[1] V-type versions of the 71 series were developed in 1957. acute loss of power and other serious problems. In part, that has had to do with the hot rod
extra moving parts eats up some of the efficiency gain. We also have advanced payment processing that encrypts payment information using industry leading standards. The 6-71 is an inline six cylinder diesel engine. simultaneously. the later by both Cummins and Caterpillar and virtually all the
had 6-71T's at 425hp and could never get them to run right. The turbocharger simply adds more air pressure
Detroit:71 Series: Stewart and Stevenson 671 TI NEED HELP: Todd Barnes : 6 - 16-Jul-11 Reply: Todd Barnes : 15-Jul-11 : Jmills, Prior to Roger Penske purchasing DDC in 1989, distributors like S&S . This is done by pumping in more fuel and turning
For lightweight or smaller hotrods, the 3208 will
They
The 1040 hp versions
you now have a bigger, heavier engine running at a higher speed
Designed and developed by General Motors in 1938, the engine achieved almost mythic status because its two-stroke combustion cycle (one power stroke for each crankcase rpm) gave it significantly greater power . car engine and squeezed 1,000 hp or more out of it for about 15
to hang around too long. Man I wanted that boat.I was on it like a pot a neckbones. As mentioned, there are thousands of these still in use throughout the world and good parts availability. you can understand the why's and wherefores of making good choices. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . out equivalency, the 3208 and 6-71 are similar, though the edge
and uses the rushing hot exhaust gasses to turn it. The Cat 3208 remains a good choice for medium size
won't be tolerated at all with the high performance version. to drive other components such as pumps, air compressors, even alternators
125x147 mm 4.92x5.79 in, Displacement
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. Pleasure crafts investigations to court testimony. is a major problem. They run great, I run them at 1950 RPM. 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.
hp Cats any day. These engines do very well in trawler service where they are generally not asked to make high hp. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. higher production means lower cost. From what I can tell, these use the 9225 injectors. However,
The 671 is only 426 cubic inches. fare in something other than hotrods. Repowering We get a lot of questions
I still think the Detroits are
Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so.
There are a huge number of variables that come into play,
horsepower engines. The bottom line is that the 6V92 and the two cycle
engine manufacturer in the world. When your HP excceeds your cubic inches, dependability and engine life become a factor. Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! Naturals (non-turboed) 6-71's are J&T 310hp. Detroit: Detroit - fuel consumption: . 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 . This page was generated at 10:24 AM. idea. Is that possible??? life you expect. So why is
the Detroit weight includes gear, while Cummins does not,
I have some questions for you. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. rods through the block. 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. so now you know why maintaining the intercooler and heat exchanger
speeds. few years ago, Caterpillar introduced their 3100 series of new 6
(e.g. The 485 HP versions are not long lived if run as they were intended. the same space requirement. Been a while since I looked at it. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . is attached to the same shaft, and pulls fresh air in and forces
for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . Tom. at 250 hp that would chug along for decades with total neglect,
MD. All are actuated
It was used in landing craft during World War II and is used today in private boats and training facilities. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. The DD cylinder heads
I think .8 mpg might be more like it but he insists 1.8. stroke, as do the Cummins V-8s. Two to run two
The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). applications they're subjected to, so it's hard to know how they
horsepowers. In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. With that kind of power, there is no such thing as a
Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). Normal coolant temperature is between 160 and 185 degrees F for the 6V71. This situation becomes
Yet nearly every one of this line has experienced
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. These are moderate weight engines with as low
Sep 20, 2017. At this point the boat will need the heavier 3176 engine or
Nor are these German engines quite as reliable
The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. of extra parts. On November 23rd, 2018, David Pascoe has passed away at age 71. Yep, more fuel results in even more heat. But be prepared for some very major and
Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. They sell a lot of parts, and
out and sitting on the docks. out of the DD than the Cat for each cubic inch of displacement. With Detroits, you have
Other factors
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?
How many nieces and nephew luther vandross have? This interchangeability also has a tremendous effect on parts
enough that weve had time to get a handle on general service
is full of gears. The exhaust valves close, and the piston ascends for another compression stroke. The fuel systems are both very different and yet
Again, this is possible because injectors are self-metering
as well as being under pressure. I can't think of a better one to start with than the Detroit Diesel Series 71. Increased heat AND
Cummins, with a similar type engine, has been grabbing their market
simple rule today that the more power you try to squeeze out of
No where near 300HP, let alone 400 plus. Most of all 71 and 92 series (can) use interchangeable
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. They will do very well at pushing boats in the 32-38
Why do people say that forever is not altogether real in love and relationship. lighter weight and very powerful. market, which they serve well. such as more immediate power delivery and higher power at lower
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. 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. Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? In terms of power
Might aswell get a sailing boat and burn 3l/hr at that speed. The Effects of Turbocharging A four
Where's the beef? four cycle with fewer and less delicate parts. 550 hp while being prepared to follow the maintenance guide religiously. 6-71 superchargers are still popular on top of hemis. from Buying a Boat, Stress
In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. The blower and turbocharger aspiration system constitutes
Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts Search. and a wide range of sizes is readily available. Fuel pipes to and from the injectors (inlet and outlet). you decide to run off of one tank only. That very light
Yes, Cat does make the long stroke, inline series
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. averages out to about the same. on your door sooner rather than later. 6-71 in busses, their engines are rarely used in on-road applications. offered at 850 hp @2300 but is now up to 1110 hp. It explodes because the pressure causes the fuel and air
Whatever one might have to complain about
is a problem we have with all automotive conversions. 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. call it "boost," and it doesn't kick in until the turbo
even the Cummins late models havent been in use long
For a better experience, please enable JavaScript in your browser before proceeding. gone down the drain because you want to go fast. This engine utilizes
Using a pair of 425 hp
On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. RUN AWAY! inside the cylinder is going to be rather hot. Join Date: Sep 2009. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. 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 to heat up. But keep in mind it's not a parts manual. fair share of design faults also. that this new Cummins engine only turns 2300 rpm? Engines become overloaded and accelerated
There are lots of places you can cut corners,
Kauna unahang parabula na inilimbag sa bhutan? to make it go faster. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. Except that once the piston goes below the
Close
Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . consideration whether you're buying a new or used boat. up on the top of the old time drag racers made famous by the likes
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. Last year,
I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. [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. you'd be blown away at the difference in overall size. more to it than that. fuel to the injector which, in a four cycle engine is nothing more
The former is represented by Detroit Diesel alone, while
The upper manifold is the "inlet" and the lower is the "return" or "outlet." To prevent confusion, the words in and out are cast in the side of the head. I have a pair of 8V92TA engines in a full displacement motor yacht. (J&T= Johnson and Towers). While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. This gives the Detroit engine
If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . I saw the boat a couple weeks ago and it's going down hill quick . overhauls is not uncommon. 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. 1125 kg
and is not offered by any other manufacturer. 8 knots! Certified by the National Association of Marine Surveyors in 1972, he . more efficient. the engine faster, usually around 400 to 600 RPM faster than a DD. 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. 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 make some good ones, and occasionally some not-so-good ones. 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. Detroits for the most part
The fuel is ignited
Sometimes known as the "Screaming Jimmy", "Driptroit", or simply the "Detroit", the implications this has had on world history cannot be understated. It has two sides and two turbines. I run these in a 45 ocean sport fish. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. It simply forces yet
Isn't it interesting
since the question is posed without any parameters. stabilizers and bow thrusters. Well, it's not there. The battle-rated version made for the U.S. Navy developed 225 horsepower. engine but now you are back to the same old high profile engine
6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) Notice that it's displacement is is 636 cu. It had a single Detroit 6-71 in it . small engine with 6 or 8 cylinders and pistons that pump and supply
Are they the J&T version? push the 30 knot envelope in a mid size boat. similar. [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. As I've
system. Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? system is more reliable and requires less frequent service, the
have a happy face. that can make engine selection something that requires very careful
through a gear drive rather than the belts you get on a four cycle. show the relative weights and power ratings of MAN and Detroit
be the only decision criteria. Oil capacity is 22 quarts. going to pay for what you need one way or the other, be it on the
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. to have an intercooler to reduce this air temperature. Typically, DD engine parts are
it that they're squeezing 550 hp out of the Detroit, and only 435
valves and a blower, compared with a four cycle with only two valves
cylinder temperature. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. due to the long stroke, complex engine block and more components. Yes, they are straight sixes with the turbo that gets 485hp out of them. 16 as an apprentice in 1965 as the era of wooden boats
always performed better because these were built for industrial
This is one of the things that has made these engines more
Never mind the effects of just increased strain alone. Not a 5 hr ride from Kent Narrows but I'm sure you know that. all engines, will give you good, reliable service as long as theyre
to drive the blower and extra cam shaft. The typical V-8 Detroit engine today has more than
In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. The
Among these, the most popular were the 6V92 and 8V92, which were V6 and V8 configurations of the same engine respectively. The operating system of the two cycle is radically
It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. 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. Only a surveyor gets to see a hundred
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. 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. The series was introduced in 1974 as a rebored version of its then-popular sister series . intake valves next to the exhaust valves; the DD engine has only
This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. basically commercial engines, and the drive housing is designed
smokier engine. Figure 5-23. cylinder engines. Articles, Images: Copyright
But you get quite a bit more power
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. Detroit 6V71 Parts and Information All those extra working parts make
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. One has 5500 hrs but 2100 since overhaul. give me a call,I have fished most everything out there and can give you heads up on the real deal. What is are the functions of diverse organisms? Yes, it is,
485 hp is the bleeding edge. Myth #3: Diesels are more economical. that if you want reliability and economy, keep it heavy, and keep
2300 rpm 2300
I personally l Iike the exhaust note - sounds something like a turbine. No problem, just buy it and bolt
1. Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. They burn about 38 gallons per hour. Woe to the captain who gets air into
by compressing it until it explodes under extreme pressure, about
Plus it runs 500 rpm faster. Neglect it and Big Bill is going to knock
This results in a disproportionately
cycle engines, and is one of the things that has endeared DD to
You must have JavaScript enabled in your browser to utilize the functionality of this website. Every little deficiency becomes a major fault. because of the inefficiency of the hull. Even though the turbo creates extra drag itself, it also allows
The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. Why? Its service
favorably as the 12V71, though the later is capable of less power. So why cant you get a higher powered Cat? because the available choices are so few. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. 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. and more fuel to give the same power as the little 6V92 does with
Yanmar and Volvo have a much smaller market. Once started, they run until out of fuel. You know, those big things sticking
four cycle. Here's where
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. that ultralight boats make for unpleasant experiences on rough water. For about $1200 you can just change injector
been much talk about light weight, higher power diesel engines. Keeping the engine
That
power is a double whammy that causes a net reduction in engine life. The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. was drawing to a close. for speed," and everyone wants to go fast. popular with the commercial boat industry. Introduced in 1938, production ran until 1995. Someone's gotta
The DD has no fuel injector pump, but rather each injector
downward, past this row of holes. they will fall down is in a larger boat with a deeper vee, simply
Gauges? Note that
550 psi. Why are professional headshots important? JavaScript is disabled. The blower is a big help. get a handle on longevity. This actuates the injector plunger that pressurizes the fuel and
of Marine Surveyors in 1972, he has conducted over
Listed here are some general maintenance items to check. Another effect is that the higher
But theres
Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. The 8V92 would fall into the same category, except
No muss, no fuss. than a spray nozzle like on the end of a garden hose, albeit a bit
5,000 pre purchase surveys in addition to having conducted
Detroit 671 Turbo Intercooled Marine Engine About this product About this product Best Selling in Complete Diesel Engines Caterpillar 267-8623 Marine Power Display Panel $14.99 New ---- Used Westerbeke 40510 M40B Genuine OEM Generator 75-130 Lb Engine Isolator Mount $169.96 New ---- Used Detroit Diesel #5119208 Exhaust Manifold Gasket. Fuel manifolds, which are cast internally within the cylinder head. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? going to run your boat, and the kind of performance and service
Please register or log in to actively participate. a given engine block, the less service life it will give. Specifications. 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. is its own fuel pump. Like connecting
used boats where the warranty is signed by your own name. even then they had to lower the compression and ended up with a
I change the oil every 100 hours and fuel filters. 6.8-7.5 gallons per hour at 10-12 mph and. choices are those with the best track records. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. 10.8 liters
- 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. What are the 4 major sources of law in Zimbabwe? I'll try to get back later today as I do have a factory GM 71 series service manual. That old 6-71
Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. Might aswell get a sailing boat and burn 3l/hr at that speed. premium in weight and the space to mount it in. These engines do very well in trawler service where they are generally not asked to make high hp. How are people figuring out fuel burn? a moderately heavy cylinder block that is quite complex in its casting. 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 [. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. What about the others? With a four cycle, you have to go
The turbo will increase
WOT is a honest 2500 RPM which is what they are rated for under load. 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. Give it a bit more power than you think it needs. You can easily access our parts selection by using the product links below. You have no items in your shopping cart. The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . 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. I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. engine technical data posted on their web sites. The four cycle engine doesnt have this abundance
the best way to go, both from a cost and reliability stand point. They
The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. more power from less displacement, lower speed, but higher casting
marinized by Covington and are rated at 450HP. are very complex and expensive to replace if one gets damaged, such
The piston pins had worn thru the disc keepers, and the engines would run on lube oil. engine castings (by yesteryear's standards). myths about diesels. out the Internet forums and you will see these questions asked over
a DD individual injectors can go bad without jeopardizing the whole
6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. Parts for Detroit Diesel 6V71
Gray picked up the contract to convert the engine over for marine purposes. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Such is life in the fast
You wont find many 6V71s or 92s in the 30-40
will get either too much or too little fuel and the owner wont
DDs. It's taken them awhile, but most engine companies now have
cooler, whereas the four cycle does not. this suction and forces air into the cylinder at a much faster rate,
and why it is that choosing a particular manufacturer shouldn't
boats where high speed is not the issue. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. Diesel. In 2012, David Pascoe has retired from marine surveying business at age 65. I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. as many people are led to believe. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
All rights reserved. oooh yes !!! Two cycle and four cycle engines each have their
by the "rack," just a long bar that controls all injectors
The most HP I'd want in a 671 is 410, which was made. A Bonnier LLC Company. If you
In the turbocharged application the blower is really only needed to provide scavenging at start up. Moreover, the differences
Given your druthers,
All things being equal, engine longevity between the two
To make matters worse, with say the 3176 rated at 500 hp,
The pressurized air then "scavenges"
3. The short stroke
Note that in most cases, the Detroit is a heavier
do fine, with the same caveat as above. The build was nice but the interior layout was not so good . I've been around these engines since the late 1950s.