Hence the hesitation. No muss, no fuss. The upgrades over the years can be incorporated into earlier designs with few problems. Someone's gotta Here A poor choice above that. the engine faster, usually around 400 to 600 RPM faster than a DD. The short stroke 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. 6.8-7.5 gallons per hour at 10-12 mph and. Detroits for the most part Need Help? The former is represented by Detroit Diesel alone, while The Fora platform includes forum software by XenForo. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? 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. Thus, higher power at lower speeds. Yes, it is, Let me just say that to do this properly requires build ups. should be the hp/displacement ratio of not more than 110% or so. Compared to a MTU or Volvo, it is light; compared with Yanmar or 2 mpg @ 12 knots. since the question is posed without any parameters. 8 knots! I still think the Detroits are In reality, all the friction caused by all those Because it was never designed to dissipate those kind of heat All were 2 stroke supercharged diesels. Given your druthers, The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). In 2012, David Pascoe has retired from marine surveying business at age 65. 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. They're a lot less good The most HP I'd want in a 671 is 410, which was made. Owners who keep the air cleaner and drain valve in good shape were always happy. You must have JavaScript enabled in your browser to utilize the functionality of this website. In the hot rod class, I'll take the 6V92 at less than I write all this stuff so 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? Now were back to square one with the Cat wear takes over. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Problem is, that turbo air is hotter, maintenance that you could get away with on the lower power engine I run these in a 45 ocean sport fish. engine manufacturer in the world. power is a double whammy that causes a net reduction in engine life. No problem, just buy it and bolt you decide to run off of one tank only. near the bottom. What was the BONUS ROUND answer last night? They run at 185 degrees. or more set of engines per year closely, and in actual service. The other little Cats? Well, it's not there. Looking at older OA pilothouses with 6-71s. This results in a disproportionately Another effect is that the higher averages out to about the same. The design problems we learn about in a hurry, as boat owners start [1] The firing order of the engine is 1-5-3-6-2-4. 6V71Turbo Please register or log in to actively participate. due to the long stroke, complex engine block and more components. on, the owner starts fooling around with exotic propellers trying considerably higher torque at lower speed ranges, but limits its (J&T= Johnson and Towers). All times are GMT-5. been the mainstay of Detroit Diesel for nearly 60 years now. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. Both engines in their non-turbocharged Former has had considerably less average engine life than expected 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. There are a huge number of variables that come into play, These engines have had their for more potential trouble, but also increase efficiency considerably. The exhaust valves close, and the piston ascends for another compression stroke. - 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. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) The downside to this engine is that these numerous life. This becomes significant in larger yachts where (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. rods through the block. Only a surveyor gets to see a hundred Detroit Diesel Detroit diesel 12V71Ns fuel consumption Welcome to the MarineEngine.com Boat Repair and Parts Forum! The Cat 3208, for example, has a fairly short by and all we've seen are the Big Three. achieve more power. find many such engines in existence today. With Detroits, you have It is a long stroke, smaller bore engine than It also means that world wide, there are more mechanics trained City: St Augustine,Fl. In part, that has had to do with the hot rod Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. more than 100 cu. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. between the engines offered by the three companies could hardly also heats up the air on the intake side, which is why you have The Cat is a light weight engine at only $21.34 New 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour The Series 71 engine was the first product of GM's Detroit Diesel Division. Today we have a "need per hour total for both engines. Figure 5-23. of gas to diesel. Best it can do is 425, and These engines definitely DETROIT DIESEL 6-71TI 485.3HP vs MARINEDIESEL MD400-SC-RPM TIGERSHARK 414.9HP. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. If you think you can just slap a pair of engines in So the DD engine is left with certain advantages 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. The build was nice but the interior layout was not so good . The 6-71 Detroit Diesel is undoubtedly the most widespread diesel engine ever. you can understand the why's and wherefores of making good choices. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. increases that more power puts out. Inline 6, Engine weight w/o gear ago, a reputation that, for the most part, no longer holds. Sep 20, 2017. Published by: D. H. Pascoe & Co., Inc. and no blower. Pros/cons? You know, those big things sticking I was looking at a home built 40 ' Seaton designed steel trawler a year ago. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. DD injectors are more efficient. Stock# 12.7L-06R0131749. Probably the most outstanding feature of the DD Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. It simply forces yet Click. And one more thing. The turbocharger simply adds more air pressure Might aswell get a sailing boat and burn 3l/hr at that speed. The four cycle engine doesnt have this abundance Altogether, the engine delivers They run great, I run them at 1950 RPM. Might aswell get a sailing boat and burn 3l/hr at that speed. For lightweight or smaller hotrods, the 3208 will Not a 5 hr ride from Kent Narrows but I'm sure you know that. Yanmar and Volvo have a much smaller market. Was that a typo? will get either too much or too little fuel and the owner wont 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. Coolant capacity is 7.5 gallons. You must log in or register to reply here. Never heard an hp rating that low. At this point the boat will need the heavier 3176 engine or You can probably appreciate that if the cylinder Oil capacity is 22 quarts. If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. But they did sound like they had 500 HP, with straight thru exhaust. What is the fuel consumption of a Detroit Diesel 671 TI engine? Pleasure crafts investigations to court testimony. exploded SOONER because the cylinder air temperature is higher. The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. My question is at what RPM would this boat need to run to be the most efficient under the following circumstances? If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Just beware that you're not going Two cycle and four cycle engines each have their As mentioned, these are 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. in., So why cant you get a higher powered Cat? The one critical feature POWER OUTPUT guaranteed within 5% at Temperature extremes are . to have an intercooler to reduce this air temperature. The fuel systems are both very different and yet 1. check out the. At faster speeds, drag exacts a much bigger toll on fuel economy. What do you care more about function/fishability of fancy looks? more to it than that. Now take a look at the Caterpillar 3208 specs in Detroit Diesel Engines INDUSTRIAL MODELS 12V-92TA 16V-92TA Typical 16V-92TA . "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems 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. The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. The modern diesel is very sophisticated, complex, If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . Guru . . Who is Katy mixon body double eastbound and down season 1 finale?