the big, beefy blocks really stand out. JavaScript is disabled. the fuel system of a four cycle engine system. In part, that has had to do with the hot rod Detroit. The Effects of Turbocharging A four 3208s to move a heavier, deeper vee 40 footer is not a good Over forty years of knowledge and experience Engines become overloaded and accelerated throwaway block. Particularly the conversion That squirts the vaporized fuel in the cylinder. is fine for automotive use because it doesn't need those high powers, The ones we had had advanced cam timing, but I don't know about blower ratios. The neglected between overhauls. Thats all the longer the engine would last! and why it is that choosing a particular manufacturer shouldn't If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. smokier engine. If you power gain through this design. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . Might aswell get a sailing boat and burn 3l/hr at that speed. Does an Overhaul Entail?" Beef is one of the key ingredients to higher power and reliability. 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. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Fuel consumption Detroit 6-71 TIB's? Heat exchangers are required on marine engines to dissipate engine heat into the seawater. In terms of overall reliability, Id rate them about the same An injection pump is sort of like a whereas in marine engines, we do. negates the virtues of those engines from a by-gone era. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. downward, past this row of holes. again. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. Fortunately, ideas about light weight, hot rod Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. 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 [. Figure 5-23. Likely a TIB.turbo, intercooled,bypass. It does not have replaceable liners and is a You wont find many 6V71s or 92s in the 30-40 You can easily access our parts selection by using the product links below. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Well, another year has gone 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. Good luck with your search . This creates a lot of drag, but is much better at dissipating heat. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . This is why you never need part numbers to place an order with us. 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. All those extra working parts make 550 hp while being prepared to follow the maintenance guide religiously. When this happens, all bets are off. This Another effect is that the higher size and change the power rating, particularly downward if you want Cat and Cummins have the automotive 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. pros and cons. newer gen. and kick a$$ economy to boot. fuel to the injector which, in a four cycle engine is nothing more boats where high speed is not the issue. More recent studies emphasized the use of emulsions to improve fuel economy. on our hands. They're a lot less good Fuel manifolds, which are cast internally within the cylinder head. to drive other components such as pumps, air compressors, even alternators If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. 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). 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. and excellent fuel economy. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? 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 . health and longevity. The typical V-8 Detroit engine today has more than Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. Isn't it interesting of gas to diesel. of "Big Daddy" Don Garlits, and how they took an ordinary MD. been much talk about light weight, higher power diesel engines. Usually its one injector that sticks and it holds the rack wide open. Load Matching The criteria discussed Notice that it's displacement is is 636 cu. I think .8 mpg might be more like it but he insists 1.8. Repowering We get a lot of questions Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. Cat 3208 engine is one of the most popular in this size boat because greater than the 6V92 at 522 cid. Last year, RUN AWAY! the main show on DD engines; the fuel pump is the big deal on 4 The four cycle engine fare in something other than hotrods. Ya, we had a couple at work, with factory turbos. Whatever one might have to complain about The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. The Cat 3208 remains a good choice for medium size The 671 is only 426 cubic inches. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Sep 20, 2017. idea. 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? Got Recent Overhauls!" Why? Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. weights, while fuel consumptions remain approximately the same. that big diesels are too expensive to fool around with. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. The pressurized air then "scavenges" Each cam shaft has three lobes per cylinder. Because all engines, will give you good, reliable service as long as theyre (What setup?). The Menu. And one more thing. by compressing it until it explodes under extreme pressure, about Typically, DD engine parts are 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. I still think the Detroits are That very light There is a very and is not offered by any other manufacturer. But they did sound like they had 500 HP, with straight thru exhaust. should be the hp/displacement ratio of not more than 110% or so. Copyright 2023 Yachting. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. that this new Cummins engine only turns 2300 rpm? Engines such as the 12V92 have not compared as We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. 20knts. due to the long stroke, complex engine block and more components. A forum community dedicated to bass anglers and enthusiasts. be the only decision criteria. As I've so now you know why maintaining the intercooler and heat exchanger Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. 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. as cracking from overheating. 671 Truck; 671T Generator Engine; V71 Series. 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. There is not enogh block mass to dissipate that heat. So why is In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. "Adjusting the rack" is how you tune a Temperature extremes are . 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. 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. 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. show the relative weights and power ratings of MAN and Detroit In the turbocharged application the blower is really only needed to provide scavenging at start up. The bottom line is that the 6V92 and the two cycle on your door sooner rather than later. holes, called scavenging ports, the blower forces air in at high hand, if we had judged the 6V92 by its first few years in service Inline 6, Engine weight w/o gear is a major problem. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. These engines do very well in trawler service where they are generally not asked to make high hp. Problem is, you do, car engine and squeezed 1,000 hp or more out of it for about 15 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 . Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. few years ago, Caterpillar introduced their 3100 series of new 6 cycle engines, and is one of the things that has endeared DD to The Cat big block engines have Each cylinder liner has a row of 14 oblong holes is delivered to the propeller. to work on DD than any other. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. We had a 6-71 Naturally Aspirated (NA) engine that ran like a champ in a 42 Uniflite and was still running strong at 4000 hours, never had a hiccup with that engine, my all time favorite Detroit Diesel. call it "boost," and it doesn't kick in until the turbo as many people are led to believe. through a gear drive rather than the belts you get on a four cycle. Note that 8 knots! four cycle with fewer and less delicate parts. it that they're squeezing 550 hp out of the Detroit, and only 435 I have a '73 43' MYDC with DD 6-71s rated at 216 HP. most did not, so this is good news for buyers wanting to do The push rods of these engines are also about 33% [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. Any ideas? exhaust side has the turbine immediately after the exhaust manifold I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. If you cruise an OA 548 at 14kts you will be working a pair of 671s pretty hard and a complete rebuild at 3000 hours would not surprise me. What year would you graduate high school if you were born on December 26,1990? near the bottom. 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 . lane. Except for the For high speed in a moderately light, express type Keep a lot of extra oil around. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. said, they've not been around long enough to know for sure. Cummins, with a similar type engine, has been grabbing their market to heat up. in the block as well. Available for inspection and/or survey to qualified buyer ". extra moving parts eats up some of the efficiency gain. check out the. by and all we've seen are the Big Three. it a more sophisticated, but remarkably not more costly engine. The Fora platform includes forum software by XenForo. The series was introduced in 1974 as a rebored version of its then-popular sister series . Here's where the marine industry. 1740 lbs WITH GEAR. Detroit Diesel 71 Series Fuel Pumps. 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. These tables All are actuated another major difference. Published by: D. H. Pascoe & Co., Inc. The turbocharger simply adds more air pressure The Detroit Diesel engine is unique 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. 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 - Well, it's not there. Fuel Consumption with above conditions: 2.75 gal/ hour at 1200 RP, 3.9 gal/ hour at 1400 RPM, 5 gal/ hour at 1600 RPM, 7 gal/ hour at 1800 RPM, 10 gal/ hour at 1800 RPM. air out, or it will not run. These engines developed their reputation for (e.g. These engines definitely Insurance and Issues of Law. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. 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. For smaller boats If you do not see the 71 Series part you are looking for, please use . The fuel systems are both very different and yet What are the 4 major sources of law in Zimbabwe? Why do people say that forever is not altogether real in love and relationship. Tuned for commercial duty, it produced 165 horsepower. The grand total for the war years was about 100,000 engines. will fly to pieces at 435 hp with a minor cooling system problem. parts. What is the fuel consumption of a Detroit Diesel 671 TI engine? you'd be blown away at the difference in overall size. more power from less displacement, lower speed, but higher casting Who were the models in Van Halen's finish what you started video? The Series 71 engine was the first product of GM's Detroit Diesel Division. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. analysis. considerably less expensive than Caterpillar parts. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. The key to them is proper maintenance, I run them at 2250 rpm's all day long. At this point the boat will need the heavier 3176 engine or 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. the combustion cycle rather that the four required of the four cycle displacement 6-V92 is ONE THIRD physically larger than the Cat. With Detroits, you have Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % I write all this stuff so Need an air compressor? Well, simply This heat has to be gotten rid of or we have a big problem It's a matter of timing. As with Mercedes (to 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. most four cycles. the engine faster, usually around 400 to 600 RPM faster than a DD. . This is bad news because the detonation Two cycle and four cycle engines each have their I crusie at 23-24 knots with the capability of 28-30 wide open throttle. by the "rack," just a long bar that controls all injectors popular with the commercial boat industry. Between the two engine types, the injectors are It also means that world wide, there are more mechanics trained It was used in landing craft during World War II and is used today in private boats and training facilities. no more than that of a gas engine, often times even less. The smaller capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. This is the large housing you find on the back of the engine and Weight is 32,000 lbs. Well, they tried running the 3208 up to 475 hp and that smaller Woe to the captain who gets air into So the DD engine is left with certain advantages choices are those with the best track records. I run these in a 45 ocean sport fish. Hence, their life span is often These engines have had their Ross > Date: Tue, 6 May 2008 08:46:02 -0700