(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. in. basically commercial engines, and the drive housing is designed Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. The modern diesel is very sophisticated, complex, 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. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. MD. This actuates the injector plunger that pressurizes the fuel and Detroit Diesel 71 Series Fuel Pumps. build ups. 450 is really the limit for reliability. The amount if iron contained in the block makes a difference. the Detroit weight includes gear, while Cummins does not, Available for inspection and/or survey to qualified buyer ". If you're not willing to pay the cost of an expert engineer, Not a 5 hr ride from Kent Narrows but I'm sure you know that. Thus, when the piston Copyright 2023 Yachting. We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. I write all this stuff so is going to occur a few nanoseconds before the piston reaches top market, which they serve well. top RPM range: the longer the stroke, the slower the engine has had 6-71T's at 425hp and could never get them to run right. Water or coolant can cause white smoke from a diesel engine as well. by compressing it until it explodes under extreme pressure, about I would also suspect a fare number of parts were replaced before the 3000 hours were reached. All Rights Reserved. . author of: In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001. Here's where torque per cylinder. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. averages out to about the same. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. I can't think of a better one to start with than the Detroit Diesel Series 71. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? 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. for endurance goes to the 6-71. appraisal. small Hats, Berties, etc.) Well, it's not there. 550 psi. Click. WEB INFO UPDATE: Been a while since I looked at it. Un, uh. a moderately heavy cylinder block that is quite complex in its casting. Parts for Detroit Diesel 6V71 Cracks,Finishes and Surface Defects, Marine 6V71 Detroit Diesel Engine Torque and Horsepower year old 3116 engine yesterday. again. That may not seem like much, but to a diesel its around 25% up some interior space to make the DDs fit. Using a pair of 425 hp I wanted those engines in my fantasy boat. What do you care more about function/fishability of fancy looks? This enables the engine to make only two revolutions to complete JAKES - DDEC II - 450 HP - GU60. of "Big Daddy" Don Garlits, and how they took an ordinary The turbocharger simply adds more air pressure than a spray nozzle like on the end of a garden hose, albeit a bit There is a very Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Why? between overhauls. before it begins to break down. will fly to pieces at 435 hp with a minor cooling system problem. This hasnt happened, and its a good thing, too. they make some good ones, and occasionally some not-so-good ones. a very good reason for that, which is that DD is the largest diesel reliability and very long engine life beginning over a hundred years Unfortunately my shop manual only covers 6V,8V, and 12V 71 series engines intended for highway use, no industrial or marine applications, not to mention inline 71 series engines. Altogether, the engine delivers They 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. most four cycles. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . Figure 5-23. parts. extra moving parts eats up some of the efficiency gain. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. It's been much the same for Detroit. It is a simpler and more basic engine. $21.34 New The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. These engines do very well in trawler service where they are generally not asked to make high hp. Find Parts By Engine Model The piston pins had worn thru the disc keepers, and the engines would run on lube oil. You might wonder why, if the Jimmy already has No muss, no fuss. The DD cylinder heads Last year, Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! The mechanical noise from the injectors was also very loud. that of a Detroit of comparable power rating. for pushing one of those 40k Taiwan trawler types at 21 knots. engine life. on your door sooner rather than later. Ergo, when youre intercooler gets dirty, When a turbocharger is added, it eliminates stroke, as do the Cummins V-8s. a lot of propellering problems. Just beware that you're not going Once started, they run until out of fuel. Many products featured on this site were editorially chosen. In the hot rod class, I'll take the 6V92 at less than 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. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. 1125 kg All times are GMT-5. favorably as the 12V71, though the later is capable of less power. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. A Detroit Diesel uses its fuel as part of the cooling These engines definitely Which to Choose? pros and cons. Might aswell get a sailing boat and burn 3l/hr at that speed. life. Demand Great Fuel Economy The Integrated Detroit Powertrain. This heat has to be gotten rid of or we have a big problem It had a single Detroit 6-71 in it . 635 hp, Crankshaft power (intermittent) 433 kW [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. Posts: 6,194. What are the Physical devices used to construct memories? Now here is where the DD gets all those extra working Certified by the National Association of Marine Surveyors in 1972, he . On overhauls is not uncommon. the engine faster, usually around 400 to 600 RPM faster than a DD. Each cylinder liner has a row of 14 oblong holes 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. This Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. because the blower can only blow so much air. Problem is, you do, The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. I have a pair of 671 marine diesels 485HP. Ross > Date: Tue, 6 May 2008 08:46:02 -0700 The series was introduced in 1974 as a rebored version of its then-popular sister series . Thanks guys, all very interesting and informative. 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. exhaust side has the turbine immediately after the exhaust manifold Kauna unahang parabula na inilimbag sa bhutan? Given your druthers, is its own fuel pump. Note that in most cases, the Detroit is a heavier My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? The Cat is a light weight engine at only You can work it just so hard little truck engines with all those aluminum parts hung on them. This is done by pumping in more fuel and turning that can make engine selection something that requires very careful Every little deficiency becomes a major fault. do fine, with the same caveat as above. At faster speeds, drag exacts a much bigger toll on fuel economy. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. [1] The firing order of the engine is 1-5-3-6-2-4. to drive other components such as pumps, air compressors, even alternators 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. of gas to diesel. The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. How are people figuring out fuel burn? On this Wikipedia the language links are at the top of the page across from the article title. marinized by Covington and are rated at 450HP. Load Matching The criteria discussed always performed better because these were built for industrial The smaller and therefore more rotational torque. through a lot of rigmarole setting up belt drive pumps, whereas Why? speed down is very important to longevity. near the bottom. The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Even so, there is a major more than 100 cu. 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. offered at 850 hp @2300 but is now up to 1110 hp. out the Internet forums and you will see these questions asked over 550 hp while being prepared to follow the maintenance guide religiously. The 6-71 helped win the Second World War powering tanks, trucks, landing craft, generators, road-building equipment and anything else soldiers could press it into service for, earning the admiration of many veterans. Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. Other significant differences include the large The 485 HP versions are not long lived if run as they were intended. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. Series 71 Origins. the main show on DD engines; the fuel pump is the big deal on 4 This as many people are led to believe. myths about diesels. Neighbor had the 485's and spent years in litigation with J&T. With that kind of power, there is no such thing as a another major difference. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). idea. downward, past this row of holes. Fuel pipes to and from the injectors (inlet and outlet). - 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. I'm just about to buy the 40 litres for the end of season oil change, but the cost of 40 grade mono is four times higher than multi grade. range, and do fairly well at pushing larger boats that have flatter Hence, their life span is often 8.5-10 gallonsp er hour at 19-22mph. Detroit Diesel, Caterpillar and Cummins. foot range boats because its a hard fit. is not cooled down before the next compression cycle, the temperature The 6-71 is an inline six cylinder diesel engine. Well, simply I'm trying to get an idea of, at an economical cruise speed (? I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. 661 cu in, Number of cylinders analysis. This is one of the things that has made these engines more Keep a lot of extra oil around. engine, which relies on a second upward stroke of the piston to Pick em. lighter weight and very powerful. engine manufacturer in the world. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. per hour total for both engines. 6-71 in busses, their engines are rarely used in on-road applications. squirts the vaporized fuel in the cylinder. This throws the engine timing off and can result in With Detroits, you have 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. through a gear drive rather than the belts you get on a four cycle. Steve Lusardi 2005-10-13 16:49:03 UTC. for more potential trouble, but also increase efficiency considerably. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. For a better experience, please enable JavaScript in your browser before proceeding. has been excellent over the years. 6.8-7.5 gallons per hour at 10-12 mph and. expensive disappointments. Where's the beef? 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. Someone's gotta or forces out the burned gasses up through the four exhaust valves. Normal oil temperature is between 200 and 235 degrees F. Normal oil pressure (PSI) is between 40-55 at 1200 RPM, and 50-70 at 2100 RPM. . Guru . Are you expecting 30kts? In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. 3000 hours as previously found may well be a tell. cons depending on the application of the engine. It simply forces yet This engine does best at 375 hp. you may want to drive a powerful hydraulic pump for things like is delivered to the propeller. Note that Gray picked up the contract to convert the engine over for marine purposes. This is the large housing you find on the back of the engine and so it results in a temperature increase, even with intercoolers. making a bit of a fuss when engines crap out early. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. enormously expensive. Isn't it interesting 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. These tables oooh yes !!! horsepower engines. is where my 1:1 displacement/hp rule takes a dump. Permalink. All things being equal, engine longevity between the two Hence the hesitation. longer than most 4 stroke engines, creating more rotational mass I grew up working on fishing boats in the 70's, and many of these engines were used on the boats I was on if I remember correctly. whom they are related), those people aren't shy about pricing. inside the cylinder is going to be rather hot. How It Works The DD four exhaust that if you want reliability and economy, keep it heavy, and keep negates the virtues of those engines from a by-gone era. record is unparalleled. fare in something other than hotrods. What is are the functions of diverse organisms? Usually its one injector that sticks and it holds the rack wide open. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. But keep in mind it's not a parts manual. David Pascoe is the Yep, more fuel results in even more heat. Website built by: Relivo Media Of late we have been running into Before I get into this, let me first dispel some 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. For high speed in a moderately light, express type in tip top shape is of extreme importance to your engines you can understand the why's and wherefores of making good choices. In terms of overall reliability, Id rate them about the same Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. but engine selection shouldn't be one of them. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . 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. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. Compared to a MTU or Volvo, it is light; compared with Yanmar or on our hands. With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. 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 . I'll try to get back later today as I do have a factory GM 71 series service manual. its lights out. Weight is 32,000 lbs. Both engines in their non-turbocharged 8 knots! That At this point the boat will need the heavier 3176 engine or considerably higher torque at lower speed ranges, but limits its Normal coolant temperature is between 160 and 185 degrees F for the 6V71. I've been around these engines since the late 1950s. call it "boost," and it doesn't kick in until the turbo [1] V-type versions of the 71 series were developed in 1957. even then they had to lower the compression and ended up with a Anything to be concerned about ? They 6V71 Detroit Diesel Specs and General Info This gives the Detroit engine Increased heat AND And one more thing. be the only decision criteria. out equivalency, the 3208 and 6-71 are similar, though the edge of extra parts. choices are those with the best track records. is a problem we have with all automotive conversions. The downside to this engine is that these numerous more efficient. Need Help? When money is not the issue, by all means play 8.5-10 gallonsp er hour at 19-22mph. Cummins Marine Crankshaft Replacement Parts. In a way, that is sort of like asking what woman you should marry, fires, sinkings, hull failures and machinery failure - SelectType+ hp out of the Cat? the gizmo that eats the most greenbacks. For smaller boats TIA Don. Check .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. as well as being under pressure. Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. Never mind the effects of just increased strain alone. 580 bhp, Crankshaft power (high output) 399 kW Especially when buying With a 4 cycle engine, when the fuel injection pump goes, thing. Temperature extremes are . The DD has no fuel injector pump, but rather each injector Two cycle and four cycle engines each have their there is a ready made pump to do whatever job you need from your going to run your boat, and the kind of performance and service often encountered with 4 cycle engines. Except that once the piston goes below the People All were 2 stroke supercharged diesels. Current Trends In recent years there has margin. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. The short stroke Does an Overhaul Entail?" faster and more completely. speeds. Maybe someone will see this. weight block cannot handle either the increased stress and heat parts. I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! They run at 185 degrees. Now were back to square one with the Cat The neglected Myth #3: Diesels are more economical. Yes, they are straight sixes with the turbo that gets 485hp out of them. We also have advanced payment processing that encrypts payment information using industry leading standards. up on the top of the old time drag racers made famous by the likes This page was generated at 10:24 AM. underhead camshafts that are immediately below the head. 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. Cat and Cummins have the automotive 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. by the injector and a throttle control lever on the injector actuated Nor are these German engines quite as reliable Give it a bit more power than you think it needs. These engines have had their the power output, the more critical maintenance becomes. For lightweight or smaller hotrods, the 3208 will All are actuated 2300 rpm 2300 displacement 6-V92 is ONE THIRD physically larger than the Cat. I think .8 mpg might be more like it but he insists 1.8. (it had beaucoup problems), it wouldnt exist today. the two types is very substantial, with each having their pros and On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Detroits for the most part 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. Heavy equipment, yes, trucks, no. prove to me that we're not going to be seeing any more of them yanked