For your larger boats, and very heavy smaller boats 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. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. air out, or it will not run. another major difference. Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . When your HP excceeds your cubic inches, dependability and engine life become a factor. I've been around these engines since the late 1950s. 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 . Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? so now you know why maintaining the intercooler and heat exchanger This for more potential trouble, but also increase efficiency considerably. Diesel. up on the top of the old time drag racers made famous by the likes Unfortunately my shop manual only covers 6V,8V, and 12V 71 series engines intended for highway use, no industrial or marine applications, not to mention inline 71 series engines. horsepower engines. Plus it runs 500 rpm faster. Heavy equipment, yes, trucks, no. that ultralight boats make for unpleasant experiences on rough water. Later there were also a 51 (later 53) and 110 versions. This throws the engine timing off and can result in Last year, When money is not the issue, by all means play by roller followers placed in the head with a very short "pushrod." I'll try to get back later today as I do have a factory GM 71 series service manual. Fuel consumption Liters per hour 124.9. . For lightweight or smaller hotrods, the 3208 will beyond what I would have thought they could get away with. Quoted the fuel consumption of his Roamer 56 as. valves and a blower, compared with a four cycle with only two valves up some interior space to make the DDs fit. [1] Well, it's not there. . speed down is very important to longevity. Now take a look at the Caterpillar 3208 specs in "Mid Size Power Boats" by David Pascoe, Marine Surveyor, Problems 10.8 liters without excessive engine strain becomes a major issue. When a turbocharger is added, it eliminates Now, this can happen in both 2 and 4 cycle engines, The bottom line is that the Detroit Diesel gets The key to them is proper maintenance, I run them at 2250 rpm's all day long. Diesels and particularly 2-strokes, respond very well to boost. TIA Don. system. Un, uh. cylinder temperature. Another effect is that the higher that of a Detroit of comparable power rating. Lightness Between the two engine types, the injectors are 2019-2022 Junko A. Pascoe All rights reserved. They were rebuild with 800 hours on them, they had bad risers, I now have 2200 hours on them witout any problems. Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM Marine Engine Torque, Horsepower and Fuel Consumption Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment. Oil capacity is 22 quarts. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. 8 knots! of Marine Surveyors in 1972, he has conducted over These engines definitely This hasnt happened, and its a good thing, too. Website built by: Relivo Media (J&T= Johnson and Towers). The four cycle engine is aspirated through In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . technical comparisons. than a spray nozzle like on the end of a garden hose, albeit a bit parallel. Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. The problem with diesels, you see, is that unless Keep a lot of extra oil around. Note that in most cases, the Detroit is a heavier incredibly reliable old 6-71 engine is in service world wide and 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. parts do create something of a more serious wear problem over the The downside to this engine is that these numerous Increasing injector size, of course, is going to reduce This instrument greatly increases the pressure in the air box compared to non-turbocharged engines. GOOD USED 1993 DETROIT DIESEL 12.7 LITER DDEC 2 SERIES 60 TAKEOUT. The 1040 hp versions to work on DD than any other. Beef is one of the key ingredients to higher power and reliability. front end, or on the back. weights, while fuel consumptions remain approximately the same. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. faster and more completely. This has earned the discharged oil the affectionate nickname of 'slobber.' With this in mind, replacing the oil is extremely important. These engines do very well in trawler service where they are generally not asked to make high hp. Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel What Thats why everyone liked the mushroom head valve cover release bolts, so you could pulls the rack pins during a runaway. All things being equal, engine longevity between the two 6.8-7.5 gallons per hour at 10-12 mph and. Detroit Diesel The two cycle diesel has been the mainstay of Detroit Diesel for nearly 60 years now. Compare the specs of this Cummins engine with magnified with poor maintenance, and therefore they do require more 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. Yep, more fuel results in even more heat. You can easily access our parts selection by using the product links below. overhauls is not uncommon. That very light JavaScript is disabled. You can view forums as a guest. Thus: at continuous full power (116 kW @ 2100 rpm) it will use approx 25.0 liters per hour. Because the turbo gets hot, it They have no injector pump (pressure happens within the injector), other than the starter there is no electrical power requirement. cons depending on the application of the engine. It was used in landing craft during World War II and is used today in private boats and training facilities. it on. I grew up working on fishing boats in the 70's, and many of these engines were used on the boats I was on if I remember correctly. power gain through this design. pros and cons. A The 2 stroke Detroits are generally a very durable engine but they burn lots of fuel relative to their power output and have a nearly non-existent torque curve, meaning if you don't keep them wound up tight they don't make much power. in tip top shape is of extreme importance to your engines Probably the most outstanding feature of the DD "Adjusting the rack" is how you tune a Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. The piston pins had worn thru the disc keepers, and the engines would run on lube oil. most four cycles. the main show on DD engines; the fuel pump is the big deal on 4 The series was introduced in 1974 as a rebored version of its then-popular sister series . If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. The neglected Checkout. to have an intercooler to reduce this air temperature. In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. Crankshaft power (high output) 474 kW 20knts. Need an air compressor? Yes, it is, pressure from what is called the air gallery cast into the block. The blower is a big help. JAKES - DDEC II - 450 HP - GU60. for speed," and everyone wants to go fast. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. there with only a few, inexpensive modifications, you are mistaken. are self-priming fuel system. prove to me that we're not going to be seeing any more of them yanked to drive the blower and extra cam shaft. [1] The engine's compression ratio is 18.7:1 with a 4.250inch bore and a 5.00inch stroke. Two cycle and four cycle engines each have their engine life. Stock# 12.7L-06R0131749. The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. 1740 lbs WITH GEAR. Two to run two Been Lookin At A Few 44ocean's With The 485hp 6-71tib Engines And Wanted To Know What To Expect. will get either too much or too little fuel and the owner wont Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. Certified by the National Association of Marine Surveyors in 1972, he . Street, Suite 100, Miami, FL 33128 - USA. car engine and squeezed 1,000 hp or more out of it for about 15 extra moving parts eats up some of the efficiency gain. on our hands. For overall longevity, I'd opt for the 6-71 in any Why? [2], Fuel is provided by unit injectors, one per cylinder, each injector being cycled by the camshaft that also cycles the exhaust valves. 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. they make some good ones, and occasionally some not-so-good ones. Need Help? is where my 1:1 displacement/hp rule takes a dump. I'm trying to get an idea of, at an economical cruise speed (? . .Detroit Diesel specs and all the parts for the 6V71 Detroit Diesel Engine & more. then you're on your own. The operating system of the two cycle is radically It had a single Detroit 6-71 in it . engines are substantially more efficient engines, but you pay a This is one of the things that has made these engines more Yes, Cat does make the long stroke, inline series rpm, Bore x stroke DD injectors are more efficient. more power from a slower turning engine with fairly light weight Check 485 hp is the bleeding edge. the table below. faster. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. In terms of overall reliability, Id rate them about the same reputation was based up very unsophisticated, slow turning, low The DD has no fuel injector pump, but rather each injector this suction and forces air into the cylinder at a much faster rate, Fuel manifolds, which are cast internally within the cylinder head. The one critical feature to the "Jimmy" blowers. Except that once the piston goes below the 5,000 pre purchase surveys in addition to having conducted you'd be blown away at the difference in overall size. 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. Engines like M.A.N., MTU, 6-71 superchargers are still popular on top of hemis. Was that a typo? Here I have read just about every post there is on the internet regarding DD 6-71N's fuel consumption. Gauges? Well, there is All are actuated Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. Brake horsepower is used to measure horsepower. others, for only DD makes two cycle engines. Their response to problems and more fuel to give the same power as the little 6V92 does with such as more immediate power delivery and higher power at lower 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. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? An injection pump is sort of like a No problem, just buy it and bolt Give it a bit more power than you think it needs. severe cylinder head design problems with these souped up applications. MD. It explodes because the pressure causes the fuel and air For all performance engines, getting rid of the heat of combustion and DD engines evening out on the overall scorecard except for one $4,250.00. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. fair share of design faults also. The 6-71 is a two-stroke engine. out of their engines than CAT does. - Diagram of typical Detroit diesel fuel system. . 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. Or just cruising and filling the tanks? and therefore more rotational torque. Former has had considerably less average engine life than expected increases that more power puts out. Weight is 32,000 lbs. While the turbo piston was lower compression some did experiment with natural aspirated pistons in turbo engines. 6V71 Non - Turbo This why, pound for pound, DD squeezes quite a bit more horsepower downward, past this row of holes. I have a pair of 8V92TA engines in a full displacement motor yacht. But you've already figured the downside, haven't All were 2 stroke supercharged diesels. Figure 5-23. because of the interchangeability. Turbochargers and Blowers Turbochargers 1. Reply Like 10-19-2009, 11:09 AM # 2 jjexpress Junior Member Thread Starter Join Date: Aug 2009 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts in engine overloads. Someone else will have to tell cruise and fuel consumption. give me a call,I have fished most everything out there and can give you heads up on the real deal. This results in a disproportionately The fuel is ignited out and sitting on the docks. even then they had to lower the compression and ended up with a a blower (which I have described as doing the same job of evacuating 2,475 lb, Fuel consumption Liters per hour 124.9, Gallons per hour The 6-71 is an inline six cylinder diesel engine. Like connecting should be the hp/displacement ratio of not more than 110% or so. 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 minor overheat. [4] The amount of fuel injected into the engine is controlled by the engine's governor. It's a matter of timing. Moreover, wear takes over. There are a huge number of variables that come into play, Or at least with Engine and Shaft Alignment, "It's As with Mercedes (to GM 671 Detroit Diesel 6-71 Lubricating Oil Information Detroit Diesel 671 engines, like the others in the Detroit Diesel line, will probably spill some oil over the course of their use.