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Thread: Why does an L28 make less HP than a L24?

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    Lightbulb Why does an L28 make less HP than a L24?

    Hello all. I am new to this forum and I have decided to start off my first entry (question) with what i feel is a very rookie question--

    Why does an L28 make less HP than a L24?

    To my understanding, the fuel-injected L28 makes less HP because of "an increase in smog emissions requirements(back in '74)." So, I assummed that removing all of the egr and smog stuff would make for an immediate HP gain. But, I read that this in fact does not icrease HP and could even lead to a decrease in HP. Any info relating to this would be greatly appreciated since the answer to this question has evaded me for so long.

    BTW, I currently do not own a Z, but I am planning on purchasing one soon.
    Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!

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    No more body roll! SteveJ's Avatar
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    Define less.
    Read these links with regard to net and gross horsepower:
    http://en.wikipedia.org/wiki/Horsepower
    http://neptune.spacebears.com/opine/horsepwr.html
    I'm not sure when Nissan started using SAE net horsepower for rating their engines, but I know that the 2.4L is a gross horsepower rating.

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    Former frequent poster sblake01's Avatar
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    I think Nissan made the change from gross to net in 1979. The 78 L28E was rated at 170HP/5600RPM vs 150HP/6000RPM for the L24, both of which are net HP. The lower HP ratings for the L28E began in 1979.
    2004 Ford Ranger EDGE Supercab
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    Datsaholic Mr Camouflage's Avatar
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    Quote Originally Posted by SFART
    Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!
    If you are putting in a 280zx turbo motor, isn't this discussion rather pointless, as the zxt can make alot more power than either the L24 or L28.
    www.nostalgictrio.com Skyline - Silvia - Fairlady Z
    www.ozdat.com The Australian Datsun site.
    www.cafepress.com/vintagedatsun

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    the QuackWacker GunnerRob's Avatar
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    ...and why are there two threads created by the same member on the exact same topic?

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    Former frequent poster sblake01's Avatar
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    Three!!!!!
    2004 Ford Ranger EDGE Supercab
    (@Moonpup: This one really is an EDGE!)
    2005 Pontaic GTO
    2010 Mercedes Benz C300 AMG Sportline (Wife's car)
    2014 Kia Rio LX (Wife's daily driver)
    Certified HVAC/MVAC Technician

  7. #7
    Still plays with cars kenz240z's Avatar
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    Hi, SFART,

    Welcome to the club!
    Kenny P.

    '73 240Z
    '82 ZX L28
    '82 ZX 5-speed
    Round top SU's
    Tokico HP struts
    Tokico Springs
    Urethane bushings

    my gallery

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