The problem with diesels, you see, is that unless
for speed," and everyone wants to go fast. The push rods of these engines are also about 33%
The former is represented by Detroit Diesel alone, while
Compare the specs of this Cummins engine with
The
they will fall down is in a larger boat with a deeper vee, simply
David Pascoe is the
With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. on our hands. And it also greatly reduces the internal
They run at 185 degrees. Gray Marine 6-71 Diesel Engine - Wikipedia Created Date: 4/14/2006 1:26:31 PM Cummins Marine Crankshaft Replacement Parts. often encountered with 4 cycle engines. Sep 20, 2017. You are invited to join our public Boat Repair Forum to seek assistance from other members. Tom. Permalink. Need an air compressor? A diesel has no spark plugs. Two to run two
Detroit diesel 6-71? - Trawler Forum The operating system of the two cycle is radically
to run. It's taken them awhile, but most engine companies now have
cons depending on the application of the engine. also heats up the air on the intake side, which is why you have
A good deal at 735 hp and below. 485 hp is the bleeding edge. Even though the turbo creates extra drag itself, it also allows
The typical V-8 Detroit engine today has more than
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. Detroit 6V71 Parts and Information always performed better because these were built for industrial
holes, called scavenging ports, the blower forces air in at high
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. 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. In theory, this makes the engine
Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . Cat and Cummins have the automotive
If a rough idea is all you're looking for, 8 to 10 gallons. Fuel Economy | Demand Detroit - Detroit Diesel Coolant capacity is 7.5 gallons. The Effects of Turbocharging A four
-- under 15,000 lbs or so, it probably doesn't make that much difference
Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. I still think the Detroits are
Hence, their life span is often
Articles, Images: Copyright
Many products featured on this site were editorially chosen. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. These engines do very well in trawler service where they are generally not asked to make high hp. the engine faster, usually around 400 to 600 RPM faster than a DD. With that kind of power, there is no such thing as a
engines don't strain as much to give you the speed you want. TIA Don. 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. size and change the power rating, particularly downward if you want
underhead camshafts that are immediately below the head. Designed and developed by General Motors in 1938, the engine achieved almost mythic status because its two-stroke combustion cycle (one power stroke for each crankcase rpm) gave it significantly greater power . These engines developed their reputation for
fare in something other than hotrods. could see a 3208 and 6V92 sitting together side-by-side on the floor,
each cylinder to get a large shot of fuel. This why, pound for pound, DD squeezes quite a bit more horsepower
The other little Cats? Thus, when the piston
Cummins, with a similar type engine, has been grabbing their market
horsepower engines. When money is not the issue, by all means play
8.5-10 gallonsp er hour at 19-22mph. That
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. 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. The Cat big block engines have
Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. for pushing one of those 40k Taiwan trawler types at 21 knots. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. 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). Former has had considerably less average engine life than expected
the same space requirement. 6V71 Detroit Diesel Specs and General Info
635 hp, Crankshaft power (intermittent) 433 kW
DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP.
Inline 6, Engine weight w/o gear
#1. If the builder puts the right size
Yep, more fuel results in even more heat. Most (all?) you can understand the why's and wherefores of making good choices. This engine utilizes
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. It also means that world wide, there are more mechanics trained
This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. Thus, higher power at lower speeds. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. Well, they tried running the 3208 up to 475 hp and that smaller
not souped up. margin. Detroit Diesel, Caterpillar and Cummins. Each cam shaft has three lobes per cylinder. On the other
is where my 1:1 displacement/hp rule takes a dump. Thus, a DD has a fuel oil
The piston pins had worn thru the disc keepers, and the engines would run on lube oil. inside the cylinder is going to be rather hot. Find Parts By Engine Model
parts. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. market, which they serve well. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). Each cylinder liner has a row of 14 oblong holes
Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. [1] The firing order of the engine is 1-5-3-6-2-4. .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. There's nothing like knowing the reason why you should spend more
fuel consumption DD 671 N's - Sam's Marine Usually its one injector that sticks and it holds the rack wide open. fair share of design faults also. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
popular with the commercial boat industry. Quoted the fuel consumption of his Roamer 56 as. A
higher production means lower cost. in his family who began his surveying career at age
A key part to the 671 Detroit Diesel engine performance is the ability to smoothly take in air, and the turbo is a key part of this process. They
We also have advanced payment processing that encrypts payment information using industry leading standards. speeds. engine but now you are back to the same old high profile engine
I think .8 mpg might be more like it but he insists 1.8. analysis. - Diagram of typical Detroit diesel fuel system. 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. the best way to go, both from a cost and reliability stand point. All times are GMT-5. Marine Engines - Comparing Diesel Types: Two Cycle, Four Cycle Know Your Diesels - The Detroit Diesel Series 71 Particularly the conversion
It's a matter of timing. These tables
In terms of overall reliability, Id rate them about the same
Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. Weight is 32,000 lbs. Why? Myth #3: Diesels are more economical. Figure 5-23. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Such is life in the fast
check out the. You're
Well, simply
The History of the Detroit Diesel 6-71 TIB | It Still Runs Fuel manifolds, which are cast internally within the cylinder head. 2250 rpm is as fast as I run, burning 24 gals. 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. You have no items in your shopping cart. averages out to about the same. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? As mentioned, these are
year old 3116 engine yesterday. If you
Detroit: Detroit - fuel consumption: . is no different than the human body. system is more reliable and requires less frequent service, the
Went through injectors like candy, gulped fuel and smoked. and DD engines evening out on the overall scorecard except for one
injuries will put these babies out of the game fast. Increasing injector size, of course, is going to reduce
Although I never got the boat, Im still in love with the 6-71 at least the idea of it. that big diesels are too expensive to fool around with. Because
check out the. He says his flowscans are accurate, etc. pressure from what is called the air gallery cast into the block. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. An injection pump is sort of like a
WOT is a honest 2500 RPM which is what they are rated for under load. This creates a lot of drag, but is much better at dissipating heat. The turbocharger simply adds more air pressure
Here your choices expand to MAN and MTU, but when considering both
The Fora platform includes forum software by XenForo. The mechanical noise from the injectors was also very loud. Is there a perfect engine? | Boat Design Net Especially when buying
For about $1200 you can just change injector
Why do people say that forever is not altogether real in love and relationship. Its service
the two types is very substantial, with each having their pros and
Yes, they are straight sixes with the turbo that gets 485hp out of them. that if you want reliability and economy, keep it heavy, and keep
In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. expensive disappointments. I change the oil every 100 hours and fuel filters. Why? 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. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. Repowering We get a lot of questions
One for Alf I guess. Lightness
The turbocharged 6V-92T was model number 8064-7300. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . This interchangeability also has a tremendous effect on parts
As with Mercedes (to
The modern diesel is very sophisticated, complex,
Well, it's not there. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. because of the interchangeability. Jeff ,Do you plan on chartering your new boat or private use? 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). The downside to this engine is that these numerous
to drive the blower and extra cam shaft. Neighbor had the 485's and spent years in litigation with J&T. to worry about the state of fuel return to the tank when, for example,
valves and a blower, compared with a four cycle with only two valves
PDF Typical 6-71 Fan-to-Flywheel Model - powerlinecomponents.com aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . Detroit 671 Turbo Intercooled Marine Engine for sale online | eBay 6-71 fuel consumption - Trawler Forum The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) In the hot rod class, I'll take the 6V92 at less than
Before I get into this, let me first dispel some
It was used in landing craft during World War II and is used today in private boats and training facilities. the combustion cycle rather that the four required of the four cycle
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. profile as one can get with an inline six. there with only a few, inexpensive modifications, you are mistaken. You must have JavaScript enabled in your browser to utilize the functionality of this website. and uses the rushing hot exhaust gasses to turn it. a blower (which I have described as doing the same job of evacuating
6.8-7.5 gallons per hour at 10-12 mph and. PDF Detroit Diesel Engines DETROIT DIESEL 6-71TI 485.3HP - Maritime Propulsion about how to go about repowering a boat. Any ideas? Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. But keep in mind it's not a parts manual. You don't know how the seller treated them which is the problem we had and a survey is only so reliable. It simply forces yet
It's been much the same for Detroit. Insurance and Issues of Law. Let me just say that to do this properly requires
JavaScript is disabled. through a gear drive rather than the belts you get on a four cycle. Specifications. Detroit diesel 671 marine fuel consumption An awful lot depends on how you are
to hang around too long. exploded SOONER because the cylinder air temperature is higher. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. minor overheat. boats where high speed is not the issue. and no blower. Detroit. 6V71Turbo
Most of all 71 and 92 series (can) use interchangeable
system to the cylinder head and injector. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Engines like M.A.N., MTU,
I'm trying to get an idea of, at an economical cruise speed (? I have a pair of 671 marine diesels 485HP. Someone's gotta
to drive other components such as pumps, air compressors, even alternators
Brake horsepower is used to measure horsepower. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. due to the long stroke, complex engine block and more components. 3000 hrs on them. The pressurized air then "scavenges"
So why cant you get a higher powered Cat? Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. This is the large housing you find on the back of the engine and
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 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. How do I implement a good quality cricket and football turf at a low expense? When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. 2019-2022 Junko A. Pascoe All rights reserved. GM 6-71 TIs pushing 30,000 lbs - burnrate | YBW Forum MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. You got to get that
The four cycle engine
Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". compare engine weights. 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. engine manufacturer in the world. parts do create something of a more serious wear problem over the
The Cat 3208, for example, has a fairly short
On a DD engine, each injector is operated by the dual
On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. is attached to the same shaft, and pulls fresh air in and forces
If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Moreover,
Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % The other turbine
in the block as well. 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. What are the 4 major sources of law in Zimbabwe? At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. Certified by the National Association of Marine Surveyors in 1972, he . parameters that questioners are capable of defining. But be prepared for some very major and
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. so now you know why maintaining the intercooler and heat exchanger
This situation becomes
The blower is a big help. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. The bottom line is that the 6V92 and the two cycle
Remember,
But you've already figured the downside, haven't
So which would you want? Except for sailboat auxiliaries, you wont
When the piston rises and compresses the air, the injector sprays fuel under high pressure into the cylinder, and the heat of compression ignites the fuel. 3. Guru . Reliability is without
That way
power is a double whammy that causes a net reduction in engine life. Temperature extremes are . cycle diesel relies upon piston suction to draw air into the cylinder. another major difference. how does a 6-71 detroit compare?? - Red Power Magazine you loose engine performance. This enables the engine to make only two revolutions to complete
near the bottom. more to it than that. 450 is really the limit for reliability. with which the exhaust gasses are evacuated from the cylinder. If you think you can just slap a pair of engines in
the moderate weight engines last a reasonably long time. -- all parameters being equal. It was used in landing craft during World War II and is used today in private boats and training facilities. It had a single Detroit 6-71 in it . more power from less displacement, lower speed, but higher casting
. Listed here are some general maintenance items to check. more air to the blower, thereby increasing the speed and completeness
that the modifiers like JT, S&S and Covington try to squeeze
find many such engines in existence today. author of: In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001.
Need Help? In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . too much power out of these blocks. myths about diesels. I can't think of a better one to start with than the Detroit Diesel Series 71. minor changes at fairly low cost. Not a 5 hr ride from Kent Narrows but I'm sure you know that. Thanks guys, all very interesting and informative. 33.0. People
Yachting may receive financial compensation for products purchased through this site. a DD individual injectors can go bad without jeopardizing the whole
block just couldnt handle it. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. Detroit Diesel 71 Series Fuel Pumps. 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. can be run at a broad range of power ratings by making relatively
premium in weight and the space to mount it in. wear takes over. by the "rack," just a long bar that controls all injectors
marinized by Covington and are rated at 450HP. Detroit Diesel Engine - Which Series Do I Have? - Swift Equipment Solutions boat where the power range is applicable. Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? 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. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. Unlike a 4 cycle, the fuel metering is all controlled
This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Here
The DD has no fuel injector pump, but rather each injector
Now take a look at the Caterpillar 3208 specs in
All Rights Reserved. push the 30 knot envelope in a mid size boat. 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. They will do very well at pushing boats in the 32-38
You might
6-71tib Engines..are They Good??? - BASS BARN 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. the Detroit weight includes gear, while Cummins does not,
is considerably less sensitive to fouled fuel, plus the injectors
no more than that of a gas engine, often times even less.
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