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4.0-L, Mileage improvements

Discussion in 'Stock 1991 - 1994 Explorers' started by Dirtypaws, March 3, 2009.

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    1. Dirtypaws

      Dirtypaws New Member

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      Hello all. Still new at this.

      I see where the mileage numbers for the 2009 version of this German engine are much better than those for my 1994 version based on the same block.

      Can any of the improvements be retrofitted?

      Thanks.

      Dirtypaws
       
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    3. Sams01XplrSprt

      Sams01XplrSprt Southern Cali Explorer

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    4. aldive

      aldive Elite In Memoriam

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      You are comparing apples to oranges - the SOHC vs the OHV.

      There are lots of things you can do to improve gas mileage, take a look at http://www.explorerforum.com/forums/showthread.php?t=44372&highlight=quest
       
    5. Dirtypaws

      Dirtypaws New Member

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      Yeah. That sounds like more than a tweak. Thanks Al.
       
    6. Maniak

      Maniak Moderator-Stock 91-94 Staff Member Moderator Elite Explorer

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      IIRC they aren't the same block, not even close to the same design..

      For the 4.0 ohv, better intake, cooler intake air temp seem to help BUT there isn't much you can do to tweak more mpg from the motor..

      Its more a combination of tires size/gear ratio and most importantly speed.

      We see a 2mpg difference between 70 and 65. We get 17ish at 65.. and thats with a 33" spare tire on the roof with 33" tires. Our X is no longer aerodynamic (if it ever was :)).

      Thats highway mpg.. Around town I don't bother measuring, plus we don't drive in town that often..

      If you can figure a way to do it on a 1st gen, replacing the engine fan with an electric fan can help quite a bit, especially on the freeway.. But I don't think I've seen anyone sucessfully get an E-fan to work the way they wanted on a 1st gen (at least not in hot climates).. 2nd gen is a different story.

      ~Mark
       

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