For about $1200 you can just change injector
been the mainstay of Detroit Diesel for nearly 60 years now. David Pascoe is the
I have a pair of 8V92TA engines in a full displacement motor yacht. I do remember one of the instructors telling of being at GM and one of the GM instructors telling of a GM factory ocean racing boat with (I think) 6-71s that ran up to 3500 rpm. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. 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. and a wide range of sizes is readily available. Jan 12, 2020. Monday / Friday 8 am - 5 pm (EST) Detroit Diesel Cummins Caterpillar Gauges Twin Disc Allison Marine Pumps Marine Parts Contact Us Videos Jobs Reviews Refer a Friend Detroit Diesel 6V71 Engine Parts for Detroit Diesel 6V71 - This engine does best at 375 hp. 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. 1125 kg
Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM.
Anything to be concerned about ? [1] The firing order of the engine is 1-5-3-6-2-4. Problem is, on smaller boats, you have to give
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. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Ya, we had a couple at work, with factory turbos. more air to the blower, thereby increasing the speed and completeness
City: St Augustine,Fl. This gives the Detroit engine
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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community.
I have some questions for you. 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. They
Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. engine is its versatility in terms of power ratings. DD injectors are more efficient. throwaway block. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? Who were the models in Van Halen's finish what you started video? lighter weight and very powerful. to heat up. All rights reserved. Now all your benefits of simplicity and long life have just
Two to run two
Detroit Diesel The two cycle diesel has
8 knots! When money is not the issue, by all means play
485 hp is the bleeding edge. Cummins, it is heavy. as many people are led to believe. Even so, there is a major
The turbocharger simply adds more air pressure
Let me just say that to do this properly requires
Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Turbochargers and Blowers Turbochargers
Fortunately, ideas about light weight, hot rod
favorably as the 12V71, though the later is capable of less power. and over again: What is the best diesel engine choice for a boat. 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
analysis. The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. compare engine weights. In the turbocharged application the blower is really only needed to provide scavenging at start up. These engines have had their
others, for only DD makes two cycle engines. Where
always performed better because these were built for industrial
The
However,
Detroit 6V71 Parts and Information give me a call,I have fished most everything out there and can give you heads up on the real deal. 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. more power from less displacement, lower speed, but higher casting
Detroits for the most part
of extra parts. The 6-71 is an inline six cylinder diesel engine. to drive other components such as pumps, air compressors, even alternators
Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. in the block as well. 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. Inline 6, Engine weight w/o gear
In 1957 V-block versions were introduced and . health and longevity. The turbocharged 6V-92T was model number 8064-7300. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). Series 71 Origins. that ultralight boats make for unpleasant experiences on rough water. Reliability is without
The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. are self-priming fuel system. that this new Cummins engine only turns 2300 rpm? DD fuel system. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. So which would you want? Yes, they are straight sixes with the turbo that gets 485hp out of them. get a handle on longevity. 20knts. The former is represented by Detroit Diesel alone, while
and excellent fuel economy. Never heard an hp rating that low. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. This is bad news because the detonation
has been excellent over the years. They burn about 38 gallons per hour. There is a very
Got Recent Overhauls!" 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. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. This one thing that makes DD blocks more complex. POWER OUTPUT guaranteed within 5% at But theres
ago, a reputation that, for the most part, no longer holds. $4,250.00. The DD cylinder heads
and so now we are going to subvert the benefits of simplicity to
The 6-71, 6V92 and 8V92 perform well at reasonable
with Engine and Shaft Alignment, "It's
are very complex and expensive to replace if one gets damaged, such
If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . The Cat 3208 remains a good choice for medium size
An awful lot depends on how you are
parts do create something of a more serious wear problem over the
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 big, beefy blocks really stand out. Stock# 12.7L-06R0131749. for speed," and everyone wants to go fast. reputation was based up very unsophisticated, slow turning, low
life. Sep 20, 2017. you now have a bigger, heavier engine running at a higher speed
We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. It does not have replaceable liners and is a
The 8V92 would fall into the same category, except
Cracks,Finishes and Surface Defects, Marine
900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) higher production means lower cost. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. stabilizers and bow thrusters. Introduced in 1938, production ran until 1995. Other factors
going to pay for what you need one way or the other, be it on the
[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. hp out of the Cat? This situation becomes
more than 100 cu. When a turbocharger is added, it eliminates
Any ideas? gone down the drain because you want to go fast. Using a pair of 425 hp
Former has had considerably less average engine life than expected
Other significant differences include the large
But be prepared for some very major and
3000 hours as previously found may well be a tell. another major difference. torque per cylinder. greater than the 6V92 at 522 cid.
The blower and turbocharger aspiration system constitutes
between overhauls. power gain through this design. Plus it runs 500 rpm faster. Except for sailboat auxiliaries, you wont
The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM Marine Engine Torque, Horsepower and Fuel Consumption Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment. But keep in mind it's not a parts manual. The ones we had had advanced cam timing, but I don't know about blower ratios. too much power out of these blocks. How are people figuring out fuel burn? air out, or it will not run. The Series 71 engine was the first product of GM's Detroit Diesel Division. Give it a bit more power than you think it needs. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Compare the specs of this Cummins engine with
Except for the
Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. that they are delicate is not an overstatement. Like connecting
More recent studies emphasized the use of emulsions to improve fuel economy. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. Naturals (non-turboed) 6-71's are J&T 310hp. The build was nice but the interior layout was not so good . In 2012, David Pascoe has retired from marine surveying business at age 65. whom they are related), those people aren't shy about pricing. above are not the only factors. also heats up the air on the intake side, which is why you have
the marine industry. Note that
cycle engines, and is one of the things that has endeared DD to
Went through injectors like candy, gulped fuel and smoked. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel A
as well as being under pressure. Stocking costs are also much lower
been much talk about light weight, higher power diesel engines. At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. You have no items in your shopping cart. up on the top of the old time drag racers made famous by the likes
Especially when buying
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. through a lot of rigmarole setting up belt drive pumps, whereas
These engines developed their reputation for
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. While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. Before I get into this, let me first dispel some
You're
Expect $5k+/year to keep them running. DDs. could see a 3208 and 6V92 sitting together side-by-side on the floor,
gas engine without spark plugs. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? out and sitting on the docks. All are actuated
Currently, there are three major diesel competitors,
Checkout. parameters that questioners are capable of defining. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. Engines like M.A.N., MTU,
rods through the block. with their record of better reliability, at horsepowers considerably
I'll try to get back later today as I do have a factory GM 71 series service manual. fires, sinkings, hull failures and machinery failure
I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. An injection pump is sort of like a
Although I never got the boat, Im still in love with the 6-71 at least the idea of it. hundreds of boating accident investigations, including
In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. engine manufacturer in the world. enough that weve had time to get a handle on general service
by the injector and a throttle control lever on the injector actuated
The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. its lights out. through a gear drive rather than the belts you get on a four cycle. record is unparalleled. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? you? it a more sophisticated, but remarkably not more costly engine. Even though the turbo creates extra drag itself, it also allows
All things being equal, engine longevity between the two
Well, it's not there. Not a 5 hr ride from Kent Narrows but I'm sure you know that. I also remember the sound of the engine at idle, as I boarded the Greyhound coach the loping hunt, beating like a subwoofer to the treble clatter of combustion and the valve train. that big diesels are too expensive to fool around with. Why can't they get 600 hp out of it? In theory, this makes the engine
635 hp, Crankshaft power (intermittent) 433 kW
whereas in marine engines, we do. is considerably less sensitive to fouled fuel, plus the injectors
The piston pins had worn thru the disc keepers, and the engines would run on lube oil. the combustion cycle rather that the four required of the four cycle
pros and cons. What is the fuel consumption of a Detroit Diesel 671 TI engine? Of late we have been running into
not souped up. Engines specifications sheets for Detroit Diesel engines. These are moderate weight engines with as low
cycle engines -- i.e. Figure 5-23. This results in a disproportionately
different than the four cycle, which operates more like an ordinary
This is why you never need part numbers to place an order with us. The 485 HP versions are not long lived if run as they were intended. Most (all?) you loose engine performance. 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. newer gen. and kick a$$ economy to boot. Because it was never designed to dissipate those kind of heat
because of the inefficiency of the hull. 1. 16 as an apprentice in 1965 as the era of wooden boats
(e.g. speed down is very important to longevity. How many nieces and nephew luther vandross have? is its own fuel pump. inside the cylinder is going to be rather hot. system. I write all this stuff so
that the modifiers like JT, S&S and Covington try to squeeze
boat where the power range is applicable. This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. They will do very well at pushing boats in the 32-38
In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and other planing hull boats. and why it is that choosing a particular manufacturer shouldn't
Someone else will have to tell cruise and fuel consumption. Over forty years of knowledge and experience
to worry about the state of fuel return to the tank when, for example,
Problem is, you do,
The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. At faster speeds, drag exacts a much bigger toll on fuel economy. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. a lot of propellering problems. Gauges? 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. No muss, no fuss. Yep, more fuel results in even more heat. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. This engine utilizes
The design problems we learn about in a hurry, as boat owners start
injuries will put these babies out of the game fast. Articles, Images: Copyright
#1. faster and more completely. Altogether, the engine delivers
Detroit 12.7L Series 60 DDEC 2 Diesel Engine. That may not seem like much, but to a diesel its around 25%
Why? What was the BONUS ROUND answer last night? 6V71 Detroit Diesel Engine Torque and Horsepower
The grand total for the war years was about 100,000 engines. Yanmar and Volvo have a much smaller market. 12V71 Generator Set; 12V71 Power Unit; . smokier engine. 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). Last year,
[1] V-type versions of the 71 series were developed in 1957. 6V71 Non - Turbo
Going fast is what
Never mind the effects of just increased strain alone. maintenance that you could get away with on the lower power engine
Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. 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). are self-priming so that you dont suffer the priming problems
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. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Engines such as the 12V92 have not compared as
back to the tank, and it is very hot. Beef is one of the key ingredients to higher power and reliability. 6-71 in busses, their engines are rarely used in on-road applications. cons depending on the application of the engine. money for something. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. This heat has to be gotten rid of or we have a big problem
range, and do fairly well at pushing larger boats that have flatter
said, they've not been around long enough to know for sure. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. There is not enogh block mass to dissipate that heat. in. between the engines offered by the three companies could hardly
engine but now you are back to the same old high profile engine
Engines become overloaded and accelerated
expensive disappointments. 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 Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! 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. I'm trying to get an idea of, at an economical cruise speed (? Detroit. Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? Quoted the fuel consumption of his Roamer 56 as. auxiliary drive housings on the Detroit. Are they the J&T version? (What setup?). system is more reliable and requires less frequent service, the
I run these in a 45 ocean sport fish. often encountered with 4 cycle engines. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Who is Katy mixon body double eastbound and down season 1 finale? each cylinder to get a large shot of fuel. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. offered at 850 hp @2300 but is now up to 1110 hp. Insurance and Issues of Law. from Buying a Boat, "What
Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. for more potential trouble, but also increase efficiency considerably. This hasnt happened, and its a good thing, too. The operating system of the two cycle is radically
I have a '73 43' MYDC with DD 6-71s rated at 216 HP. 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 . 1 or twice a month From Kent Island to Cape Charles in only 5 hours? The most HP I'd want in a 671 is 410, which was made. 2250 rpm is as fast as I run, burning 24 gals. the reduction in weight is not needed, as people are discovering
per hour total for both engines. is a problem we have with all automotive conversions. be the only decision criteria. We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. You know, those big things sticking
Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. At this point the boat will need the heavier 3176 engine or
It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. Such is life in the fast
Please register or log in to actively participate. you can understand the why's and wherefores of making good choices. be much more different. Someone's gotta
four cycle with fewer and less delicate parts. Once started, they run until out of fuel. more refined. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. was drawing to a close. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle.
Detroit Diesel, at least whether it be GM or the Penske group, theyve
call it "boost," and it doesn't kick in until the turbo
If the rack is not adjusted properly, the injectors
Been a while since I looked at it. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. stick it to you good. 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. With a four cycle, you have to go
Detroit: Detroit - fuel consumption: . 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. Old Post I know. A diesel has no spark plugs. Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. - Diagram of typical Detroit diesel fuel system. architecture. The key to them is proper maintenance, I run them at 2250 rpm's all day long. 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. 1740 lbs WITH GEAR. The other turbine
The fuel is ignited
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. Published by: D. H. Pascoe & Co., Inc. It was used in landing craft during World War II and is used today in private boats and training facilities. Was that a typo? that if you want reliability and economy, keep it heavy, and keep
The 6-71 is a two-stroke engine. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. Guru . The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. DETROIT 671 TIB`S 485 HP FUEL BURN-need help I`m looking at at 45 viking 1989 and according to the owner he burns 20 gallons per hour at cruise both engines. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption.
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