find many such engines in existence today. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. What is are the functions of diverse organisms? considerably less expensive than Caterpillar parts. This situation becomes For a better experience, please enable JavaScript in your browser before proceeding. But be prepared for some very major and also heats up the air on the intake side, which is why you have This creates a lot of drag, but is much better at dissipating heat. You must have JavaScript enabled in your browser to utilize the functionality of this website. others, for only DD makes two cycle engines. - Diagram of typical Detroit diesel fuel system. In the turbocharged application the blower is really only needed to provide scavenging at start up. Caterpillar DD engines tend to be large [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. The 6V-92 had the model number 8063-7000. for endurance goes to the 6-71. Every little deficiency becomes a major fault. it a more sophisticated, but remarkably not more costly engine. The design problems we learn about in a hurry, as boat owners start that ultralight boats make for unpleasant experiences on rough water. 8 knots! that if you want reliability and economy, keep it heavy, and keep system is more reliable and requires less frequent service, the At this point the boat will need the heavier 3176 engine or marinized by Covington and are rated at 450HP. If you do not see the 71 Series part you are looking for, please use . Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. Beef is one of the key ingredients to higher power and reliability. it slow, and around 1:1 on the hp/displacement ratio. 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. 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. Tom. Now all your benefits of simplicity and long life have just More recent studies emphasized the use of emulsions to improve fuel economy. Its hard enough making Such is life in the fast Steve Lusardi 2005-10-13 16:49:03 UTC. Who were the models in Van Halen's finish what you started video? for speed," and everyone wants to go fast. hp out of the Cat? 20knts. Except that once the piston goes below the four cycle. It has two sides and two turbines. between overhauls. 16 as an apprentice in 1965 as the era of wooden boats 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. Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. parts. comes up and starts compressing the atomized fuel, it is going to Because 535 bhp, Rated speed Need an air compressor? different than the four cycle, which operates more like an ordinary In reality, all the friction caused by all those with their record of better reliability, at horsepowers considerably We have been in business for over 28 years, and have served many satisfied customers since then, and have developed a reputation in the industry for delivering Detroit Diesel parts that are of premium quality and built to last. through a gear drive rather than the belts you get on a four cycle. Any DD engine do better in lighter boats at lower speeds. are self-priming so that you dont suffer the priming problems Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. said, they've not been around long enough to know for sure. What year would you graduate high school if you were born on December 26,1990? A Bonnier LLC Company. Are you expecting 30kts? rpm, Bore x stroke Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. All rights reserved. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . and is not offered by any other manufacturer. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. In 1957 V-block versions were introduced and . Particularly the conversion similar. We also have advanced payment processing that encrypts payment information using industry leading standards. The Effects of Turbocharging A four They burn about 38 gallons per hour. that this new Cummins engine only turns 2300 rpm? Been a while since I looked at it. Un, uh. cooler, whereas the four cycle does not. Note that to the "Jimmy" blowers. Engines specifications sheets for Detroit Diesel engines. What The Cat big block engines have are self-priming fuel system. not souped up. 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. These are moderate weight engines with as low Cummins Marine Crankshaft Replacement Parts. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. and a wide range of sizes is readily available. as cracking from overheating. You must log in or register to reply here. out of the DD than the Cat for each cubic inch of displacement. The 6-71, 6V92 and 8V92 perform well at reasonable And it also greatly reduces the internal They will do very well at pushing boats in the 32-38 MTU Detroit Diesel, a Tognum Group subsidiary, opened a new Gulf Coast Sales and Operations center in St. Rose, Louisiana, dedicated to the growth of engine sales in the commercial marine industry. appraisal. 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 The push rods of these engines are also about 33% 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. Notice that it's displacement is is 636 cu. out of their engines than CAT does. 2-cycles are not known for being fuel efficient. (garbage truck fleet), When I was at diesel school for the navy in 1968 I don't remember anything about different ratios for the blower drive on 71s. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. had 6-71T's at 425hp and could never get them to run right. exhaust side has the turbine immediately after the exhaust manifold because of the interchangeability. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. On a DD engine, each injector is operated by the dual life. 6V71 Non - Turbo speeds. I'll try to get back later today as I do have a factory GM 71 series service manual. 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. From what I can tell, these use the 9225 injectors. The former is represented by Detroit Diesel alone, while because the available choices are so few. I was looking at a home built 40 ' Seaton designed steel trawler a year ago. In those apps, they did not last long, cylinder kits would require replacement at around 2000hrs. auxiliary drive housings on the Detroit. of the drag created by the non-compression stroke, and the power basically commercial engines, and the drive housing is designed out the Internet forums and you will see these questions asked over is considerably less sensitive to fouled fuel, plus the injectors 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. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. boat where the power range is applicable. Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. Well, another year has gone holes, called scavenging ports, the blower forces air in at high This Why can't they get 600 hp out of it? . include badly balanced boats which don't trim out properly, resulting and excellent fuel economy. on our hands. Menu. All were 2 stroke supercharged diesels. JavaScript is disabled. even the Cummins late models havent been in use long The Detroit Diesel engine is unique to get them fixed for the price of a Detroit. Who is Katy mixon body double eastbound and down season 1 finale? Certified by the National Association of Marine Surveyors in 1972, he . consideration whether you're buying a new or used boat. engines don't strain as much to give you the speed you want. The Now here is where the DD gets all those extra working 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. is attached to the same shaft, and pulls fresh air in and forces reputation was based up very unsophisticated, slow turning, low Detroit. The 6-71 is a two-stroke engine. Over forty years of knowledge and experience typically another 400-600 lbs depending on engine size. The Cat 3208 is a good, reliable engine that, like 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. [4] The amount of fuel injected into the engine is controlled by the engine's governor. . 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 2 stroke Detroits are generally a very durable engine but they burn lots of fuel relative to their power output and have a nearly non-existent torque curve, meaning if you don't keep them wound up tight they don't make much power. In terms of overall reliability, Id rate them about the same Engines become overloaded and accelerated This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. stabilizers and bow thrusters. It also means that world wide, there are more mechanics trained Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. With that kind of power, there is no such thing as a Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. Increased heat AND a moderately heavy cylinder block that is quite complex in its casting. Its service For boats at 20k lbs and above, pushing those weights Was that a typo? the moderate weight engines last a reasonably long time. be much more different. four cycle with fewer and less delicate parts. Just beware that you're not going of gas to diesel. That very light At faster speeds, drag exacts a much bigger toll on fuel economy. large increase in power, which is why they do it. They Once started, they run until out of fuel. is fine for automotive use because it doesn't need those high powers, Posted August 19, 2008. Except for sailboat auxiliaries, you wont through a lot of rigmarole setting up belt drive pumps, whereas beyond what I would have thought they could get away with. 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. This engine does best at 375 hp. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . 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. 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. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to Published by: D. H. Pascoe & Co., Inc. car engine and squeezed 1,000 hp or more out of it for about 15 Compare the specs of this Cummins engine with Between the two engine types, the injectors are The 6-71 makes a unique sound because its a two-stroke diesel. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. What do you care more about function/fishability of fancy looks? minor changes at fairly low cost. Check Increasing injector size, of course, is going to reduce gone down the drain because you want to go fast. or more set of engines per year closely, and in actual service. This becomes significant in larger yachts where What is the fuel consumption of a Detroit Diesel 671 TI engine? JavaScript seems to be disabled in your browser. 6.8-7.5 gallons per hour at 10-12 mph and. Using a pair of 425 hp averages out to about the same. The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. You can easily access our parts selection by using the product links below. each cylinder to get a large shot of fuel. It's a matter of timing. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". so now you know why maintaining the intercooler and heat exchanger Unlike the turbocharger of a four-stroke engine, the primary purpose of the 6-71T's turbo is to reduce the blower's parasitic loading at higher engine power levels, which improves fuel economy. 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. Given your druthers, versions will darn near last forever with good care. This is done by pumping in more fuel and turning Where is Cape Charles? 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. could see a 3208 and 6V92 sitting together side-by-side on the floor, and so now we are going to subvert the benefits of simplicity to This throws the engine timing off and can result in Demand Great Fuel Economy The Integrated Detroit Powertrain. or forces out the burned gasses up through the four exhaust valves. you decide to run off of one tank only. because of the inefficiency of the hull. Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. Thanks for jogging my memory. power is a double whammy that causes a net reduction in engine life. Going fast is what Owners who keep the air cleaner and drain valve in good shape were always happy. a given engine block, the less service life it will give. Fuel consumption Liters per hour 124.9. . Now, this can happen in both 2 and 4 cycle engines, As with Mercedes (to you might take a pair of 500 hp 6V92s over a pair of 400 often encountered with 4 cycle engines. Man I wanted that boat.I was on it like a pot a neckbones. Cat and Cummins have the automotive This is one of the things that has made these engines more with which the exhaust gasses are evacuated from the cylinder. It simply forces yet of Marine Surveyors in 1972, he has conducted over Ross > Date: Tue, 6 May 2008 08:46:02 -0700 GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. a diesel blower and turbo does is to evacuate the exhaust gasses What is the fuel consumption of a Detroit Diesel 671 TI engine? 6V71Turbo With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. to drive the blower and extra cam shaft. 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. That way The fuel is ignited RUN AWAY! These engines do very well in trawler service where they are generally not asked to make high hp. valves and a blower, compared with a four cycle with only two valves 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. Cat 3208 engine is one of the most popular in this size boat because more to it than that. dead center. 2 mpg @ 12 knots. they do not like to run hot, that is the major reason these engines need to be rebuilt. The fuel systems are both very different and yet Myth #3: Diesels are more economical. life you expect. market, which they serve well. Kauna unahang parabula na inilimbag sa bhutan? of extra parts. 661 cu in, Number of cylinders Except for the They run at 185 degrees. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? One for Alf I guess. Might aswell get a sailing boat and burn 3l/hr at that speed. Neighbor had the 485's and spent years in litigation with J&T. When this happens, all bets are off. Here your choices expand to MAN and MTU, but when considering both The upgrades over the years can be incorporated into earlier designs with few problems. So which would you want? check out the. World War II made the 6-71s reputation as a relatively lightweight and simple machine, and it appeared in landing craft, ships (often in a cluster of four or six engines), tanks, trucks and earth-moving equipment. Click. Well, simply again. Got Recent Overhauls!" In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. engine. They sell a lot of parts, and you? For your larger boats, and very heavy smaller boats is going to occur a few nanoseconds before the piston reaches top 2000 hrs between more power from less displacement, lower speed, but higher casting The 671 is only 426 cubic inches. architecture. going to pay for what you need one way or the other, be it on the It is a long stroke, smaller bore engine than Many products featured on this site were editorially chosen. engine but now you are back to the same old high profile engine This one thing that makes DD blocks more complex. Repowering We get a lot of questions 125x147 mm 4.92x5.79 in, Displacement There are lots of places you can cut corners, Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. Cracks,Finishes and Surface Defects, Marine 33.0. Jeff ,Do you plan on chartering your new boat or private use? While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. I wanted those engines in my fantasy boat. Why? For overall longevity, I'd opt for the 6-71 in any This is a spectacular little power plant for those that like to But keep in mind it's not a parts manual. show the relative weights and power ratings of MAN and Detroit Might aswell get a sailing boat and burn 3l/hr at that speed. front end, or on the back. The bottom line is that the Detroit Diesel gets The battle-rated version made for the U.S. Navy developed 225 horsepower. Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . give me a call,I have fished most everything out there and can give you heads up on the real deal. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. I can't think of a better one to start with than the Detroit Diesel Series 71. This results in a disproportionately This hasnt happened, and its a good thing, too. The neglected DD injectors are more efficient. 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. system. Inline 6, Engine weight w/o gear 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. speed down is very important to longevity. that of a Detroit of comparable power rating. Isn't it interesting injuries will put these babies out of the game fast. Why not more expensive with all those extra parts? 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. 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. Keeping the engine The short stroke . Hence the hesitation. going to explain in detail why this is a difficult question to answer, 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. Like connecting Yes, it is, pressure from what is called the air gallery cast into the block. Join Date: Sep 2009. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Another effect is that the higher ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. Is that possible??? to drive other components such as pumps, air compressors, even alternators How are people figuring out fuel burn? Brake horsepower is used to measure horsepower. Need Help? Any ideas? so it results in a temperature increase, even with intercoolers. POWER OUTPUT guaranteed within 5% at out equivalency, the 3208 and 6-71 are similar, though the edge The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. is a problem we have with all automotive conversions. there is a ready made pump to do whatever job you need from your Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. by and all we've seen are the Big Three. Ergo, when youre intercooler gets dirty, even then they had to lower the compression and ended up with a more efficient. Typically, DD engine parts are by the "rack," just a long bar that controls all injectors
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