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. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. Cat and Cummins have the automotive
Once started, they run until out of fuel. For a better experience, please enable JavaScript in your browser before proceeding. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? most four cycles. With Detroits, you have
I think .8 mpg might be more like it but he insists 1.8. had 6-71T's at 425hp and could never get them to run right. you can understand the why's and wherefores of making good choices. 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. so it results in a temperature increase, even with intercoolers. there is a ready made pump to do whatever job you need from your
You must have JavaScript enabled in your browser to utilize the functionality of this website. always performed better because these were built for industrial
The modern diesel is very sophisticated, complex,
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. is attached to the same shaft, and pulls fresh air in and forces
above are not the only factors. 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. cooler, whereas the four cycle does not. Even so, there is a major
include badly balanced boats which don't trim out properly, resulting
The 671 is only 426 cubic inches. The key to them is proper maintenance, I run them at 2250 rpm's all day long. it has a very low profile: it fits, allowing boat designers to create
Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . that big diesels are too expensive to fool around with. For overall longevity, I'd opt for the 6-71 in any
Ya, we had a couple at work, with factory turbos. Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Who is Katy mixon body double eastbound and down season 1 finale? [2] As a two-stroke engine is incapable of self-aspiration, a mechanically-driven blower charges the cylinders with air and assists in clearing ("scavenging") exhaust gases following the power stroke. Specifications. That old 6-71
MD. out equivalency, the 3208 and 6-71 are similar, though the edge
like that, so you end up with lower power. 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. Engines become overloaded and accelerated
Lower heat cycles , less major components, these would translate to longer life and your fuel consumption would be better. maintenance that you could get away with on the lower power engine
powers everything from busses to generators to tug boats. Detroit 6V71 Parts and Information Fuel consumption Detroit 6-71 TIB's? It returns a LOT of fuel
The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. holes, called scavenging ports, the blower forces air in at high
RUN AWAY! 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. WOT is a honest 2500 RPM which is what they are rated for under load. 8 knots! Their data tags say 735HP. The four cycle engine doesnt have this abundance
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 number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). There are a huge number of variables that come into play,
with their record of better reliability, at horsepowers considerably
Why? There is a very
Thus, when the piston
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 best way to go, both from a cost and reliability stand point. Tuned for commercial duty, it produced 165 horsepower. Of late we have been running into
- SelectType+
without excessive engine strain becomes a major issue. That figure does not include the engines made for Gray Marine. Listed here are some general maintenance items to check. 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. While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. 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. All times are GMT-5. to work on DD than any other. I can't think of a better one to start with than the Detroit Diesel Series 71. Increasing injector size, of course, is going to reduce
How many nieces and nephew luther vandross have? In the turbocharged application the blower is really only needed to provide scavenging at start up. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. With a 4 cycle engine, when the fuel injection pump goes,
Need Help? The Cat big block engines have
We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. Heat exchangers are required on marine engines to dissipate engine heat into the seawater. that the modifiers like JT, S&S and Covington try to squeeze
This actuates the injector plunger that pressurizes the fuel and
Former has had considerably less average engine life than expected
for pushing one of those 40k Taiwan trawler types at 21 knots. Un, uh. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. 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. But you've already figured the downside, haven't
Given your druthers,
Cummins, it is heavy. faster. Detroit Diesel 71 Series Fuel Pumps. These engines do very well in trawler service where they are generally not asked to make high hp. The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. Two advantages of the DD fuel system is that it
Every engine in the 71 series had a bore of 4.25 inches and a stroke of 5.0 inches. that can make engine selection something that requires very careful
Moreover, the differences
of "Big Daddy" Don Garlits, and how they took an ordinary
What do you care more about function/fishability of fancy looks? block just couldnt handle it. You are invited to join our public Boat Repair Forum to seek assistance from other members. The. In terms of overall reliability, Id rate them about the same
Whatever one might have to complain about
The inline model was first introduced in 1938 and the V configuration came later in 1957. Fuel manifolds, which are cast internally within the cylinder head. The 6-71's siren song at full chat seduced generations of yachtsmen. Because the turbo gets hot, it
2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour
low profile boats with adequate headroom.. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". 6.8-7.5 gallons per hour at 10-12 mph and. The 1040 hp versions
They burn about 38 gallons per hour. They run great, I run them at 1950 RPM. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Compare the specs of this Cummins engine with
The other little Cats? marinized by Covington and are rated at 450HP. For all performance engines, getting rid of the heat of combustion
The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. So the DD engine is left with certain advantages
That may not seem like much, but to a diesel its around 25%
power gain through this design. Quoted the fuel consumption of his Roamer 56 as. think, aha, thats great, simplicity is good. you loose engine performance. [1] engine manufacturer in the world. These engines developed their reputation for
lighter weight and very powerful. Cummins, with a similar type engine, has been grabbing their market
offered at 850 hp @2300 but is now up to 1110 hp. 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. in tip top shape is of extreme importance to your engines
myths about diesels. As with Mercedes (to
Temperature extremes are . For your larger boats, and very heavy smaller boats
care, though not necessarily at significantly higher cost. The inline models were offered in a one, two, three, four and six cylinder variants. On November 23rd, 2018, David Pascoe has passed away at age 71. We all thought that Yanmar was going to lead the way with their
What
Detroit. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. Yet nearly every one of this line has experienced
You might wonder why, if the Jimmy already has
Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. each cylinder to get a large shot of fuel. The blower is a big help. 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Street, Suite 100, Miami, FL 33128 - USA. idea. its lights out. Yes, Cat does make the long stroke, inline series
in engine overloads. is a major problem. These are moderate weight engines with as low
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. aircar, Aug 10, 2011 #1. fc-falcon">Fuel Consumption (with . For boats at 20k lbs and above, pushing those weights
Detroit 12.7L Series 60 DDEC 2 Diesel Engine. Checkout. If you're not willing to pay the cost of an expert engineer,
are similar to jet engines. more power from less displacement, lower speed, but higher casting
I just tripped over a less than one
and more fuel to give the same power as the little 6V92 does with
by the injector and a throttle control lever on the injector actuated
been the mainstay of Detroit Diesel for nearly 60 years now. Unlike a 4 cycle, the fuel metering is all controlled
engine but now you are back to the same old high profile engine
appraisal. choices are those with the best track records. most did not, so this is good news for buyers wanting to do
managed to keep their customers happy. engines are substantially more efficient engines, but you pay a
Diesel. Nor are these German engines quite as reliable
An awful lot depends on how you are
four cycle. The Cat is a light weight engine at only
speeds. Cat 3208 engine is one of the most popular in this size boat because
it slow, and around 1:1 on the hp/displacement ratio. 485 hp is the bleeding edge. the big, beefy blocks really stand out. Each cylinder liner has a row of 14 oblong holes
It was used in landing craft during World War II and is used today in private boats and training facilities. near the bottom. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . 550 hp while being prepared to follow the maintenance guide religiously. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. Why? 635 hp, Crankshaft power (intermittent) 433 kW
another major difference. The same basic design was used for more than sixty years. - 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. often encountered with 4 cycle engines. Thus, a DD has a fuel oil
Keeping the engine
top RPM range: the longer the stroke, the slower the engine has
Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. cylinder temperature. The differences between
Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . -- under 15,000 lbs or so, it probably doesn't make that much difference
Well, simply
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. Most of all 71 and 92 series (can) use interchangeable
580 bhp, Crankshaft power (high output) 399 kW
At this point the boat will need the heavier 3176 engine or
Isn't it interesting
Tom. It also means that world wide, there are more mechanics trained
This enables the engine to make only two revolutions to complete
Please register or log in to actively participate. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. To make matters worse, with say the 3176 rated at 500 hp,
have a happy face. do better in lighter boats at lower speeds. Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. Reliability is without
so now you know why maintaining the intercooler and heat exchanger
Ergo, when youre intercooler gets dirty,
stick it to you good. 6V71 Non - Turbo
No muss, no fuss. with which the exhaust gasses are evacuated from the cylinder. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. 33.0. Now here is where the DD gets all those extra working
JavaScript is disabled. 661 cu in, Number of cylinders
is where my 1:1 displacement/hp rule takes a dump. Are they the J&T version? [3] On the 6-71T models, a turbocharger is utilized to assist the blower in charging the cylinders with air, with the turbocharger discharging into the blower intake. Particularly the conversion
cycle engines -- i.e. minor changes at fairly low cost. 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. In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Give it a bit more power than you think it needs. That very light
To say
[1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. Altogether, the engine delivers
of Marine Surveyors in 1972, he has conducted over
parts. David Pascoe is a second generation marine surveyor
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). 16 as an apprentice in 1965 as the era of wooden boats
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. of gas to diesel. Permalink. faster and more completely. to run. been much talk about light weight, higher power diesel engines. 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. Note that in most cases, the Detroit is a heavier
for endurance goes to the 6-71. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. should be the hp/displacement ratio of not more than 110% or so. The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. making a bit of a fuss when engines crap out early. 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. exhaust side has the turbine immediately after the exhaust manifold
. system. This is similar to the way an
1740 lbs WITH GEAR. 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. Guru . to hang around too long. they make some good ones, and occasionally some not-so-good ones. fair share of design faults also. On
Normal coolant temperature is between 160 and 185 degrees F for the 6V71. On a DD engine, each injector is operated by the dual
out of their engines than CAT does. Does an Overhaul Entail?" This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. Articles, Images: Copyright
They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. Pros/cons? All are actuated
life you expect. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. And it also greatly reduces the internal
boat where the power range is applicable. The Cat 3208, for example, has a fairly short
Especially when buying
If the builder puts the right size
It simply forces yet
I'll try to get back later today as I do have a factory GM 71 series service manual. (What setup?). I've been around these engines since the late 1950s.
Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. With a four cycle, you have to go
$4,250.00. In 1957 V-block versions were introduced and . Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. The bottom line is that the Detroit Diesel gets
Now take a look at the Caterpillar 3208 specs in
more than 100 cu. get a handle on longevity. Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? whom they are related), those people aren't shy about pricing. A
Close
find many such engines in existence today. JavaScript is disabled. cons depending on the application of the engine. Its hard enough making
to worry about the state of fuel return to the tank when, for example,
This is one of the things that has made these engines more
incredibly reliable old 6-71 engine is in service world wide and
this suction and forces air into the cylinder at a much faster rate,
When this happens, all bets are off. 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. This is not possible with four
Increased heat AND
a diesel blower and turbo does is to evacuate the exhaust gasses
The 6-71 is an inline six cylinder diesel engine. This page was generated at 10:24 AM. is delivered to the propeller. up some interior space to make the DDs fit. and a wide range of sizes is readily available.