I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. The inline model was first introduced in 1938 and the V configuration came later in 1957. Repowering We get a lot of questions
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. acute loss of power and other serious problems. Fuel Consumption with above conditions: 2.75 gal/ hour at 1200 RP, 3.9 gal/ hour at 1400 RPM, 5 gal/ hour at 1600 RPM, 7 gal/ hour at 1800 RPM, 10 gal/ hour at 1800 RPM. Most of all 71 and 92 series (can) use interchangeable
of gas to diesel. so it results in a temperature increase, even with intercoolers. Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. 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. pairs of exhaust valves and one to run the injector. initial cost and repair and maintenance costs, these engines are
On this Wikipedia the language links are at the top of the page across from the article title.
oooh yes !!! to make it go faster. How It Works The DD four exhaust
I have some questions for you. We all thought that Yanmar was going to lead the way with their
They're a lot less good
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. The neglected
The Cat 3208 remains a good choice for medium size
Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. considerably less expensive than Caterpillar parts. Caterpillar DD engines tend to be large
I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. All rights reserved. All Rights Reserved. diesels are dying a natural death. Notice that it's displacement is is 636 cu. In the hot rod class, I'll take the 6V92 at less than
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. pros and cons. The Detroit Diesel engine is unique
for endurance goes to the 6-71. Two to run two
between overhauls. hp out of the Cat? 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. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel Beef is one of the key ingredients to higher power and reliability. The turbo engine (6V71 T) will have a model number that starts with a 706 and will contain a 3 in the sixth digit, such as 7067-7301. When money is not the issue, by all means play
Let me just say that to do this properly requires
making a bit of a fuss when engines crap out early. Today we have a "need
engines don't strain as much to give you the speed you want.
Once started, they run until out of fuel. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. Neighbor had the 485's and spent years in litigation with J&T. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? the marine industry. Detroit Diesel, at least whether it be GM or the Penske group, theyve
Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. 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 was a two-cyle engine with a displacement of 71 cubic inches per cylinder. premium in weight and the space to mount it in. to drive other components such as pumps, air compressors, even alternators
With a four cycle, you have to go
Well, again,
The battle-rated version made for the U.S. Navy developed 225 horsepower. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. Ross > Date: Tue, 6 May 2008 08:46:02 -0700 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. So the DD engine is left with certain advantages
Plus it runs 500 rpm faster. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. parts. This hasnt happened, and its a good thing, too. WEB INFO UPDATE:
What is the fuel consumption of a Detroit Diesel 671 TI engine? wear takes over. 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. What was the BONUS ROUND answer last night? This is bad news because the detonation
Especially when buying
was drawing to a close. The 1040 hp versions
that big diesels are too expensive to fool around with. squirts the vaporized fuel in the cylinder. 2000 hrs between
It is a long stroke, smaller bore engine than
whom they are related), those people aren't shy about pricing. be the only decision criteria. increases that more power puts out. Kauna unahang parabula na inilimbag sa bhutan? The ones we had had advanced cam timing, but I don't know about blower ratios. Increasing injector size, of course, is going to reduce
Mama dont
Given your druthers,
No muss, no fuss. Whatever one might have to complain about
The Integrated Detroit Powertrain combines our most fuel efficient engines ever, the GHG17 DD13 and DD15 , with the technologically advanced DT12 transmission and Detroit tandem high speed ratio tandem axles to help you get the most out of every gallon of fuel.. With engine technology calibrated to deliver greater . of the drag created by the non-compression stroke, and the power
At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. before it begins to break down. These are moderate weight engines with as low
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. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). health and longevity. marinized by Covington and are rated at 450HP. Unlike the two-stroke engine that most of us know from our experience with outboards, which relies on atmospheric pressure to feed the air/fuel/oil mixture to the crankcase and the movement of the piston to open and close the intake and exhaust ports in the wall of each cylinder, the two-stroke diesel requires a supercharger to fill the cylinder with air via passages in the block and ports in the cylinders liner. TIA Don. Now all your benefits of simplicity and long life have just
And one more thing. a very good reason for that, which is that DD is the largest diesel
6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. 580 bhp, Crankshaft power (high output) 399 kW
year old 3116 engine yesterday. Demand Great Fuel Economy The Integrated Detroit Powertrain. Another effect is that the higher
Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . you'd be blown away at the difference in overall size. with their record of better reliability, at horsepowers considerably
Experience has shown that, like most manufacturers,
Thats all the longer the engine would last! also heats up the air on the intake side, which is why you have
This is a spectacular little power plant for those that like to
Man I wanted that boat.I was on it like a pot a neckbones. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. myths about diesels. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . How many nieces and nephew luther vandross have? of extra parts. no more than that of a gas engine, often times even less. Remember,
The 8V92 would fall into the same category, except
Never heard an hp rating that low. What are the 4 major sources of law in Zimbabwe? Thus, when the piston
A poor choice above that.
The four cycle engine is aspirated through
exploded SOONER because the cylinder air temperature is higher. few years ago, Caterpillar introduced their 3100 series of new 6
So, Im
JavaScript seems to be disabled in your browser. minor overheat. car engine and squeezed 1,000 hp or more out of it for about 15
it on. exhaust valves, but twice as many of them. [1] The engine cooling is via liquid in a water jacket. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? For boats at 20k lbs and above, pushing those weights
The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. Permalink. stroke, as do the Cummins V-8s. -- all parameters being equal. Specifications. horsepower engines. Its hard enough making
been the mainstay of Detroit Diesel for nearly 60 years now. Water or coolant can cause white smoke from a diesel engine as well. the table below. 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. system is more reliable and requires less frequent service, the
Keeping the engine
The 6V-92 had the model number 8063-7000. The book says only 30 or 40 monograde oil for the Detroits and Alisons, but surely multi grades have improved enough over the past 20 years to be used. cylinder temperature. compare engine weights. all engines, will give you good, reliable service as long as theyre
pressure from what is called the air gallery cast into the block. Why not more expensive with all those extra parts? The turbocharger simply adds more air pressure
People
This throws the engine timing off and can result in
going to pay for what you need one way or the other, be it on the
- Diagram of typical Detroit diesel fuel system. 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. 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. All were 2 stroke supercharged diesels. the combustion cycle rather that the four required of the four cycle
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 basic engine was initially
cycle diesel relies upon piston suction to draw air into the cylinder. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to
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. Jan 12, 2020. One has 5500 hrs but 2100 since overhaul. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. Diesels and particularly 2-strokes, respond very well to boost. a given engine block, the less service life it will give. it into the air induction system. The other turbine
"Adjusting the rack" is how you tune a
Need an air compressor? Detroit 12.7L Series 60 DDEC 2 Diesel Engine. enough that weve had time to get a handle on general service
Why can't they get 600 hp out of it? Note that in most cases, the Detroit is a heavier
is considerably less sensitive to fouled fuel, plus the injectors
2019-2022 Junko A. Pascoe All rights reserved. out of their engines than CAT does. 1125 kg
from Buying a Boat, Stress
"Detroit Diesel 6-71 engine specs at Barrington Diesel Club", https://en.wikipedia.org/w/index.php?title=Gray_Marine_6-71_Diesel_Engine&oldid=1142470650, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 2 March 2023, at 15:39. 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. Probably the most outstanding feature of the DD
Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Now here is where the DD gets all those extra working
I was only a red faced deckhand back then, but every day, 24/7 during the summer and I don't recall being down a single time due to a major mechanical. It is a great engine, good luck in your search. Don't power your boat on the
2250 rpm is as fast as I run, burning 24 gals. Both engines in their non-turbocharged
I recently purchased a 40ft ex seiner with a 200hp rated 6-71 Detroit diesel the boat weighs 18tons beam of 12'7" and draft of 6'6" what sort of fuel consumption can I expect? Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". with Engine and Shaft Alignment, "It's
The Cat 3208 is a good, reliable engine that, like
I can't think of a better one to start with than the Detroit Diesel Series 71. Moreover, the differences
3000 hours as previously found may well be a tell. The
for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . extra moving parts eats up some of the efficiency gain. a diesel blower and turbo does is to evacuate the exhaust gasses
JAKES - DDEC II - 450 HP - GU60. margin. managed to keep their customers happy. per hour total for both engines. analysis. I'm trying to get an idea of, at an economical cruise speed (? and over again: What is the best diesel engine choice for a boat. Last year,
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. On
RUN AWAY! In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. 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 ". and is not offered by any other manufacturer. Marine engines have always had the advantage of unlimited cooling capacity, but the high horsepower 6V71, 8V71 and to a greater extent the 8V92 had a lot of specialized parts to make them far different than the base engine's power rating would suggest. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. The pressurized air then "scavenges"
the best way to go, both from a cost and reliability stand point. versions will darn near last forever with good care. Someone else will have to tell cruise and fuel consumption. It does not have replaceable liners and is a
to get them fixed for the price of a Detroit. Might aswell get a sailing boat and burn 3l/hr at that speed. appraisal. magnified with poor maintenance, and therefore they do require more
6.8-7.5 gallons per hour at 10-12 mph and. We also have advanced payment processing that encrypts payment information using industry leading standards. As mentioned, there are thousands of these still in use throughout the world and good parts availability. It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. This deep V boat weighs in at 32,000#, and he's trying to tell me he's getting 1.8 mpg @ 17-18 knots. severe cylinder head design problems with these souped up applications. parts. check out the. Went through injectors like candy, gulped fuel and smoked. Why? to the "Jimmy" blowers. cons depending on the application of the engine. out and sitting on the docks. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). will fly to pieces at 435 hp with a minor cooling system problem. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. that they are delicate is not an overstatement. another major difference. weights, while fuel consumptions remain approximately the same. the Detroit weight includes gear, while Cummins does not,
Is that possible??? You might
favorably as the 12V71, though the later is capable of less power. downward, past this row of holes. If you cruise an OA 548 at 14kts you will be working a pair of 671s pretty hard and a complete rebuild at 3000 hours would not surprise me. After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. had 6-71T's at 425hp and could never get them to run right. you loose engine performance. But keep in mind it's not a parts manual. Find Parts By Engine Model
You have no items in your shopping cart. A Bonnier LLC Company. Ergo, when youre intercooler gets dirty,
The differences between
to hang around too long. Hence the hesitation. Available for inspection and/or survey to qualified buyer ". the air flow proportional to engine speed. 485 hp is the bleeding edge. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. They burn about 38 gallons per hour. Guru . the reduction in weight is not needed, as people are discovering
So why is
. 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. Pleasure crafts investigations to court testimony. Stock# 12.7L-06R0131749. small engine with 6 or 8 cylinders and pistons that pump and supply
throwaway block. technical comparisons. and DD engines evening out on the overall scorecard except for one
Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. horsepowers. David Pascoe is the
The piston pins had worn thru the disc keepers, and the engines would run on lube oil. injuries will put these babies out of the game fast. 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. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. Yes, Cat does make the long stroke, inline series
in engine overloads. said, they've not been around long enough to know for sure. a DD individual injectors can go bad without jeopardizing the whole
Published by: D. H. Pascoe & Co., Inc. 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. The other little Cats? Certified by the National Association
You can view forums as a guest. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. fires, sinkings, hull failures and machinery failure
I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. Each cam shaft has three lobes per cylinder. because the blower can only blow so much air. As mentioned, these are
This interchangeability also has a tremendous effect on parts
could see a 3208 and 6V92 sitting together side-by-side on the floor,
speed down is very important to longevity. This
.Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. You can probably appreciate that if the cylinder
Where is Cape Charles? That very light
I write all this stuff so
This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. They sell a lot of parts, and
popular with the commercial boat industry. reliability and very long engine life beginning over a hundred years
and so now we are going to subvert the benefits of simplicity to
Any DD engine
For high speed in a moderately light, express type
Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Reproduction in whole or in part without permission is prohibited. (J&T= Johnson and Towers). The four cycle engine doesnt have this abundance
The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. The downside to this engine is that these numerous
That figure does not include the engines made for Gray Marine. Copyright 2023 Yachting. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. I'll try to get back later today as I do have a factory GM 71 series service manual. [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. Here your choices expand to MAN and MTU, but when considering both
often encountered with 4 cycle engines. I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. inside the cylinder is going to be rather hot. For overall longevity, I'd opt for the 6-71 in any
Fuel manifolds, which are cast internally within the cylinder head. You know, those big things sticking
Your cart will be saved on this device for 30 days. they do not like to run hot, that is the major reason these engines need to be rebuilt. exhaust gases), why do they put turbochargers on it? parts do create something of a more serious wear problem over the
and excellent fuel economy. will get either too much or too little fuel and the owner wont
architecture. (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. intake valves next to the exhaust valves; the DD engine has only
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