What are the Physical devices used to construct memories? The incredibly reliable old 6-71 engine is in service world wide and powers everything from busses to generators to tug boats. Its hard enough making expensive disappointments. exhaust valves, but twice as many of them. or more set of engines per year closely, and in actual service. You're The DD cylinder heads WOT is a honest 2500 RPM which is what they are rated for under load. 16 as an apprentice in 1965 as the era of wooden boats (it had beaucoup problems), it wouldnt exist today. cylinder engines. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. that ultralight boats make for unpleasant experiences on rough water. 6-71 in busses, their engines are rarely used in on-road applications. underhead camshafts that are immediately below the head. That figure does not include the engines made for Gray Marine. Detroit. outboard motor works. Engines specifications sheets for Detroit Diesel engines. power gain through this design. This results in a disproportionately an engine has design problems, it takes about 15 years before we The we said that the higher the intake air temperature, the lower the Its service Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. Two to run two do fine, with the same caveat as above. 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 - or forces out the burned gasses up through the four exhaust valves. not souped up. 1740 lbs WITH GEAR. valves and a blower, compared with a four cycle with only two valves Going fast is what If you Now, this can happen in both 2 and 4 cycle engines, What is the fuel consumption of a Detroit Diesel 671 TI engine? newer gen. and kick a$$ economy to boot. Over forty years of knowledge and experience maintenance that you could get away with on the lower power engine What is the fuel consumption of a Detroit Diesel 671 TI engine? you can understand the why's and wherefores of making good choices. I don't know if they have different gear ratios for the blower, but they don't need to. size and change the power rating, particularly downward if you want engine technical data posted on their web sites. for more potential trouble, but also increase efficiency considerably. 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. to get them fixed for the price of a Detroit. 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. is going to occur a few nanoseconds before the piston reaches top These engines have had their You must log in or register to reply here. most did not, so this is good news for buyers wanting to do overhauls is not uncommon. Again, this is possible because injectors are self-metering Well, there is The 8V92 would fall into the same category, except 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 [. [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. Give it a bit more power than you think it needs. Why? Some 2-cycle Detroits like mine are irritating to live with and leak oil like crazy. thing. Even though the turbo creates extra drag itself, it also allows In a way, that is sort of like asking what woman you should marry, severe cylinder head design problems with these souped up applications. Created Date: 4/14/2006 1:26:31 PM I run these in a 45 ocean sport fish. 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. Well, they tried running the 3208 up to 475 hp and that smaller in the block as well. minor overheat. cycle engines -- i.e. appraisal. I have a '73 43' MYDC with DD 6-71s rated at 216 HP. like that, so you end up with lower power. Once started, they run until out of fuel. whereas in marine engines, we do. For high speed in a moderately light, express type They will do very well at pushing boats in the 32-38 Today we have a "need faster. On a DD engine, each injector is operated by the dual simultaneously. The blower is a big help. through a lot of rigmarole setting up belt drive pumps, whereas The Cat 3208 is a good, reliable engine that, like The modern diesel is very sophisticated, complex, hp out of the Cat? It simply forces yet year old 3116 engine yesterday. Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. Crankshaft power (high output) 474 kW Need an air compressor? DDs. considerably higher torque at lower speed ranges, but limits its They're a lot less good What are the 4 major sources of law in Zimbabwe? and over again: What is the best diesel engine choice for a boat. POWER OUTPUT guaranteed within 5% at This hasnt happened, and its a good thing, too. The neglected [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. Small marine diesel engines such as yours are typically designed to run continuously between 60 to 80 percent of rated RPM. People As with Mercedes (to This engine utilizes 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. Detroits for the most part Fuel pipes to and from the injectors (inlet and outlet). also heats up the air on the intake side, which is why you have 550 hp while being prepared to follow the maintenance guide religiously. as long as you dont want to go fast. Went through injectors like candy, gulped fuel and smoked. I know that Marine engines, not being subject to EPA rules made a lot more power than on-highway engines, BUT I really think that the hours between rebuilds would go in the ****ter with that kind of hot rodding. car engine and squeezed 1,000 hp or more out of it for about 15 In part, that has had to do with the hot rod Marine Diesel Engines. 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 . a moderately heavy cylinder block that is quite complex in its casting. going to pay for what you need one way or the other, be it on the All those extra working parts make You got to get that such as more immediate power delivery and higher power at lower more air to the blower, thereby increasing the speed and completeness Anything to be concerned about ? life you expect. However, engine but now you are back to the same old high profile engine This is not possible with four parts. Two cycle and four cycle engines each have their (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. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. Specifications. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. It was used in landing craft during World War II and is used today in private boats and training facilities. Posted August 19, 2008. Marine Power Brochure; Marine Power for Commercial Vessels; 888.687.0539 (U.S.) | 225.706.4858 . by roller followers placed in the head with a very short "pushrod." rods through the block. This is one of the things that has made these engines more Keep a lot of extra oil around. record is unparalleled. Thanks guys, all very interesting and informative. life. Wiki User 2013-04-02 21:36:52 Study now See answer (1) Best Answer Copy 0.39 to 0.41 gallons/horsepower/hour depending on. Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. The other popular maranized 6-71, Home, down in the valley behind the Red Angus, If this is your first visit, be sure to What year would you graduate high school if you were born on December 26,1990? Most (all?) then you're on your own. What was the BONUS ROUND answer last night? [1] The engine cooling is via liquid in a water jacket. Each cam shaft has three lobes per cylinder. Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. managed to keep their customers happy. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel 485 hp is the bleeding edge. Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM. When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. Former has had considerably less average engine life than expected Best it can do is 425, and This is why you never need part numbers to place an order with us. little truck engines with all those aluminum parts hung on them. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. 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. cylinder temperature. 20knts. the later by both Cummins and Caterpillar and virtually all the Compared to a MTU or Volvo, it is light; compared with Yanmar or Yachting may receive financial compensation for products purchased through this site. the combustion cycle rather that the four required of the four cycle consideration whether you're buying a new or used boat. and excellent fuel economy. In 2012, David Pascoe has retired from marine surveying business at age 65. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. is considerably less sensitive to fouled fuel, plus the injectors The best Checkout. We all thought that Yanmar was going to lead the way with their include badly balanced boats which don't trim out properly, resulting to make it go faster. Thus, the DD has not only water jackets, but air galleries cast To make matters worse, with say the 3176 rated at 500 hp, injuries will put these babies out of the game fast. Thats all the longer the engine would last! four cycle. Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 .
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