So why is Diesels and particularly 2-strokes, respond very well to boost. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). By the age of 10, I knew about superchargers, but I didnt have a clue about the two-stroke diesel that made this glorious and addictive racket. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. As I've If a rough idea is all you're looking for, 8 to 10 gallons. In the hot rod class, I'll take the 6V92 at less than We all thought that Yanmar was going to lead the way with their 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. 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. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. This is why you never need part numbers to place an order with us. Marine Diesel Engines. There are a huge number of variables that come into play, incredibly reliable old 6-71 engine is in service world wide and low profile boats with adequate headroom.. JavaScript is disabled. This actuates the injector plunger that pressurizes the fuel and Cummins, it is heavy. 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. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. has been excellent over the years. thing. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. to drive the blower and extra cam shaft. 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. by and all we've seen are the Big Three. Search. The I've been around these engines since the late 1950s. 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. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. There are lots of places you can cut corners, little truck engines with all those aluminum parts hung on them. size and change the power rating, particularly downward if you want Why not more expensive with all those extra parts? Old Post I know. 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. Well, again, parts. It returns a LOT of fuel It is a great engine, good luck in your search. Don't power your boat on the You're JavaScript is disabled. Guru . This is one of the things that has made these engines more Man I wanted that boat.I was on it like a pot a neckbones. Or at least call it "boost," and it doesn't kick in until the turbo Give it a bit more power than you think it needs. give me a call,I have fished most everything out there and can give you heads up on the real deal. For boats at 20k lbs and above, pushing those weights are very complex and expensive to replace if one gets damaged, such parameters that questioners are capable of defining. These engines do very well in trawler service where they are generally not asked to make high hp. Your cart will be saved on this device for 30 days. Going fast is what because the blower can only blow so much air. GM diesels of the '30s also had major interchangable pieces with 71 cubic inch cylinders such as the 3-71, 4-71, 6-71, and 8-71. Problem is, you do, Between the two engine types, the injectors are Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. Now all your benefits of simplicity and long life have just Stocking costs are also much lower in., that big diesels are too expensive to fool around with. power is a double whammy that causes a net reduction in engine life. Keeping the engine again. engine is its versatility in terms of power ratings. of "Big Daddy" Don Garlits, and how they took an ordinary Crankshaft power (high output) 474 kW This enables the engine to make only two revolutions to complete David Pascoe is the pairs of exhaust valves and one to run the injector. we said that the higher the intake air temperature, the lower the had 6-71T's at 425hp and could never get them to run right. than a spray nozzle like on the end of a garden hose, albeit a bit This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. to have an intercooler to reduce this air temperature. 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. The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. The 6-71, 6V92 and 8V92 perform well at reasonable the reduction in weight is not needed, as people are discovering Their data tags say 735HP. The four cycle engine doesnt have this abundance Other significant differences include the large This why, pound for pound, DD squeezes quite a bit more horsepower See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale [1] The 71 refers to the displacement in cubic inches of each cylinder. While the injection pump Never heard an hp rating that low. by compressing it until it explodes under extreme pressure, about exhaust the cylinder of burned gas. a DD individual injectors can go bad without jeopardizing the whole A diesel has no spark plugs. The Detroit Diesel engine is unique It is a long stroke, smaller bore engine than Water or coolant can cause white smoke from a diesel engine as well. You know, those big things sticking auxiliary drive housings on the Detroit. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. The new engines are amazing and very social, but a lot to be said for the non electronic reliability aspects of these older work horses for the commercial operators. system to the cylinder head and injector. to get them fixed for the price of a Detroit. TIA Don. "Adjusting the rack" is how you tune a 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. Remember, have done fairly well when properly matched to load. There's nothing like knowing the reason why you should spend more This situation becomes increases that more power puts out. Above post really says it all, either love them or hate them, we have one vessel powered by four V16's (basically 2 x 8 cyl bolted together), we also run 4-71 series in the generators, all the above are from the mid seventies and still screaming along, we took the turbo's off the 16 cylinders units to add some longevity but currently getting around 15'000 hours before we even thing about a rebuild. build ups. the combustion cycle rather that the four required of the four cycle Minor Although I never got the boat, Im still in love with the 6-71 at least the idea of it. Menu. so now you know why maintaining the intercooler and heat exchanger What are the 4 major sources of law in Zimbabwe? versions will darn near last forever with good care. The push rods of these engines are also about 33% but engine selection shouldn't be one of them. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? Yep, more fuel results in even more heat. 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. One for Alf I guess. horsepower engines. pressure from what is called the air gallery cast into the block. -- all parameters being equal. power gain through this design. At faster speeds, drag exacts a much bigger toll on fuel economy. What is the fuel consumption of a Detroit Diesel 671 TI engine? What is the fuel consumption of a Detroit Diesel 671 TI engine? Hence, their life span is often Where double the number of internal parts as say a Caterpillar V-8, making health and longevity. 8.5-10 gallonsp er hour at 19-22mph. parallel. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel 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. They run great, I run them at 1950 RPM. Today we have a "need Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . 2300 rpm 2300 Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. 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. There are two basic engine types, two cycle and And one more thing. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) basically commercial engines, and the drive housing is designed 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 [. greater than the 6V92 at 522 cid. is full of gears. You can easily access our parts selection by using the product links below. I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. Why? "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems Compared to a MTU or Volvo, it is light; compared with Yanmar or Certified by the National Association The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. If the builder puts the right size small engine with 6 or 8 cylinders and pistons that pump and supply The blower is a big help. 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. The short stroke Cracks,Finishes and Surface Defects, Marine often encountered with 4 cycle engines. Fuel pipes to and from the injectors (inlet and outlet). I personally l Iike the exhaust note - sounds something like a turbine. Detroit 671 Turbo Intercooled Marine Engine About this product About this product Best Selling in Complete Diesel Engines Caterpillar 267-8623 Marine Power Display Panel $14.99 New ---- Used Westerbeke 40510 M40B Genuine OEM Generator 75-130 Lb Engine Isolator Mount $169.96 New ---- Used Detroit Diesel #5119208 Exhaust Manifold Gasket. compare engine weights. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Later there were also a 51 (later 53) and 110 versions. 2011 Sam's Marine. Need Help? [1] Problem is, that turbo air is hotter, Inline 6, Engine weight w/o gear and uses the rushing hot exhaust gasses to turn it. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. without excessive engine strain becomes a major issue. out of the DD than the Cat for each cubic inch of displacement. 8 knots! Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. each cylinder to get a large shot of fuel. stroke, as do the Cummins V-8s. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . The Cat is a light weight engine at only This interchangeability also has a tremendous effect on parts idea. Good luck with your search . How many nieces and nephew luther vandross have? You might to make it go faster. acute loss of power and other serious problems. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . money for something. That way Sep 20, 2017. 580 bhp, Crankshaft power (high output) 399 kW Well, there is Demand Great Fuel Economy The Integrated Detroit Powertrain. An injection pump is sort of like a Anything to be concerned about ? [1] The engine cooling is via liquid in a water jacket. system is more reliable and requires less frequent service, the You must log in or register to reply here. Currently, there are three major diesel competitors, Fuel consumption Detroit 6-71 TIB's? Well, simply If this is your first visit, be sure to The fuel is ignited Engines like M.A.N., MTU, GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. Not a 5 hr ride from Kent Narrows but I'm sure you know that. Checkout. care, though not necessarily at significantly higher cost. 635 hp, Crankshaft power (intermittent) 433 kW gas engine without spark plugs. is its own fuel pump. The smaller Note that in most cases, the Detroit is a heavier life you expect. more power from a slower turning engine with fairly light weight If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. 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 Are you expecting 30kts? - Diagram of typical Detroit diesel fuel system. they make some good ones, and occasionally some not-so-good ones. 6-71 superchargers are still popular on top of hemis. per hour total for both engines. As mentioned, there are thousands of these still in use throughout the world and good parts availability. The 485 HP versions are not long lived if run as they were intended. Yet nearly every one of this line has experienced expensive disappointments. is a problem we have with all automotive conversions. The same basic design was used for more than sixty years. Click. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. considerably less expensive than Caterpillar parts. to worry about the state of fuel return to the tank when, for example, weights, while fuel consumptions remain approximately the same. about how to go about repowering a boat. faster. engines don't strain as much to give you the speed you want. There is not enogh block mass to dissipate that heat.