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Cam- HP vs. gas mileage

This is a discussion on Cam- HP vs. gas mileage within the Internal Engine forums, part of the LSx Technical Help Section category; what I was wondering was at what point does the gas mileage drop off dramatically when going with a bigger ...

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    Awaiting Activation Liquifire's Avatar
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    Cam- HP vs. gas mileage

    what I was wondering was at what point does the gas mileage drop off dramatically when going with a bigger cam? Does it happen in the 220's, 230's or bigger?

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    Junior Member MNR-0's Avatar
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    2004 Monaro

    Anything bigger than stock will result in less gas mileage. It is more obvious when at idle, due to the increased overlap. If you spend a lot of time in city traffic, a cam of 220 or more duration will double your fuel consumption at idle and just off-idle.

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    Awaiting Activation Liquifire's Avatar
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    I do not spend a lot of time at idle.........I was concerned more with cruising speeds.........is a bigger factor the lobe separation or the lift? Probably a bit of both would be my guess........anyone?

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    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    my stall converter is worse for mpg than my 224 cam.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
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    226/234 554/575 112 Lunati grind.

    I got 27.5 MPG on the highway and 22.5 MPG around town with mostly light driving.
    It was on the stock tune.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
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    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

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    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    just depends. i know of a person that went from the stock cam in his 04 gto to a vinci 079 cam and 1.8 rockers. picked up 50 rwhp and 4.5 mpg.

    cam specs
    DUR @ .004" 272*/280*
    DUR @ .050" 210*/218*
    LIFT .551/.551
    OVERLAP 48*
    LSA 116*

    he goes by jonlee on ls1gto

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