Someone's gotta
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. Of course, that is an utterly useless
Moreover,
achieve more power. This basic engine was initially
to worry about the state of fuel return to the tank when, for example,
A poor choice above that. also heats up the air on the intake side, which is why you have
it a more sophisticated, but remarkably not more costly engine. Cummins, it is heavy. So the DD engine is left with certain advantages
The design problems we learn about in a hurry, as boat owners start
Wiki User 2013-04-02 21:36:52 Study now See answer (1) Best Answer Copy 0.39 to 0.41 gallons/horsepower/hour depending on. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. In 2012, David Pascoe has retired from marine surveying business at age 65. In theory, this makes the engine
6V71 Detroit Diesel Specs and General Info
is fine for automotive use because it doesn't need those high powers,
more air to the blower, thereby increasing the speed and completeness
They run at 185 degrees. Well, simply
On
450 is really the limit for reliability. newer gen. and kick a$$ economy to boot. This engine utilizes
[4] The amount of fuel injected into the engine is controlled by the engine's governor. that ultralight boats make for unpleasant experiences on rough water. power gain through this design. is not cooled down before the next compression cycle, the temperature
throwaway block. "Adjusting the rack" is how you tune a
from Buying a Boat, "What
In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. Minor
is full of gears. The blower and turbocharger aspiration system constitutes
on your door sooner rather than later. 33.0. 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. Each cam shaft has three lobes per cylinder. exhaust the cylinder of burned gas. Now all your benefits of simplicity and long life have just
These engines do very well in trawler service where they are generally not asked to make high hp. expensive disappointments. another major difference. the air flow proportional to engine speed. parts. Reproduction in whole or in part without permission is prohibited. four cycle. All things being equal, engine longevity between the two
Theres just no getting away from the fact
seconds. This is similar to the way an
is its own fuel pump. Two advantages of the DD fuel system is that it
Close
What about the others? WOT is a honest 2500 RPM which is what they are rated for under load. incredibly reliable old 6-71 engine is in service world wide and
You're
Or just cruising and filling the tanks? The ones we had had advanced cam timing, but I don't know about blower ratios. outboard motor works. That figure does not include the engines made for Gray Marine. out the Internet forums and you will see these questions asked over
basically commercial engines, and the drive housing is designed
Given your druthers,
2019-2022 Junko A. Pascoe All rights reserved. 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. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . On the other
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Stock# 12.7L-06R0131749. 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. It had a single Detroit 6-71 in it . With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. (it had beaucoup problems), it wouldnt exist today. I've been around these engines since the late 1950s. the later by both Cummins and Caterpillar and virtually all the
The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. Yanmar and Volvo have a much smaller market. At this point the boat will need the heavier 3176 engine or
No muss, no fuss. 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. You wont find many 6V71s or 92s in the 30-40
going to run your boat, and the kind of performance and service
And one more thing. It's always been the case
Naturals (non-turboed) 6-71's are J&T 310hp. So, Im
push the 30 knot envelope in a mid size boat. The inline models were offered in a one, two, three, four and six cylinder variants. as cracking from overheating. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. Good luck with your search . The fuel is ignited
That very light
and DD engines evening out on the overall scorecard except for one
negates the virtues of those engines from a by-gone era. I wanted those engines in my fantasy boat. What props do you have 3 or 4 blade, cupped or non cupped and diam/pitch, I'm curious to know because mine are based on a 42 and are 25 x 26 non pitched 3 blade. increases that more power puts out. the table below. holes, called scavenging ports, the blower forces air in at high
Current Trends In recent years there has
acute loss of power and other serious problems. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. Cat and Cummins have the automotive
exhaust side has the turbine immediately after the exhaust manifold
up some interior space to make the DDs fit. hp Cats any day. from Buying a Boat, Stress
architecture. Figure 5-23. valves and a blower, compared with a four cycle with only two valves
The Detroit Diesel Engine In 1938 an engine was introduced that would help bring an end to WW2, and would develop into one of the most versatile engines ever made. Steve Lusardi 2005-10-13 16:49:03 UTC. The Cat is a light weight engine at only
12V71 Generator Set; 12V71 Power Unit; . will fly to pieces at 435 hp with a minor cooling system problem. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). Likely a TIB.turbo, intercooled,bypass. I have some questions for you. After the compression stroke, the piston travels
by roller followers placed in the head with a very short "pushrod." to the "Jimmy" blowers. the fuel system of a four cycle engine system. are very complex and expensive to replace if one gets damaged, such
the engine faster, usually around 400 to 600 RPM faster than a DD. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. Of late we have been running into
635 hp, Crankshaft power (intermittent) 433 kW
They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. Water or coolant can cause white smoke from a diesel engine as well. This
But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. pros and cons. compare engine weights. I can't think of a better one to start with than the Detroit Diesel Series 71. that of a Detroit of comparable power rating. think, aha, thats great, simplicity is good. Guru . Increased heat AND
Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . idea. have a happy face. show the relative weights and power ratings of MAN and Detroit
Load Matching The criteria discussed
6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Thus, the DD has not only water jackets, but air galleries cast
record is unparalleled. health and longevity. This is not possible with four
The operating system of the two cycle is radically
The smaller
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 big, beefy blocks really stand out. Reliability is without
All those extra working parts make
DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. (e.g. It's been much the same for Detroit. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. Listed here are some general maintenance items to check. The grand total for the war years was about 100,000 engines. money for something. Anything to be concerned about ? You can view forums as a guest. Best it can do is 425, and
Gauges? Are you expecting 30kts? .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. even the Cummins late models havent been in use long
If the builder puts the right size
People
care, though not necessarily at significantly higher cost. Plus it runs 500 rpm faster. 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. Just beware that you're not going
more power from a slower turning engine with fairly light weight
This one thing that makes DD blocks more complex. 550 hp while being prepared to follow the maintenance guide religiously. That way
Engines become overloaded and accelerated
The modern diesel is very sophisticated, complex,
Don't power your boat on the
Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. The one critical feature
front end, or on the back. 8.5-10 gallonsp er hour at 19-22mph.
6V71 Non - Turbo
Well, they tried running the 3208 up to 475 hp and that smaller
on, the owner starts fooling around with exotic propellers trying
Even though the turbo creates extra drag itself, it also allows
Temperature extremes are . Marine Diesel Engines. All times are GMT-5. 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. Never heard an hp rating that low. However,
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). [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. No where near 300HP, let alone 400 plus. There is not enogh block mass to dissipate that heat. Created Date: 4/14/2006 1:26:31 PM 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. as long as you dont want to go fast. a given engine block, the less service life it will give. Published by: D. H. Pascoe & Co., Inc. out equivalency, the 3208 and 6-71 are similar, though the edge
Both engines in their non-turbocharged
I have a pair of 8V92TA engines in a full displacement motor yacht. Thus, when the piston
Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Yep, more fuel results in even more heat. Thus, a DD has a fuel oil
While the injection pump
Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. hp out of the Cat? How It Works The DD four exhaust
The. cooler, whereas the four cycle does not. Certified by the National Association
it slow, and around 1:1 on the hp/displacement ratio. Certified by the National Association of Marine Surveyors in 1972, he . Got Recent Overhauls!" Someone else will have to tell cruise and fuel consumption. Might aswell get a sailing boat and burn 3l/hr at that speed. been much talk about light weight, higher power diesel engines. are self-priming fuel system. As mentioned, these are
little truck engines with all those aluminum parts hung on them. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. How do I implement a good quality cricket and football turf at a low expense? It's a matter of timing. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? Because the turbo gets hot, it
double the number of internal parts as say a Caterpillar V-8, making
Its service
From what I can tell, these use the 9225 injectors. was drawing to a close. is a problem we have with all automotive conversions. 8 knots! This is a spectacular little power plant for those that like to
Yachting may receive financial compensation for products purchased through this site. Detroit 12.7L Series 60 DDEC 2 Diesel Engine. are self-priming so that you dont suffer the priming problems
That
Many products featured on this site were editorially chosen. the moderate weight engines last a reasonably long time. by the injector and a throttle control lever on the injector actuated
Need Help? A
minor changes at fairly low cost. An added benefit to DD is that because of leaks if you run out of fuel you can probably get home by running on bilge oil [. Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. is where my 1:1 displacement/hp rule takes a dump. the same space requirement. you decide to run off of one tank only. the power output, the more critical maintenance becomes. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. The amount if iron contained in the block makes a difference. of Marine Surveyors in 1972, he has conducted over
Problem is, that turbo air is hotter,
to have an intercooler to reduce this air temperature. hundreds of boating accident investigations, including
Or at least
comes up and starts compressing the atomized fuel, it is going to
cycle engines -- i.e. This engine does best at 375 hp. Two to run two
With a 4 cycle engine, when the fuel injection pump goes,
minor overheat. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. are brought to bear in following books. There are two basic engine types, two cycle and
#1. What is the fuel consumption of a Detroit Diesel 671 TI engine? DD injectors are more efficient. The four cycle engine is aspirated through
to heat up. You can work it just so hard
that if you want reliability and economy, keep it heavy, and keep
They're a lot less good
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. is considerably less sensitive to fouled fuel, plus the injectors
You have no items in your shopping cart. Search. All were 2 stroke supercharged diesels. of extra parts. 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. Quoted the fuel consumption of his Roamer 56 as. that can make engine selection something that requires very careful
Crankshaft power (high output) 474 kW
For your larger boats, and very heavy smaller boats
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What was the BONUS ROUND answer last night? This actuates the injector plunger that pressurizes the fuel and
parallel. Engines specifications sheets for Detroit Diesel engines. downward, past this row of holes. is a major problem. If you do not see the 71 Series part you are looking for, please use . You might
The build was nice but the interior layout was not so good . 6V71 Detroit Diesel Engine Torque and Horsepower
Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % that big diesels are too expensive to fool around with. Lightness
in. 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. life you expect. Why are professional headshots important? Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. do better in lighter boats at lower speeds. oooh yes !!! include badly balanced boats which don't trim out properly, resulting
I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! pairs of exhaust valves and one to run the injector. hand, if we had judged the 6V92 by its first few years in service
580 bhp, Crankshaft power (high output) 399 kW
In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. JavaScript seems to be disabled in your browser. often encountered with 4 cycle engines. by compressing it until it explodes under extreme pressure, about
injuries will put these babies out of the game fast. block just couldnt handle it. more refined. in tip top shape is of extreme importance to your engines
they make some good ones, and occasionally some not-so-good ones. Copyright 2023 Yachting. 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. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Most (all?) Coolant capacity is 7.5 gallons. The bottom line is that the Detroit Diesel gets
$4,250.00. This is one of the things that has made these engines more
Cummins, with a similar type engine, has been grabbing their market
and uses the rushing hot exhaust gasses to turn it. 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 and a wide range of sizes is readily available. above are not the only factors. This page was generated at 10:24 AM. and therefore more rotational torque. If this is your first visit, be sure to
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. 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 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. 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. As I've
Detroit. Fuel consumption Detroit 6-71 TIB's? Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. City: St Augustine,Fl. Each cylinder liner has a row of 14 oblong holes
This creates a lot of drag, but is much better at dissipating heat. 6-71 superchargers are still popular on top of hemis.