I can have a crane running engine V6 6-71T.... about 400hp and 850 pounds of torque ... complete ... supercharged and turbo ... Does anyone already know about this engine ... this can be a great engine !!
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I can have a crane running engine V6 6-71T.... about 400hp and 850 pounds of torque ... complete ... supercharged and turbo ... Does anyone already know about this engine ... this can be a great engine !!
The only thing I found online about it is that its called a 6V71T. Its a 2 cycle diesel so it needs the blower for air.
Looks like its popular in marine applications.
Would love to see an alternative to the Cummins 4BT or the GM6.2
Keep us informed of the progress.
i wanted to put one of those in my 715, but they weight ALOT! and i never found one, so i settled with a 6.2.. but yea i would like to have a 6v71. love the way they sound
Don't mistake the turbo vs supercharger issue. There were very few that had both of them (this was something they did on old airplanes, but not often on this kind of motor).
They used to call the turbo a Supercharger/turbocharger.
Size and weight. These are not small V6 motors!
6 cylinders, each having 71 cubic inches. 426 cubes overall.
I have a 6-71 with the blower setup in my old bulldozer. Ran great, good mid to high rpm power, but NO low end grunt.
These motors are really good for constant rpm applications like boats, stationary power, etc.
Two stroke diesels are, um, LOUD!!!
1200 to 1400 lbs. I think that is enough said on the weight.
i'm sure it's a supercharged with a turbo ... my friend work for a crane cie and he have 3 in stock ... all are running .. 2 with only supercharged and another with bot sc and turbo. But weight is not a friend in this case.
I have driven them and worked on them in skidders. Very loud and big. Don't know how well they would fit in the engine bay. I have seen some trucks with the four cylinder detroits that work pretty good. Have good hearing protection if you do use one. They call them a screaming jimmy for good reason.
I would check to see if it will fit and if it does I would do it in a heartbeat!! I think it is a great project. I would do it it if I had access to the motor.
Of course the rest of the drivetrain will need to be upgraded.
Kevin
Just spoke with my friend ... it's trully Detroit 6V71T ... got 3 in stock .... they are giving me those motors for free ... just have to get them by friday of this week ... but they weighted almost 1500 pounds .... They are all 3 running but since they rebuilt the entire crane , his boss not taking chances and have the motor replace just in case .
And the only part his boss keeping is the flywheel ... so 3 engines without flywheels. I think it will just cost too much having this kind of motor.
I'll keep my Dodge ram powertain ..... simpler and more cost effective.
Not to mention the cost of parts will be resonable and you can get the parts virtually anywhere. I'd hate to see the price tag for just a Detroit flywheel...:eek:Quote:
Originally Posted by Kamikaze12volts
I put a lot of miles on a 6V71T pulling a milk tank for a friend of mine, . . They are getting harder and harder to find because of smog restrictions. They are a 2-stroke, and most of the ones in OTR rigs actually have both the blower and the turbo. The 71 series was available without the turbo, the next engine in the series is the 92 and it's upgrade "silver 92". The silvers all had both supercharger and turbocharger, and could really pull. The HEMTT uses a 8V92 silver. Because of the design, that HAVE to have the blower, but the turbo was optional on the 71, although really almost needed to get decent power. This engine is VERY heavy, great for endurance, but too much for a 5/4. I have seen a 6V53 stuffed in a pickup, . . there wasn't any room left!!. . . I don't think it would be a good choice for a M715
Yeah, nothing wrong with a Detroit (I hope to have a 4-53T one of these days...), but in all reality a '71 series Detroit is way too big for the 5/4 ton suspension. Plus parts plus transmission options, etc, you are really stepping into heavy duty commercial truck kinda stuff. Huge roadranger transmissions and the like.
Interesting fact, ALL the old Detroits are at least supercharged, they have to be in order to run properly since they are 2 stroke engines. Don't be fooled, the supercharger really doesn't boost the power output, its simply there to provide a constant positive pressure on the intake, otherwise the engine wouldn't run. Now the turbo versions are the Detroits you want to get because at idle the supercharger holds a little positive pressure, but then at higher RPMS the turbocharger puts out far more PSI boost than the supercharger and actually adds to overall performance. Basically at high RPMS the supercharger doesn't do anything and the turbo is doing the work for boost.
Our tender at the fire station is an old Freightliner with an 8V92T Detroit in it...talk about a big engine, 736 cubic inches. That sucker screams when it is wound up. Those engines also leak, no I should say that they slobber, lol. If a Detroit stops leaking, that means it is out of oil, lol.
They are getting harder to find and get parts for due to the fact that they are a dirty engine emissions wise and aren't being built anymore that I know of. I am in CA and haven't seen one in a big rig for quite a while.
Just the noise alone would drive me out of the cab.
Sometimes a little engine noise is cool, but a 6v71 would be more than obnoxious ;)
My friend is a truck mechanic who has been wrenching on these things for years refers to the old 2-stroke detroit as "road oilers" because no matter how careful you are in assembling them, even a fresh one will leak. If you ever see one apart, it is an interesting design . ..and you can see why the supercharger is needed. . .Quote:
Originally Posted by rpgdeity
I like how they show the 6-71 as RA - Naturally aspirated!
And you clearly see the blower on the side of the block.
I do understand that it is required to run the motor, but it still isn't a N/A motor.
Too bad those photos don't put anything in them for size comparison. I know the 6-71 in my dozer is pretty darn BIG!
Oh yeah, I seemed to find a lot of parts availability for my 6-71.
And that motor was made in 1947!
yea i had a 4-71 i think it was, and it was huge, never heared it run. but i did put it in the jeep, and it made it sit on the bump stops, so no doubt it was heavy lol. not to mention the motor was loong and would probably not fit at all... but still after that motor ive been looking for a 3-53 to use, and sure enough my buddie who's dad owns a farm that has about 20 or so of those motors for pumps, and ive definetly been thinking about it, but it would be super under powered.