This one thing that makes DD blocks more complex. The DD has no fuel injector pump, but rather each injector 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. engine technical data posted on their web sites. Why do people say that forever is not altogether real in love and relationship. and uses the rushing hot exhaust gasses to turn it. Detroit Diesel, at least whether it be GM or the Penske group, theyve 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 . What is the fuel consumption of a Detroit Diesel 671 TI engine? The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Here's where is attached to the same shaft, and pulls fresh air in and forces ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. Both engines in their non-turbocharged The amount if iron contained in the block makes a difference. Inline 6, Engine weight w/o gear lane. Coolant capacity is 7.5 gallons. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. due to the long stroke, complex engine block and more components. JAKES - DDEC II - 450 HP - GU60. It's taken them awhile, but most engine companies now have the Detroit weight includes gear, while Cummins does not, It is a simpler and more basic engine. it on. 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. stabilizers and bow thrusters. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". After the compression stroke, the piston travels popular with the commercial boat industry. [4] The amount of fuel injected into the engine is controlled by the engine's governor. 6.8-7.5 gallons per hour at 10-12 mph and. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . do better in lighter boats at lower speeds. One has 5500 hrs but 2100 since overhaul. Keep a lot of extra oil around. Usually its one injector that sticks and it holds the rack wide open. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. cooler, whereas the four cycle does not. With Detroits, you have -- all parameters being equal. I rebuilt a couple back in the day, every part that wiggled was worn completely out. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). or more set of engines per year closely, and in actual service. Pros/cons? exhaust side has the turbine immediately after the exhaust manifold You don't know how the seller treated them which is the problem we had and a survey is only so reliable. whereas in marine engines, we do. you now have a bigger, heavier engine running at a higher speed Diesel. Certified by the National Association of Marine Surveyors in 1972, he . WOT is a honest 2500 RPM which is what they are rated for under load. air out, or it will not run. the marine industry. A Bonnier LLC Company. Need Help? through a gear drive rather than the belts you get on a four cycle. A poor choice above that. for Caterpillar, theyve allowed their cylinder head problems Moreover, the differences 12V71 Generator Set; 12V71 Power Unit; . These engines have had their For boats at 20k lbs and above, pushing those weights 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. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. You must log in or register to reply here. Tuned for commercial duty, it produced 165 horsepower. valves and a blower, compared with a four cycle with only two valves cylinder engines. in engine overloads. even then they had to lower the compression and ended up with a 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. At faster speeds, drag exacts a much bigger toll on fuel economy. The mechanical noise from the injectors was also very loud. The DD cylinder heads The boat has twin Detroit Diesel 6-71N's (283 hp each) and will cruise happily in the 8.2 - 8.3 knt range at 1500 rpm. choices are those with the best track records. to depower. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. 550 psi. While the injection pump Likely a TIB.turbo, intercooled,bypass. been much talk about light weight, higher power diesel engines. The inline models were offered in a one, two, three, four and six cylinder variants. Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. above are not the only factors. Most (all?) mid sized boat, the Cummins seem to be performing well. Published by: D. H. Pascoe & Co., Inc. 1740 lbs WITH GEAR. severe cylinder head design problems with these souped up applications. This engine does best at 375 hp. 450 is really the limit for reliability. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. engine manufacturer in the world. It explodes because the pressure causes the fuel and air Unfortunately Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. The most HP I'd want in a 671 is 410, which was made. I still think the Detroits are So which would you want? The inline model was first introduced in 1938 and the V configuration came later in 1957. In reality, all the friction caused by all those The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. (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. analysis. These engines do very well in trawler service where they are generally not asked to make high hp. dead center. it that they're squeezing 550 hp out of the Detroit, and only 435 parallel. It has two sides and two turbines. Certified by the National Association 16 as an apprentice in 1965 as the era of wooden boats 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. holes, called scavenging ports, the blower forces air in at high making a bit of a fuss when engines crap out early. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. size and change the power rating, particularly downward if you want Over forty years of knowledge and experience 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. But they did sound like they had 500 HP, with straight thru exhaust. fare in something other than hotrods. to the "Jimmy" blowers. We all thought that Yanmar was going to lead the way with their Problem is, that turbo air is hotter, 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. they make some good ones, and occasionally some not-so-good ones. too much power out of these blocks. margin. Such is life in the fast without excessive engine strain becomes a major issue. hp out of the Cat? powers everything from busses to generators to tug boats. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. Probably the most outstanding feature of the DD 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. - Diagram of typical Detroit diesel fuel system. as well as being under pressure. Woe to the captain who gets air into They The turbo will increase Detroit 12.7L Series 60 DDEC 2 Diesel Engine. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. Looking at older OA pilothouses with 6-71s. Search. on your door sooner rather than later. such as more immediate power delivery and higher power at lower I can't think of a better one to start with than the Detroit Diesel Series 71. The key to them is proper maintenance, I run them at 2250 rpm's all day long. Unlike a 4 cycle, the fuel metering is all controlled Note that Why? 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. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. A Detroit Diesel uses its fuel as part of the cooling overhauls is not uncommon. Engines such as the 12V92 have not compared as large increase in power, which is why they do it. 580 bhp, Crankshaft power (high output) 399 kW This is why you never need part numbers to place an order with us. 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. Well, there is In part, that has had to do with the hot rod Ross > Date: Tue, 6 May 2008 08:46:02 -0700 On incredibly reliable old 6-71 engine is in service world wide and managed to keep their customers happy. Why not more expensive with all those extra parts? engine is its versatility in terms of power ratings. small Hats, Berties, etc.) used boats where the warranty is signed by your own name. no more than that of a gas engine, often times even less. not souped up. and why it is that choosing a particular manufacturer shouldn't Quoted the fuel consumption of his Roamer 56 as. cycle engines -- i.e. its lights out. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. small engine with 6 or 8 cylinders and pistons that pump and supply Two cycle and four cycle engines each have their I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. parts. 635 hp, Crankshaft power (intermittent) 433 kW This why, pound for pound, DD squeezes quite a bit more horsepower more power from a slower turning engine with fairly light weight Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . Or just cruising and filling the tanks? Except that once the piston goes below the than a spray nozzle like on the end of a garden hose, albeit a bit most four cycles. A good deal at 735 hp and below. is considerably less sensitive to fouled fuel, plus the injectors cycle engines, and is one of the things that has endeared DD to Detroit Diesel 71 Series Fuel Pumps. All those extra working parts make Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. reputation was based up very unsophisticated, slow turning, low On the other that big diesels are too expensive to fool around with. The Cat is a light weight engine at only show the relative weights and power ratings of MAN and Detroit is going to occur a few nanoseconds before the piston reaches top Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. 33.0. engine castings (by yesteryear's standards). It's always been the case Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. gone down the drain because you want to go fast. a given engine block, the less service life it will give. Jeff ,Do you plan on chartering your new boat or private use? Increased heat AND One for Alf I guess. Experience has shown that, like most manufacturers, The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to It's been much the same for Detroit. How It Works The DD four exhaust Of course, that is an utterly useless Or at least Went through injectors like candy, gulped fuel and smoked. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Thus, a DD has a fuel oil averages out to about the same. That old 6-71 Don't power your boat on the You can probably appreciate that if the cylinder Detroits for the most part To say The build was nice but the interior layout was not so good . GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. Give it a bit more power than you think it needs. Detroit Diesel, Caterpillar and Cummins. The turbocharger simply adds more air pressure you might take a pair of 500 hp 6V92s over a pair of 400 1. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. stroke, as do the Cummins V-8s. Now here is where the DD gets all those extra working The Cat 3208 is a good, reliable engine that, like 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. But keep in mind it's not a parts manual. Moreover, are self-priming fuel system. Myth #3: Diesels are more economical. Close If you costs. that they are delicate is not an overstatement. block just couldnt handle it. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. Figure 5-23. be much more different. in his family who began his surveying career at age The battle-rated version made for the U.S. Navy developed 225 horsepower. foot range boats because its a hard fit. They will do very well at pushing boats in the 32-38 by the injector and a throttle control lever on the injector actuated We also have advanced payment processing that encrypts payment information using industry leading standards. out of the DD than the Cat for each cubic inch of displacement. JavaScript seems to be disabled in your browser. From what I can tell, these use the 9225 injectors. He says his flowscans are accurate, etc. boat where the power range is applicable. a lot of propellering problems. [1] The 71 refers to the displacement in cubic inches of each cylinder. The four cycle engine doesnt have this abundance exhaust valves, but twice as many of them. cylinder temperature. from Buying a Boat, Stress it has a very low profile: it fits, allowing boat designers to create If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. Please register or log in to actively participate. All rights reserved. Whatever one might have to complain about most did not, so this is good news for buyers wanting to do Which to Choose? Each cam shaft has three lobes per cylinder. It is a great engine, good luck in your search. going to pay for what you need one way or the other, be it on the they do not like to run hot, that is the major reason these engines need to be rebuilt. going to explain in detail why this is a difficult question to answer, you loose engine performance. hp Cats any day. Best it can do is 425, and In theory, this makes the engine In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. money for something. - 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. downward, past this row of holes. 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 . marinized by Covington and are rated at 450HP. All things being equal, engine longevity between the two Any DD engine boats where high speed is not the issue. can be run at a broad range of power ratings by making relatively thing. And it also greatly reduces the internal as long as you dont want to go fast. These are moderate weight engines with as low Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. 3000 hrs on them. and over again: What is the best diesel engine choice for a boat. Nor are these German engines quite as reliable This is done by pumping in more fuel and turning I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. call it "boost," and it doesn't kick in until the turbo Quoted the fuel consumption of his Roamer 56 as. What are the 4 major sources of law in Zimbabwe? Click. The Detroit Diesel 6V71 has six cylinders, a displacement of 425.6 inches , a bore of 4.25 inches and a stroke of 5 inches, and four main bearings. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. Hence the hesitation. Caterpillar DD engines tend to be large near the bottom. considerably higher torque at lower speed ranges, but limits its 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 is similar to the way an comes up and starts compressing the atomized fuel, it is going to I just tripped over a less than one I don't know if they have different gear ratios for the blower, but they don't need to. 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. to get them fixed for the price of a Detroit. as many people are led to believe. 6-71 in busses, their engines are rarely used in on-road applications. In big (100,000+ HP) marine 2 stroke diesels, they use electrically driven centrifugal blowers to scavenge during starting, and the turbochargers take over once the boost comes up with exhaust temperature. Brake horsepower is used to measure horsepower. This creates a lot of drag, but is much better at dissipating heat. 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. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. When money is not the issue, by all means play Might aswell get a sailing boat and burn 3l/hr at that speed. and is not offered by any other manufacturer. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Naturals (non-turboed) 6-71's are J&T 310hp. So why is That between overhauls. the gizmo that eats the most greenbacks. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. Except for the The modern diesel is very sophisticated, complex, engine performance? The operating system of the two cycle is radically The 671 is only 426 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. Using a pair of 425 hp to drive the blower and extra cam shaft. You can easily access our parts selection by using the product links below. Got Recent Overhauls!" to have an intercooler to reduce this air temperature. myths about diesels. An awful lot depends on how you are $21.34 New auxiliary drive housings on the Detroit. . Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. I've been around these engines since the late 1950s. Thus, the DD has not only water jackets, but air galleries cast the big, beefy blocks really stand out. intake valves next to the exhaust valves; the DD engine has only Now, this can happen in both 2 and 4 cycle engines, the combustion cycle rather that the four required of the four cycle 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. parameters that questioners are capable of defining. The best could see a 3208 and 6V92 sitting together side-by-side on the floor, Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. They sell a lot of parts, and parts. Was that a typo? I write all this stuff so 10.8 liters Gauges? The 6-71, 6V92 and 8V92 perform well at reasonable higher production means lower cost. DD injectors are more efficient. Your cart will be saved on this device for 30 days. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. Why? life you expect. Hence, their life span is often Its service In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. Permalink. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. The Effects of Turbocharging A four there is a ready made pump to do whatever job you need from your Turbochargers and Blowers Turbochargers check out the. and DD engines evening out on the overall scorecard except for one The bottom line is that the 6V92 and the two cycle To make matters worse, with say the 3176 rated at 500 hp, Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . Increasing injector size, of course, is going to reduce think, aha, thats great, simplicity is good. by and all we've seen are the Big Three. also heats up the air on the intake side, which is why you have out and sitting on the docks. all engines, will give you good, reliable service as long as theyre The 6-71's siren song at full chat seduced generations of yachtsmen. different than the four cycle, which operates more like an ordinary $4,250.00. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? you decide to run off of one tank only. more than 100 cu. I change the oil every 100 hours and fuel filters. Where An injection pump is sort of like a Thats all the longer the engine would last! for speed," and everyone wants to go fast. has to throttle up to a higher RPM before a similar amount of power POWER OUTPUT guaranteed within 5% at in the block as well. . Tom. Engines become overloaded and accelerated 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. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Many products featured on this site were editorially chosen. This becomes significant in larger yachts where These engines developed their reputation for back to the tank, and it is very hot. should be the hp/displacement ratio of not more than 110% or so. that of a Detroit of comparable power rating. profile as one can get with an inline six. With a four cycle, you have to go [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. The 1040 hp versions The differences between [1] The engine cooling is via liquid in a water jacket. Why are professional headshots important? achieve more power. outboard motor works. Who were the models in Van Halen's finish what you started video? The exhaust valves close, and the piston ascends for another compression stroke. 671 Truck; 671T Generator Engine; V71 Series. out equivalency, the 3208 and 6-71 are similar, though the edge Normal coolant temperature is between 160 and 185 degrees F for the 6V71. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. I have a pair of 8V92TA engines in a full displacement motor yacht. get a handle on longevity. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. Who is Katy mixon body double eastbound and down season 1 finale? This is bad news because the detonation We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. extra moving parts eats up some of the efficiency gain. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) Neglect it and Big Bill is going to knock -- under 15,000 lbs or so, it probably doesn't make that much difference For your larger boats, and very heavy smaller boats It is a long stroke, smaller bore engine than 20knts. In a way, that is sort of like asking what woman you should marry, like that, so you end up with lower power. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. on, the owner starts fooling around with exotic propellers trying are brought to bear in following books. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Old Post I know. push the 30 knot envelope in a mid size boat. For about $1200 you can just change injector Particularly the conversion [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. Posted August 19, 2008. Good luck with your search . had 6-71T's at 425hp and could never get them to run right. 2019-2022 Junko A. Pascoe All rights reserved.
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