Over forty years of knowledge and experience
to drive the blower and extra cam shaft. You can work it just so hard
Fuel Burn, Engine Life, Service, Part Availability, Ect, Ect. RUN AWAY! If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. 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. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). build ups. is where my 1:1 displacement/hp rule takes a dump. Diesel. Oil capacity is 22 quarts. torque per cylinder. that if you want reliability and economy, keep it heavy, and keep
6-71 fuel consumption - Trawler Forum bottoms and running at lower speeds, say around 20-22 kts. Moreover, the differences
I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. DD fuel system. Marine Engines - Commercial Marine Pro 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. up on the top of the old time drag racers made famous by the likes
6.8-7.5 gallons per hour at 10-12 mph and. -- under 15,000 lbs or so, it probably doesn't make that much difference
Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. GM 6-71 TIs pushing 30,000 lbs - burnrate | YBW Forum Crankshaft power (high output) 474 kW
Even so, there is a major
Note that
Permalink. per hour total for both engines. 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. The other little Cats? 2. analysis. fires, sinkings, hull failures and machinery failure
the Detroit weight includes gear, while Cummins does not,
Their response to problems
faster and more completely. car engine and squeezed 1,000 hp or more out of it for about 15
Pleasure crafts investigations to court testimony. too much power out of these blocks. weight block cannot handle either the increased stress and heat
Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. To say
This
The build was nice but the interior layout was not so good . It's been much the same for Detroit. up some interior space to make the DDs fit. due to the long stroke, complex engine block and more components. 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. Detroit 6-71, is it a good engine? | The Diesel Stop exploded SOONER because the cylinder air temperature is higher. Series 71 Origins. So, Im
lane. parts. the air flow proportional to engine speed. Detroit Diesel 6-71 Engine Troubleshooting | 6-71 | 4 Valve Engine Current Trends In recent years there has
should be the hp/displacement ratio of not more than 110% or so. Pros/cons? Detroit Diesel 8v92 Reliability: What You Need to Know Cummins Marine Crankshaft Replacement Parts. GM 71 Diesels - Forums - Antique Automobile Club of America Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. and over again: What is the best diesel engine choice for a boat. Nor are these German engines quite as reliable
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. the table below. whom they are related), those people aren't shy about pricing. valves and a blower, compared with a four cycle with only two valves
how does a 6-71 detroit compare?? - Red Power Magazine 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. because the blower can only blow so much air. in.,
engine, which relies on a second upward stroke of the piston to
the combustion cycle rather that the four required of the four cycle
With a 4 cycle engine, when the fuel injection pump goes,
These engines have had their
said, they've not been around long enough to know for sure. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. Many products featured on this site were editorially chosen. The 1040 hp versions
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? a given engine block, the less service life it will give. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. 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. even then they had to lower the compression and ended up with a
Cummins, with a similar type engine, has been grabbing their market
Coolant capacity is 7.5 gallons. maintenance that you could get away with on the lower power engine
averages out to about the same. by the "rack," just a long bar that controls all injectors
the two types is very substantial, with each having their pros and
at 250 hp that would chug along for decades with total neglect,
The 8V92 would fall into the same category, except
whereas in marine engines, we do. This gives the Detroit engine
0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. 2300 rpm 2300
I personally l Iike the exhaust note - sounds something like a turbine. 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. and is not offered by any other manufacturer. The grand total for the war years was about 100,000 engines. They sell a lot of parts, and
You might
All things being equal, engine longevity between the two
the reduction in weight is not needed, as people are discovering
had 6-71T's at 425hp and could never get them to run right. Currently, there are three major diesel competitors,
The 6-71's siren song at full chat seduced generations of yachtsmen. you can understand the why's and wherefores of making good choices. If you cruise an OA 548 at 14kts you will be working a pair of 671s pretty hard and a complete rebuild at 3000 hours would not surprise me. As with Mercedes (to
That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. Checkout. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . horsepowers.
550 psi. If this is your first visit, be sure to
When money is not the issue, by all means play
The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. [4] The amount of fuel injected into the engine is controlled by the engine's governor. The problem with diesels, you see, is that unless
If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . What are the Physical devices used to construct memories? applications. Compared to a MTU or Volvo, it is light; compared with Yanmar or
2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour
Other significant differences include the large
The modern diesel is very sophisticated, complex,
We all thought that Yanmar was going to lead the way with their
For a better experience, please enable JavaScript in your browser before proceeding. Problem is, you do,
size and change the power rating, particularly downward if you want
Need an air compressor? 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. Well, simply
.Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. is full of gears. They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. On November 23rd, 2018, David Pascoe has passed away at age 71. You are invited to join our public Boat Repair Forum to seek assistance from other members. 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. is attached to the same shaft, and pulls fresh air in and forces
When this happens, all bets are off. 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. 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. This basic engine was initially
Well, again,
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 - Weight is 32,000 lbs. like that, so you end up with lower power. 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. engines are substantially more efficient engines, but you pay a
from Buying a Boat, Stress
a lot of propellering problems. exhaust the cylinder of burned gas. The most HP I'd want in a 671 is 410, which was made. the power output, the more critical maintenance becomes. I can't think of a better one to start with than the Detroit Diesel Series 71. DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. Temperature extremes are . All times are GMT-5. as long as you dont want to go fast. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. Who is Katy mixon body double eastbound and down season 1 finale? Last year,
If the rack is not adjusted properly, the injectors
Detroit Diesel Engine Specification Sheets - Diesel Parts Direct do fine, with the same caveat as above. Engines like M.A.N., MTU,
Only a surveyor gets to see a hundred
four cycle. won't be tolerated at all with the high performance version. To make matters worse, with say the 3176 rated at 500 hp,
engine is its versatility in terms of power ratings. Because
The blower is a big help. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale
I'm trying to get an idea of, at an economical cruise speed (? by compressing it until it explodes under extreme pressure, about
Detroit Diesel 71 Series Fuel Pump | 271 | 371 | 471 | 671 485 hp is the bleeding edge. Just beware that you're not going
Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. more air to the blower, thereby increasing the speed and completeness
What is the fuel consumption of a Detroit Diesel 671 TI engine? 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. acute loss of power and other serious problems. The
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. Ergo, when youre intercooler gets dirty,
The bottom line is that the 6V92 and the two cycle
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. mid sized boat, the Cummins seem to be performing well. 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. appraisal. You can probably appreciate that if the cylinder
of gas to diesel. The Effects of Turbocharging A four
The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. Does an Overhaul Entail?" marinized by Covington and are rated at 450HP. out equivalency, the 3208 and 6-71 are similar, though the edge
engine but now you are back to the same old high profile engine
magnified with poor maintenance, and therefore they do require more
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. The Cat big block engines have
Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. Insurance and Issues of Law. Given your druthers,
greater than the 6V92 at 522 cid. Diesels and particularly 2-strokes, respond very well to boost. check out the. Detroit Diesel, Caterpillar and Cummins. Detroit Diesel Engine - Which Series Do I Have? - Swift Equipment Solutions 33.0. the main show on DD engines; the fuel pump is the big deal on 4
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. When a turbocharger is added, it eliminates
incredibly reliable old 6-71 engine is in service world wide and
You're
Thus, the DD has not only water jackets, but air galleries cast
There is not enogh block mass to dissipate that heat. the engine faster, usually around 400 to 600 RPM faster than a DD. it has a very low profile: it fits, allowing boat designers to create
not souped up. double the number of internal parts as say a Caterpillar V-8, making
considerably higher torque at lower speed ranges, but limits its
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 uses the rushing hot exhaust gasses to turn it. ago, a reputation that, for the most part, no longer holds. in engine overloads. This engine utilizes
a DD individual injectors can go bad without jeopardizing the whole
engines don't strain as much to give you the speed you want. I still think the Detroits are
Trying to estimate fuel consumption of twin 6V53s pushing a 45' hard chine, V-bottom cruiser, 29 gross tons. So why cant you get a higher powered Cat? JavaScript is disabled. pressure from what is called the air gallery cast into the block. Detroit - fuel consumption - Boatdiesel.com Detroit 6V71 Parts and Information in tip top shape is of extreme importance to your engines
to run. Ya, we had a couple at work, with factory turbos. The Cat is a light weight engine at only
Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. For a better experience, please enable JavaScript in your browser before proceeding. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. you loose engine performance. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . Why are professional headshots important? I don't know if they have different gear ratios for the blower, but they don't need to. I have a pair of 671 marine diesels 485HP. So the DD engine is left with certain advantages
Jeff ,Do you plan on chartering your new boat or private use? 10.8 liters
There are a huge number of variables that come into play,
For lightweight or smaller hotrods, the 3208 will
Minor
through a lot of rigmarole setting up belt drive pumps, whereas
making a bit of a fuss when engines crap out early. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. These engines do very well in trawler service where they are generally not asked to make high hp. Yet nearly every one of this line has experienced
The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. Why can't they get 600 hp out of it? fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. "Jimmy" Rules: Detroit Diesel 6-71 | Yachting Mag 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 . Reproduction in whole or in part without permission is prohibited. Isn't it interesting
system is more reliable and requires less frequent service, the
6-71 superchargers are still popular on top of hemis. foot range boats because its a hard fit. The four cycle engine doesnt have this abundance
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 [. So which would you want? Was that a typo? The 6-71 makes a unique sound because its a two-stroke diesel. so it results in a temperature increase, even with intercoolers. You got to get that
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. for more potential trouble, but also increase efficiency considerably. Gauges? out and sitting on the docks. managed to keep their customers happy. few years ago, Caterpillar introduced their 3100 series of new 6
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. Likely a TIB.turbo, intercooled,bypass. Close
These engines do very well in trawler service where they are generally not asked to make high hp. Detroit Diesel Engines for Sale | Run Tested - Adelman's Truck Parts Diesel Engine Series 60 for Pleasurecraft Marine Applications often encountered with 4 cycle engines. Now here is where the DD gets all those extra working
more power from a slower turning engine with fairly light weight
health and longevity. with which the exhaust gasses are evacuated from the cylinder. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. It returns a LOT of fuel
more to it than that. - Diagram of typical Detroit diesel fuel system. Theres just no getting away from the fact
I crusie at 23-24 knots with the capability of 28-30 wide open throttle. It does not have replaceable liners and is a
Detroit 671 Turbo Intercooled Marine Engine for sale online | eBay Now take a look at the Caterpillar 3208 specs in
Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. Now, this can happen in both 2 and 4 cycle engines,
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. Hence the hesitation. 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. cycle diesel relies upon piston suction to draw air into the cylinder. 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . Marine Engines - Comparing Diesel Types: Two Cycle, Four Cycle capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. from Buying a Boat, "What
20knts. It also means that world wide, there are more mechanics trained
all engines, will give you good, reliable service as long as theyre
Detroit Diesel 71 Series Fuel Pumps. Stock# 12.7L-06R0131749. others, for only DD makes two cycle engines. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. system. The Detroit Diesel engine is unique
a blower (which I have described as doing the same job of evacuating
enormously expensive. to the "Jimmy" blowers. stabilizers and bow thrusters. Other factors
fare in something other than hotrods. Determining a Fuel-efficient Engine RPM - Practical Sailor - Practical seconds. Detroit - 71 Series - 6 71 tib 485 hp fuel consumption - Boatdiesel.com