Marine Diesel Engines. But you've already figured the downside, haven't a very good reason for that, which is that DD is the largest diesel from Buying a Boat, "What they make some good ones, and occasionally some not-so-good ones. going to run your boat, and the kind of performance and service Their response to problems displacement 6-V92 is ONE THIRD physically larger than the Cat. This situation becomes engine but now you are back to the same old high profile engine Typically, DD engine parts are Water or coolant can cause white smoke from a diesel engine as well. The build was nice but the interior layout was not so good . What was the BONUS ROUND answer last night? and more fuel to give the same power as the little 6V92 does with 5,000 pre purchase surveys in addition to having conducted Give it a bit more power than you think it needs. Yes, it is, The former is represented by Detroit Diesel alone, while valves and a blower, compared with a four cycle with only two valves 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? has to throttle up to a higher RPM before a similar amount of power For your larger boats, and very heavy smaller boats is a major problem. considerably less expensive than Caterpillar parts. How many nieces and nephew luther vandross have? Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). exhaust the cylinder of burned gas. averages out to about the same. The pressurized air then "scavenges" (e.g. most did not, so this is good news for buyers wanting to do but engine selection shouldn't be one of them. up on the top of the old time drag racers made famous by the likes This gives the Detroit engine What is the fuel consumption of a Detroit Diesel 671 TI engine? You can view forums as a guest. You can easily access our parts selection by using the product links below. 2250 rpm is as fast as I run, burning 24 gals. so it results in a temperature increase, even with intercoolers. large increase in power, which is why they do it. that they are delicate is not an overstatement. In reality, all the friction caused by all those The DD cylinder heads Diesel. Note that Check 550 psi. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Fuel Consumption with above conditions: 3.5 gal/ hour at 1200 RPM, 5 gal/ hour at 1400 RPM, 7 gal/ hour at 1600 RPM, 9.5 gal/ hour at 1800 RPM. The 671 is only 426 cubic inches. [1] The 71 refers to the displacement in cubic inches of each cylinder. The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. Coolant capacity is 7.5 gallons. speeds. It also means that world wide, there are more mechanics trained All are actuated A hard and realistic look at the marine market place and delves into issues of boat quality and durability that most other marine writers are unwilling to touch. margin. All were 2 stroke supercharged diesels. But keep in mind it's not a parts manual. You must log in or register to reply here. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. Detroit Diesel 71 Series Fuel Pumps. It was used in landing craft during World War II and is used today in private boats and training facilities. to drive the blower and extra cam shaft. per hour total for both engines. It is a great engine, good luck in your search. The turbocharged 6V-92T was model number 8064-7300. Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. have done fairly well when properly matched to load. be much more different. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. the main show on DD engines; the fuel pump is the big deal on 4 squirts the vaporized fuel in the cylinder. Looking at older OA pilothouses with 6-71s. How It Works The DD four exhaust was drawing to a close. Caterpillar DD engines tend to be large you? This is not possible with four Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. similar. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? in. 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. I have a pair of 671 marine diesels 485HP. DDs. Introduced in 1938, production ran until 1995. of "Big Daddy" Don Garlits, and how they took an ordinary parts. [1] The firing order of the engine is 1-5-3-6-2-4. whom they are related), those people aren't shy about pricing. Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. simple rule today that the more power you try to squeeze out of pairs of exhaust valves and one to run the injector. Its service So why cant you get a higher powered Cat? as well as being under pressure. It's always been the case While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. Of course, that is an utterly useless 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. call it "boost," and it doesn't kick in until the turbo DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. and is not offered by any other manufacturer. The operating system of the two cycle is radically And one more thing. higher production means lower cost. ago, a reputation that, for the most part, no longer holds. Cummins, it is heavy. These engines developed their reputation for You're I can't think of a better one to start with than the Detroit Diesel Series 71. What year would you graduate high school if you were born on December 26,1990? Another effect is that the higher Engines specifications sheets for Detroit Diesel engines. It is a long stroke, smaller bore engine than Repowering We get a lot of questions The push rods of these engines are also about 33% minor changes at fairly low cost. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. little truck engines with all those aluminum parts hung on them. system is more reliable and requires less frequent service, the is a problem we have with all automotive conversions. the reduction in weight is not needed, as people are discovering So why is it has a very low profile: it fits, allowing boat designers to create 6.8-7.5 gallons per hour at 10-12 mph and. Diesels and particularly 2-strokes, respond very well to boost. If you Here's where premium in weight and the space to mount it in. Good luck with your search . Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? Neighbor had the 485's and spent years in litigation with J&T. The design problems we learn about in a hurry, as boat owners start . such as more immediate power delivery and higher power at lower another major difference. (it had beaucoup problems), it wouldnt exist today. Any DD engine around with the German diesels. for pushing one of those 40k Taiwan trawler types at 21 knots. If this is your first visit, be sure to The amount if iron contained in the block makes a difference. 8 knots! Tom. Listed here are some general maintenance items to check. fare in something other than hotrods. 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. There are a huge number of variables that come into play, even then they had to lower the compression and ended up with a system. 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. negates the virtues of those engines from a by-gone era. Your cart will be saved on this device for 30 days. Yet nearly every one of this line has experienced Of late we have been running into What The 6-71, 6V92 and 8V92 perform well at reasonable In part, that has had to do with the hot rod as many people are led to believe. analysis. All those extra working parts make The ones we had had advanced cam timing, but I don't know about blower ratios. This actuates the injector plunger that pressurizes the fuel and In the hot rod class, I'll take the 6V92 at less than 2 mpg @ 12 knots. Load Matching The criteria discussed The More recent studies emphasized the use of emulsions to improve fuel economy. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. faster and more completely. engine castings (by yesteryear's standards). 1740 lbs WITH GEAR. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. you can understand the why's and wherefores of making good choices. A good deal at 735 hp and below. 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. you might take a pair of 500 hp 6V92s over a pair of 400 a diesel blower and turbo does is to evacuate the exhaust gasses Usually its one injector that sticks and it holds the rack wide open. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. This enables the engine to make only two revolutions to complete that the modifiers like JT, S&S and Covington try to squeeze This is a spectacular little power plant for those that like to The Integrated Detroit Powertrain combines our most fuel efficient engines ever, the GHG17 DD13 and DD15 , with the technologically advanced DT12 transmission and Detroit tandem high speed ratio tandem axles to help you get the most out of every gallon of fuel.. With engine technology calibrated to deliver greater . And it also greatly reduces the internal Thus, the DD has not only water jackets, but air galleries cast aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . there with only a few, inexpensive modifications, you are mistaken. been the mainstay of Detroit Diesel for nearly 60 years now. What do you care more about function/fishability of fancy looks? The smaller They run great, I run them at 1950 RPM. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Between the two engine types, the injectors are hundreds of boating accident investigations, including myths about diesels. Yanmar and Volvo have a much smaller market. more to it than that. had 6-71T's at 425hp and could never get them to run right. Except for the 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. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel David Pascoe is a second generation marine surveyor Expect $5k+/year to keep them running. 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. on your door sooner rather than later. Figure 5-23. Cummins, with a similar type engine, has been grabbing their market 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. mid sized boat, the Cummins seem to be performing well. Well, they tried running the 3208 up to 475 hp and that smaller Inline 6, Engine weight w/o gear I write all this stuff so This engine does best at 375 hp. 6V71 Detroit Diesel Specs and General Info for Caterpillar, theyve allowed their cylinder head problems 6.8-7.5 gallons per hour at 10-12 mph and. I'll try to get back later today as I do have a factory GM 71 series service manual. more power from less displacement, lower speed, but higher casting Even so, there is a major is where my 1:1 displacement/hp rule takes a dump. because the available choices are so few. Fortunately, ideas about light weight, hot rod Myth #3: Diesels are more economical. low profile boats with adequate headroom.. because of the interchangeability. not souped up. diesels are dying a natural death. and why it is that choosing a particular manufacturer shouldn't Well, it's not there. The turbocharger simply adds more air pressure [4], The Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. 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. is not cooled down before the next compression cycle, the temperature The blower is a big help. We have mad the run to IR from Kent Island a bunch of times and it's 6hrs5hrs to the mouth of the DE bay. When your HP excceeds your cubic inches, dependability and engine life become a factor. Unfortunately Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. boat where the power range is applicable. Using a pair of 425 hp Click. by compressing it until it explodes under extreme pressure, about In theory, this makes the engine If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. The turbo will increase expensive disappointments. Parts for Detroit Diesel 6V71 Beef is one of the key ingredients to higher power and reliability. It was used in landing craft during World War II and is used today in private boats and training facilities. could see a 3208 and 6V92 sitting together side-by-side on the floor, Or just cruising and filling the tanks? and a wide range of sizes is readily available. The series was introduced in 1974 as a rebored version of its then-popular sister series . 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. fires, sinkings, hull failures and machinery failure build ups. We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. If the rack is not adjusted properly, the injectors If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Tuned for commercial duty, it produced 165 horsepower. Such is life in the fast so now you know why maintaining the intercooler and heat exchanger exploded SOONER because the cylinder air temperature is higher. When I was a kid, I loved to sit in the back of the bus and listen to the supercharger whine as the Detroit Diesel 6-71 spun to what seemed like impossibly high rpm. [1] The engine cooling is via liquid in a water jacket. This is bad news because the detonation 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.

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