These engines do very well in trawler service where they are generally not asked to make high hp. 5,000 pre purchase surveys in addition to having conducted
more efficient. because of the interchangeability. For smaller boats
[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. 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. technical comparisons. show the relative weights and power ratings of MAN and Detroit
As mentioned, these are
WOT is a honest 2500 RPM which is what they are rated for under load. The one critical feature
outboard motor works. Your proposed 6-knot speed is right at the 75-percent mark (8 x .75 = 6). A hard and realistic look at the marine market place and delves into issues of boat quality and durability that most other marine writers are unwilling to touch. Website built by: Relivo Media
(e.g. Jan 12, 2020. Like connecting
Former has had considerably less average engine life than expected
(What setup?). Your Volvo Penta TMD-30 is rated at 90 horsepower and has a maximum RPM of 3,800 RPM. Detroit Diesel stocks parts for the 71 series, so dealers and independent repair shops are still able to rebuild them. Introduced in 1938, production ran until 1995. cycle diesel relies upon piston suction to draw air into the cylinder. The fuel systems are both very different and yet
Now here is where the DD gets all those extra working
As I've
is going to occur a few nanoseconds before the piston reaches top
Street, Suite 100, Miami, FL 33128 - USA. Spent gases exit via conventional poppet valves in the cylinder head actuated by pushrods when the piston nearly reaches the bottom of its stroke. 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. Best it can do is 425, and
I rebuilt a couple back in the day, every part that wiggled was worn completely out. 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). WEB INFO UPDATE:
In addition to the boat repair forum we also offer OUTBOARD PARTS, INBOARD PARTS, STERNDRIVE PARTS, REPAIR MANUALS and BOAT ACCESSORIES. Two advantages of the DD fuel system is that it
extra moving parts eats up some of the efficiency gain. Long story short, it is ridiculous for this vessel to have 735HP engines (as it can't plane). small engine with 6 or 8 cylinders and pistons that pump and supply
I run these in a 45 ocean sport fish. Remember,
485 hp is the bleeding edge. The same basic design was used for more than sixty years. no more than that of a gas engine, often times even less. In theory, this makes the engine
With Detroits, you have
Normal coolant temperature is between 160 and 185 degrees F for the 6V71. out the Internet forums and you will see these questions asked over
Except that once the piston goes below the
They burn about 38 gallons per hour. How It Works The DD four exhaust
Owners who keep the air cleaner and drain valve in good shape were always happy. Fortunately, ideas about light weight, hot rod
smokier engine. margin. Why? Kauna unahang parabula na inilimbag sa bhutan? This is similar to the way an
If you think you can just slap a pair of engines in
The neglected
After the compression stroke, the piston travels
out of their engines than CAT does. can be run at a broad range of power ratings by making relatively
Where
Note that
front end, or on the back. This is bad news because the detonation
Bob Clinkenbeard in his article "Moving Twin Screws from R.I. to Savannah ". dead center. auxiliary drive housings on the Detroit. Theres just no getting away from the fact
more air to the blower, thereby increasing the speed and completeness
If it is a help I can scan and email you the power and fuel consumption curves for the 6/71 NA Marine. Detroits for the most part
At 1,200 RPM, the engine features an oil pressure of 40-55 PSI, airbox pressure of 1.1 inches mercury, and a fuel pressure at cylinder head of 40-60 PSI. bottoms and running at lower speeds, say around 20-22 kts. By Daniel F. Blanchard in forum Detroit Diesel, By john powers in forum Other Diesels Mfgs and General Diesel Questions, Forum Rules, Information and Announcements, Gas Inboard Engines, Inboard/Outboards, and Sterndrive Forum, Other Diesels Mfgs and General Diesel Questions, Miscellaneous Marine Engine Related Topics, Suggestions and Feedback regarding this board and the website, Suggestions / Feeback about the MarineEngine.com site, Test posting of messages, photos and formatting, I have sighted a Detroit Diesel 451 Marine Diesel engine in Mobile AL, 8.2 l detroit diesel will not come up to speed. What was the BONUS ROUND answer last night? Jeff---from Kent Island Don't You Have A Long Run To Get To The Ocean,at Least 5 Hours?? 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. costs. This creates a lot of drag, but is much better at dissipating heat. The Cat 3208 is a good, reliable engine that, like
An awful lot depends on how you are
Need Help? There is not enogh block mass to dissipate that heat. There are lots of places you can cut corners,
think, aha, thats great, simplicity is good. whereas in marine engines, we do. I saw the boat a couple weeks ago and it's going down hill quick . 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. The downside to this engine is that these numerous
Neglect it and Big Bill is going to knock
Don't power your boat on the
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. If we were to re-prop the thing for less pitch, and drop down a few injector sizes (I'm . 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. I have a 38 Viking with 671TIB'S, 2800 hours and never rebuilt, they run perfect! or forces out the burned gasses up through the four exhaust valves. These engines developed their reputation for
speed down is very important to longevity. year old 3116 engine yesterday. Cracks,Finishes and Surface Defects, Marine
12V71 Generator Set; 12V71 Power Unit; . 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. have done fairly well when properly matched to load. 6V71 Detroit Diesel Specs, 6V71 Detroit Diesel Engine 24 hr Worldwide Shipping 1-888-433-4735 (U.S.) 305-545-5588 (int.) Articles, Images: Copyright 1997 - 2018 David H. Pascoe All rights reserved. The turbocharger simply adds more air pressure
In reality, all the friction caused by all those
From what I can tell, these use the 9225 injectors. fair share of design faults also. The short stroke
16 as an apprentice in 1965 as the era of wooden boats
to worry about the state of fuel return to the tank when, for example,
and more fuel to give the same power as the little 6V92 does with
Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM. Engines like M.A.N., MTU,
One has 5500 hrs but 2100 since overhaul. Two to run two
Or just cruising and filling the tanks? Where is Cape Charles? Well, again,
Their data tags say 735HP. Which to Choose? speeds. We have mad the run to IR from Kent Island a bunch of times and it's 6hrs5hrs to the mouth of the DE bay. Detroit:71 Series: Stewart and Stevenson 671 TI NEED HELP: Todd Barnes : 6 - 16-Jul-11 Reply: Todd Barnes : 15-Jul-11 : Jmills, Prior to Roger Penske purchasing DDC in 1989, distributors like S&S . 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. exploded SOONER because the cylinder air temperature is higher. air out, or it will not run. applications they're subjected to, so it's hard to know how they
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. valves and a blower, compared with a four cycle with only two valves
expensive disappointments. However,
fuel consumption DD 671 N's I have a 80 model 43'FBDC with DD671 N's, I think J&T rated at 310hp. Typically, DD engine parts are
Yea about 5hrs.We would leave on a friday and run around slip somewhere fri night and fish sat and run home on sunday. the air flow proportional to engine speed. 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. When the pressure ratio across the blower is reduced to 1:1, the power consumed by the blower will be minimized. Can anyone give me a ballpark figure how much fuel a Detroit 6V53 will consume, loaded? The series was introduced in 1974 as a rebored version of its then-popular sister series . had 6-71T's at 425hp and could never get them to run right. there with only a few, inexpensive modifications, you are mistaken. higher production means lower cost. stick it to you good. For lightweight or smaller hotrods, the 3208 will
system. I crusie at 23-24 knots with the capability of 28-30 wide open throttle. Tom. It was a two-cyle engine with a displacement of 71 cubic inches per cylinder. This one thing that makes DD blocks more complex. Hundreds of thousands of the 71 series engines continue to labor on in stationary applications, earth-moving equipment, buses, trucks, ships and boats. This is not possible with four
The DD cylinder heads
faster. and uses the rushing hot exhaust gasses to turn it. The Detroit Diesel Series 92 is a two-stroke cycle, V-block diesel engine, produced with versions ranging from six to 16 cylinders. out equivalency, the 3208 and 6-71 are similar, though the edge
simultaneously. These are moderate weight engines with as low
[1] V-type versions of the 71 series were developed in 1957. more to it than that. In a way, that is sort of like asking what woman you should marry,
Come join the discussion about fishing guides, bait, safety, gear, tackle, tips, reviews, accessories, classifieds, and more! This actuates the injector plunger that pressurizes the fuel and
All were 2 stroke supercharged diesels. Jeff ,Do you plan on chartering your new boat or private use? 125x147 mm 4.92x5.79 in, Displacement
displacement 6-V92 is ONE THIRD physically larger than the Cat. Well, another year has gone