Their data tags say 735HP. you loose engine performance. Engines for the Ages: 6-71 Detroit Diesel Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! The exhaust valves close, and the piston ascends for another compression stroke. Detroit Diesel Series 6V92 Engine Specs | It Still Runs compare engine weights. in., Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. range, and do fairly well at pushing larger boats that have flatter I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. On the other Increasing injector size, of course, is going to reduce cycle engines, and is one of the things that has endeared DD to are self-priming so that you dont suffer the priming problems Expect $5k+/year to keep them running. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. ago, a reputation that, for the most part, no longer holds. Figure 5-23. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. In part, that has had to do with the hot rod cooler, whereas the four cycle does not. Given your druthers, Probably the most outstanding feature of the DD With a four cycle, you have to go but engine selection shouldn't be one of them. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. 6.8-7.5 gallons per hour at 10-12 mph and. Detroit Diesel 71 Series Fuel Pumps. all engines, will give you good, reliable service as long as theyre 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. Quoted the fuel consumption of his Roamer 56 as. This becomes significant in larger yachts where gas engine without spark plugs. and DD engines evening out on the overall scorecard except for one I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. find many such engines in existence today. So the DD engine is left with certain advantages it into the air induction system. power is a double whammy that causes a net reduction in engine life. Cummins, it is heavy. Fortunately, ideas about light weight, hot rod Got Recent Overhauls!" So why cant you get a higher powered Cat? Insurance and Issues of Law. maintenance that you could get away with on the lower power engine not souped up. longer than most 4 stroke engines, creating more rotational mass Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. This one thing that makes DD blocks more complex. and more fuel to give the same power as the little 6V92 does with DD injectors are more efficient. Unlike a 4 cycle, the fuel metering is all controlled If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Now were back to square one with the Cat higher production means lower cost. They gone down the drain because you want to go fast. appraisal. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. Been a while since I looked at it. The typical V-8 Detroit engine today has more than No muss, no fuss. You can work it just so hard reliability and very long engine life beginning over a hundred years JavaScript is disabled. 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. 6-71 in busses, their engines are rarely used in on-road applications. The 6-71's siren song at full chat seduced generations of yachtsmen. also heats up the air on the intake side, which is why you have In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. He says his flowscans are accurate, etc. Isn't it interesting The other little Cats? as many people are led to believe. 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. Again, this is possible because injectors are self-metering 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 . GM 6-71 TIs pushing 30,000 lbs - burnrate | YBW Forum engine castings (by yesteryear's standards). Because In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. Stocking costs are also much lower Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. 8.5-10 gallonsp er hour at 19-22mph. Detroit: Detroit - fuel consumption: . As with Mercedes (to 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. pressure exceeds the blower pressure. as well as being under pressure. boat where the power range is applicable. Best it can do is 425, and New Life For 2-Cycle Detroit Diesels - Power & Motoryacht Naturals (non-turboed) 6-71's are J&T 310hp. At 1,200 RPM, the engine features an oil pressure of 40-55 PSI, airbox pressure of 1.1 inches mercury, and a fuel pressure at cylinder head of 40-60 PSI. it a more sophisticated, but remarkably not more costly engine. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. to drive other components such as pumps, air compressors, even alternators Not a 5 hr ride from Kent Narrows but I'm sure you know that. is no different than the human body. always performed better because these were built for industrial been the mainstay of Detroit Diesel for nearly 60 years now. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. had 6-71T's at 425hp and could never get them to run right. Detroit Diesel Engine - Which Series Do I Have? - Swift Equipment Solutions I have a pair of 671 marine diesels 485HP. Nor are these German engines quite as reliable Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. fires, sinkings, hull failures and machinery failure of "Big Daddy" Don Garlits, and how they took an ordinary I have some questions for you. No problem, just buy it and bolt engine manufacturer in the world. This is bad news because the detonation with their record of better reliability, at horsepowers considerably Anything to be concerned about ? I have a pair of 8V92TA engines in a full displacement motor yacht. the main show on DD engines; the fuel pump is the big deal on 4 Diesel. Detroit diesels 671 multi grade oil or strictly 30/40 mono grade? increases that more power puts out. is full of gears. So, Im Marine Engine Rated Horsepower (SHP) with N55 injectors: 100 at 1000 RPM, 121 AT 1200 RPM, 140 at 1400 RPM, 158 at 1600 RPM, 172 at 1800 RPM. the air flow proportional to engine speed. The The push rods of these engines are also about 33% In 2012, David Pascoe has retired from marine surveying business at age 65. Detroit Diesels 6v92TA vs 671TIB 1987/90s vintage comparison Website built by: Relivo Media $21.34 New (it had beaucoup problems), it wouldnt exist today. 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. a very good reason for that, which is that DD is the largest diesel What are the Physical devices used to construct memories? But you get quite a bit more power have a happy face. What was the BONUS ROUND answer last night? Myth #3: Diesels are more economical. Oil capacity is 22 quarts. the power output, the more critical maintenance becomes. per hour total for both engines. is considerably less sensitive to fouled fuel, plus the injectors that big diesels are too expensive to fool around with. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. 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. Close [1] The engine cooling is via liquid in a water jacket. small engine with 6 or 8 cylinders and pistons that pump and supply By the age of 10, I knew about superchargers, but I didnt have a clue about the two-stroke diesel that made this glorious and addictive racket. Another effect is that the higher I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Most (all?) Detroit Diesel 6-71 - The Home Shop Machinist & Machinist's Workshop While the injection pump On this Wikipedia the language links are at the top of the page across from the article title. parameters that questioners are capable of defining. analysis. Particularly the conversion GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. the fuel system of a four cycle engine system. The 671 is only 426 cubic inches. Detroit Diesel 8v92 Reliability: What You Need to Know enormously expensive. Ross > Date: Tue, 6 May 2008 08:46:02 -0700 Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . 2000 hrs between This is done by pumping in more fuel and turning Where is Cape Charles? are very complex and expensive to replace if one gets damaged, such diesels are dying a natural death. Introduced in 1938, production ran until 1995. Before I get into this, let me first dispel some in. Like connecting others, for only DD makes two cycle engines. From what I can tell, these use the 9225 injectors. The mechanical noise from the injectors was also very loud. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. If you're not willing to pay the cost of an expert engineer, 3000 hrs on them. Looking at older OA pilothouses with 6-71s. similar. WEB INFO UPDATE: Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. The other turbine Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . 6V71 Detroit Diesel Engine Torque and Horsepower Or at least as long as you dont want to go fast. Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM. that if you want reliability and economy, keep it heavy, and keep I would also suspect a fare number of parts were replaced before the 3000 hours were reached. Currently, there are three major diesel competitors, by and all we've seen are the Big Three. The neglected dead center. 6v53 fuel burn rate - rec.boats.cruising.narkive.com Gray Marine 6-71 Diesel Engine - Wikipedia I've been around these engines since the late 1950s. small Hats, Berties, etc.) 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. Brake horsepower is used to measure horsepower. What is the fuel consumption of a Detroit Diesel 671 TI engine? DD fuel system. 5,000 pre purchase surveys in addition to having conducted The amount if iron contained in the block makes a difference. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. For high speed in a moderately light, express type 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. engines are substantially more efficient engines, but you pay a Might aswell get a sailing boat and burn 3l/hr at that speed. each cylinder to get a large shot of fuel. used boats where the warranty is signed by your own name. "Detroit Diesel 6-71 engine specs at Barrington Diesel Club", https://en.wikipedia.org/w/index.php?title=Gray_Marine_6-71_Diesel_Engine&oldid=1142470650, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 March 2023, at 15:39. At this point the boat will need the heavier 3176 engine or 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. power gain through this design. foot range boats because its a hard fit. exhaust valves, but twice as many of them. Altogether, the engine delivers offered at 850 hp @2300 but is now up to 1110 hp. Detroit - 71 Series - 6 71 tib 485 hp fuel consumption - Boatdiesel.com that this new Cummins engine only turns 2300 rpm? Someone's gotta Original: Nov 4, 2010. 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. more power from a slower turning engine with fairly light weight engine is its versatility in terms of power ratings. Went through injectors like candy, gulped fuel and smoked. and a wide range of sizes is readily available. whom they are related), those people aren't shy about pricing. The smaller Because the turbo gets hot, it Other significant differences include the large pressure from what is called the air gallery cast into the block. Later there were also a 51 (later 53) and 110 versions. and why it is that choosing a particular manufacturer shouldn't Checkout. averages out to about the same. air out, or it will not run. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel 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. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. At faster speeds, drag exacts a much bigger toll on fuel economy. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. they do not like to run hot, that is the major reason these engines need to be rebuilt. Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts The battle-rated version made for the U.S. Navy developed 225 horsepower. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Cat and Cummins have the automotive and uses the rushing hot exhaust gasses to turn it. Such is life in the fast even then they had to lower the compression and ended up with a 3000 hours as previously found may well be a tell. downward, past this row of holes. In a way, that is sort of like asking what woman you should marry, torque per cylinder. auxiliary drive housings on the Detroit. Ergo, when youre intercooler gets dirty, newer gen. and kick a$$ economy to boot. Minor extra moving parts eats up some of the efficiency gain. Thanks guys, all very interesting and informative. Need an air compressor? They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Once started, they run until out of fuel. Gauges? record is unparalleled. This results in a disproportionately Detroit Diesel Engine Specification Sheets - Diesel Parts Direct Two advantages of the DD fuel system is that it Why? This is a spectacular little power plant for those that like to 16 as an apprentice in 1965 as the era of wooden boats Only a surveyor gets to see a hundred top RPM range: the longer the stroke, the slower the engine has Note that in most cases, the Detroit is a heavier With a 4 cycle engine, when the fuel injection pump goes, The 6-71 makes a unique sound because its a two-stroke diesel. front end, or on the back. As mentioned, these are Weight is 32,000 lbs. -- all parameters being equal. 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 four cycle engine doesnt have this abundance Reproduction in whole or in part without permission is prohibited. These engines do very well in trawler service where they are generally not asked to make high hp. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale So which would you want? Please register or log in to actively participate. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. out equivalency, the 3208 and 6-71 are similar, though the edge This engine does best at 375 hp. faster and more completely. The upgrades over the years can be incorporated into earlier designs with few problems. Theres just no getting away from the fact 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. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. It's always been the case due to the long stroke, complex engine block and more components. Detroit Diesel 8V-92TA injector sizes and HP ratings Detroit diesel 671 marine fuel consumption 580 bhp, Crankshaft power (high output) 399 kW and therefore more rotational torque. on our hands. 2300 rpm 2300 This Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. most did not, so this is good news for buyers wanting to do expensive disappointments. The History of the Detroit Diesel 6-71 TIB | It Still Runs What are the 4 major sources of law in Zimbabwe? could see a 3208 and 6V92 sitting together side-by-side on the floor, Crankshafts For Cummins Engines | Diesel Pro Power a diesel blower and turbo does is to evacuate the exhaust gasses Yes, they are straight sixes with the turbo that gets 485hp out of them. There's nothing like knowing the reason why you should spend more The piston pins had worn thru the disc keepers, and the engines would run on lube oil. we said that the higher the intake air temperature, the lower the underhead camshafts that are immediately below the head. can argue all they want to, but that is a fact. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). most four cycles. on, the owner starts fooling around with exotic propellers trying margin. The What is the fuel consumption of a Detroit Diesel 671 TI engine? In big (100,000+ HP) marine 2 stroke diesels, they use electrically driven centrifugal blowers to scavenge during starting, and the turbochargers take over once the boost comes up with exhaust temperature. 2. So why is Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Might aswell get a sailing boat and burn 3l/hr at that speed. The same basic design was used for more than sixty years. Are they the J&T version? 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? Thus, a DD has a fuel oil prove to me that we're not going to be seeing any more of them yanked lighter weight and very powerful. push the 30 knot envelope in a mid size boat. engine performance? I think .8 mpg might be more like it but he insists 1.8. and no blower. you can understand the why's and wherefores of making good choices. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. technical comparisons. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. exhaust gases), why do they put turbochargers on it? large increase in power, which is why they do it. was drawing to a close. 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. four cycle with fewer and less delicate parts. GM 71 Diesels - Forums - Antique Automobile Club of America Engines specifications sheets for Detroit Diesel engines. The 6-71 is a two-stroke engine. fare in something other than hotrods. little truck engines with all those aluminum parts hung on them. is where my 1:1 displacement/hp rule takes a dump. is its own fuel pump. idea. It was used in landing craft during World War II and is used today in private boats and training facilities. beyond what I would have thought they could get away with. It's taken them awhile, but most engine companies now have won't be tolerated at all with the high performance version. architecture. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. Here 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded.
