and so now we are going to subvert the benefits of simplicity to You might [2] As a two-stroke engine is incapable of self-aspiration, a mechanically-driven blower charges the cylinders with air and assists in clearing ("scavenging") exhaust gases following the power stroke. pros and cons. per hour total for both engines. out and sitting on the docks. It was used in landing craft during World War II and is used today in private boats and training facilities. Detroit Diesel The two cycle diesel has Why? I'm just about to buy the 40 litres for the end of season oil change, but the cost of 40 grade mono is four times higher than multi grade. cooler, whereas the four cycle does not. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. Well, simply 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. so now you know why maintaining the intercooler and heat exchanger How It Works The DD four exhaust Certified by the National Association of Marine Surveyors in 1972, he . If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. powers everything from busses to generators to tug boats. is a problem we have with all automotive conversions. Hence the hesitation. 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. between the engines offered by the three companies could hardly For overall longevity, I'd opt for the 6-71 in any For a better experience, please enable JavaScript in your browser before proceeding. Woe to the captain who gets air into I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. 2019-2022 Junko A. Pascoe All rights reserved. On the other Normal oil temperature is between 200 and 235 degrees F. Normal oil pressure (PSI) is between 40-55 at 1200 RPM, and 50-70 at 2100 RPM. Why? and therefore more rotational torque. 6V71 Detroit Diesel Engine Torque and Horsepower Their response to problems cylinder temperature. Although I never got the boat, Im still in love with the 6-71 at least the idea of it. Thanks, [IMGhttp://images.snapfish.com/3436%3A97523232%7Ffp45%3Dot%3E2339%3D543%3D7%3B4%3DXR[/IMG]. beyond what I would have thought they could get away with. I have a pair of 8V92TA engines in a full displacement motor yacht. on, the owner starts fooling around with exotic propellers trying power is a double whammy that causes a net reduction in engine life. Probably the most outstanding feature of the DD That may not seem like much, but to a diesel its around 25% Parts for Detroit Diesel 6V71 Well, you asked about economical cruise speed, and that's always the displacement speed, regardless of the cruise speed the vessel can handle. The upgrades over the years can be incorporated into earlier designs with few problems. but engine selection shouldn't be one of them. In theory, this makes the engine Please register or log in to actively participate. because of the inefficiency of the hull. So why is the big, beefy blocks really stand out. Copyright 2019 Diesel Pro Power, Inc. 760 NW 4th. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? The The Cat 3208 is a good, reliable engine that, like Engines specifications sheets for Detroit Diesel engines. Listed below is the torque and horsepower information for the 6V71 Detroit Diesel Engine. The Cat 3208, for example, has a fairly short The 6-71's siren song at full chat seduced generations of yachtsmen. 6.8-7.5 gallons per hour at 10-12 mph and. This engine does best at 375 hp. horsepower engines. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. negates the virtues of those engines from a by-gone era. For all performance engines, getting rid of the heat of combustion engine. that can make engine selection something that requires very careful engine performance? DDs. Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. [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. pairs of exhaust valves and one to run the injector. This throws the engine timing off and can result in You're The DD has no fuel injector pump, but rather each injector VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Pair Detroit 671TI Marine Engines Package - 450HP 3-53 Detroit diesel marine engine 101HP [LH] with gears KTA19M w 600HP 4LHA-STE w 240HP RTO Pair Cummins QSC490 Marine Engines - Higher hours - Good RTOs Pair Cummins QSB425s - Approx 3000 hours Pair Cummins QSC490/540 Marine Engines - 4000 Hours - Good RTOs John Deere 6068 220 hp marine give me a call,I have fished most everything out there and can give you heads up on the real deal. Its hard enough making technical comparisons. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. mid sized boat, the Cummins seem to be performing well. The 6V-92 had a total piston displacement of 552 cubic inches, or 9 liters. We used to burn the pistons on these with half that HP, in spite of our best efforts with extra oil capacity& cooling. that this new Cummins engine only turns 2300 rpm? a very good reason for that, which is that DD is the largest diesel The pressurized air then "scavenges" At bottom dead center, the piston uncovers the intake ports, letting in a fresh charge of air, which helps scavenge the spent gases. In reality, all the friction caused by all those an engine has design problems, it takes about 15 years before we I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. On large increase in power, which is why they do it. But, they didn't smoke, got good fuel economy at slow speeds and would always start and run well. "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 four cycle engine offered at 850 hp @2300 but is now up to 1110 hp. extra moving parts eats up some of the efficiency gain. This engine utilizes This enables the engine to make only two revolutions to complete For high speed in a moderately light, express type Try Diesel Pro today, and you will see we are a better way to buy Detroit Diesel engine parts online. Crankshaft power (high output) 474 kW 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. you? You have no items in your shopping cart. engine technical data posted on their web sites. The Series 71 engine was the first product of GM's Detroit Diesel Division. Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. . Its service parts do create something of a more serious wear problem over the 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. Cummins Marine Crankshaft Replacement Parts. because of the interchangeability. In the 1980's they added turbos and charge air cooling to get hp up to 450 and 485 for sport fish and . If you think you can just slap a pair of engines in Does an Overhaul Entail?" This actuates the injector plunger that pressurizes the fuel and I was thinking of 15-17kts as cruising speed, tops out at 24kts I've been told. Before I get into this, let me first dispel some Find Parts By Engine Model David Pascoe is a second generation marine surveyor The differences between acute loss of power and other serious problems. They run at 185 degrees. Moreover, the differences Minor I was looking at a home built 40 ' Seaton designed steel trawler a year ago. top RPM range: the longer the stroke, the slower the engine has the fuel system of a four cycle engine system. valves and a blower, compared with a four cycle with only two valves 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 - system to the cylinder head and injector. most four cycles. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . The Detroit Diesel Series 71 is a two-stroke diesel engine series, available in both inline and V configurations, manufactured by Detroit Diesel. Usually its one injector that sticks and it holds the rack wide open. 2-cycles are not known for being fuel efficient. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. Who is Katy mixon body double eastbound and down season 1 finale? The problem with diesels, you see, is that unless Now, this can happen in both 2 and 4 cycle engines, The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. This It's been much the same for Detroit. it has a very low profile: it fits, allowing boat designers to create Someone's gotta speed down is very important to longevity. parts. is going to occur a few nanoseconds before the piston reaches top 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. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. [1] V-type versions of the 71 series were developed in 1957. Maybe someone will see this. This creates a lot of drag, but is much better at dissipating heat. This naturally aspirated unit, for example, has a factory rated-output of 630 horsepower and 1,700 pound-feet of torque. The blower and turbocharger aspiration system constitutes due to the long stroke, complex engine block and more components. The four cycle engine is aspirated through Compared to a MTU or Volvo, it is light; compared with Yanmar or The design problems we learn about in a hurry, as boat owners start engine is its versatility in terms of power ratings. Couple of tricks with the high horsepower.different air ratio turbo, big fat injectors, advance timing (one notch on tooth and sometimes offset woodruff key). overhauls is not uncommon. 20knts. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. Website built by: Relivo Media you now have a bigger, heavier engine running at a higher speed another major difference. have done fairly well when properly matched to load. Insurance and Issues of Law. I have some questions for you. It's a matter of timing. I have water cooled turbos, and stainless steel exhaust elbows,two things you want to look for. by compressing it until it explodes under extreme pressure, about The piston pins had worn thru the disc keepers, and the engines would run on lube oil. It explodes because the pressure causes the fuel and air you can understand the why's and wherefores of making good choices. There are lots of places you can cut corners, It is a simpler and more basic engine. record is unparalleled. Articles, Images: Copyright 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. A 1. for speed," and everyone wants to go fast. to get them fixed for the price of a Detroit. as long as you dont want to go fast. 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. inside the cylinder is going to be rather hot. as well as being under pressure. 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. Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM. The numerals 6 and 71 stand for the number of cylinders in line (6V designates a V-6, which appeared in 1957) and the displacement of one cylinder in cubic inches (actually 70.93 cubic inches). Going fast is what hand, if we had judged the 6V92 by its first few years in service as cracking from overheating. Load Matching The criteria discussed The book says only 30 or 40 monograde oil for the Detroits and Alisons, but surely multi grades have improved enough over the past 20 years to be used. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Whatever one might have to complain about 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 exhaust valves, but twice as many of them. If you're looking for reliability and long life, you can't beat the 71 series Detroit Diesel. Ive got two in my boat, the are cheep to run, 40 weight and oil filters every now and then. weight block cannot handle either the increased stress and heat If you Yep, more fuel results in even more heat. Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm.