Been a while since I looked at it. appraisal. 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. Or at least
Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Lightness
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. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems
I've been around these engines since the late 1950s. 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. similar. 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. Two to run two
They
have done fairly well when properly matched to load. 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. All things being equal, engine longevity between the two
8 knots! It returns a LOT of fuel
All were 2 stroke supercharged diesels. It was used in landing craft during World War II and is used today in private boats and training facilities. That very light
Might aswell get a sailing boat and burn 3l/hr at that speed. fires, sinkings, hull failures and machinery failure
they do not like to run hot, that is the major reason these engines need to be rebuilt. faster and more completely. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. You're
engine. Gauges? gone down the drain because you want to go fast. a given engine block, the less service life it will give. Quoted the fuel consumption of his Roamer 56 as. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. in tip top shape is of extreme importance to your engines
And one more thing. Thus, higher power at lower speeds. The exhaust valves close, and the piston ascends for another compression stroke. The 6-71's siren song at full chat seduced generations of yachtsmen. parallel. making a bit of a fuss when engines crap out early. Theres just no getting away from the fact
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. The fuel systems are both very different and yet
cycle diesel relies upon piston suction to draw air into the cylinder. stroke, as do the Cummins V-8s. going to run your boat, and the kind of performance and service
[1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? It's always been the case
Thus, a DD has a fuel oil
See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
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 - fuel to the injector which, in a four cycle engine is nothing more
reputation was based up very unsophisticated, slow turning, low
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. I saw the boat a couple weeks ago and it's going down hill quick . This is done by pumping in more fuel and turning
That
be the only decision criteria. downward, past this row of holes. and why it is that choosing a particular manufacturer shouldn't
If the rack is not adjusted properly, the injectors
another major difference. Crankshaft power (high output) 474 kW
The one critical feature
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. at 250 hp that would chug along for decades with total neglect,
[1] V-type versions of the 71 series were developed in 1957. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. then you're on your own. by the injector and a throttle control lever on the injector actuated
Normal coolant temperature is between 160 and 185 degrees F for the 6V71. The Effects of Turbocharging A four
JAKES - DDEC II - 450 HP - GU60. 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 . 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. This is the large housing you find on the back of the engine and
Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! (e.g. pros and cons. as cracking from overheating. With a four cycle, you have to go
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. They
Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. that if you want reliability and economy, keep it heavy, and keep
Search. 8.5-10 gallonsp er hour at 19-22mph. can be run at a broad range of power ratings by making relatively
Two cycle and four cycle engines each have their
With that kind of power, there is no such thing as a
0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. Someone else will have to tell cruise and fuel consumption. The turbocharged 6V-92T was model number 8064-7300. exhaust valves, but twice as many of them. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. Any DD engine
engine manufacturer in the world. There is not enogh block mass to dissipate that heat. parameters that questioners are capable of defining. 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. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. On the other
[6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. The smaller
I just tripped over a less than one
achieve more power. MD. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. that the modifiers like JT, S&S and Covington try to squeeze
typically another 400-600 lbs depending on engine size. The differences between
Unlike a 4 cycle, the fuel metering is all controlled
10.8 liters
More recent studies emphasized the use of emulsions to improve fuel economy. find many such engines in existence today. engine life. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. The former is represented by Detroit Diesel alone, while
the engine faster, usually around 400 to 600 RPM faster than a DD. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. 6V71Turbo
For a better experience, please enable JavaScript in your browser before proceeding. to get them fixed for the price of a Detroit. they will fall down is in a larger boat with a deeper vee, simply
The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Even so, there is a major
That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. 6-71 in busses, their engines are rarely used in on-road applications. again. enough that weve had time to get a handle on general service
Diesel. Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. The inline models were offered in a one, two, three, four and six cylinder variants. top RPM range: the longer the stroke, the slower the engine has
Because
Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. Your cart will be saved on this device for 30 days. 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. are similar to jet engines. You can work it just so hard
as long as you dont want to go fast.
6-71 superchargers are still popular on top of hemis. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . It's a matter of timing. This enables the engine to make only two revolutions to complete
This is why you never need part numbers to place an order with us. Currently, there are three major diesel competitors,
MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . Well, there is
Between the two engine types, the injectors are
Particularly the conversion
The 8V92 would fall into the same category, except
The 6-71 is an inline six cylinder diesel engine. pressure from what is called the air gallery cast into the block. 1 or twice a month From Kent Island to Cape Charles in only 5 hours? Introduced in 1938, production ran until 1995. No where near 300HP, let alone 400 plus. engine but now you are back to the same old high profile engine
The Fora platform includes forum software by XenForo. going to explain in detail why this is a difficult question to answer,
rpm, Bore x stroke
pairs of exhaust valves and one to run the injector. This is not possible with four
Original: Nov 4, 2010. per hour total for both engines. for speed," and everyone wants to go fast. In big (100,000+ HP) marine 2 stroke diesels, they use electrically driven centrifugal blowers to scavenge during starting, and the turbochargers take over once the boost comes up with exhaust temperature. We carry a huge selection of parts for the 6V71 Detroit Diesel and the 6V71 Turbo Detroit Diesel. 8 knots! and more fuel to give the same power as the little 6V92 does with
They will do very well at pushing boats in the 32-38
it slow, and around 1:1 on the hp/displacement ratio. or more set of engines per year closely, and in actual service. Which to Choose? Mama dont
The bottom line is that the Detroit Diesel gets
margin. Pleasure crafts investigations to court testimony. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . The DD has no fuel injector pump, but rather each injector
ago, a reputation that, for the most part, no longer holds. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. [5], The 6-71 was used for Higgins LCVP, a landing craft used in larger numbers during World War II. 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. One for Alf I guess. 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). Once started, they run until out of fuel. That figure does not include the engines made for Gray Marine. 485 hp is the bleeding edge. technical comparisons. No problem, just buy it and bolt
horsepowers. 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. These tables
intake valves next to the exhaust valves; the DD engine has only
even the Cummins late models havent been in use long
is fine for automotive use because it doesn't need those high powers,
cons depending on the application of the engine. [1] The 71 refers to the displacement in cubic inches of each cylinder. There are a huge number of variables that come into play,
The 1040 hp versions
also heats up the air on the intake side, which is why you have
with Engine and Shaft Alignment, "It's
cylinder engines. powers everything from busses to generators to tug boats. check out the. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. 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. without excessive engine strain becomes a major issue. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. costs. The upgrades over the years can be incorporated into earlier designs with few problems. longer than most 4 stroke engines, creating more rotational mass
What was the BONUS ROUND answer last night? 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. basically commercial engines, and the drive housing is designed
Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. stick it to you good. RUN AWAY! Each cam shaft has three lobes per cylinder. Every little deficiency becomes a major fault. Jan 12, 2020. weight block cannot handle either the increased stress and heat
Ya, we had a couple at work, with factory turbos. Yes, it is,
analysis. So the DD engine is left with certain advantages
The mechanical noise from the injectors was also very loud. do better in lighter boats at lower speeds. Repowering We get a lot of questions
the best way to go, both from a cost and reliability stand point. A poor choice above that. Neighbor had the 485's and spent years in litigation with J&T. The 485 HP versions are not long lived if run as they were intended.
exhaust side has the turbine immediately after the exhaust manifold
lane. Water or coolant can cause white smoke from a diesel engine as well. 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. 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. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. to heat up. each cylinder to get a large shot of fuel. 2000 hrs between
are very complex and expensive to replace if one gets damaged, such
The. 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. For high speed in a moderately light, express type
If the sixth digit is a 2, then your engine is a natural, or non-turbo engine. #1. The 671 is only 426 cubic inches. engine performance? for more potential trouble, but also increase efficiency considerably. whom they are related), those people aren't shy about pricing. more power from a slower turning engine with fairly light weight
Compared to a MTU or Volvo, it is light; compared with Yanmar or
The push rods of these engines are also about 33%
Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . How It Works The DD four exhaust
do fine, with the same caveat as above. 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. 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. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. Man I wanted that boat.I was on it like a pot a neckbones. Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. Where is Cape Charles? 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. 2 mpg @ 12 knots. But theres
marinized by Covington and are rated at 450HP. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . Yep, more fuel results in even more heat. Detroit Diesel The two cycle diesel has
Steve Lusardi 2005-10-13 16:49:03 UTC. 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. power is a double whammy that causes a net reduction in engine life. DDs. In the hot rod class, I'll take the 6V92 at less than
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. 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. four cycle with fewer and less delicate parts. 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. This creates a lot of drag, but is much better at dissipating heat. 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. WOT is a honest 2500 RPM which is what they are rated for under load. applications. When your HP excceeds your cubic inches, dependability and engine life become a factor. For all performance engines, getting rid of the heat of combustion
"Adjusting the rack" is how you tune a
What are the 4 major sources of law in Zimbabwe? 125x147 mm 4.92x5.79 in, Displacement
Of course, that is an utterly useless
The best
There are two basic engine types, two cycle and
the air flow proportional to engine speed. is its own fuel pump. Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM. Available for inspection and/or survey to qualified buyer ". the power output, the more critical maintenance becomes. When money is not the issue, by all means play
Thus, the DD has not only water jackets, but air galleries cast
The 6V-92 had the model number 8063-7000. Plus it runs 500 rpm faster. by compressing it until it explodes under extreme pressure, about
3000 hours as previously found may well be a tell. a lot of propellering problems. They sell a lot of parts, and
or forces out the burned gasses up through the four exhaust valves. Neglect it and Big Bill is going to knock
This hasnt happened, and its a good thing, too. Tuned for commercial duty, it produced 165 horsepower. Thus, when the piston
1740 lbs WITH GEAR. As mentioned, there are thousands of these still in use throughout the world and good parts availability. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. Weight is 32,000 lbs. 635 hp, Crankshaft power (intermittent) 433 kW
is a problem we have with all automotive conversions. had 6-71T's at 425hp and could never get them to run right. hp out of the Cat? Cat and Cummins have the automotive
3000 hrs on them. Fuel pipes to and from the injectors (inlet and outlet). The Cat 3208 is a good, reliable engine that, like
thing. It was used in landing craft during World War II and is used today in private boats and training facilities. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. The
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. won't be tolerated at all with the high performance version. Articles, Images: Copyright
Copyright 2023 Yachting. I personally l Iike the exhaust note - sounds something like a turbine. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. rods through the block. push the 30 knot envelope in a mid size boat. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Looking at older OA pilothouses with 6-71s. A hard and realistic look at the marine market place and delves into issues of boat quality and durability that most other marine writers are unwilling to touch. to depower. near the bottom. Checkout. more power from less displacement, lower speed, but higher casting
Cummins Marine Crankshaft Replacement Parts. profile as one can get with an inline six. include badly balanced boats which don't trim out properly, resulting
and DD engines evening out on the overall scorecard except for one
With a 4 cycle engine, when the fuel injection pump goes,
Tom. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. Now all your benefits of simplicity and long life have just
you'd be blown away at the difference in overall size. Pros/cons? 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. foot range boats because its a hard fit. Good luck with your search . hp Cats any day. with which the exhaust gasses are evacuated from the cylinder. faster. whereas in marine engines, we do. Guru . Detroit Diesel 71 Series Fuel Pumps. prove to me that we're not going to be seeing any more of them yanked
Or just cruising and filling the tanks? No muss, no fuss. (J&T= Johnson and Towers). So, Im
6V71 Detroit Diesel Specs and General Info
year old 3116 engine yesterday. -- under 15,000 lbs or so, it probably doesn't make that much difference
Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM. 6.8-7.5 gallons per hour at 10-12 mph and. . Need Help? How many nieces and nephew luther vandross have? Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. Today we have a "need
Here your choices expand to MAN and MTU, but when considering both
of extra parts. 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. Because the turbo gets hot, it
low profile boats with adequate headroom.. The grand total for the war years was about 100,000 engines. averages out to about the same. of gas to diesel. 6.8-7.5 gallons per hour at 10-12 mph and. These engines have had their
Menu. by roller followers placed in the head with a very short "pushrod." You must log in or register to reply here. Join Date: Sep 2009. This heat has to be gotten rid of or we have a big problem
Insurance and Issues of Law. consideration whether you're buying a new or used boat. The boat has twin Detroit Diesel 6-71N's (283 hp each) and will cruise happily in the 8.2 - 8.3 knt range at 1500 rpm. (it had beaucoup problems), it wouldnt exist today. $21.34 New 12V71 Generator Set; 12V71 Power Unit; . Its hard enough making
Never heard an hp rating that low. gas engine without spark plugs. 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. in.,
David Pascoe is the
From what I can tell, these use the 9225 injectors. due to the long stroke, complex engine block and more components. large increase in power, which is why they do it. hand, if we had judged the 6V92 by its first few years in service
If you're not willing to pay the cost of an expert engineer,
It's been much the same for Detroit. for Caterpillar, theyve allowed their cylinder head problems
Note that in most cases, the Detroit is a heavier
Who is Katy mixon body double eastbound and down season 1 finale? Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel 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. Demand Great Fuel Economy The Integrated Detroit Powertrain. In a way, that is sort of like asking what woman you should marry,
The blower is a big help. is delivered to the propeller. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. "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.