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Tool Talk Discussion Forum

Speakin of 6-71's

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Can't even use

03-31-2006 06:29:01




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I got an '83 tandem axle GMC with what I beleive is a 6-71 Detroit. Inline 6 with a blower so it really is pretty obvious. It also has a turbo. So what is the RPM range on this thing? Seems like most of the power is at 1600-1800 and anything over that you really lose gitty up! I have taken it up to 2100 before but it feels to me like 1800 is about the most useable limit. And just what kinda power could this puppy be cranking out? And are there any easy ways of getting MORE power, argh argh argh!

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buickanddeere

04-01-2006 21:16:50




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 Re: Speakin of 6-71's in reply to Can't even use my name, 03-31-2006 06:29:01  
If you consider the 6-71N was only a 210HP engine at best, then yes they did pretty good for what they where. If you wanted power then a 8-71T or larger was required.



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scottf

04-07-2006 12:00:03




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 Re: Speakin of 6-71's in reply to buickanddeere, 04-01-2006 21:16:50  
A 6-71 N Series could be perchase in a 238 HP version.



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mf294-4

04-01-2006 05:16:14




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 Re: Speakin of 6-71's in reply to Can't even use my name, 03-31-2006 06:29:01  
We got one in a 10 wheeler with a 10 speed trans. Haul 600 bu over the hills, well over some of the hills, have to be selective about our route. Need a long run. Only one way to run it, foot to the floor either on the throttle or the brake. Ran some on rollers and JD 860 scrapers also Le-turno with electric steer, remember those? Industructable engines, well I never saw one fly apart. Heard stories about them running away.

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Mike M

03-31-2006 07:48:00




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 Re: Speakin of 6-71's in reply to Can't even use my name, 03-31-2006 06:29:01  
I haven't ran one of those but,when I ran a Mack the other guys had those and they made more noise than power.



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the tractor vet

03-31-2006 08:15:08




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 Re: Speakin of 6-71's in reply to Mike M, 03-31-2006 07:48:00  
Ah you have never lived till ya spend a day on a model C Le Tureno ( spelling)with a hoped up 6-71 detroit that had been up graded from a 2 valve 198 to a 4 valve 238 twisten 2450 with three exhaust manifold off of a 2-71 and THREE stright pipes and i wonder why i have a hearing problem today , spent many days moven dirt with that thing you could hear it two countys away .



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MarkB_MI

04-01-2006 06:06:23




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 Re: Speakin of 6-71's in reply to the tractor vet, 03-31-2006 08:15:08  
Vet,

My dad had a LeTourneau C-Pull with an 8V-71 Detroit. With the engine right next to the driver, that thing was deafening.

Wierd piece of equipment. Electric steering by means of a toggle switch. Another big electric motor drove the paddles. Thing was broke down more often than it ran.



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fixerupper

03-31-2006 11:02:38




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 Re: Speakin of 6-71's in reply to the tractor vet, 03-31-2006 08:15:08  
We had one in a cabover international that we turned into a service truck. First of all, it had the air starter so when we started it we would wait for someone to come walking around the front of the truck, then we would hit the starter and watch him jump up in the air about three feet. Anyway, the old girl was neglected pretty bad because everyone drove it and no one wanted to check the oil or water, so one day while cruising down the interstate, pulling a trailer with two combine headers on it, she seized up from lack of water and the truck coasted to the side of the road. We pulled it to the nearest town with the thoughts of calling a salvage yard the next day. Next morning we were cleaning it out and one of the guys decided to put oil and water in it and try to start it. Well, it started right off and we drove it 1200 miles to get it home, still pulling the trailer, and it seemed to have more powere than ever. We had to add water every 200 miles and when we got home the oil was like a thick gray milkshake but at least it made it home. Since that event I have always thought of the old Jimmy as being about the toughest engine made. Jim

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THE TRACTOR VET

03-31-2006 06:55:30




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 Re: Speakin of 6-71's in reply to Can't even use my name, 03-31-2006 06:29:01  
Well it is all to do with the timming and govener set up as to where they make there full torque . Now if it also has a turbo charger on it it is one of the last ones and it is suppose to be around 250 HP. , Now one thing with them old Detroits is that if it seams to make more power with the pedal not on the floor and up just a littel bit then the rack is out of adjustment and it is in need of a tune up as there is only one way to run one of them and that is FIRST THING IN THE MORNING WHEN YOU GET IN THE TRUCK IS TO PLACE ONE HAND IN THE DOOR TAKE THE OTHER HAND AND PULL THE DOOR CLOSED ON THE FIRST HAND AS HARD AS YOU CAN THAT WAY YOU ARE GOOD AND MAD TO START THE DAY OFF AND YOU RUN IT LIKE YOU ARE MAD AT THE WORLD.

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Richard H.

03-31-2006 08:21:16




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 Re: Speakin of 6-71's in reply to THE TRACTOR VET, 03-31-2006 06:55:30  
Good answer, My brother had a GMC with a 238- 13 speed spicer. I would drive for him once in a while and people would look at me like I was flat nuts! But thats the way they were designed.. Last thing you want to do is lug one, pull a sleeve in a heart beat. Truly the sound of getting nowhere fast! Richard



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