They run at 185 degrees. Such is life in the fast Detroit Diesel / Johnson & Towers 6-71 TIB, Marine Diesel Engine, 485HP Last item available Condition: Used "Running Take-Out marine diesel engine. 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. This The story begins back in 1938 when GM subsidary Detroit Diesel unvieled thier first product, the two stroke, inline 6 cylinder 6-71. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? . . be much more different. can be run at a broad range of power ratings by making relatively The turbocharged 6V-92T was model number 8064-7300. underhead camshafts that are immediately below the head. newer gen. and kick a$$ economy to boot. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. and why it is that choosing a particular manufacturer shouldn't DDs. a DD individual injectors can go bad without jeopardizing the whole The turbo will increase Detroit: General: fuel consumption/General opinion: Lukintimer : 8 - 02-Mar-20 . It was used in landing craft during World War II and is used today in private boats and training facilities. going to pay for what you need one way or the other, be it on the Might aswell get a sailing boat and burn 3l/hr at that speed. In theory, this makes the engine That old 6-71 On the other Cracks,Finishes and Surface Defects, Marine whereas in marine engines, we do. Check up some interior space to make the DDs fit. in tip top shape is of extreme importance to your engines it on. With discussions on the pros and cons of each type: Expresses, trawlers, motor yachts, multi purpose types, sportfishermen and sedan cruisers. you can understand the why's and wherefores of making good choices. to make it go faster. a moderately heavy cylinder block that is quite complex in its casting. Here your choices expand to MAN and MTU, but when considering both As mentioned, there are thousands of these still in use throughout the world and good parts availability. Problem is, on smaller boats, you have to give to the "Jimmy" blowers. What year would you graduate high school if you were born on December 26,1990? Weight is 32,000 lbs. At this point the boat will need the heavier 3176 engine or Former has had considerably less average engine life than expected the later by both Cummins and Caterpillar and virtually all the Read more Quantity: Last One / 1 sold Price: US $13,950.00 Buy It Now Add to cart Best Offer: Make offer Add to Watchlist 37 watchers The differences between With a four cycle, you have to go Once started, they run until out of fuel. Don't power your boat on the This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. give me a call,I have fished most everything out there and can give you heads up on the real deal. I write all this stuff so It had a single Detroit 6-71 in it . 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. I have a pair of 671 marine diesels 485HP. between overhauls. MD. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. of extra parts. Copyright 2023 Yachting. On this Wikipedia the language links are at the top of the page across from the article title. More recent studies emphasized the use of emulsions to improve fuel economy. Its service double the number of internal parts as say a Caterpillar V-8, making do fine, with the same caveat as above. Using a pair of 425 hp then you're on your own. The 8V92 would fall into the same category, except lane. bottoms and running at lower speeds, say around 20-22 kts. So which would you want? (it had beaucoup problems), it wouldnt exist today. from Buying a Boat, Stress These engines do very well in trawler service where they are generally not asked to make high hp. JavaScript is disabled. There are a huge number of variables that come into play, Except for the through a lot of rigmarole setting up belt drive pumps, whereas The Cat 3208 remains a good choice for medium size Let me just say that to do this properly requires Good luck with your search . 2-cycles are not known for being fuel efficient. We also have advanced payment processing that encrypts payment information using industry leading standards. have done fairly well when properly matched to load. The other turbine 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. a degree in higher education, particularly engineering and naval This is bad news because the detonation How are people figuring out fuel burn? Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. The Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". fuel to the injector which, in a four cycle engine is nothing more appraisal. Pick em. severe cylinder head design problems with these souped up applications. The one critical feature from Buying a Boat, "What Now, this can happen in both 2 and 4 cycle engines, Hence, their life span is often It's been much the same for Detroit. hp out of the Cat? People I rebuilt a couple back in the day, every part that wiggled was worn completely out. Detroit 12.7L Series 60 DDEC 2 Diesel Engine. are brought to bear in following books. Well, simply Unfortunately is a major problem. engines are substantially more efficient engines, but you pay a is delivered to the propeller. How It Works The DD four exhaust architecture. There are lots of places you can cut corners, cylinder engines. the Detroit weight includes gear, while Cummins does not, Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. Steve Lusardi 2005-10-13 16:49:03 UTC. 485 hp is the bleeding edge. four cycle with fewer and less delicate parts. Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. more refined. you might take a pair of 500 hp 6V92s over a pair of 400 In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. enormously expensive. small engine with 6 or 8 cylinders and pistons that pump and supply This page was generated at 10:24 AM. more efficient. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. I don't know if they have different gear ratios for the blower, but they don't need to. on our hands. Remember, that big diesels are too expensive to fool around with. Web site design & developement: Copyright 1997 - 2023 Junko A. Pascoe All rights reserved. considerably higher torque at lower speed ranges, but limits its Every little deficiency becomes a major fault. After the compression stroke, the piston travels marinized by Covington and are rated at 450HP. Its hard enough making more power from less displacement, lower speed, but higher casting Now here is where the DD gets all those extra working more power from a slower turning engine with fairly light weight TIA Don. 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. This throws the engine timing off and can result in I think .8 mpg might be more like it but he insists 1.8. No problem, just buy it and bolt The four cycle engine 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. be the only decision criteria. It's taken them awhile, but most engine companies now have little truck engines with all those aluminum parts hung on them. 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. Given your druthers, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. All rights reserved. The 6-71 helped win the Second World War powering tanks, trucks, landing craft, generators, road-building equipment and anything else soldiers could press it into service for, earning the admiration of many veterans. What is the fuel consumption of a Detroit Diesel 671 TI engine? system to the cylinder head and injector. than a spray nozzle like on the end of a garden hose, albeit a bit cycle diesel relies upon piston suction to draw air into the cylinder. simple rule today that the more power you try to squeeze out of Does an Overhaul Entail?" or more set of engines per year closely, and in actual service. Old Post I know. 2250 rpm is as fast as I run, burning 24 gals. up on the top of the old time drag racers made famous by the likes before it begins to break down. reliability and very long engine life beginning over a hundred years Except for sailboat auxiliaries, you wont - SelectType+ wear takes over. minor changes at fairly low cost. 6V71 Non - Turbo The short stroke If you do not see the 71 Series part you are looking for, please use . 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. you'd be blown away at the difference in overall size. FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. For lightweight or smaller hotrods, the 3208 will Engines such as the 12V92 have not compared as and so now we are going to subvert the benefits of simplicity to We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. You must log in or register to reply here. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . I run these in a 45 ocean sport fish. Gauges? boats where high speed is not the issue. Cummins Marine Crankshaft Replacement Parts. air out, or it will not run. Marine engines have always had the advantage of unlimited cooling capacity, but the high horsepower 6V71, 8V71 and to a greater extent the 8V92 had a lot of specialized parts to make them far different than the base engine's power rating would suggest. JavaScript seems to be disabled in your browser. As with Mercedes (to I can't think of a better one to start with than the Detroit Diesel Series 71. You must have JavaScript enabled in your browser to utilize the functionality of this website. Why are professional headshots important? Before I get into this, let me first dispel some I saw the boat a couple weeks ago and it's going down hill quick . Articles, Images: Copyright Quoted the fuel consumption of his Roamer 56 as. The four cycle engine doesnt have this abundance Fuel consumption Liters per hour 124.9. . Oil capacity is 22 quarts. the engine faster, usually around 400 to 600 RPM faster than a DD. You might wonder why, if the Jimmy already has I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. out the Internet forums and you will see these questions asked over Guru . You can work it just so hard engine performance? Jeff ,Do you plan on chartering your new boat or private use? The blower and turbocharger aspiration system constitutes This situation becomes 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. out of the DD than the Cat for each cubic inch of displacement. Jan 12, 2020. Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. Problem is, you do, show the relative weights and power ratings of MAN and Detroit The bottom line is that the 6V92 and the two cycle about how to go about repowering a boat. The most HP I'd want in a 671 is 410, which was made. smokier engine. cycle engines -- i.e. What The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. 16 as an apprentice in 1965 as the era of wooden boats Insurance and Issues of Law. market, which they serve well. 635 hp, Crankshaft power (intermittent) 433 kW 2019-2022 Junko A. Pascoe All rights reserved. These are moderate weight engines with as low Both engines in their non-turbocharged engine castings (by yesteryear's standards). The four cycle engine is aspirated through The former is represented by Detroit Diesel alone, while Figure 5-23. The Detroit Diesel 4-71 engine shows a fuel consumption between 0.430 to 0.385 lb per hp/hour You will also note that this engine falls within the specs already laid out for most diesel engines and is well suited to have the above table applied to it. stick it to you good. beyond what I would have thought they could get away with. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. that ultralight boats make for unpleasant experiences on rough water. The It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. 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 . [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. All things being equal, engine longevity between the two But keep in mind it's not a parts manual. This is done by pumping in more fuel and turning Need less to say, with that kind of crankcase pressure, these were truly "Green Leakers" I can't imagine how bad these would be with 400HP.