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Ford 83-94 6.9 and 7.3L General Discussion of 83-94 6.9 and 7.3 Liter Ford Diesels

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  #1  
Old 12-16-2009, 09:48 PM
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Status: open manifolds sound terrible!

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I WANNA BUY A 1985 F350 6.9L 4 SPEED, 3.55 GEARS, OR 3.73. WHAT KINDA HIGHWAY MPG DO YOU GUYS THINK I'LL GET? I DO PLAN ON GETTING A BETTER AIR INTAKE, AND A HIGH PERFORMANCE EXHAUST.
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  #2  
Old 12-16-2009, 10:02 PM
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Its not going to break any records... I would guess in the mid teens at best.

Not much to do about exhaust, is it a turbo or NA?

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  #3  
Old 12-17-2009, 03:09 PM
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Status: open manifolds sound terrible!

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NA.
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  #4  
Old 12-17-2009, 03:33 PM
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Performance air filter isn't going to help much, and they let too much dirt and dust into the engine anyway. You might get 20, but that's if you drive it easy.

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  #5  
Old 12-18-2009, 08:02 PM
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Status: Motorheads never die, we just get rebuilt.

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with mine, 4 speed man, 3.55 gears and 35 inch tires. i got 25mpg on the highway.
75 mph from lima ohio to quakertown pa, 600+ miles on 2 tanks of fuel. 16 gallon tank.
15 around town. truck loved to cruise.

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"The Tractor" 1986 ford F250 6.9 diesel,pump turned up 2 flats, ATS TURBO puttin out 10 psi max, np435, bw1345, hp60 front, welded up sterling rear sittin on 40x13.5 baja claws.
converted to 4X4 and Shortbed!
i'de rather be 6.9'n than cummin' or strokin' Built by Hicktown Motorsports
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  #6  
Old 12-30-2009, 12:10 PM
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16-17 max hwy
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  #7  
Old 01-12-2010, 10:16 AM
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Status: 97 12 valve. likes to smoke

   

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hey diesel crawler how come the old diesels got rly good milage hauling ass down the highway? i used to have a gm 6.2 and it got like 22-23 when i held it on the floor bored going down the interstate... like the camo paint job
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  #8  
Old 01-12-2010, 08:16 PM
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was never quite sure, unless the air flow into the intake at higher speeds aced like a little turbo? but never figured out why it got so good.

mine wasnt to the floorboards. the truck would do 105 before it hit the engine gov. so at 75-80 i was probly around 2500-2700 rpms.
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  #9  
Old 01-13-2010, 01:35 PM
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Status: 97 12 valve. likes to smoke

   

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mabey the injector pump leans out or somthing, my 12 valve the faster i drive it the more fuel it sucks
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  #10  
Old 02-13-2010, 05:39 AM
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You GAS MILEAGE will be excellent! Your truck is a diesel!
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