Re: [lro] 2.25 compression ratio

From: Keith Tanner (keith@miata.net)
Date: Sun Jan 12 2003 - 22:24:49 EST

  • Next message: Paul Oxley: "Re: [lro] 2.25 compression ratio"

    The question is not how much can be taken off X head, but what is the
    maximum safe workable compression ratio of the 2.25 - correct? 9:1 is the
    highest I've heard.

    Keith

    At 00:05 13-01-03, you wrote:

    >I believe it depends on the head, as some didn't have as much spare
    >metal. Unfortunately I don't remember which ones those are, but I bet
    >a search of the archives will give you the answer. The most that can be
    >shaved off is 100 thou. That will bring a 7:1 head up to 8:1, and an
    >8:1 to 9:1. You could also have the block decked, shave some metal off
    >of the top face of the block. I don't know how much of it can come off,
    >but a machine shop could measure for you. You will also need shorter
    >pushrods, or will need to shim the rocker towers.
    >
    >Monika & Steve Rochna wrote:
    > >
    > > All:
    > >
    > > Does anyone know what the highest safe ratio to have a head shaved to for
    > > general purposes? Here at four thousand feet any bit of power addition
    > > would be appreciated but I don't want to jeopardize my engine - I know it's
    > > not a race car.
    > >
    > > Thanks - Steve Rochna, Fallon, NV
    > > 1972 SIII 88"
    > > 1968 SIIB 110" FC
    > >
    > > ---
    > > [This E-mail scanned for viruses by Oasis Online]
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    >
    >--
    >Jim Hall
    >1966 88" Elephant Chaser
    >http://webs.purplemountain.net/jimfoo/Foospage.htm
    >"You know, I never really damaged my Rover 'till I started wheeling
    >with Jim." Mitch Stockdale
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    >http://land-rover.team.net/mailman/listinfo/lro

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