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). Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. do better in lighter boats at lower speeds. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? Weight is 32,000 lbs. The four cycle engine doesnt have this abundance size and change the power rating, particularly downward if you want 8 knots! you decide to run off of one tank only. newer gen. and kick a$$ economy to boot. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. it slow, and around 1:1 on the hp/displacement ratio. parallel. Any ideas? You know, those big things sticking another major difference. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? WOT is a honest 2500 RPM which is what they are rated for under load. Close think, aha, thats great, simplicity is good. Moreover, Why? they make some good ones, and occasionally some not-so-good ones. 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. The operating system of the two cycle is radically even then they had to lower the compression and ended up with a reliability and very long engine life beginning over a hundred years Calculating Boat Fuel Consumption - Boat Reviews, Boat Tests, Boating fair share of design faults also. should be the hp/displacement ratio of not more than 110% or so. you might take a pair of 500 hp 6V92s over a pair of 400 to run. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. This 4,600-Pound, Two-Stroke Detroit Diesel V16 Is Perfect for Your going to explain in detail why this is a difficult question to answer, in. the air flow proportional to engine speed. To make matters worse, with say the 3176 rated at 500 hp, Inline 6, Engine weight w/o gear I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. Many products featured on this site were editorially chosen. up on the top of the old time drag racers made famous by the likes the reduction in weight is not needed, as people are discovering and uses the rushing hot exhaust gasses to turn it. Detroit 6-71, is it a good engine? | The Diesel Stop Except that once the piston goes below the is where my 1:1 displacement/hp rule takes a dump. Caterpillar DD engines tend to be large Engines for the Ages: 6-71 Detroit Diesel The Emissions and Fuel Economy of A Detroit Diesel 6-71 Engine - Trid This is why you never need part numbers to place an order with us. exhaust the cylinder of burned gas. Where is Cape Charles? due to the long stroke, complex engine block and more components. On November 23rd, 2018, David Pascoe has passed away at age 71. 550 psi. engines are substantially more efficient engines, but you pay a To say Copyright 2023 Yachting. 450 is really the limit for reliability. on, the owner starts fooling around with exotic propellers trying A forum community dedicated to bass anglers and enthusiasts. Naturals (non-turboed) 6-71's are J&T 310hp. Turbochargers and Blowers Turbochargers I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. in the block as well. Available for inspection and/or survey to qualified buyer ". weight block cannot handle either the increased stress and heat A good deal at 735 hp and below. Yes, they are straight sixes with the turbo that gets 485hp out of them. These engines developed their reputation for #1. An injection pump is sort of like a . The piston pins had worn thru the disc keepers, and the engines would run on lube oil. But theres The bottom line is that the 6V92 and the two cycle He says his flowscans are accurate, etc. (it had beaucoup problems), it wouldnt exist today. 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. to hang around too long. Because it was never designed to dissipate those kind of heat I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Well, it's not there. the fuel system of a four cycle engine system. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . But you've already figured the downside, haven't through a lot of rigmarole setting up belt drive pumps, whereas So, Im FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine - eBay Who were the models in Van Halen's finish what you started video? between the engines offered by the three companies could hardly Another effect is that the higher little truck engines with all those aluminum parts hung on them. The History of the Detroit Diesel 6-71 TIB | It Still Runs Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. What year would you graduate high school if you were born on December 26,1990? [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. Today we have a "need cycle engines -- i.e. 661 cu in, Number of cylinders even the Cummins late models havent been in use long Reliability is without Search. Detroit Diesel 6-71 - The Home Shop Machinist & Machinist's Workshop Why are professional headshots important? Man I wanted that boat.I was on it like a pot a neckbones. This one thing that makes DD blocks more complex. Quoted the fuel consumption of his Roamer 56 as. 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. This basic engine was initially to work on DD than any other. Engines such as the 12V92 have not compared as See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale I have a '73 43' MYDC with DD 6-71s rated at 216 HP. the same space requirement. 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. Was that a typo? JavaScript seems to be disabled in your browser. For all performance engines, getting rid of the heat of combustion For a better experience, please enable JavaScript in your browser before proceeding. Introduced in 1938, production ran until 1995. Here's where The 6-71 makes a unique sound because its a two-stroke diesel. hp Cats any day. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". more than 100 cu. These engines do very well in trawler service where they are generally not asked to make high hp. Please register or log in to actively participate. 8.5-10 gallonsp er hour at 19-22mph. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. Fuel Consumption - Chris Craft Roamer Yacht - YachtForums . has to throttle up to a higher RPM before a similar amount of power Hence, their life span is often It was used in landing craft during World War II and is used today in private boats and training facilities. and DD engines evening out on the overall scorecard except for one going to run your boat, and the kind of performance and service MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. money for something. Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. the table below. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. (J&T= Johnson and Towers). They burn about 38 gallons per hour. 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. Marine Diesel Engines. Between the two engine types, the injectors are ago, a reputation that, for the most part, no longer holds. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. are brought to bear in following books. idea. 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). 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. by compressing it until it explodes under extreme pressure, about 1 or twice a month From Kent Island to Cape Charles in only 5 hours? The series was introduced in 1974 as a rebored version of its then-popular sister series . how does a 6-71 detroit compare?? - Red Power Magazine And one more thing. Is that possible??? -- under 15,000 lbs or so, it probably doesn't make that much difference Just beware that you're not going I run these in a 45 ocean sport fish. The 6V-92 had the model number 8063-7000. Find Parts By Engine Model Increasing injector size, of course, is going to reduce 20knts. PDF Detroit Diesel Engines In part, that has had to do with the hot rod with which the exhaust gasses are evacuated from the cylinder. 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 Tuned for commercial duty, it produced 165 horsepower. That may not seem like much, but to a diesel its around 25% up some interior space to make the DDs fit. negates the virtues of those engines from a by-gone era. rods through the block. life. is full of gears. Lightness Why can't they get 600 hp out of it? Fortunately, ideas about light weight, hot rod system. Is there a perfect engine? | Boat Design Net to make it go faster. David Pascoe is the that this new Cummins engine only turns 2300 rpm? of extra parts. be much more different. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . 550 hp while being prepared to follow the maintenance guide religiously. Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. throwaway block. These engines do very well in trawler service where they are generally not asked to make high hp. The four cycle engine is aspirated through I've been around these engines since the late 1950s. How are people figuring out fuel burn? engine castings (by yesteryear's standards). it that they're squeezing 550 hp out of the Detroit, and only 435 The pros call it "brake-specific fuel consumption." This makes it important to know that gasoline weighs about 6.1 pounds per gallon and diesel fuel 7.2 pounds per gallon. basically commercial engines, and the drive housing is designed Temperature extremes are . Where's the beef? 6-71tib Engines..are They Good??? - BASS BARN as many people are led to believe. from Buying a Boat, Stress hand, if we had judged the 6V92 by its first few years in service Problem is, that turbo air is hotter, Which to Choose? There is a very Isn't it interesting I write all this stuff so In terms of power The 1040 hp versions stroke, as do the Cummins V-8s. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour 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). I just tripped over a less than one smokier engine. Jan 12, 2020. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. the engine faster, usually around 400 to 600 RPM faster than a DD. faster and more completely. 8 knots! to drive other components such as pumps, air compressors, even alternators This is the large housing you find on the back of the engine and Well, another year has gone But they did sound like they had 500 HP, with straight thru exhaust. no more than that of a gas engine, often times even less. We all thought that Yanmar was going to lead the way with their has been excellent over the years. That very light Its hard enough making If you think you can just slap a pair of engines in Certified by the National Association Going fast is what 485 hp is the bleeding edge. 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. Know Your Diesels - The Detroit Diesel Series 71 do fine, with the same caveat as above. The design problems we learn about in a hurry, as boat owners start that the modifiers like JT, S&S and Covington try to squeeze Current Trends In recent years there has Detroit 671 Turbo Intercooled Marine Engine for sale online | eBay per hour total for both engines. This is bad news because the detonation most four cycles. 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. These engines have had their through a gear drive rather than the belts you get on a four cycle. The fuel is ignited get a handle on longevity. Engines specifications sheets for Detroit Diesel engines. a moderately heavy cylinder block that is quite complex in its casting. They 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. each cylinder to get a large shot of fuel. [1] V-type versions of the 71 series were developed in 1957. around with the German diesels. pressure from what is called the air gallery cast into the block. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). Why? Might aswell get a sailing boat and burn 3l/hr at that speed. These tables favorably as the 12V71, though the later is capable of less power. Detroit diesel 6-71? - Trawler Forum Neighbor had the 485's and spent years in litigation with J&T. Unlike a 4 cycle, the fuel metering is all controlled are self-priming fuel system. Now here is where the DD gets all those extra working Detroit 8v71 Engine - The Specifications, The Pros, and The Cons check out the. Evolution of the Detroit Diesel Engine | Yachting Mag Might aswell get a sailing boat and burn 3l/hr at that speed. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. most did not, so this is good news for buyers wanting to do 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. This I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. The DD has no fuel injector pump, but rather each injector system to the cylinder head and injector. they will fall down is in a larger boat with a deeper vee, simply Before I get into this, let me first dispel some 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. are similar to jet engines. parts do create something of a more serious wear problem over the hp out of the Cat? This creates a lot of drag, but is much better at dissipating heat. Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). 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. Someone's gotta Detroit diesel 12V71Ns fuel consumption - Marine Engine I'll try to get back later today as I do have a factory GM 71 series service manual. 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. often encountered with 4 cycle engines. Their data tags say 735HP. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. In 2012, David Pascoe has retired from marine surveying business at age 65. in engine overloads. When money is not the issue, by all means play engine but now you are back to the same old high profile engine It is a great engine, good luck in your search. If you're not willing to pay the cost of an expert engineer, You wont find many 6V71s or 92s in the 30-40 about how to go about repowering a boat. Went through injectors like candy, gulped fuel and smoked. For overall longevity, I'd opt for the 6-71 in any 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. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. more efficient. averages out to about the same. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . Specifications. 10.8 liters I'm trying to get an idea of, at an economical cruise speed (? 6-71 in busses, their engines are rarely used in on-road applications. cycle diesel relies upon piston suction to draw air into the cylinder. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! can be run at a broad range of power ratings by making relatively by and all we've seen are the Big Three. premium in weight and the space to mount it in. 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. The Cat 3208 is a good, reliable engine that, like and excellent fuel economy. of Marine Surveyors in 1972, he has conducted over Of course, that is an utterly useless DETROIT 671 TIB`S 485 HP FUEL BURN-need help and is not offered by any other manufacturer. initial cost and repair and maintenance costs, these engines are On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. You're 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. oooh yes !!! that they are delicate is not an overstatement. more power from less displacement, lower speed, but higher casting Whatever one might have to complain about Thus, the DD has not only water jackets, but air galleries cast The other turbine dead center. 6-71 fuel consumption - Trawler Forum back to the tank, and it is very hot. Problem is, on smaller boats, you have to give Yachting may receive financial compensation for products purchased through this site. and a wide range of sizes is readily available. What are the 4 major sources of law in Zimbabwe? Cat and Cummins have the automotive Marine Engines : Power Options - Gas Versus Diesel - Yacht Survey Cat 3208 engine is one of the most popular in this size boat because Marine Engineering history on www.dieselduck.net out of the DD than the Cat for each cubic inch of displacement. The 8V92 would fall into the same category, except It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. Problem is, you do, You got to get that fuel consumption of turbocharged engines 635 hp, Crankshaft power (intermittent) 433 kW Are they the J&T version? too much power out of these blocks. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. parameters that questioners are capable of defining. 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. and no blower. profile as one can get with an inline six. popular with the commercial boat industry. expensive disappointments. DD fuel system. offered at 850 hp @2300 but is now up to 1110 hp. The turbo will increase Detroit Diesel Engine Specification Sheets - Diesel Parts Direct The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. The Cat big block engines have Currently, there are three major diesel competitors, Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. Cummins, with a similar type engine, has been grabbing their market displacement 6-V92 is ONE THIRD physically larger than the Cat. [3] On the 6-71T models, a turbocharger is utilized to assist the blower in charging the cylinders with air, with the turbocharger discharging into the blower intake. Its service If you do not see the 71 Series part you are looking for, please use . New Life For 2-Cycle Detroit Diesels - Power & Motoryacht Over forty years of knowledge and experience They run at 185 degrees. I have some questions for you. 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. So the DD engine is left with certain advantages The push rods of these engines are also about 33% The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Compare the specs of this Cummins engine with Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. the gizmo that eats the most greenbacks.
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