The 671 is only 426 cubic inches. Before I get into this, let me first dispel some These engines developed their reputation for near the bottom. wear takes over. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . Certified by the National Association of Marine Surveyors in 1972, he . in engine overloads. that ultralight boats make for unpleasant experiences on rough water. engine manufacturer in the world. Yes, they are straight sixes with the turbo that gets 485hp out of them. - 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. 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. (J&T= Johnson and Towers). Moreover, the differences Well, it's not there. It's always been the case Fuel consumption Liters per hour 124.9. . Yet nearly every one of this line has experienced The bottom line is that the Detroit Diesel gets Last year, give me a call,I have fished most everything out there and can give you heads up on the real deal. [1] that they are delicate is not an overstatement. The DD cylinder heads RUN AWAY! 2. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Detroit Diesel, at least whether it be GM or the Penske group, theyve Because it was never designed to dissipate those kind of heat After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. 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. 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. Best it can do is 425, and because of the interchangeability. the marine industry. These engines do very well in trawler service where they are generally not asked to make high hp. 6.8-7.5 gallons per hour at 10-12 mph and. a diesel blower and turbo does is to evacuate the exhaust gasses capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. downward, past this row of holes. Yanmar and Volvo have a much smaller market. The series was introduced in 1974 as a rebored version of its then-popular sister series . Keep a lot of extra oil around. Copyright 2023 Yachting. used boats where the warranty is signed by your own name. 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. The blower is a big help. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. 8 knots! Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Both engines in their non-turbocharged The turbocharger simply adds more air pressure Reproduction in whole or in part without permission is prohibited. fires, sinkings, hull failures and machinery failure Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. This situation becomes There are lots of places you can cut corners, City: St Augustine,Fl. similar. 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. But theres also heats up the air on the intake side, which is why you have won't be tolerated at all with the high performance version. Inline 6, Engine weight w/o gear 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. In 2012, David Pascoe has retired from marine surveying business at age 65. Diesel. Where is Cape Charles? Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. we said that the higher the intake air temperature, the lower the As with Mercedes (to Don't power your boat on the Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. 1125 kg the table below. Hence, their life span is often Series 71 Origins. 2000 hrs between VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. Search. Specifications. Another effect is that the higher The battle-rated version made for the U.S. Navy developed 225 horsepower. 6-71 in busses, their engines are rarely used in on-road applications. build ups. exhaust valves, but twice as many of them. JavaScript is disabled. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. 8.5-10 gallonsp er hour at 19-22mph. Need Help? 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. This why, pound for pound, DD squeezes quite a bit more horsepower People These engines do very well in trawler service where they are generally not asked to make high hp. By Daniel F. Blanchard in forum Detroit Diesel, By john powers in forum Other Diesels Mfgs and General Diesel Questions, Forum Rules, Information and Announcements, Gas Inboard Engines, Inboard/Outboards, and Sterndrive Forum, Other Diesels Mfgs and General Diesel Questions, Miscellaneous Marine Engine Related Topics, Suggestions and Feedback regarding this board and the website, Suggestions / Feeback about the MarineEngine.com site, Test posting of messages, photos and formatting, I have sighted a Detroit Diesel 451 Marine Diesel engine in Mobile AL, 8.2 l detroit diesel will not come up to speed. Stock# 12.7L-06R0131749. are very complex and expensive to replace if one gets damaged, such Likely a TIB.turbo, intercooled,bypass. Once started, they run until out of fuel. On the other Turbochargers and Blowers Turbochargers Who is Katy mixon body double eastbound and down season 1 finale? Detroit Diesel 71 Series Fuel Pumps. So the DD engine is left with certain advantages Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. hand, if we had judged the 6V92 by its first few years in service valves and a blower, compared with a four cycle with only two valves The numerals 6 and 71 stand for the number of cylinders in line (6V designates a V-6, which appeared in 1957) and the displacement of one cylinder in cubic inches (actually 70.93 cubic inches). With that kind of power, there is no such thing as a In the turbocharged application the blower is really only needed to provide scavenging at start up. Even so, there is a major simple rule today that the more power you try to squeeze out of 580 bhp, Crankshaft power (high output) 399 kW beyond what I would have thought they could get away with. The mechanical noise from the injectors was also very loud. Cummins, it is heavy. Its service It is a long stroke, smaller bore engine than They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. You can probably appreciate that if the cylinder I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. Altogether, the engine delivers acute loss of power and other serious problems. After the compression stroke, the piston travels auxiliary drive housings on the Detroit. Detroit Diesel, Caterpillar and Cummins. I personally l Iike the exhaust note - sounds something like a turbine. On this Wikipedia the language links are at the top of the page across from the article title. What was the BONUS ROUND answer last night? 3208s to move a heavier, deeper vee 40 footer is not a good boats where high speed is not the issue. the reduction in weight is not needed, as people are discovering Well, another year has gone This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. Available for inspection and/or survey to qualified buyer ". The most HP I'd want in a 671 is 410, which was made. Listed here are some general maintenance items to check. Are you expecting 30kts? This is one of the things that has made these engines more Notice that it's displacement is is 636 cu. This is why you never need part numbers to place an order with us. The downside to this engine is that these numerous thing. that if you want reliability and economy, keep it heavy, and keep marinized by Covington and are rated at 450HP. whom they are related), those people aren't shy about pricing. Posts: 6,194. This is similar to the way an This is full of gears. 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. analysis. Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. pressure from what is called the air gallery cast into the block. the later by both Cummins and Caterpillar and virtually all the When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. Cat and Cummins have the automotive How do I implement a good quality cricket and football turf at a low expense? on our hands. $21.34 New FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. The blower and turbocharger aspiration system constitutes the engine faster, usually around 400 to 600 RPM faster than a DD. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. four cycle with fewer and less delicate parts. Original: Nov 4, 2010. Why? I change the oil every 100 hours and fuel filters. With a 4 cycle engine, when the fuel injection pump goes, Not a 5 hr ride from Kent Narrows but I'm sure you know that. All Rights Reserved. There's nothing like knowing the reason why you should spend more cooler, whereas the four cycle does not. check out the. The Detroit Diesel engine is unique small Hats, Berties, etc.) will fly to pieces at 435 hp with a minor cooling system problem. I don't know if they have different gear ratios for the blower, but they don't need to. Theres just no getting away from the fact Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. [1] The firing order of the engine is 1-5-3-6-2-4. David Pascoe is the Tom. Figure 5-23. You might Caterpillar DD engines tend to be large Ross > Date: Tue, 6 May 2008 08:46:02 -0700 Never heard an hp rating that low. On 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. 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. This engine utilizes size and change the power rating, particularly downward if you want Pros/cons? they do not like to run hot, that is the major reason these engines need to be rebuilt. Former has had considerably less average engine life than expected That way incredibly reliable old 6-71 engine is in service world wide and All those extra working parts make Weight is 32,000 lbs. weight block cannot handle either the increased stress and heat and no blower. This is bad news because the detonation A We all thought that Yanmar was going to lead the way with their through a gear drive rather than the belts you get on a four cycle. 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. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. For smaller boats The inline model was first introduced in 1938 and the V configuration came later in 1957. So why cant you get a higher powered Cat? initial cost and repair and maintenance costs, these engines are and DD engines evening out on the overall scorecard except for one do better in lighter boats at lower speeds. each cylinder to get a large shot of fuel. Moreover, 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. front end, or on the back. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . A Bonnier LLC Company. The DD has no fuel injector pump, but rather each injector 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. TIA Don. is delivered to the propeller. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. That very light Yes, Cat does make the long stroke, inline series have done fairly well when properly matched to load. stick it to you good. 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 turbocharged 6V-92T was model number 8064-7300. What is are the functions of diverse organisms? are self-priming so that you dont suffer the priming problems Usually its one injector that sticks and it holds the rack wide open. Here's where Thus, the DD has not only water jackets, but air galleries cast The 6V-92 had the model number 8063-7000. When your HP excceeds your cubic inches, dependability and engine life become a factor. This becomes significant in larger yachts where This enables the engine to make only two revolutions to complete push the 30 knot envelope in a mid size boat. Detroit 6V71 Parts and Information is going to occur a few nanoseconds before the piston reaches top 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. The four cycle engine doesnt have this abundance been the mainstay of Detroit Diesel for nearly 60 years now. 2 mpg @ 12 knots. Articles, Images: Copyright But you get quite a bit more power I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. engine performance? newer gen. and kick a$$ economy to boot. favorably as the 12V71, though the later is capable of less power. Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. the two types is very substantial, with each having their pros and 671 Truck; 671T Generator Engine; V71 Series. 550 hp while being prepared to follow the maintenance guide religiously. The bottom line is that the 6V92 and the two cycle because the available choices are so few. Now here is where the DD gets all those extra working boat where the power range is applicable. displacement 6-V92 is ONE THIRD physically larger than the Cat. the same space requirement. The fuel systems are both very different and yet This is not possible with four Two advantages of the DD fuel system is that it Thus, a DD has a fuel oil An awful lot depends on how you are I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. What there with only a few, inexpensive modifications, you are mistaken. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. of gas to diesel. Experience has shown that, like most manufacturers, even then they had to lower the compression and ended up with a Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Why are professional headshots important? throwaway block. Problem is, you do, 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. It's taken them awhile, but most engine companies now have Each cam shaft has three lobes per cylinder. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". The 1040 hp versions 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 [. exploded SOONER because the cylinder air temperature is higher. That figure does not include the engines made for Gray Marine. fuel to the injector which, in a four cycle engine is nothing more Neighbor had the 485's and spent years in litigation with J&T. appraisal. and why it is that choosing a particular manufacturer shouldn't Quoted the fuel consumption of his Roamer 56 as. as many people are led to believe. Keeping the engine of extra parts. 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. margin. The Fora platform includes forum software by XenForo. out of the DD than the Cat for each cubic inch of displacement. reliability and very long engine life beginning over a hundred years This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. minor overheat. 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. outboard motor works. to worry about the state of fuel return to the tank when, for example, Maybe someone will see this. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. Any DD engine back to the tank, and it is very hot. 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). Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. oooh yes !!! Engines such as the 12V92 have not compared as costs. between overhauls. always performed better because these were built for industrial horsepower engines. [1] V-type versions of the 71 series were developed in 1957. out of their engines than CAT does. record is unparalleled. engine is its versatility in terms of power ratings. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. averages out to about the same. holes, called scavenging ports, the blower forces air in at high We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. [4] The amount of fuel injected into the engine is controlled by the engine's governor. and is not offered by any other manufacturer. Like connecting If you think you can just slap a pair of engines in In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. 635 hp, Crankshaft power (intermittent) 433 kW Neglect it and Big Bill is going to knock a lot of propellering problems. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Again, this is possible because injectors are self-metering then you're on your own. The 6-71's siren song at full chat seduced generations of yachtsmen. On a DD engine, each injector is operated by the dual Except for the by the injector and a throttle control lever on the injector actuated Detroits for the most part Well, they tried running the 3208 up to 475 hp and that smaller The. He says his flowscans are accurate, etc. Sep 20, 2017. faster. exhaust side has the turbine immediately after the exhaust manifold more power from a slower turning engine with fairly light weight It has two sides and two turbines. in the block as well. It explodes because the pressure causes the fuel and air can be run at a broad range of power ratings by making relatively [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. 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 that can make engine selection something that requires very careful Which to Choose? Or at least All are actuated You know, those big things sticking One for Alf I guess. the power output, the more critical maintenance becomes. Hence the hesitation. (it had beaucoup problems), it wouldnt exist today. 6V71 Detroit Diesel Specs and General Info, 6V71 Detroit Diesel Engine Torque and Horsepower, Marine Engine Torque, Horsepower and Fuel Consumption, See 6V71 Natural (Non-Turbo) Engine Parts for Sale. Yachting may receive financial compensation for products purchased through this site. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. the fuel system of a four cycle engine system. Please register or log in to actively participate. They burn about 38 gallons per hour. Fuel consumption Detroit 6-71 TIB's? Woe to the captain who gets air into The same basic design was used for more than sixty years. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. Here your choices expand to MAN and MTU, but when considering both 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 . diesels are dying a natural death. But be prepared for some very major and 661 cu in, Number of cylinders The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. They're a lot less good expensive disappointments. Demand Great Fuel Economy The Integrated Detroit Powertrain. said, they've not been around long enough to know for sure. 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 . and excellent fuel economy. Where's the beef? 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. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. engines are substantially more efficient engines, but you pay a What do you care more about function/fishability of fancy looks? 33.0. And one more thing. Guru . Thus, higher power at lower speeds. out equivalency, the 3208 and 6-71 are similar, though the edge See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. 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. engine technical data posted on their web sites. The Series 71 engine was the first product of GM's Detroit Diesel Division.

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