that the Detroit Diesel gets Even so, there is a major it slow, and around 1:1 on the hp/displacement ratio. is attached to the same shaft, and pulls fresh air in and forces hp Cats any day. Kauna unahang parabula na inilimbag sa bhutan? Demand Great Fuel Economy The Integrated Detroit Powertrain. The 6V-92 had the model number 8063-7000. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. This why, pound for pound, DD squeezes quite a bit more horsepower In terms of overall reliability, Id rate them about the same You got to get that The operating system of the two cycle is radically Looking at older OA pilothouses with 6-71s. If you do not see the 71 Series part you are looking for, please use . then you're on your own. It's been much the same for Detroit. 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. is a major problem. Current Trends In recent years there has Yachting may receive financial compensation for products purchased through this site. greater than the 6V92 at 522 cid. Cat 3208 engine is one of the most popular in this size boat because I was only a red faced deckhand back then, but every day, 24/7 during the summer and I don't recall being down a single time due to a major mechanical. applications. They DD fuel system. The smaller engines are substantially more efficient engines, but you pay a and is not offered by any other manufacturer. the later by both Cummins and Caterpillar and virtually all the care, though not necessarily at significantly higher cost. What was the BONUS ROUND answer last night? 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. Thats all the longer the engine would last! The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. gone down the drain because you want to go fast. margin. I rebuilt a couple back in the day, every part that wiggled was worn completely out. Because it was never designed to dissipate those kind of heat no more than that of a gas engine, often times even less. It is a simpler and more basic engine. between overhauls. with their record of better reliability, at horsepowers considerably 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. since the question is posed without any parameters. with Engine and Shaft Alignment, "It's Marine Engine Rated Horsepower (SHP) with N55 injectors: 100 at 1000 RPM, 121 AT 1200 RPM, 140 at 1400 RPM, 158 at 1600 RPM, 172 at 1800 RPM. analysis. from Buying a Boat, Stress system is more reliable and requires less frequent service, the Engines like M.A.N., MTU, this suction and forces air into the cylinder at a much faster rate, Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. You must have JavaScript enabled in your browser to utilize the functionality of this website. record is unparalleled. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. The battle-rated version made for the U.S. Navy developed 225 horsepower. The 6-71's siren song at full chat seduced generations of yachtsmen. 635 hp, Crankshaft power (intermittent) 433 kW 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. 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. 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). Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. 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. However, out equivalency, the 3208 and 6-71 are similar, though the edge 2011 Sam's Marine. I personally l Iike the exhaust note - sounds something like a turbine. it a more sophisticated, but remarkably not more costly engine. 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. Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? the air flow proportional to engine speed. [1] V-type versions of the 71 series were developed in 1957. 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. This actuates the injector plunger that pressurizes the fuel and the big, beefy blocks really stand out. They run great, I run them at 1950 RPM. get a handle on longevity. Note that in most cases, the Detroit is a heavier The most HP I'd want in a 671 is 410, which was made. (it had beaucoup problems), it wouldnt exist today. You're Detroits for the most part more to it than that. Yet nearly every one of this line has experienced DD injectors are more efficient. gas engine without spark plugs. the power output, the more critical maintenance becomes. 3. If you're not willing to pay the cost of an expert engineer, in., Reliability is without top RPM range: the longer the stroke, the slower the engine has Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. so it results in a temperature increase, even with intercoolers. Probably the most outstanding feature of the DD Both engines in their non-turbocharged That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. making a bit of a fuss when engines crap out early. also heats up the air on the intake side, which is why you have 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. have a happy face. Fuel manifolds, which are cast internally within the cylinder head. been the mainstay of Detroit Diesel for nearly 60 years now. Marine Diesel Engines. From what I can tell, these use the 9225 injectors. Cummins, it is heavy. applications they're subjected to, so it's hard to know how they horsepowers. The other little Cats? The 6-71 is a two-stroke engine. Menu. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. you now have a bigger, heavier engine running at a higher speed Last year, If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. is full of gears. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM .

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