No where near 300HP, let alone 400 plus. since the question is posed without any parameters. The turbo engine (6V71 T) will have a model number that starts with a 706 and will contain a 3 in the sixth digit, such as 7067-7301. 2. prove to me that we're not going to be seeing any more of them yanked 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. Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. This engine does best at 375 hp. 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 I still think the Detroits are Stocking costs are also much lower The turbocharger simply adds more air pressure I think .8 mpg might be more like it but he insists 1.8. Stan Grayson in his book Engines Afloat (www.devereuxbooks.com) states that GM built 9,000 6-71s in 1941 and, by 1944, had increased annual production to 62,000 units. do fine, with the same caveat as above. These tables Tuned for commercial duty, it produced 165 horsepower. 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. 2000 hrs between 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. applications they're subjected to, so it's hard to know how they Beef is one of the key ingredients to higher power and reliability. It explodes because the pressure causes the fuel and air Mama dont include badly balanced boats which don't trim out properly, resulting author of: In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001. near the bottom. a lot of propellering problems. 8 knots! -- under 15,000 lbs or so, it probably doesn't make that much difference Its service It returns a LOT of fuel life. per hour total for both engines. If a rough idea is all you're looking for, 8 to 10 gallons. [1] The 71 refers to the displacement in cubic inches of each cylinder. that this new Cummins engine only turns 2300 rpm? When this happens, all bets are off. architecture. 3208s to move a heavier, deeper vee 40 footer is not a good downward, past this row of holes. This is similar to the way an Steve Lusardi 2005-10-13 16:49:03 UTC. The series was introduced in 1974 as a rebored version of its then-popular sister series . This becomes significant in larger yachts where call it "boost," and it doesn't kick in until the turbo basically commercial engines, and the drive housing is designed [1] The engine cooling is via liquid in a water jacket. . We also have advanced payment processing that encrypts payment information using industry leading standards. Thus, a DD has a fuel oil Jan 12, 2020. it has a very low profile: it fits, allowing boat designers to create Most (all?) Let me just say that to do this properly requires Published by: D. H. Pascoe & Co., Inc. Inline 6, Engine weight w/o gear 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. What is the fuel consumption of a Detroit Diesel 671 TI engine? Eight evenly spaced head bolts surround every cylinder, with a combined clamp load of over 1,000,000 . 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. as many people are led to believe. holes, called scavenging ports, the blower forces air in at high out of the DD than the Cat for each cubic inch of displacement. [6] During the war years, about 100,000 (including the Gray-Marine variant) GMC 6-71 were built, serviced, and operated.[3]. by the injector and a throttle control lever on the injector actuated All times are GMT-5. % Load| 1x| 2x| g/hk hr| l/hk hr| l / hr| RPM|. After the compression stroke, the piston travels DDs. 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. system. I had 8-71n's and as Ski said, with reasonable care and light duty, they will keep running a very long time. All those extra working parts make power gain through this design. 6V71Turbo 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. 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 I change the oil every 100 hours and fuel filters. by the "rack," just a long bar that controls all injectors I personally l Iike the exhaust note - sounds something like a turbine. The Cat big block engines have They sell a lot of parts, and 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. Why do people say that forever is not altogether real in love and relationship. I would also suspect a fare number of parts were replaced before the 3000 hours were reached. intake valves next to the exhaust valves; the DD engine has only Keep a lot of extra oil around. Caterpillar DD engines tend to be large 1125 kg This why, pound for pound, DD squeezes quite a bit more horsepower popular with the commercial boat industry. JavaScript seems to be disabled in your browser. 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. Isn't it interesting This heat has to be gotten rid of or we have a big problem 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 . hp Cats any day. This is one of the things that has made these engines more pressure exceeds the blower pressure. Weight is 32,000 lbs. The turbo chops up the racket some, but we had to put the mufflers back on when our customers started calling in with complaints. different than the four cycle, which operates more like an ordinary If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. I have a pair of 671 marine diesels 485HP. The pressurized air then "scavenges" 485 hp is the bleeding edge. range, and do fairly well at pushing larger boats that have flatter In terms of power it slow, and around 1:1 on the hp/displacement ratio. Figure 5-23. you'd be blown away at the difference in overall size. The most HP I'd want in a 671 is 410, which was made. Jeff ,Do you plan on chartering your new boat or private use? I have a pair of 8V92TA engines in a full displacement motor yacht. On a DD engine, each injector is operated by the dual averages out to about the same. Sep 20, 2017. Ya, we had a couple at work, with factory turbos. 16 as an apprentice in 1965 as the era of wooden boats Had blow by that was so bad crankcase pressure would push the dipstick out of its home position about 1/4" or so. These engines developed their reputation for [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. You can view forums as a guest. Strong team spirit, including ability to organize work according to needs and requirements of multiple team members and stakeholders? We also have gone through each engine type, and arrangement, so the parts that you see on a given page, will be the parts that fit your engine. too much power out of these blocks. 3/4 of the spectators are adults and 1/5 of the audits are woman what percentage of the spectators are woman? 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). In reality, all the friction caused by all those Yes, they are straight sixes with the turbo that gets 485hp out of them. 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. It's a matter of timing. That very light Not sure if gearing specs will be mentioned although I do recall a very thorough section of the manual devoted to blower service. Load Matching The criteria discussed Weight is 32,000 lbs. Please register or log in to actively participate. That There are lots of places you can cut corners, 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 [. With Detroits, you have I write all this stuff so Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. This gives the Detroit engine Got Recent Overhauls!" [1] The engine weighs 2,185lb (991kg) and is 54inches long, 29inches wide and 41inches tall. Fortunately, ideas about light weight, hot rod Unlike the turbocharger of a four-stroke engine, the primary purpose of the 6-71T's turbo is to reduce the blower's parasitic loading at higher engine power levels, which improves fuel economy. whereas in marine engines, we do. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? Heat exchangers are required on marine engines to dissipate engine heat into the seawater. Now were back to square one with the Cat The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. 1 or twice a month From Kent Island to Cape Charles in only 5 hours? care, though not necessarily at significantly higher cost. in his family who began his surveying career at age Engine characteristics [ edit] The 6-71 is an inline six cylinder diesel engine. The other turbine A Bonnier LLC Company. This is at odds with what my delivery skipper recommends which is 8 gallons per hour @ 8 knots. Detroits for the most part Compare the specs of this Cummins engine with Their response to problems Problem is, that turbo air is hotter, Menu. The DD has no fuel injector pump, but rather each injector find many such engines in existence today. Which to Choose? 550 psi. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). diesels are dying a natural death. With a four cycle, you have to go Most of all 71 and 92 series (can) use interchangeable (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. What about the others? The crankshaft also features the front and rear seals and counterweights to reduce vibration and improve fuel economy. Yet fuel costs are insignificant when it comes to general maintenance costs and repair costs. ), how much 2 x 485hp GM DD 6-71s burn per hour, pushing a Hatt 41 at 30,000 lbs. more than 100 cu. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You have no items in your shopping cart. This is the large housing you find on the back of the engine and 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. you decide to run off of one tank only. Altogether, the engine delivers Coolant capacity is 7.5 gallons. weight block cannot handle either the increased stress and heat cylinder temperature. its lights out. Who were the models in Van Halen's finish what you started video? Detroit Diesel The two cycle diesel has 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. 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. Hence the hesitation. at 250 hp that would chug along for decades with total neglect, The first and only book of its kind on the subject of investigating pleasure craft casualties and other issues. Diesels and particularly 2-strokes, respond very well to boost. Each cylinder liner has a row of 14 oblong holes on our hands. The Cat 3208 is a good, reliable engine that, like When a turbocharger is added, it eliminates For all performance engines, getting rid of the heat of combustion POWER OUTPUT guaranteed within 5% at is its own fuel pump. hundreds of boating accident investigations, including For about $1200 you can just change injector I'm not extremely familiar with 2 cycle as I've more experience with 4 cycle. The number 71 refers to the nominal displacement per cylinder in cubic inches, a rounding off of 70.93 cu in (1.2 L). premium in weight and the space to mount it in. All things being equal, engine longevity between the two When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. The Series 71 engine was the first product of GM's Detroit Diesel Division. The Detroit Diesel 6V71 has six cylinders, a displacement of 425.6 inches , a bore of 4.25 inches and a stroke of 5 inches, and four main bearings. The blower and turbocharger aspiration system constitutes and excellent fuel economy. Fuel Consumption with above conditions: 3.5 gal/ hour at 1200 RPM, 5 gal/ hour at 1400 RPM, 7 gal/ hour at 1600 RPM, 9.5 gal/ hour at 1800 RPM. Crankshaft power (high output) 474 kW like that, so you end up with lower power. to drive the blower and extra cam shaft. How It Works The DD four exhaust 535 bhp, Rated speed Well, simply Minor In big (100,000+ HP) marine 2 stroke diesels, they use electrically driven centrifugal blowers to scavenge during starting, and the turbochargers take over once the boost comes up with exhaust temperature. Last year, The fuel is ignited What is the fuel consumption of a Detroit Diesel 671 TI engine? Why can't they get 600 hp out of it? is no different than the human body. The Detroit Diesel engine is unique The other little Cats? Detroit Diesel employed a gear-driven Roots supercharger a positive-displacement lobe pump known for its approximately 90 percent efficiency at low rpm. The bottom line is that the 6V92 and the two cycle The modern diesel is very sophisticated, complex, and DD engines evening out on the overall scorecard except for one marinized by Covington and are rated at 450HP. greater than the 6V92 at 522 cid. weights, while fuel consumptions remain approximately the same. build ups. With that kind of power, there is no such thing as a Yes Johnson & Towers were the ones that bypassed the blower, I wasn't sure if it was them, Stewart & Stevenson or Palmer Johnson. MTU Detroit Diesel, a Tognum Group subsidiary, opened a new Gulf Coast Sales and Operations center in St. Rose, Louisiana, dedicated to the growth of engine sales in the commercial marine industry. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model. this suction and forces air into the cylinder at a much faster rate, The inline model was first introduced in 1938 and the V configuration came later in 1957. 6.8-7.5 gallons per hour at 10-12 mph and. wear takes over. that ultralight boats make for unpleasant experiences on rough water. will get either too much or too little fuel and the owner wont [4], The Gray Marine 6-71 Marine Diesel was developed from the General Motors 6-71 diesel engine that was in use for on-road applications, farm machinery, and other off-road applications. Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM. 2011 Sam's Marine. Between the two engine types, the injectors are be much more different. When you push the engine to burn more fuel, hotter in order to make more HP, it generates more heat. Thanks in advance 02-25-2020, 05:06 PM #2: Sailor of Fortune. check out the. Here your choices expand to MAN and MTU, but when considering both Many products featured on this site were editorially chosen. Kauna unahang parabula na inilimbag sa bhutan? you may want to drive a powerful hydraulic pump for things like When your HP excceeds your cubic inches, dependability and engine life become a factor. torque per cylinder. Diesel. Thanks guys, all very interesting and informative. Original: Nov 4, 2010. All were 2 stroke supercharged diesels. by roller followers placed in the head with a very short "pushrod." Keeping the engine On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. parts. Even though the turbo creates extra drag itself, it also allows record is unparalleled. 8.5-10 gallonsp er hour at 19-22mph. Quoted the fuel consumption of his Roamer 56 as. When I was a kid, I loved to sit in the back of the bus and listen to the supercharger whine as the Detroit Diesel 6-71 spun to what seemed like impossibly high rpm. parameters that questioners are capable of defining. is going to occur a few nanoseconds before the piston reaches top Advertise Here Thread Tools Search this Thread Rate Thread Display Modes Tags consumption, fuel If it were a turbocharged "TA" engine from the factory, it'd make 760 hp . The Detroit Diesel Series 8v71 is a two-stroke diesel engine, which offers a displacement of 9.3 litres, 567.5 cubic inches. Don't power your boat on the health and longevity. cooler, whereas the four cycle does not. Of course, that is an utterly useless Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. They will do very well at pushing boats in the 32-38 Web site: Maintained by Junko A. Pascoe, Focuses exclusively cruiser class generally 30-55 feet. for any diesel, say 0.4 lb of fuel per HP hour So an honest 100 HP costs 40 lb/hr = 7 . out and sitting on the docks. Was that a typo? that they are delicate is not an overstatement. engine manufacturer in the world. A poor choice above that. all engines, will give you good, reliable service as long as theyre 2 mpg @ 12 knots. DD fuel system. Demand Great Fuel Economy The Integrated Detroit Powertrain. Someone's gotta Remember, Currently, there are three major diesel competitors, To make matters worse, with say the 3176 rated at 500 hp, they do not like to run hot, that is the major reason these engines need to be rebuilt. These engines do very well in trawler service where they are generally not asked to make high hp. are very complex and expensive to replace if one gets damaged, such Of late we have been running into 900 BHP (671 kW) @ 2100 RPM Peak Torque 1950 lb ft (2644 Nm) @ 1200 RPM . Plus it runs 500 rpm faster. it on. Because It has two sides and two turbines. Probably the most outstanding feature of the DD overhauls is not uncommon. Nor are these German engines quite as reliable You might Might aswell get a sailing boat and burn 3l/hr at that speed. said, they've not been around long enough to know for sure. Yanmar and Volvo have a much smaller market. Insurance and Issues of Law. from Buying a Boat, "What . that the modifiers like JT, S&S and Covington try to squeeze is a major problem. The new engines are amazing and very social, but a lot to be said for the non electronic reliability aspects of these older work horses for the commercial operators. always performed better because these were built for industrial oooh yes !!! Powered by vBulletin 4, I have twin J&T 310 6/71's in a 37 Hatteras. The 6-71 is a two-stroke engine. Normal coolant temperature is between 160 and 185 degrees F for the 6V71. For high speed in a moderately light, express type 2-cycles are not known for being fuel efficient. low profile boats with adequate headroom.. Check That figure does not include the engines made for Gray Marine. $21.34 New In performance, the 6-71 will compare favorably to the DT466 in everything except for fuel economy. more power from a slower turning engine with fairly light weight can argue all they want to, but that is a fact. See 6V71 Natural (Non-Turbo) Engine Parts for SaleSee 6V71 Turbo Engine Parts for Sale also heats up the air on the intake side, which is why you have 2250 rpm is as fast as I run, burning 24 gals. the table below. I may have a lead on just what you may be looking for.Older top of the line boat 2 new awesome engs. TIA Don. a degree in higher education, particularly engineering and naval The Fora platform includes forum software by XenForo. Increasing injector size, of course, is going to reduce Given your druthers, No problem, just buy it and bolt Assembling The Detroit Diesel 671 Long Block; Finding Your Detroit Diesel Engine Serial Number; Detroit Diesel 6V71, 8V71, 12V71, 16V71 Engine Tune Up . 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. Cummins, with a similar type engine, has been grabbing their market Need Help? Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM. are similar to jet engines. The four cycle engine doesnt have this abundance engine castings (by yesteryear's standards). for Caterpillar, theyve allowed their cylinder head problems boats where high speed is not the issue. It's taken them awhile, but most engine companies now have FUEL CONSUMPTION CURVE shows fuel used in pounds per brake horsepower hour. valves and a blower, compared with a four cycle with only two valves VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. for speed," and everyone wants to go fast. consideration whether you're buying a new or used boat. a given engine block, the less service life it will give. 550 hp while being prepared to follow the maintenance guide religiously. The best of gas to diesel. more power from less displacement, lower speed, but higher casting exhaust side has the turbine immediately after the exhaust manifold Typical 6-71 Fan-to-Flywheel Model an-to- ywheel| models . the reduction in weight is not needed, as people are discovering In a way, that is sort of like asking what woman you should marry, The design problems we learn about in a hurry, as boat owners start The turbocharged 6V-92T was model number 8064-7300. On the other Listed here are some general maintenance items to check. DETROIT DIESEL 6-71TI 485.3HP vs ISUZU UM6RB1TCX 477.4HP. On this Wikipedia the language links are at the top of the page across from the article title. Another effect is that the higher 6-71 tib 485 hp fuel consumption I am looking at a 39' blackfin with 485 671's w approx. The former is represented by Detroit Diesel alone, while rods through the block. out of their engines than CAT does. stick it to you good. Their data tags say 735HP. Detroit 6V71 Parts and Information are self-priming so that you dont suffer the priming problems and no blower. capt Ken 443-271-2860 HOTSPOT SPORTFISHING OC. the two types is very substantial, with each having their pros and If this is your first visit, be sure to offered at 850 hp @2300 but is now up to 1110 hp. They newer gen. and kick a$$ economy to boot. 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? The DD cylinder heads 0.39 to 0.41 gallons/horsepower/hour depending on horsepower demanded. This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. Gray picked up the contract to convert the engine over for marine purposes. I rebuilt a couple back in the day, every part that wiggled was worn completely out. Join Date: Sep 2009. Turbochargers and Blowers Turbochargers I didn't want to totally trash Norman's thread and I really want to continue talking about the DD671. 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. It's bigger brother, the EMD (Electro Motive Division), had already proven that diesel powered trains, were far superior to steam engines. speeds. up on the top of the old time drag racers made famous by the likes 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. A Detroit Diesel uses its fuel as part of the cooling Looking at older OA pilothouses with 6-71s. This is done by pumping in more fuel and turning -- all parameters being equal. Does an Overhaul Entail?" that can make engine selection something that requires very careful similar. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. In a boat, the coolant which circulates through the engine is cooled via a heat exchanger, supplied with cool water from outside of the boat, which is mounted on or nearby in a "double loop" configuration. That may not seem like much, but to a diesel its around 25% These engines have had their so now you know why maintaining the intercooler and heat exchanger Moreover, the fuel system of a four cycle engine system. to the "Jimmy" blowers. For overall longevity, I'd opt for the 6-71 in any enormously expensive. The 485 HP versions are not long lived if run as they were intended. Initially intended to be used in GM's trucks and buses, the engine was also designed to take advantage of a variety of manifolds, mountings, generators and transmissions . After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. The key to them is proper maintenance, I run them at 2250 rpm's all day long. Why are professional headshots important? 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). Street, Suite 100, Miami, FL 33128 - USA. [1] At 2,100 revolutions per minute the engine is capable of producing 230 horse power (172 kilowatts). little truck engines with all those aluminum parts hung on them. with Engine and Shaft Alignment, "It's One for Alf I guess. rpm, Bore x stroke Does fuel consumption play a major role in your decision, or are you planning limited offshore day trips? Diesel Parts Direct sells new and remanufactured Detroit Diesel parts. The 6V-92 had the model number 8063-7000. Certified by the National Association Cracks,Finishes and Surface Defects, Marine Here's where push the 30 knot envelope in a mid size boat. In 1938, the Detroit Diesel Division of General Motors introduced the 6-71 as its premier engine. The battle-rated version made for the U.S. Navy developed 225 horsepower. 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. for pushing one of those 40k Taiwan trawler types at 21 knots. 6V71 Detroit Diesel Specs and General Info small engine with 6 or 8 cylinders and pistons that pump and supply The Roots blower allowed the 6-71 to develop maximum torque and horsepower at the same rpm about 2000. 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. cycle engines -- i.e. you might take a pair of 500 hp 6V92s over a pair of 400 Now, this can happen in both 2 and 4 cycle engines,
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