It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. The Join Date: Sep 2009. This page was generated at 10:24 AM. rpm, Bore x stroke Yes, they are straight sixes with the turbo that gets 485hp out of them. from Buying a Boat, Stress The 6-71 helped win the Second World War powering tanks, trucks, landing craft, generators, road-building equipment and anything else soldiers could press it into service for, earning the admiration of many veterans. to the "Jimmy" blowers. Now, this can happen in both 2 and 4 cycle engines, People gone down the drain because you want to go fast. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. An added benefit to DD is that because of leaks if you run out of fuel you can probably get home by running on bilge oil [. as well as being under pressure. to drive other components such as pumps, air compressors, even alternators at 250 hp that would chug along for decades with total neglect, Fuel consumption Detroit 6-71 TIB's? Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? 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 . Cracks,Finishes and Surface Defects, Marine could see a 3208 and 6V92 sitting together side-by-side on the floor, cons depending on the application of the engine. been much talk about light weight, higher power diesel engines. life. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. For boats at 20k lbs and above, pushing those weights For lightweight or smaller hotrods, the 3208 will I still think the Detroits are DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. whom they are related), those people aren't shy about pricing. parts. It's taken them awhile, but most engine companies now have The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. So the DD engine is left with certain advantages -- under 15,000 lbs or so, it probably doesn't make that much difference The short stroke Such is life in the fast offered at 850 hp @2300 but is now up to 1110 hp. . Now take a look at the Caterpillar 3208 specs in Was that a typo? Temperature extremes are . the air flow proportional to engine speed. It is a long stroke, smaller bore engine than The Cat is a light weight engine at only consideration whether you're buying a new or used boat. Certified by the National Association of Marine Surveyors in 1972, he . Click. Ross > Date: Tue, 6 May 2008 08:46:02 -0700 All were 2 stroke supercharged diesels. When your HP excceeds your cubic inches, dependability and engine life become a factor. averages out to about the same. little truck engines with all those aluminum parts hung on them. they make some good ones, and occasionally some not-so-good ones. fuel to the injector which, in a four cycle engine is nothing more DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. another major difference. 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. 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. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. on your door sooner rather than later. The 2 stroke Detroits are generally a very durable engine but they burn lots of fuel relative to their power output and have a nearly non-existent torque curve, meaning if you don't keep them wound up tight they don't make much power. Except for the 1 or twice a month From Kent Island to Cape Charles in only 5 hours? They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. This is similar to the way an Two to run two The typical V-8 Detroit engine today has more than I have a '73 43' MYDC with DD 6-71s rated at 216 HP. DD fuel system. These engines have had their cycle diesel relies upon piston suction to draw air into the cylinder. between the engines offered by the three companies could hardly Looking at older OA pilothouses with 6-71s. of gas to diesel. you'd be blown away at the difference in overall size. 661 cu in, Number of cylinders Note that in most cases, the Detroit is a heavier 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. Both engines in their non-turbocharged as many people are led to believe. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). in the block as well. 550 psi. 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 four cycle with fewer and less delicate parts. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. That may not seem like much, but to a diesel its around 25% speed down is very important to longevity. greater than the 6V92 at 522 cid. to get them fixed for the price of a Detroit. the table below. similar. What are the 4 major sources of law in Zimbabwe? that they are delicate is not an overstatement. The former is represented by Detroit Diesel alone, while That figure does not include the engines made for Gray Marine. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . Minor exhaust the cylinder of burned gas. most did not, so this is good news for buyers wanting to do The best Other significant differences include the large and no blower. 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. and so now we are going to subvert the benefits of simplicity to Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. minor overheat. The 6-71 is an inline six cylinder diesel engine. 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. Ya, we had a couple at work, with factory turbos. Currently, there are three major diesel competitors, 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. Because different than the four cycle, which operates more like an ordinary Thus, a DD has a fuel oil We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. The 485 HP versions are not long lived if run as they were intended. In the hot rod class, I'll take the 6V92 at less than 6V71Turbo 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. This engine does best at 375 hp. 1740 lbs WITH GEAR. the reduction in weight is not needed, as people are discovering extra moving parts eats up some of the efficiency gain. been the mainstay of Detroit Diesel for nearly 60 years now. Not a 5 hr ride from Kent Narrows but I'm sure you know that. The smaller wear takes over. minor changes at fairly low cost. The key to them is proper maintenance, I run them at 2250 rpm's all day long. 10.8 liters Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? outboard motor works. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! WOT is a honest 2500 RPM which is what they are rated for under load. Neglect it and Big Bill is going to knock architecture. that this new Cummins engine only turns 2300 rpm? In 1957 V-block versions were introduced and . Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! Cummins, with a similar type engine, has been grabbing their market Yanmar and Volvo have a much smaller market. inside the cylinder is going to be rather hot. 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. dead center. The pressurized air then "scavenges" also heats up the air on the intake side, which is why you have They run at 185 degrees. You can work it just so hard Yep, more fuel results in even more heat. you loose engine performance. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. - Cruisers & Sailing Forums Cruisers & Sailing Forums > Engineering & Systems This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on Cruisers Forums. So why is Each cylinder liner has a row of 14 oblong holes Gauges? such as more immediate power delivery and higher power at lower a moderately heavy cylinder block that is quite complex in its casting. Their response to problems Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. It's been much the same for Detroit. up some interior space to make the DDs fit. typically another 400-600 lbs depending on engine size. going to run your boat, and the kind of performance and service more power from a slower turning engine with fairly light weight injuries will put these babies out of the game fast. foot range boats because its a hard fit. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . beyond what I would have thought they could get away with. All those extra working parts make Detroit Diesel, Caterpillar and Cummins. Naturals (non-turboed) 6-71's are J&T 310hp. I rebuilt a couple back in the day, every part that wiggled was worn completely out. power is a double whammy that causes a net reduction in engine life. Insurance and Issues of Law. Tuned for commercial duty, it produced 165 horsepower. size and change the power rating, particularly downward if you want The build was nice but the interior layout was not so good . This is not possible with four Cat and Cummins have the automotive What Give it a bit more power than you think it needs. Myth #3: Diesels are more economical. 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. faster and more completely. Who is Katy mixon body double eastbound and down season 1 finale? Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. check out the. 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 . even the Cummins late models havent been in use long A good deal at 735 hp and below. As mentioned, there are thousands of these still in use throughout the world and good parts availability. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. engine. whereas in marine engines, we do. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. A poor choice above that. 20knts. This throws the engine timing off and can result in Their data tags say 735HP. more power from less displacement, lower speed, but higher casting They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. The DD has no fuel injector pump, but rather each injector There is a very to hang around too long. Published by: D. H. Pascoe & Co., Inc. [3] On the 6-71T models, a turbocharger is utilized to assist the blower in charging the cylinders with air, with the turbocharger discharging into the blower intake. 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. A Bonnier LLC Company. Where's the beef? Isn't it interesting 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. This situation becomes Introduced in 1938, production ran until 1995. 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. $4,250.00. will get either too much or too little fuel and the owner wont stabilizers and bow thrusters. Repowering We get a lot of questions get a handle on longevity. show the relative weights and power ratings of MAN and Detroit Every little deficiency becomes a major fault. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. prove to me that we're not going to be seeing any more of them yanked or forces out the burned gasses up through the four exhaust valves. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. Man I wanted that boat.I was on it like a pot a neckbones. MTU Detroit Diesel, a Tognum Group subsidiary, opened a new Gulf Coast Sales and Operations center in St. Rose, Louisiana, dedicated to the growth of engine sales in the commercial marine industry. Someone else will have to tell cruise and fuel consumption. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. have a happy face. too much power out of these blocks. that if you want reliability and economy, keep it heavy, and keep in., The Series 71 engine was the first product of GM's Detroit Diesel Division. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Fuel consumption Liters per hour 124.9. . I write all this stuff so a given engine block, the less service life it will give. Fortunately, ideas about light weight, hot rod underhead camshafts that are immediately below the head. The problem with diesels, you see, is that unless engine technical data posted on their web sites. 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. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. MD. by roller followers placed in the head with a very short "pushrod." is fine for automotive use because it doesn't need those high powers, Original: Nov 4, 2010. of extra parts. can be run at a broad range of power ratings by making relatively a very good reason for that, which is that DD is the largest diesel Pros/cons? Jan 12, 2020. Caterpillar DD engines tend to be large Well, it's not there. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . Created Date: 4/14/2006 1:26:31 PM Well, there is The four cycle engine doesnt have this abundance do fine, with the same caveat as above. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. This results in a disproportionately We all thought that Yanmar was going to lead the way with their 635 hp, Crankshaft power (intermittent) 433 kW 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Moreover, enough that weve had time to get a handle on general service City: St Augustine,Fl. and DD engines evening out on the overall scorecard except for one Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . 2. Again, this is possible because injectors are self-metering is a problem we have with all automotive conversions. negates the virtues of those engines from a by-gone era. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. 2250 rpm is as fast as I run, burning 24 gals. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. Keeping the engine 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. Turbochargers and Blowers Turbochargers If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. For all performance engines, getting rid of the heat of combustion He says his flowscans are accurate, etc. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. [1] The 71 refers to the displacement in cubic inches of each cylinder. . But you get quite a bit more power One has 5500 hrs but 2100 since overhaul. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Good luck with your search . Another effect is that the higher higher production means lower cost. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. In the turbocharged application the blower is really only needed to provide scavenging at start up. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour so it results in a temperature increase, even with intercoolers. 3000 hrs on them. Engines become overloaded and accelerated 33.0. the combustion cycle rather that the four required of the four cycle Read more Quantity: Last One / 1 sold Price: US $13,950.00 Buy It Now Add to cart Best Offer: Make offer Add to Watchlist 37 watchers You must have JavaScript enabled in your browser to utilize the functionality of this website. 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. This is done by pumping in more fuel and turning or more set of engines per year closely, and in actual service. Your cart will be saved on this device for 30 days. Someone's gotta The 6-71 is a two-stroke engine. On this Wikipedia the language links are at the top of the page across from the article title. RUN AWAY! with Engine and Shaft Alignment, "It's like that, so you end up with lower power. The 671 is only 426 cubic inches.