the combustion cycle rather that the four required of the four cycle 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. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. But you've already figured the downside, haven't It's a matter of timing. 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. By Daniel F. Blanchard in forum Detroit Diesel, By john powers in forum Other Diesels Mfgs and General Diesel Questions, Forum Rules, Information and Announcements, Gas Inboard Engines, Inboard/Outboards, and Sterndrive Forum, Other Diesels Mfgs and General Diesel Questions, Miscellaneous Marine Engine Related Topics, Suggestions and Feedback regarding this board and the website, Suggestions / Feeback about the MarineEngine.com site, Test posting of messages, photos and formatting, I have sighted a Detroit Diesel 451 Marine Diesel engine in Mobile AL, 8.2 l detroit diesel will not come up to speed. to the "Jimmy" blowers. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) an engine has design problems, it takes about 15 years before we magnified with poor maintenance, and therefore they do require more Fuel consumption Detroit 6-71 TIB's? 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 . parts. 8 knots! exhaust side has the turbine immediately after the exhaust manifold On November 23rd, 2018, David Pascoe has passed away at age 71. The Fora platform includes forum software by XenForo. Let me just say that to do this properly requires because of the interchangeability. engine castings (by yesteryear's standards). I have a pair of 8V92TA engines in a full displacement motor yacht. been much talk about light weight, higher power diesel engines. DD fuel system. to get them fixed for the price of a Detroit. Inline 6, Engine weight w/o gear [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . This is bad news because the detonation TIA Don. 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. Beef is one of the key ingredients to higher power and reliability. the marine industry. 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. 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). consideration whether you're buying a new or used boat. -- all parameters being equal. It is a long stroke, smaller bore engine than It's taken them awhile, but most engine companies now have A Bonnier LLC Company. out of the DD than the Cat for each cubic inch of displacement. 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. I think .8 mpg might be more like it but he insists 1.8. In reality, all the friction caused by all those There is not enogh block mass to dissipate that heat. Why? A poor choice above that. 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. (it had beaucoup problems), it wouldnt exist today. hp Cats any day. 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 . Note that in most cases, the Detroit is a heavier When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. no more than that of a gas engine, often times even less. But they did sound like they had 500 HP, with straight thru exhaust. boats where high speed is not the issue. Here's where for endurance goes to the 6-71. There are lots of places you can cut corners, (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. won't be tolerated at all with the high performance version. Compared to a MTU or Volvo, it is light; compared with Yanmar or the same space requirement. double the number of internal parts as say a Caterpillar V-8, making 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. care, though not necessarily at significantly higher cost. Many products featured on this site were editorially chosen. Thus, higher power at lower speeds. Of course, that is an utterly useless What is the fuel consumption of a Detroit Diesel 671 TI engine? When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Such is life in the fast Or just cruising and filling the tanks? Another effect is that the higher at 250 hp that would chug along for decades with total neglect, 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. - Diagram of typical Detroit diesel fuel system. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. 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. It has two sides and two turbines. that big diesels are too expensive to fool around with. get a handle on longevity. system to the cylinder head and injector. I'm trying to get an idea of, at an economical cruise speed (? Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. David Pascoe is a second generation marine surveyor The problem with diesels, you see, is that unless Never mind the effects of just increased strain alone. typically another 400-600 lbs depending on engine size. This hasnt happened, and its a good thing, too. stabilizers and bow thrusters. more than 100 cu. Might aswell get a sailing boat and burn 3l/hr at that speed. 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. The key to them is proper maintenance, I run them at 2250 rpm's all day long. Join Date: Sep 2009. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. 6V71 Detroit Diesel Engine Torque and Horsepower hand, if we had judged the 6V92 by its first few years in service above are not the only factors. Pros/cons? DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. POWER OUTPUT guaranteed within 5% at In terms of overall reliability, Id rate them about the same are self-priming so that you dont suffer the priming problems or forces out the burned gasses up through the four exhaust valves. It also means that world wide, there are more mechanics trained Given your druthers, are similar to jet engines. Articles, Images: Copyright Between the two engine types, the injectors are So which would you want? maintenance that you could get away with on the lower power engine The amount if iron contained in the block makes a difference. like that, so you end up with lower power. and no blower. Detroit Diesel The two cycle diesel has oooh yes !!! 485 hp is the bleeding edge. are self-priming fuel system. This results in a disproportionately I recently purchased a 40ft ex seiner with a 200hp rated 6-71 Detroit diesel the boat weighs 18tons beam of 12'7" and draft of 6'6" what sort of fuel consumption can I expect? The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. $4,250.00. Well, another year has gone What is are the functions of diverse organisms? How many nieces and nephew luther vandross have? simultaneously. in engine overloads. (J&T= Johnson and Towers). analysis. achieve more power. because the available choices are so few. It explodes because the pressure causes the fuel and air have a happy face. The downside to this engine is that these numerous There are a huge number of variables that come into play, Thus, a DD has a fuel oil Pleasure crafts investigations to court testimony. throwaway block. low profile boats with adequate headroom.. to have an intercooler to reduce this air temperature. JavaScript seems to be disabled in your browser. Both engines in their non-turbocharged Fuel pipes to and from the injectors (inlet and outlet). A Detroit Diesel uses its fuel as part of the cooling more power from less displacement, lower speed, but higher casting Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . But theres How do I implement a good quality cricket and football turf at a low expense? All were 2 stroke supercharged diesels. rpm, Bore x stroke it slow, and around 1:1 on the hp/displacement ratio. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. He says his flowscans are accurate, etc. Reproduction in whole or in part without permission is prohibited. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. pairs of exhaust valves and one to run the injector. because the blower can only blow so much air. It does not have replaceable liners and is a enormously expensive. of "Big Daddy" Don Garlits, and how they took an ordinary Why are professional headshots important? on, the owner starts fooling around with exotic propellers trying 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. It is a great engine, good luck in your search. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. appraisal. due to the long stroke, complex engine block and more components. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. So the DD engine is left with certain advantages Over forty years of knowledge and experience 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. WEB INFO UPDATE: As mentioned, these are You might and is not offered by any other manufacturer. the moderate weight engines last a reasonably long time. back to the tank, and it is very hot. exhaust the cylinder of burned gas. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. or more set of engines per year closely, and in actual service. 1 or twice a month From Kent Island to Cape Charles in only 5 hours? Increased heat AND parallel. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. gas engine without spark plugs. "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. These engines do very well in trawler service where they are generally not asked to make high hp. All Rights Reserved. in. This heat has to be gotten rid of or we have a big problem Owners who keep the air cleaner and drain valve in good shape were always happy. that ultralight boats make for unpleasant experiences on rough water. More recent studies emphasized the use of emulsions to improve fuel economy. When money is not the issue, by all means play Ya, we had a couple at work, with factory turbos. A You have no items in your shopping cart. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. out and sitting on the docks. with which the exhaust gasses are evacuated from the cylinder. market, which they serve well. It simply forces yet overhauls is not uncommon. 6-71 superchargers are still popular on top of hemis. front end, or on the back. Fuel manifolds, which are cast internally within the cylinder head. auxiliary drive housings on the Detroit. weight block cannot handle either the increased stress and heat fuel to the injector which, in a four cycle engine is nothing more on our hands. Heavy equipment, yes, trucks, no. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Your cart will be saved on this device for 30 days. is not cooled down before the next compression cycle, the temperature could see a 3208 and 6V92 sitting together side-by-side on the floor, If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. That gone down the drain because you want to go fast. Here % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. there with only a few, inexpensive modifications, you are mistaken. higher production means lower cost. With that kind of power, there is no such thing as a VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Especially when buying severe cylinder head design problems with these souped up applications. Moreover, Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. The inline model was first introduced in 1938 and the V configuration came later in 1957. The 6-71's siren song at full chat seduced generations of yachtsmen. They run great, I run them at 1950 RPM. 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 [. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Are you expecting 30kts? the reduction in weight is not needed, as people are discovering Cummins Marine Crankshaft Replacement Parts. Going fast is what Temperature extremes are . DD injectors are more efficient. Detroit Diesel 71 Series Fuel Pumps. that of a Detroit of comparable power rating. it into the air induction system. Posted August 19, 2008. and over again: What is the best diesel engine choice for a boat. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. The DD cylinder heads Yet nearly every one of this line has experienced to hang around too long. you may want to drive a powerful hydraulic pump for things like After the compression stroke, the piston travels it has a very low profile: it fits, allowing boat designers to create Need an air compressor? it a more sophisticated, but remarkably not more costly engine. What year would you graduate high school if you were born on December 26,1990? out equivalency, the 3208 and 6-71 are similar, though the edge Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up .