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Thread: blowers/ turbo's

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Jan 2008
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    146

    blowers/ turbo's

    hey whats your compression with and with out your boost??
    anyone done any readings like that?, before ,and after boost is applied?
    -8:1 b4- 12 after??
    curious is why i ask

  2. #2
    Senior Member MASTER BUILDER
    Join Date
    Mar 2003
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    127
    ((boost psi / 14.7) + 1) x motor compression = effective compression

    this is the compression ratio including boost of a turbo/blower motor compared to a naturally aspirated (sp) motor

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Dec 2004
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    austin texas
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    729
    well if this calculator is right, my street car has 8 to1 before and 13.6 after 10 lbs and my dragster has 12.5 before and 25.5 after 15lbs?

  4. #4
    Senior Member MASTER BUILDER
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    Mar 2003
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    127
    pretty much

    13.44

    25.25

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
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    La.
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    2,890
    AAAAHH!!,
    I don't know about that? 358" SM/BLK 10.5 to 1, 1471 20% O.D. 30lbs boost, sounds to me like that should blow the crank out the bottom and the heads off the block, but it don't, and i know there's a couple other guys on here besides myself that run atleast that much boost with SM/BLKs sucessfully on alcohol.

    JMO

    Zip.

  6. #6
    Junior Member JOURNEYMAN
    Join Date
    Oct 2004
    Posts
    29
    Using this I get pretty much the same numbers: http://www.wallaceracing.com/boost-c...ratio-calc.php

  7. #7
    Senior Member RACING JUNKIE
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    Dec 2004
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    austin texas
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    729
    zipper, your running 32 to 1 in a old sbc!!!! Lol!!!! Maybe we should weld our heads to the block!!! I AGREE. This formula can not be right, as the rpms increase you can not go by static compression to find actual compression at any gaven rpm.


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