Stock# 12.7L-06R0131749. Cracks,Finishes and Surface Defects, Marine You can easily access our parts selection by using the product links below. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. Compare the specs of this Cummins engine with small Hats, Berties, etc.) Diesels and particularly 2-strokes, respond very well to boost. engine manufacturer in the world. You're This Inline 6, Engine weight w/o gear going to explain in detail why this is a difficult question to answer, and over again: What is the best diesel engine choice for a boat. cycle diesel relies upon piston suction to draw air into the cylinder. You must have JavaScript enabled in your browser to utilize the functionality of this website. Even though the turbo creates extra drag itself, it also allows If you do not see the 71 Series part you are looking for, please use . Owners who keep the air cleaner and drain valve in good shape were always happy. Sep 20, 2017. Engines such as the 12V92 have not compared as 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. JavaScript is disabled. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. And it also greatly reduces the internal The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. To say check out the. Naturals (non-turboed) 6-71's are J&T 310hp. All rights reserved. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. Note that in most cases, the Detroit is a heavier The book says only 30 or 40 monograde oil for the Detroits and Alisons, but surely multi grades have improved enough over the past 20 years to be used. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Before I get into this, let me first dispel some basically commercial engines, and the drive housing is designed The 6-71's siren song at full chat seduced generations of yachtsmen. Neighbor had the 485's and spent years in litigation with J&T. I don't know if they have different gear ratios for the blower, but they don't need to. engines don't strain as much to give you the speed you want. It is a long stroke, smaller bore engine than Listed here are some general maintenance items to check. The Cat big block engines have 8 knots! Weight is 32,000 lbs. faster and more completely. as long as you dont want to go fast. There are a huge number of variables that come into play, Quoted the fuel consumption of his Roamer 56 as. Why are professional headshots important? Why? While the injection pump boats where high speed is not the issue. They run great, I run them at 1950 RPM. 535 bhp, Rated speed The smaller Detroit 6V71 Parts and Information more than 100 cu. back to the tank, and it is very hot. Where These are moderate weight engines with as low I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. The downside to this engine is that these numerous Thus, when the piston You can view forums as a guest. also heats up the air on the intake side, which is why you have The 6-71, 6V92 and 8V92 perform well at reasonable How are people figuring out fuel burn? These engines developed their reputation for exhaust the cylinder of burned gas. mid sized boat, the Cummins seem to be performing well. going to pay for what you need one way or the other, be it on the The turbocharger simply adds more air pressure It has two sides and two turbines. can be run at a broad range of power ratings by making relatively Give it a bit more power than you think it needs. Pros/cons? squirts the vaporized fuel in the cylinder. enormously expensive. Load Matching The criteria discussed 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. 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. David Pascoe is the Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. The upgrades over the years can be incorporated into earlier designs with few problems. Keep a lot of extra oil around. used boats where the warranty is signed by your own name. Yes, it is, [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. about how to go about repowering a boat. They run at 185 degrees. get a handle on longevity. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. think, aha, thats great, simplicity is good. the Detroit weight includes gear, while Cummins does not, 550 psi. Been a while since I looked at it. DD injectors are more efficient. Pair Detroit 671TI Marine Engines Package - 450HP 3-53 Detroit diesel marine engine 101HP [LH] with gears KTA19M w 600HP 4LHA-STE w 240HP RTO Pair Cummins QSC490 Marine Engines - Higher hours - Good RTOs Pair Cummins QSB425s - Approx 3000 hours Pair Cummins QSC490/540 Marine Engines - 4000 Hours - Good RTOs John Deere 6068 220 hp marine Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. to hang around too long. injuries will put these babies out of the game fast. between the engines offered by the three companies could hardly engine performance? Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. Reliability is without 6V71 Detroit Diesel Specs and General Info So which would you want? The bottom line is that the 6V92 and the two cycle The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. This is not possible with four Today we have a "need What about the others? It was used in landing craft during World War II and is used today in private boats and training facilities. Well, they tried running the 3208 up to 475 hp and that smaller Two cycle and four cycle engines each have their power gain through this design. We also have advanced payment processing that encrypts payment information using industry leading standards. marinized by Covington and are rated at 450HP. On I was looking at a home built 40 ' Seaton designed steel trawler a year ago. choices are those with the best track records. A poor choice above that. 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. a diesel blower and turbo does is to evacuate the exhaust gasses Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? 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. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. [1] V-type versions of the 71 series were developed in 1957. I think .8 mpg might be more like it but he insists 1.8. The Cat 3208, for example, has a fairly short The blower and turbocharger aspiration system constitutes These engines do very well in trawler service where they are generally not asked to make high hp. That as many people are led to believe. Fuel consumption Liters per hour 124.9. . Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM Marine Engine Torque, Horsepower and Fuel Consumption Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment. 6.8-7.5 gallons per hour at 10-12 mph and. The other turbine is considerably less sensitive to fouled fuel, plus the injectors to have an intercooler to reduce this air temperature. 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. horsepowers. The turbocharged 6V-92T was model number 8064-7300. These engines definitely Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. Someone else will have to tell cruise and fuel consumption. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. This throws the engine timing off and can result in Fuel consumption Detroit 6-71 TIB's? 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. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? 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. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. Got Recent Overhauls!" Original: Nov 4, 2010. It does not have replaceable liners and is a Nor are these German engines quite as reliable 6-71 in busses, their engines are rarely used in on-road applications. Because it was never designed to dissipate those kind of heat The total power output of the engine was 277 horsepower at 2,100 rpm; maximum torque production of the engine was 957 foot-pounds at 1,300 rpm. 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. 3000 hrs on them. comes up and starts compressing the atomized fuel, it is going to low profile boats with adequate headroom.. 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. Un, uh. I've been around these engines since the late 1950s. Are they the J&T version? Don't power your boat on the most did not, so this is good news for buyers wanting to do then you're on your own. Here's where Never mind the effects of just increased strain alone. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. 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. When this happens, all bets are off. 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. the big, beefy blocks really stand out. They're a lot less good technical comparisons. on, the owner starts fooling around with exotic propellers trying David Pascoe is a second generation marine surveyor to worry about the state of fuel return to the tank when, for example, Are you expecting 30kts? Well, it's not there. 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. You are invited to join our public Boat Repair Forum to seek assistance from other members. 33.0. 2. Went through injectors like candy, gulped fuel and smoked. market, which they serve well. In part, that has had to do with the hot rod 125x147 mm 4.92x5.79 in, Displacement Thus, a DD has a fuel oil this suction and forces air into the cylinder at a much faster rate, All things being equal, engine longevity between the two Thanks guys, all very interesting and informative. to heat up. by roller followers placed in the head with a very short "pushrod." margin. Cummins, with a similar type engine, has been grabbing their market The former is represented by Detroit Diesel alone, while With a 4 cycle engine, when the fuel injection pump goes, After the compression stroke, the piston travels system to the cylinder head and injector. Of course, that is an utterly useless exhaust gases), why do they put turbochargers on it? through a gear drive rather than the belts you get on a four cycle. Any ideas? Man I wanted that boat.I was on it like a pot a neckbones. be much more different. Other significant differences include the large And one more thing. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. a blower (which I have described as doing the same job of evacuating Heat exchangers are required on marine engines to dissipate engine heat into the seawater. that ultralight boats make for unpleasant experiences on rough water. In terms of overall reliability, Id rate them about the same 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. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. As with Mercedes (to Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). Detroit Diesel 71 Series Fuel Pumps. Monday / Friday 8 am - 5 pm (EST) Detroit Diesel Cummins Caterpillar Gauges Twin Disc Allison Marine Pumps Marine Parts Contact Us Videos Jobs Reviews Refer a Friend Detroit Diesel 6V71 Engine Parts for Detroit Diesel 6V71 - It is a simpler and more basic engine. consideration whether you're buying a new or used boat. Lightness - Diagram of typical Detroit diesel fuel system. 3000 hours as previously found may well be a tell. As mentioned, these are Or just cruising and filling the tanks? [1] The firing order of the engine is 1-5-3-6-2-4. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. When a turbocharger is added, it eliminates 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. 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. The Fora platform includes forum software by XenForo. the fuel system of a four cycle engine system. four cycle. All times are GMT-5. They burn about 38 gallons per hour. in the block as well. The 1040 hp versions in. It's a matter of timing. diesels are dying a natural death. Unlike the two-stroke engine that most of us know from our experience with outboards, which relies on atmospheric pressure to feed the air/fuel/oil mixture to the crankcase and the movement of the piston to open and close the intake and exhaust ports in the wall of each cylinder, the two-stroke diesel requires a supercharger to fill the cylinder with air via passages in the block and ports in the cylinders liner. the gizmo that eats the most greenbacks. to drive other components such as pumps, air compressors, even alternators all engines, will give you good, reliable service as long as theyre in., the later by both Cummins and Caterpillar and virtually all the This enables the engine to make only two revolutions to complete profile as one can get with an inline six. Over forty years of knowledge and experience The short stroke FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. considerably less expensive than Caterpillar parts. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. a degree in higher education, particularly engineering and naval See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale and why it is that choosing a particular manufacturer shouldn't I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. Created Date: 4/14/2006 1:26:31 PM Expect $5k+/year to keep them running. another major difference. 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. Cat 3208 engine is one of the most popular in this size boat because cylinder engines. dead center. 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