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8.1l v8

Discussion in 'Trucks and Trailers' started by Jpeg lawn maintenance, Jan 15, 2010.

  1. Jpeg lawn maintenance

    Jpeg lawn maintenance LawnSite Bronze Member
    Messages: 1,638

    hey all looking at the chevy 2500 was wondering how hard on gas the 8.1 is and how much more powerfuul is it than the 6.0 ? thanks for the help.
  2. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Here is some quick math:
    1 liter = ~60 cid.

    So, you want to know how 'good' a 486 cid V-8 is on fuel?

    Because I couldn't say for sure but I can tell you that when you step on the gas pedal of
    something that has a 455 under the hood you can literally hear it sucking fuel.
    No I'm not kidding.

    Most folks who buy vehicles with them size engines are not concerned about fuel economy.

    You want economy then stick to 5.0's (~300 cid's), once you get up to a 350 (6L) you're hurting,
    my 30 gallon gas tank on my 5.9L doesn't last me a week, I'm lucky if I get 300 miles out of it.

    A 5.0?
    I used to get 14-15mpg trailered and 12-14 loaded, the 5.0 pulls just fine but everyone keeps wanting more power...
    Frustrates me to tears but then I guess other people's sons and daughters keep the oil flowing with their blood.
    Last edited: Jan 15, 2010
  3. JBlawn

    JBlawn LawnSite Member
    from ohio
    Messages: 197

    my chevy 2500 6.0 gets me around 10mpg city with a trailer im thinking 7.5-8 have not pulled one with it yet so not sure, i just got it..
  4. Jpeg lawn maintenance

    Jpeg lawn maintenance LawnSite Bronze Member
    Messages: 1,638

    thanks for the repies more input would be apprecaited.
  5. doubleedge

    doubleedge LawnSite Senior Member
    from ND
    Messages: 911

    You seem to really like 5l engines. Perhaps you will be happy to hear that ford is going to put a 5l on the next f150 (and mustang). It is called the coyote 5l, and it makes ~400 hp and ~400 ft lbs torque on the mustang (will probably be tuned down for the f150).
  6. GravelyNut

    GravelyNut LawnSite Bronze Member
    Messages: 1,594

    Owning a 2001 8.1 340 HP/455 lb-ft, don't believe all the bad you hear about fuel use. From empty to 17K it still gets 12 MPG, on the highway, at legal + speeds. But that is with 4.10 gears instead of the normal 3.73s. That change alone adds 2K lbs to the towing ability. As for comparing it to the 6.0, forget it. Apples to oranges as far as torque and the 6.0 doesn't have the Allison. Plus the 8.1 is a 250K BIF rated engine. Some produce up to 95 lb-ft more torque than some of the 6.0 engines, or about 1/4 more torque. In the hills, you'd notice it. The 8.1 will run 3200 RPM up a 5% grade at 65 MPH in 4th with a GCVW of 17K. The 6.0 would be more like 4500 RPM to get the power and at its max load maybe down in 3rd gear. And getting no better mileage.

    PS Topsite, the GM Vortec 8100 is 496 cubic inches.;)
  7. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    Start the engine up there goes a 5 gallon can of fuel start putting your foot into it and now its really guzzling fuel :laugh:
  8. GravelyNut

    GravelyNut LawnSite Bronze Member
    Messages: 1,594

    I worry more about the tires than the gasoline. The outer rears don't last too long.
  9. South Florida Lawns

    South Florida Lawns LawnSite Platinum Member
    from usa
    Messages: 4,784

    Well no one owns them, they aren't available anymore and you can get trucks with that engine in em dirt cheap, so what does that tell you?
  10. doubleedge

    doubleedge LawnSite Senior Member
    from ND
    Messages: 911

    They are still available with medium trucks. They are cheap because not many people need that much power and don't go with a diesel.

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