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Computers and compression

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Nov 6, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    How much effect does compression have on a computer?
    If I decide to rebuild the 350 insted of a 383, I was wondering if I could take my compression up to around 9.0-1 or a tad higher and not have to worry about the computer not liking that.

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  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I'm pretty sure stock compression ratio for a TBI 350 is about 9.2 to 1...

    Rene

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  3. ftn96

    ftn96 1/2 ton status

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    I was thinking it was lower than that. But thats all I was doing was thinking. [​IMG]
    Where can I find out what CR I'll get with a given piston/head cc size?

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  4. Burt4x4

    Burt4x4 3/4 ton status

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    Now what the heck are you thinking???
    You keep letting your mind wander you ain't never gonna get your new motor!! hehehe J/K
    Just stick with the 383 but keep the parts simple and matched.
    I just have a bare block for my build up and all the parts I buy for it will have two things in mind
    Low End Torque
    &amp;
    Continuous Duty (strength for long running times)

    Not for race and high RPM, don't need the best flowing and roller this and roller that to make a workhorse tourque monster that will never see over 5000rpm.
    my .02c

    Oh and sorry for not answering your ??? I don't know!

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  5. HarryH3

    HarryH3 1 ton status Author

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    The computer doesn't care about the compression ratio. [​IMG]

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  6. ftn96

    ftn96 1/2 ton status

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    Ok, so now when I start ordering heads and pistons, do I ask the tec/salesman what pistons with these heads with give me a x-1 compression ratio?

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  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Look on the web, there are several sites that explain it. But compression ratio is computed using bore, stroke, piston dish or dome cc, head gasket thickness (compressed) and head chamber cc. I may have forgotten something but if you do a search there will be several sights. Go to click here
     
  8. ftn96

    ftn96 1/2 ton status

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    Cool, I found a killer calculator. The only ? I have now is what is a the standard thickness of a head gasket?

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  9. HarryH3

    HarryH3 1 ton status Author

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    Depends on the gasket. [​IMG] Check out the head gaskets on a site like <a target="_blank" href=http://www.summitracing.com>www.summitracing.com</a> and see if the compressed thickness isn't included in the specs. You can also buy gaskets that are a little thinner or thicker to adjust the compression ratio. [​IMG]



    <font color=black>HarryH3 - '75 K5</font color=black>
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