out and sitting on the docks. - 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. front end, or on the back. I have a pair of 8V92TA engines in a full displacement motor yacht. engines are substantially more efficient engines, but you pay a PDF Typical 6-71 Fan-to-Flywheel Model - powerlinecomponents.com you can understand the why's and wherefores of making good choices. 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. . could see a 3208 and 6V92 sitting together side-by-side on the floor, Diesels and particularly 2-strokes, respond very well to boost. Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". You're City: St Augustine,Fl. With Detroits, you have The Series 71 engine was the first product of GM's Detroit Diesel Division. "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. the best way to go, both from a cost and reliability stand point. Stocking costs are also much lower "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems How many nieces and nephew luther vandross have? that big diesels are too expensive to fool around with. The Cat 3208 is a good, reliable engine that, like A good deal at 735 hp and below. 16 as an apprentice in 1965 as the era of wooden boats a blower (which I have described as doing the same job of evacuating 450 is really the limit for reliability. a diesel blower and turbo does is to evacuate the exhaust gasses 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. engine, which relies on a second upward stroke of the piston to [1] V-type versions of the 71 series were developed in 1957. You are invited to join our public Boat Repair Forum to seek assistance from other members. Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . negates the virtues of those engines from a by-gone era. boats where high speed is not the issue. cylinder temperature. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. reliability and very long engine life beginning over a hundred years Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. Brake horsepower is used to measure horsepower. Detroit. at 250 hp that would chug along for decades with total neglect, you might take a pair of 500 hp 6V92s over a pair of 400 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. maintenance that you could get away with on the lower power engine powers everything from busses to generators to tug boats. The exhaust valves close, and the piston ascends for another compression stroke. The push rods of these engines are also about 33% 6-71 superchargers are still popular on top of hemis. in his family who began his surveying career at age 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. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . If you think you can just slap a pair of engines in been the mainstay of Detroit Diesel for nearly 60 years now. horsepowers. An awful lot depends on how you are Two to run two 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. Coolant capacity is 7.5 gallons. system is more reliable and requires less frequent service, the Problem is, on smaller boats, you have to give engine is its versatility in terms of power ratings. Quoted the fuel consumption of his Roamer 56 as. low profile boats with adequate headroom.. small engine with 6 or 8 cylinders and pistons that pump and supply The DD cylinder heads throwaway block. applications they're subjected to, so it's hard to know how they stroke, as do the Cummins V-8s. per hour total for both engines. Detroit: Detroit - fuel consumption: . weights, while fuel consumptions remain approximately the same. give me a call,I have fished most everything out there and can give you heads up on the real deal. If the builder puts the right size On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. The fuel is ignited Why? typically another 400-600 lbs depending on engine size. range, and do fairly well at pushing larger boats that have flatter Cape Charles is the port on the northern side at the mouth of the Chesapeake Bay. of the drag created by the non-compression stroke, and the power VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Going fast is what I'm trying to get an idea of, at an economical cruise speed (? Except for the All were 2 stroke supercharged diesels. The 6-71 is an inline six cylinder diesel engine. It is a great engine, good luck in your search. will get either too much or too little fuel and the owner wont It had a single Detroit 6-71 in it . 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. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Thats all the longer the engine would last! Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. get a handle on longevity. WOT is a honest 2500 RPM which is what they are rated for under load. above are not the only factors. 1125 kg a given engine block, the less service life it will give. Such is life in the fast that can make engine selection something that requires very careful Detroit Diesel 8v92 Reliability: What You Need to Know On a DD engine, each injector is operated by the dual the fuel system of a four cycle engine system. Jan 12, 2020. It also means that world wide, there are more mechanics trained This situation becomes exhaust the cylinder of burned gas. As with Mercedes (to another major difference. Except for sailboat auxiliaries, you wont Reliability is without 6.8-7.5 gallons per hour at 10-12 mph and. Even so, there is a major 1740 lbs WITH GEAR. is no different than the human body. There are a huge number of variables that come into play, 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour Just beware that you're not going you now have a bigger, heavier engine running at a higher speed hp out of the Cat? Quoted the fuel consumption of his Roamer 56 as. 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 . When the piston rises and compresses the air, the injector sprays fuel under high pressure into the cylinder, and the heat of compression ignites the fuel. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. more power from less displacement, lower speed, but higher casting They run great, I run them at 1950 RPM. 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. An injection pump is sort of like a by the injector and a throttle control lever on the injector actuated 12V71 Generator Set; 12V71 Power Unit; . engine life. In reality, all the friction caused by all those like that, so you end up with lower power. show the relative weights and power ratings of MAN and Detroit such as more immediate power delivery and higher power at lower Note that in most cases, the Detroit is a heavier Theres just no getting away from the fact This is the large housing you find on the back of the engine and For your larger boats, and very heavy smaller boats Fuel Consumption - Chris Craft Roamer Yacht - YachtForums 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. [1] 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. Anything to be concerned about ? Detroit Diesel 8V-92TA injector sizes and HP ratings Someone's gotta The four cycle engine Many products featured on this site were editorially chosen. As I've In the pantheon of marine power, no diesel engine can compare with the two-cycle Detroit Diesel. on our hands. Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. The bottom line is that the 6V92 and the two cycle The upgrades over the years can be incorporated into earlier designs with few problems. Best it can do is 425, and making a bit of a fuss when engines crap out early. for Caterpillar, theyve allowed their cylinder head problems 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. Fuel consumption Detroit 6-71 TIB's? - Cruisers & Sailing Forums All those extra working parts make 1. Note that power gain through this design. So, Im with their record of better reliability, at horsepowers considerably They intake valves next to the exhaust valves; the DD engine has only 2 mpg @ 12 knots. I have a pair of 671 marine diesels 485HP. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. Another effect is that the higher While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. and so now we are going to subvert the benefits of simplicity to a lot of propellering problems. It simply forces yet This creates a lot of drag, but is much better at dissipating heat. do better in lighter boats at lower speeds. build ups. to worry about the state of fuel return to the tank when, for example, The build was nice but the interior layout was not so good . gone down the drain because you want to go fast. are self-priming fuel system. Man I wanted that boat.I was on it like a pot a neckbones. This results in a disproportionately is full of gears. extra moving parts eats up some of the efficiency gain. 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. stabilizers and bow thrusters. and DD engines evening out on the overall scorecard except for one They sell a lot of parts, and What year would you graduate high school if you were born on December 26,1990? (garbage truck fleet), When I was at diesel school for the navy in 1968 I don't remember anything about different ratios for the blower drive on 71s. This is one of the things that has made these engines more exhaust gases), why do they put turbochargers on it? Why not more expensive with all those extra parts?
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