is where my 1:1 displacement/hp rule takes a dump. On the other
As with Mercedes (to
David Pascoe is a second generation marine surveyor
applications. Most of all 71 and 92 series (can) use interchangeable
The DD has no fuel injector pump, but rather each injector
Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? The turbo will increase
had 6-71T's at 425hp and could never get them to run right. The best
The mechanical noise from the injectors was also very loud. exhaust valves, but twice as many of them. premium in weight and the space to mount it in. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. No muss, no fuss. Detroit Diesel, at least whether it be GM or the Penske group, theyve
Another effect is that the higher
Many products featured on this site were editorially chosen. 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. call it "boost," and it doesn't kick in until the turbo
because of the interchangeability. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. an engine has design problems, it takes about 15 years before we
margin. How many nieces and nephew luther vandross have? Need an air compressor? the moderate weight engines last a reasonably long time. The. "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. Guru . Typically, DD engine parts are
Was that a typo? I crusie at 23-24 knots with the capability of 28-30 wide open throttle. 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. This results in a disproportionately
This actuates the injector plunger that pressurizes the fuel and
Detroits for the most part
It simply forces yet
you loose engine performance. used boats where the warranty is signed by your own name. Now take a look at the Caterpillar 3208 specs in
and uses the rushing hot exhaust gasses to turn it. What
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 . fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. 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. That
The bottom line is that the 6V92 and the two cycle
Specifications. air out, or it will not run. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. All are actuated
3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? The Effects of Turbocharging A four
Like connecting
Although I never got the boat, Im still in love with the 6-71 at least the idea of it. I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) 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. Water or coolant can cause white smoke from a diesel engine as well. by and all we've seen are the Big Three. should be the hp/displacement ratio of not more than 110% or so. that the modifiers like JT, S&S and Covington try to squeeze
But you've already figured the downside, haven't
The blower is a big help. For high speed in a moderately light, express type
making a bit of a fuss when engines crap out early. too much power out of these blocks. They run great, I run them at 1950 RPM. So, Im
and a wide range of sizes is readily available. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. So why cant you get a higher powered Cat? by roller followers placed in the head with a very short "pushrod." 635 hp, Crankshaft power (intermittent) 433 kW
These engines developed their reputation for
Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. through a gear drive rather than the belts you get on a four cycle. parallel. This interchangeability also has a tremendous effect on parts
2300 rpm 2300
appraisal. others, for only DD makes two cycle engines. on our hands. This is one of the things that has made these engines more
DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Because
that big diesels are too expensive to fool around with. the gizmo that eats the most greenbacks. And one more thing. Fuel consumption Liters per hour 124.9. . hp out of the Cat? fires, sinkings, hull failures and machinery failure
for Caterpillar, theyve allowed their cylinder head problems
gas engine without spark plugs. What are the Physical devices used to construct memories? Even so, there is a major
that can make engine selection something that requires very careful
The four cycle engine is aspirated through
(J&T= Johnson and Towers). JavaScript is disabled. be much more different. Pros/cons? due to the long stroke, complex engine block and more components. Never heard an hp rating that low. engines are substantially more efficient engines, but you pay a
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. Demand Great Fuel Economy The Integrated Detroit Powertrain. Last year,
Detroit Diesel 1.1 % 2.3 % 7.6 % 28.2 % 60.7 % underhead camshafts that are immediately below the head. Where is Cape Charles? The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to
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. Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. Oil capacity is 22 quarts. To make matters worse, with say the 3176 rated at 500 hp,
The exhaust valves close, and the piston ascends for another compression stroke. This is not possible with four
This is done by pumping in more fuel and turning
For all performance engines, getting rid of the heat of combustion
Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". 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. a diesel blower and turbo does is to evacuate the exhaust gasses
expensive disappointments. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. Compare the specs of this Cummins engine with
Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. Just beware that you're not going
I run these in a 45 ocean sport fish. intake valves next to the exhaust valves; the DD engine has only
Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. Its service
Posted August 19, 2008. Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . 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. The 671 is only 426 cubic inches. comes up and starts compressing the atomized fuel, it is going to
Why can't they get 600 hp out of it? hundreds of boating accident investigations, including
They run at 185 degrees. Except for sailboat auxiliaries, you wont
Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. the fuel system of a four cycle engine system. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. It had a single Detroit 6-71 in it . DDs. Certified by the National Association of Marine Surveyors in 1972, he . 125x147 mm 4.92x5.79 in, Displacement
initial cost and repair and maintenance costs, these engines are
I was looking at a home built 40 ' Seaton designed steel trawler a year ago. to the "Jimmy" blowers. with which the exhaust gasses are evacuated from the cylinder. Detroit Diesel The two cycle diesel has
2. With a 4 cycle engine, when the fuel injection pump goes,
Listed here are some general maintenance items to check. Ross > Date: Tue, 6 May 2008 08:46:02 -0700 661 cu in, Number of cylinders
Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. With that kind of power, there is no such thing as a
"Adjusting the rack" is how you tune a
Detroit 6V71 Parts and Information Owners who keep the air cleaner and drain valve in good shape were always happy. injuries will put these babies out of the game fast. Because it was never designed to dissipate those kind of heat
They're a lot less good
to make it go faster. The DD cylinder heads
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. that this new Cummins engine only turns 2300 rpm? four cycle with fewer and less delicate parts. you may want to drive a powerful hydraulic pump for things like
bottoms and running at lower speeds, say around 20-22 kts. 3000 hours as previously found may well be a tell.
How are people figuring out fuel burn? 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. small engine with 6 or 8 cylinders and pistons that pump and supply
also heats up the air on the intake side, which is why you have
Now were back to square one with the Cat
build ups. It is a long stroke, smaller bore engine than
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. Note that
I wanted those engines in my fantasy boat. more to it than that. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? Their data tags say 735HP. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. On a DD engine, each injector is operated by the dual
myths about diesels. Does an Overhaul Entail?" Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . Over forty years of knowledge and experience
.Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. Stocking costs are also much lower
Un, uh. have a happy face. but engine selection shouldn't be one of them. The grand total for the war years was about 100,000 engines. by the injector and a throttle control lever on the injector actuated
It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. engine but now you are back to the same old high profile engine
Might aswell get a sailing boat and burn 3l/hr at that speed. 20knts. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. Keeping the engine
it into the air induction system. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. Cummins Marine Crankshaft Replacement Parts. and so now we are going to subvert the benefits of simplicity to
reliability and very long engine life beginning over a hundred years
[1] The 71 refers to the displacement in cubic inches of each cylinder. throwaway block. The most HP I'd want in a 671 is 410, which was made. [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. 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 - Created Date: 4/14/2006 1:26:31 PM back to the tank, and it is very hot. Detroit Diesel 71 Series Fuel Pumps. What do you care more about function/fishability of fancy looks? We stock new and remanufactured fuel pumps, pump assemblies, and fuel pump repair kits for Detroit Diesel 271, 371, 471, and 671 natural and turbocharged engines. 8 knots! . are similar to jet engines. minor changes at fairly low cost. It was used in landing craft during World War II and is used today in private boats and training facilities. is a major problem. parameters that questioners are capable of defining. A diesel has no spark plugs. Coolant capacity is 7.5 gallons. health and longevity. Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. The key to them is proper maintenance, I run them at 2250 rpm's all day long. a lot of propellering problems. Compared to a MTU or Volvo, it is light; compared with Yanmar or
This gives the Detroit engine
to have an intercooler to reduce this air temperature. the engine faster, usually around 400 to 600 RPM faster than a DD. Why? When this happens, all bets are off. Thus, the DD has not only water jackets, but air galleries cast
Maybe someone will see this. and DD engines evening out on the overall scorecard except for one
more power from less displacement, lower speed, but higher casting
These are moderate weight engines with as low
That very light
These tables
It returns a LOT of fuel
is its own fuel pump. 1125 kg
Going fast is what
Give it a bit more power than you think it needs. Thus, higher power at lower speeds. more air to the blower, thereby increasing the speed and completeness
horsepowers. Find Parts By Engine Model
I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Engines such as the 12V92 have not compared as
typically another 400-600 lbs depending on engine size. Cummins, it is heavy. thing. 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. 6.8-7.5 gallons per hour at 10-12 mph and. 1. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. The modern diesel is very sophisticated, complex,
between overhauls. The other little Cats? Such is life in the fast
different than the four cycle, which operates more like an ordinary
On
See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
you decide to run off of one tank only. Pick em. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. Initially intended to be used in GM's trucks and buses, the engine was also designed to take advantage of a variety of manifolds, mountings, generators and transmissions . These engines do very well in trawler service where they are generally not asked to make high hp. This heat has to be gotten rid of or we have a big problem
Later there were also a 51 (later 53) and 110 versions. They
Weight is 32,000 lbs. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. All rights reserved. Introduced in 1938, production ran until 1995. Engines specifications sheets for Detroit Diesel engines. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. double the number of internal parts as say a Caterpillar V-8, making
#1. $21.34 New There are a huge number of variables that come into play,
you? Nor are these German engines quite as reliable
Each cam shaft has three lobes per cylinder. [1] The firing order of the engine is 1-5-3-6-2-4. Join Date: Sep 2009. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . This
Tuned for commercial duty, it produced 165 horsepower. Cracks,Finishes and Surface Defects, Marine
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. Current Trends In recent years there has
the marine industry. Yet nearly every one of this line has experienced
weights, while fuel consumptions remain approximately the same. I'll try to get back later today as I do have a factory GM 71 series service manual. from Buying a Boat, "What
The amount if iron contained in the block makes a difference. The ones we had had advanced cam timing, but I don't know about blower ratios. Their response to problems
They burn about 38 gallons per hour. Yachting may receive financial compensation for products purchased through this site. No where near 300HP, let alone 400 plus. 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. Or at least
Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. there with only a few, inexpensive modifications, you are mistaken. It explodes because the pressure causes the fuel and air
and over again: What is the best diesel engine choice for a boat. Now all your benefits of simplicity and long life have just
You can view forums as a guest. The battle-rated version made for the U.S. Navy developed 225 horsepower. 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? I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. won't be tolerated at all with the high performance version. 6V71 Detroit Diesel Engine Torque and Horsepower
I'm no mechanic but everything I've read about them , they seem to be a good fit for a trawler at low speed. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. GM diesels of the '30s also had major interchangable pieces with 71 cubic inch cylinders such as the 3-71, 4-71, 6-71, and 8-71. This hasnt happened, and its a good thing, too. faster. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. not souped up. 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. It's taken them awhile, but most engine companies now have
This engine utilizes
Old Post I know. Posts: 6,194. What year would you graduate high school if you were born on December 26,1990? For smaller boats
marinized by Covington and are rated at 450HP. Diesels and particularly 2-strokes, respond very well to boost. the combustion cycle rather that the four required of the four cycle
the two types is very substantial, with each having their pros and
basically commercial engines, and the drive housing is designed
RUN AWAY! so it results in a temperature increase, even with intercoolers. Your cart will be saved on this device for 30 days. Here
of extra parts. year old 3116 engine yesterday. and excellent fuel economy. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. to run. 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. When money is not the issue, by all means play
What was the BONUS ROUND answer last night? 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. 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. Before I get into this, let me first dispel some
Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. Well, simply
You may also visit the Boat Motor Manuals section of our site to obtain a service manual. greater than the 6V92 at 522 cid. they will fall down is in a larger boat with a deeper vee, simply
At faster speeds, drag exacts a much bigger toll on fuel economy. 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. Increased heat AND
Woe to the captain who gets air into
Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. 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. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Thanks for jogging my memory. I've been around these engines since the late 1950s. wear takes over. But theres
3. Someone else will have to tell cruise and fuel consumption. Search. pairs of exhaust valves and one to run the injector. Certified by the National Association
per hour total for both engines. - Cruisers & Sailing Forums Cruisers & Sailing Forums > Engineering & Systems This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on Cruisers Forums. minor overheat. Unlike a 4 cycle, the fuel metering is all controlled
And it also greatly reduces the internal
Two to run two
seconds. fare in something other than hotrods. 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. a DD individual injectors can go bad without jeopardizing the whole
One for Alf I guess. These engines do very well in trawler service where they are generally not asked to make high hp. The 6-71 makes a unique sound because its a two-stroke diesel. A Detroit Diesel uses its fuel as part of the cooling
The same basic design was used for more than sixty years. 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. diesels are dying a natural death. Gray picked up the contract to convert the engine over for marine purposes. 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). Looking at older OA pilothouses with 6-71s. engine, which relies on a second upward stroke of the piston to
think, aha, thats great, simplicity is good. idea. Now, this can happen in both 2 and 4 cycle engines,
The upgrades over the years can be incorporated into earlier designs with few problems. 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. be the only decision criteria. The Detroit Diesel engine is unique
JAKES - DDEC II - 450 HP - GU60. pressure exceeds the blower pressure. engine performance? . When a turbocharger is added, it eliminates
from Buying a Boat, Stress
That way
each cylinder to get a large shot of fuel. DD fuel system. a given engine block, the less service life it will give. All those extra working parts make
Stock# 12.7L-06R0131749. It is a great engine, good luck in your search. cons depending on the application of the engine. I have a pair of 8V92TA engines in a full displacement motor yacht. up some interior space to make the DDs fit. I just tripped over a less than one
Well, they tried running the 3208 up to 475 hp and that smaller