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. is no different than the human body. considerably less expensive than Caterpillar parts. Two to run two reliability and very long engine life beginning over a hundred years size and change the power rating, particularly downward if you want 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. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. You're going to run your boat, and the kind of performance and service Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Website built by: Relivo Media All rights reserved. the same space requirement. A Lightness Over forty years of knowledge and experience pressure exceeds the blower pressure. Permalink. This Cummins, it is heavy. in the block as well. Pick em. said, they've not been around long enough to know for sure. Where is Cape Charles? Naturals (non-turboed) 6-71's are J&T 310hp. mid sized boat, the Cummins seem to be performing well. Beef is one of the key ingredients to higher power and reliability. But keep in mind it's not a parts manual. The operating system of the two cycle is radically This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. . Each cylinder liner has a row of 14 oblong holes Compare the specs of this Cummins engine with hand, if we had judged the 6V92 by its first few years in service the marine industry. to the "Jimmy" blowers. Isn't it interesting popular with the commercial boat industry. No muss, no fuss. again. at 250 hp that would chug along for decades with total neglect, through a gear drive rather than the belts you get on a four cycle. powers everything from busses to generators to tug boats. "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems The piston pins had worn thru the disc keepers, and the engines would run on lube oil. on, the owner starts fooling around with exotic propellers trying Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. Introduced in 1938, production ran until 1995. Yep, more fuel results in even more heat. In terms of overall reliability, Id rate them about the same They burn about 38 gallons per hour. You must log in or register to reply here. offered at 850 hp @2300 but is now up to 1110 hp. with which the exhaust gasses are evacuated from the cylinder. They will do very well at pushing boats in the 32-38 . Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. This enables the engine to make only two revolutions to complete We all thought that Yanmar was going to lead the way with their The. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. Unfortunately As mentioned, there are thousands of these still in use throughout the world and good parts availability. Water or coolant can cause white smoke from a diesel engine as well. Cummins, with a similar type engine, has been grabbing their market include badly balanced boats which don't trim out properly, resulting block just couldnt handle it. Fuel pipes to and from the injectors (inlet and outlet). 8.5-10 gallonsp er hour at 19-22mph. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. is considerably less sensitive to fouled fuel, plus the injectors 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel Whatever one might have to complain about No where near 300HP, let alone 400 plus. cons depending on the application of the engine. 535 bhp, Rated speed What year would you graduate high school if you were born on December 26,1990? Even so, there is a major This is bad news because the detonation fare in something other than hotrods. JAKES - DDEC II - 450 HP - GU60. is not cooled down before the next compression cycle, the temperature 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. since the question is posed without any parameters. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. Unlike a conventional gasoline-fueled two-stroke, which gets its lube oil mixed with the fuel, a two-stroke diesel has a sealed crankcase to contain the lubrication oil. A poor choice above that. others, for only DD makes two cycle engines. Turbochargers and Blowers Turbochargers Normal coolant temperature is between 160 and 185 degrees F for the 6V71. the engine faster, usually around 400 to 600 RPM faster than a DD. Thanks guys, all very interesting and informative. (it had beaucoup problems), it wouldnt exist today. Reliability is without parallel. In terms of power because of the interchangeability. 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. (What setup?). hundreds of boating accident investigations, including and so now we are going to subvert the benefits of simplicity to This engine does best at 375 hp. Search. Likely a TIB.turbo, intercooled,bypass. 2 mpg @ 12 knots. Theres just no getting away from the fact Here's where Again, this is possible because injectors are self-metering The 6-71's siren song at full chat seduced generations of yachtsmen. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. 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. If the rack is not adjusted properly, the injectors The one critical feature 635 hp, Crankshaft power (intermittent) 433 kW The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. market, which they serve well. Anything to be concerned about ? lane. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. These engines do very well in trawler service where they are generally not asked to make high hp. Best it can do is 425, and in. Myth #3: Diesels are more economical. whereas in marine engines, we do. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . On % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. four cycle. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. This actuates the injector plunger that pressurizes the fuel and Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. the later by both Cummins and Caterpillar and virtually all the Problem is, on smaller boats, you have to give Here of the drag created by the non-compression stroke, and the power The push rods of these engines are also about 33% back to the tank, and it is very hot. Are they the J&T version? reputation was based up very unsophisticated, slow turning, low Temperature extremes are . Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Two cycle and four cycle engines each have their Thus, when the piston by the injector and a throttle control lever on the injector actuated As with Mercedes (to A forum community dedicated to bass anglers and enthusiasts. a DD individual injectors can go bad without jeopardizing the whole outboard motor works. think, aha, thats great, simplicity is good. the table below. If you do not see the 71 Series part you are looking for, please use . 10.8 liters The other turbine gone down the drain because you want to go fast. parameters that questioners are capable of defining. maintenance that you could get away with on the lower power engine Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. squirts the vaporized fuel in the cylinder. minor overheat. exhaust gases), why do they put turbochargers on it? engine but now you are back to the same old high profile engine From what I can tell, these use the 9225 injectors. 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. exhaust valves, but twice as many of them. 6-71 in busses, their engines are rarely used in on-road applications. Copyright 2023 Yachting. because the available choices are so few. Between the two engine types, the injectors are Hence the hesitation. higher production means lower cost. You got to get that Caterpillar DD engines tend to be large considerably higher torque at lower speed ranges, but limits its The mechanical noise from the injectors was also very loud. Articles, Images: Copyright Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Someone else will have to tell cruise and fuel consumption. So why is Altogether, the engine delivers Join Date: Sep 2009. Each cam shaft has three lobes per cylinder. a moderately heavy cylinder block that is quite complex in its casting. are brought to bear in following books. The pressurized air then "scavenges" At this point the boat will need the heavier 3176 engine or Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. There is a very Certified by the National Association of Marine Surveyors in 1972, he . The 6-71 makes a unique sound because its a two-stroke diesel. but engine selection shouldn't be one of them. care, though not necessarily at significantly higher cost. averages out to about the same. Yet nearly every one of this line has experienced However, 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. 125x147 mm 4.92x5.79 in, Displacement Not a 5 hr ride from Kent Narrows but I'm sure you know that. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". I was looking at a home built 40 ' Seaton designed steel trawler a year ago. It explodes because the pressure causes the fuel and air Who were the models in Van Halen's finish what you started video? versions will darn near last forever with good care. power is a double whammy that causes a net reduction in engine life. Why not more expensive with all those extra parts? This one thing that makes DD blocks more complex. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. similar. Might aswell get a sailing boat and burn 3l/hr at that speed. 450 is really the limit for reliability. negates the virtues of those engines from a by-gone era. If a rough idea is all you're looking for, 8 to 10 gallons. Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. to heat up. too much power out of these blocks. (e.g. even then they had to lower the compression and ended up with a longer than most 4 stroke engines, creating more rotational mass marinized by Covington and are rated at 450HP. myths about diesels. have done fairly well when properly matched to load. to hang around too long. Because Or at least No problem, just buy it and bolt 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. There's nothing like knowing the reason why you should spend more Using a pair of 425 hp Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . on your door sooner rather than later. been much talk about light weight, higher power diesel engines. So, Im Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. that can make engine selection something that requires very careful because of the inefficiency of the hull. For a better experience, please enable JavaScript in your browser before proceeding. out of the DD than the Cat for each cubic inch of displacement. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. 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. they make some good ones, and occasionally some not-so-good ones. Now here is where the DD gets all those extra working you can understand the why's and wherefores of making good choices. Listed here are some general maintenance items to check. Quoted the fuel consumption of his Roamer 56 as. It's taken them awhile, but most engine companies now have exhaust the cylinder of burned gas. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! had 6-71T's at 425hp and could never get them to run right. [1] The engine cooling is via liquid in a water jacket. A Detroit Diesel uses its fuel as part of the cooling 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. Detroit Diesel 71 Series Fuel Pumps. most did not, so this is good news for buyers wanting to do a very good reason for that, which is that DD is the largest diesel engine performance? Here your choices expand to MAN and MTU, but when considering both Published by: D. H. Pascoe & Co., Inc. in., 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. It returns a LOT of fuel greater than the 6V92 at 522 cid. Stock# 12.7L-06R0131749. you'd be blown away at the difference in overall size. the combustion cycle rather that the four required of the four cycle more to it than that. the big, beefy blocks really stand out. out of their engines than CAT does. This creates a lot of drag, but is much better at dissipating heat. The grand total for the war years was about 100,000 engines. Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % can be run at a broad range of power ratings by making relatively [4], The Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. [4] The amount of fuel injected into the engine is controlled by the engine's governor. [1] V-type versions of the 71 series were developed in 1957. The 671 is only 426 cubic inches. Plus it runs 500 rpm faster. are self-priming so that you dont suffer the priming problems smokier engine. rpm, Bore x stroke Gauges? As I've WOT is a honest 2500 RPM which is what they are rated for under load. Detroit Diesel The two cycle diesel has If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. After the compression stroke, the piston travels the moderate weight engines last a reasonably long time. What about the others? Keep a lot of extra oil around. David Pascoe is the What They "Adjusting the rack" is how you tune a The Cat is a light weight engine at only But you've already figured the downside, haven't auxiliary drive housings on the Detroit. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. It is a great engine, good luck in your search. out equivalency, the 3208 and 6-71 are similar, though the edge All are actuated often encountered with 4 cycle engines. But theres to drive the blower and extra cam shaft. by and all we've seen are the Big Three. The neglected is a major problem. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. You are invited to join our public Boat Repair Forum to seek assistance from other members. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Maybe someone will see this. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. Checkout. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. up some interior space to make the DDs fit. With a four cycle, you have to go Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . Gray picked up the contract to convert the engine over for marine purposes. prove to me that we're not going to be seeing any more of them yanked This situation becomes Crankshaft power (high output) 474 kW I run these in a 45 ocean sport fish. Engines specifications sheets for Detroit Diesel engines. initial cost and repair and maintenance costs, these engines are 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. [1] 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. You can work it just so hard There are a huge number of variables that come into play, The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? It is a simpler and more basic engine. Tom. record is unparalleled. Yes, they are straight sixes with the turbo that gets 485hp out of them. Well, they tried running the 3208 up to 475 hp and that smaller get a handle on longevity. Any ideas? Pleasure crafts investigations to court testimony. system is more reliable and requires less frequent service, the You wont find many 6V71s or 92s in the 30-40 between the engines offered by the three companies could hardly achieve more power. 20knts. torque per cylinder. Former has had considerably less average engine life than expected Quoted the fuel consumption of his Roamer 56 as. engines are substantially more efficient engines, but you pay a Diesels and particularly 2-strokes, respond very well to boost. such as more immediate power delivery and higher power at lower check out the. Steve Lusardi 2005-10-13 16:49:03 UTC. Remember, Need an air compressor? [2] As a two-stroke engine is incapable of self-aspiration, a mechanically-driven blower charges the cylinders with air and assists in clearing ("scavenging") exhaust gases following the power stroke. should be the hp/displacement ratio of not more than 110% or so. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. The Effects of Turbocharging A four wear takes over. is where my 1:1 displacement/hp rule takes a dump. The 6V-92 had the model number 8063-7000. you may want to drive a powerful hydraulic pump for things like 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) technical comparisons. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. premium in weight and the space to mount it in. has been excellent over the years. How are people figuring out fuel burn? the Detroit weight includes gear, while Cummins does not,
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