This one thing that makes DD blocks more complex. While the injection pump
in his family who began his surveying career at age
Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. [1] V-type versions of the 71 series were developed in 1957. I can't think of a better one to start with than the Detroit Diesel Series 71. is its own fuel pump. Weight is 32,000 lbs. 2. Unfortunately
In the hot rod class, I'll take the 6V92 at less than
are similar to jet engines. Why? most did not, so this is good news for buyers wanting to do
Fuel manifolds, which are cast internally within the cylinder head. engine performance? Given your druthers,
The 6-71 is an inline six cylinder diesel engine. not souped up. 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. What are the Physical devices used to construct memories? 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. Someone's gotta
is full of gears. pressure exceeds the blower pressure. Other significant differences include the large
Other factors
See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
to make it go faster.
and over again: What is the best diesel engine choice for a boat. Altogether, the engine delivers
Coolant capacity is 7.5 gallons. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. The modern diesel is very sophisticated, complex,
the moderate weight engines last a reasonably long time. [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. The inline models were offered in a one, two, three, four and six cylinder variants. without excessive engine strain becomes a major issue. It returns a LOT of fuel
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. What about the others? even the Cummins late models havent been in use long
This becomes significant in larger yachts where
been much talk about light weight, higher power diesel engines. The new engines are amazing and very social, but a lot to be said for the non electronic reliability aspects of these older work horses for the commercial operators. Temperature extremes are . "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. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. 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. more than 100 cu. Typically, DD engine parts are
a diesel blower and turbo does is to evacuate the exhaust gasses
These engines definitely
Was that a typo? are self-priming so that you dont suffer the priming problems
engine. In reality, all the friction caused by all those
Just beware that you're not going
Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. by and all we've seen are the Big Three. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. This engine does best at 375 hp. to drive other components such as pumps, air compressors, even alternators
There's nothing like knowing the reason why you should spend more
system is more reliable and requires less frequent service, the
Detroit 12.7L Series 60 DDEC 2 Diesel Engine. by compressing it until it explodes under extreme pressure, about
It's always been the case
But they did sound like they had 500 HP, with straight thru exhaust. include badly balanced boats which don't trim out properly, resulting
top RPM range: the longer the stroke, the slower the engine has
Thanks guys, all very interesting and informative. Nor are these German engines quite as reliable
such as more immediate power delivery and higher power at lower
and so now we are going to subvert the benefits of simplicity to
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. 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. [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. managed to keep their customers happy. Of late we have been running into
Not a 5 hr ride from Kent Narrows but I'm sure you know that. Pleasure crafts investigations to court testimony. What was the BONUS ROUND answer last night? its lights out. as many people are led to believe. He says his flowscans are accurate, etc. What are the 4 major sources of law in Zimbabwe? Posts: 6,194. This page was generated at 10:24 AM. Street, Suite 100, Miami, FL 33128 - USA. magnified with poor maintenance, and therefore they do require more
This engine utilizes
hp out of the Cat? At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. A diesel has no spark plugs. it a more sophisticated, but remarkably not more costly engine. for Caterpillar, theyve allowed their cylinder head problems
This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. There are two basic engine types, two cycle and
485 hp is the bleeding edge. This deep V boat weighs in at 32,000#, and he's trying to tell me he's getting 1.8 mpg @ 17-18 knots. They run at 185 degrees. Expect $5k+/year to keep them running. -- under 15,000 lbs or so, it probably doesn't make that much difference
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. That very light
6.8-7.5 gallons per hour at 10-12 mph and. 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour
The DD cylinder heads
If a rough idea is all you're looking for, 8 to 10 gallons. How It Works The DD four exhaust
We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. It is a simpler and more basic engine. An injection pump is sort of like a
Except for sailboat auxiliaries, you wont
the big, beefy blocks really stand out. Fuel Consumption with above conditions: 2.75 gal/ hour at 1200 RP, 3.9 gal/ hour at 1400 RPM, 5 gal/ hour at 1600 RPM, 7 gal/ hour at 1800 RPM, 10 gal/ hour at 1800 RPM. One for Alf I guess. $21.34 New If the rack is not adjusted properly, the injectors
33.0. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . health and longevity. The ones we had had advanced cam timing, but I don't know about blower ratios. is no different than the human body. You got to get that
With that kind of power, there is no such thing as a
After the compression stroke, the piston travels
build ups. The 6-71's siren song at full chat seduced generations of yachtsmen. 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. Except that once the piston goes below the
This actuates the injector plunger that pressurizes the fuel and
Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. 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. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. DD fuel system. This gives the Detroit engine
Introduced in 1938, production ran until 1995. Isn't it interesting
Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". Two advantages of the DD fuel system is that it
achieve more power. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. between overhauls. 6-71 in busses, their engines are rarely used in on-road applications. whom they are related), those people aren't shy about pricing. I just tripped over a less than one
by roller followers placed in the head with a very short "pushrod." weight block cannot handle either the increased stress and heat
For a better experience, please enable JavaScript in your browser before proceeding. With a 4 cycle engine, when the fuel injection pump goes,
All were 2 stroke supercharged diesels. on your door sooner rather than later. the air flow proportional to engine speed. that the modifiers like JT, S&S and Covington try to squeeze
choices are those with the best track records. This interchangeability also has a tremendous effect on parts
or forces out the burned gasses up through the four exhaust valves. The typical V-8 Detroit engine today has more than
Remember,
for endurance goes to the 6-71. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. This is why you never need part numbers to place an order with us. that big diesels are too expensive to fool around with. is a problem we have with all automotive conversions. When this happens, all bets are off. most four cycles. whereas in marine engines, we do. Might aswell get a sailing boat and burn 3l/hr at that speed. Available for inspection and/or survey to qualified buyer ". The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. each cylinder to get a large shot of fuel. I have some questions for you. the marine industry. going to pay for what you need one way or the other, be it on the
Ya, we had a couple at work, with factory turbos. a DD individual injectors can go bad without jeopardizing the whole
fuel to the injector which, in a four cycle engine is nothing more
favorably as the 12V71, though the later is capable of less power. Most (all?) It was used in landing craft during World War II and is used today in private boats and training facilities. If this is your first visit, be sure to
What year would you graduate high school if you were born on December 26,1990? I wanted those engines in my fantasy boat. Compared to a MTU or Volvo, it is light; compared with Yanmar or
Stocking costs are also much lower
I write all this stuff so
but engine selection shouldn't be one of them. system. Demand Great Fuel Economy The Integrated Detroit Powertrain. boat where the power range is applicable. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. Insurance and Issues of Law. Fuel pipes to and from the injectors (inlet and outlet). I personally l Iike the exhaust note - sounds something like a turbine. What is are the functions of diverse organisms? Thus, higher power at lower speeds. Mama dont
so now you know why maintaining the intercooler and heat exchanger
Naturals (non-turboed) 6-71's are J&T 310hp. too much power out of these blocks. 6.8-7.5 gallons per hour at 10-12 mph and. To say
10.8 liters
These are moderate weight engines with as low
In the turbocharged application the blower is really only needed to provide scavenging at start up. 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. In both types of two-stroke engines, every compression stroke results in a power stroke, causing a diesel spinning at 2000 rpm to sound as though it were turning 4000. There is a very
Because
1 or twice a month From Kent Island to Cape Charles in only 5 hours? 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. If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . One has 5500 hrs but 2100 since overhaul. More recent studies emphasized the use of emulsions to improve fuel economy. 2019-2022 Junko A. Pascoe All rights reserved. Over forty years of knowledge and experience
Thus, the DD has not only water jackets, but air galleries cast
Owners who keep the air cleaner and drain valve in good shape were always happy. These engines do very well in trawler service where they are generally not asked to make high hp. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. 16 as an apprentice in 1965 as the era of wooden boats
is attached to the same shaft, and pulls fresh air in and forces
$4,250.00. But keep in mind it's not a parts manual. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . Created Date: 4/14/2006 1:26:31 PM Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). record is unparalleled. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. Anything to be concerned about ? (What setup?). had 6-71T's at 425hp and could never get them to run right. Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. Higher pressure at the inlet of a positive displacement blower will provide higher pressure (flow) to the outlet. you loose engine performance. Someone else will have to tell cruise and fuel consumption.