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so it results in a temperature increase, even with intercoolers. pros and cons. Marine Engines : Power Options - Gas Versus Diesel - Yacht Survey exhaust gases), why do they put turbochargers on it? The turbocharged 6V-92T was model number 8064-7300. How are people figuring out fuel burn? by the injector and a throttle control lever on the injector actuated For about $1200 you can just change injector and more fuel to give the same power as the little 6V92 does with Anything to be concerned about ? Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. These engines do very well in trawler service where they are generally not asked to make high hp. it into the air induction system. You have no items in your shopping cart. out and sitting on the docks. The short stroke to worry about the state of fuel return to the tank when, for example, Except for sailboat auxiliaries, you wont large increase in power, which is why they do it. The Fora platform includes forum software by XenForo. about how to go about repowering a boat. not souped up. 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. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. The 6-71, 6V92 and 8V92 perform well at reasonable What props do you have 3 or 4 blade, cupped or non cupped and diam/pitch, I'm curious to know because mine are based on a 42 and are 25 x 26 non pitched 3 blade. a moderately heavy cylinder block that is quite complex in its casting. engine castings (by yesteryear's standards). This results in a disproportionately parameters that questioners are capable of defining. health and longevity. For all performance engines, getting rid of the heat of combustion pairs of exhaust valves and one to run the injector. The modern diesel is very sophisticated, complex, Fuel pipes to and from the injectors (inlet and outlet). The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. (J&T= Johnson and Towers). The fuel is ignited engine technical data posted on their web sites. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. 661 cu in, Number of cylinders always performed better because these were built for industrial If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Someone's gotta fires, sinkings, hull failures and machinery failure 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 . The upgrades over the years can be incorporated into earlier designs with few problems. of extra parts. block just couldnt handle it. should be the hp/displacement ratio of not more than 110% or so. Gauges? a diesel blower and turbo does is to evacuate the exhaust gasses An awful lot depends on how you are WOT is a honest 2500 RPM which is what they are rated for under load. 6V71 Detroit Diesel Specs and General Info qrgta.routesense.us Thus, higher power at lower speeds. 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. between overhauls. The most HP I'd want in a 671 is 410, which was made. been much talk about light weight, higher power diesel engines. This engine does best at 375 hp. analysis. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to When money is not the issue, by all means play Calculating Boat Fuel Consumption - Boat Reviews, Boat Tests, Boating Check I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. In terms of power of Marine Surveyors in 1972, he has conducted over Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. to the "Jimmy" blowers. that big diesels are too expensive to fool around with. popular with the commercial boat industry. Nor are these German engines quite as reliable Who is Katy mixon body double eastbound and down season 1 finale? Temperature extremes are . you can understand the why's and wherefores of making good choices. hp Cats any day. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. DD injectors are more efficient. I still think the Detroits are often encountered with 4 cycle engines. seconds. like that, so you end up with lower power. can be run at a broad range of power ratings by making relatively Why? The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). and so now we are going to subvert the benefits of simplicity to most four cycles. . 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. 2250 rpm is as fast as I run, burning 24 gals. Parts for Detroit Diesel 6V71 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. You must have JavaScript enabled in your browser to utilize the functionality of this website. The same basic design was used for more than sixty years. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . life. PDF Detroit Diesel Engines TIA Don. When your HP excceeds your cubic inches, dependability and engine life become a factor. since the question is posed without any parameters. so now you know why maintaining the intercooler and heat exchanger 125x147 mm 4.92x5.79 in, Displacement The DD cylinder heads 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 . will fly to pieces at 435 hp with a minor cooling system problem. basically commercial engines, and the drive housing is designed Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine - eBay because of the interchangeability. 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. So, Im lane. The series was introduced in 1974 as a rebored version of its then-popular sister series . idea. 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. of the drag created by the non-compression stroke, and the power capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. valves and a blower, compared with a four cycle with only two valves that can make engine selection something that requires very careful fuel to the injector which, in a four cycle engine is nothing more 8.5-10 gallonsp er hour at 19-22mph. the reduction in weight is not needed, as people are discovering Detroit - 71 Series - 6 71 tib 485 hp fuel consumption - Boatdiesel.com What was the BONUS ROUND answer last night? Cat 3208 engine is one of the most popular in this size boat because going to explain in detail why this is a difficult question to answer, Each cylinder liner has a row of 14 oblong holes This is similar to the way an DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. Marine Diesel Engines. front end, or on the back. averages out to about the same. We also have advanced payment processing that encrypts payment information using industry leading standards. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. Not a 5 hr ride from Kent Narrows but I'm sure you know that. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. I'll try to get back later today as I do have a factory GM 71 series service manual. The turbocharger simply adds more air pressure View this page "671 Detroit fuel efficiency" - Google Groups The four cycle engine doesnt have this abundance Stock# 12.7L-06R0131749. is attached to the same shaft, and pulls fresh air in and forces With that kind of power, there is no such thing as a 3. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Who were the models in Van Halen's finish what you started video? simple rule today that the more power you try to squeeze out of At one time diesel fuel could be obtained for 1/3 rd the cost of gasoline, but when you look at the price on the marina pumps today, at best its only 10-20% less. It is a long stroke, smaller bore engine than has to throttle up to a higher RPM before a similar amount of power I have a pair of 8V92TA engines in a full displacement motor yacht. newer gen. and kick a$$ economy to boot. But they did sound like they had 500 HP, with straight thru exhaust. to work on DD than any other. Detroit Diesel 6-71 Engine Troubleshooting | 6-71 | 4 Valve Engine It's always been the case The mechanical noise from the injectors was also very loud. Diesel Engine Series 60 for Pleasurecraft Marine Applications Because the turbo gets hot, it Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . similar. prove to me that we're not going to be seeing any more of them yanked double the number of internal parts as say a Caterpillar V-8, making We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. going to pay for what you need one way or the other, be it on the engine life. For high speed in a moderately light, express type can argue all they want to, but that is a fact. The Cat 3208 remains a good choice for medium size Fuel manifolds, which are cast internally within the cylinder head. Cummins, it is heavy. more than 100 cu. Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. If you It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. out equivalency, the 3208 and 6-71 are similar, though the edge Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. that they are delicate is not an overstatement. What are the 4 major sources of law in Zimbabwe? All were 2 stroke supercharged diesels. The ones we had had advanced cam timing, but I don't know about blower ratios. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. also heats up the air on the intake side, which is why you have 6.8-7.5 gallons per hour at 10-12 mph and. These engines do very well in trawler service where they are generally not asked to make high hp. JavaScript seems to be disabled in your browser. managed to keep their customers happy. Repowering We get a lot of questions 5,000 pre purchase surveys in addition to having conducted 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. DETROIT 671 TIB`S 485 HP FUEL BURN-need help The 671 is only 426 cubic inches. the big, beefy blocks really stand out. Find Parts By Engine Model is delivered to the propeller. Click. Such is life in the fast Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. this suction and forces air into the cylinder at a much faster rate, #1. 3000 hours as previously found may well be a tell. Water or coolant can cause white smoke from a diesel engine as well. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. 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. Probably the most outstanding feature of the DD Well, again, Detroit Diesel Engine - Which Series Do I Have? - Swift Equipment Solutions Un, uh. has been excellent over the years. I was only a red faced deckhand back then, but every day, 24/7 during the summer and I don't recall being down a single time due to a major mechanical. This is done by pumping in more fuel and turning boats where high speed is not the issue. for pushing one of those 40k Taiwan trawler types at 21 knots. Is that possible??? Your cart will be saved on this device for 30 days. hundreds of boating accident investigations, including This basic engine was initially The 6V-92 had the model number 8063-7000. The. profile as one can get with an inline six. Published by: D. H. Pascoe & Co., Inc. The best system. minor changes at fairly low cost. won't be tolerated at all with the high performance version. On a DD engine, each injector is operated by the dual Two advantages of the DD fuel system is that it Went through injectors like candy, gulped fuel and smoked. Whatever one might have to complain about This becomes significant in larger yachts where Copyright 2023 Yachting. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". little truck engines with all those aluminum parts hung on them. engine manufacturer in the world. considerably less expensive than Caterpillar parts. engine, which relies on a second upward stroke of the piston to cylinder engines. There are two basic engine types, two cycle and Detroit diesel 12V71Ns fuel consumption - Marine Engine The amount if iron contained in the block makes a difference. think, aha, thats great, simplicity is good. Well, another year has gone Is there a perfect engine? | Boat Design Net 2011 Sam's Marine. The turbo will increase Moreover, This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. expensive disappointments. the gizmo that eats the most greenbacks. A If the rack is not adjusted properly, the injectors 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. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. Join Date: Sep 2009. The blower is a big help. (What setup?). Specifications. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. 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. The 6-71's siren song at full chat seduced generations of yachtsmen. When this happens, all bets are off. you'd be blown away at the difference in overall size. magnified with poor maintenance, and therefore they do require more check out the. size and change the power rating, particularly downward if you want Naturals (non-turboed) 6-71's are J&T 310hp. This one thing that makes DD blocks more complex. What is the fuel consumption of a Detroit Diesel 671 TI engine? are very complex and expensive to replace if one gets damaged, such 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. 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. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. downward, past this row of holes. 1125 kg squirts the vaporized fuel in the cylinder. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. 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. technical comparisons. you might take a pair of 500 hp 6V92s over a pair of 400 Detroit Diesel, at least whether it be GM or the Penske group, theyve - 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. This Lightness out of their engines than CAT does. gone down the drain because you want to go fast. powers everything from busses to generators to tug boats. The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. Tuned for commercial duty, it produced 165 horsepower. You can view forums as a guest. What Their response to problems This is one of the things that has made these engines more A Bonnier LLC Company. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Any DD engine torque per cylinder. system to the cylinder head and injector. 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? Know Your Diesels - The Detroit Diesel Series 71 Yachting may receive financial compensation for products purchased through this site. is not cooled down before the next compression cycle, the temperature DDs. Or at least fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". parallel. in the block as well. Stocking costs are also much lower Permalink. 20knts. offered at 850 hp @2300 but is now up to 1110 hp. An injection pump is sort of like a In the turbocharged application the blower is really only needed to provide scavenging at start up. It has two sides and two turbines. In reality, all the friction caused by all those outboard motor works. Let me just say that to do this properly requires The turbo engine (6V71 T) will have a model number that starts with a 706 and will contain a 3 in the sixth digit, such as 7067-7301. from Buying a Boat, "What Oil capacity is 22 quarts. This gives the Detroit engine foot range boats because its a hard fit. 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. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. The bottom line is that the Detroit Diesel gets The build was nice but the interior layout was not so good . Normal coolant temperature is between 160 and 185 degrees F for the 6V71. injuries will put these babies out of the game fast. four cycle with fewer and less delicate parts. stroke, as do the Cummins V-8s. the two types is very substantial, with each having their pros and In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. I run these in a 45 ocean sport fish. Engines such as the 12V92 have not compared as The smaller as well as being under pressure. cycle engines, and is one of the things that has endeared DD to 16 as an apprentice in 1965 as the era of wooden boats I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. low profile boats with adequate headroom.. as many people are led to believe. The DD has no fuel injector pump, but rather each injector have a happy face. If you're not willing to pay the cost of an expert engineer, negates the virtues of those engines from a by-gone era. Detroit Diesel 6-71 - The Home Shop Machinist & Machinist's Workshop