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Thread: Compression

  
  1. #1
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    stevenlcroucher's Avatar
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    Compression

    I was under the impression that the letter at the beginning of GM engines signifies the compression. Is that right? If it is, would that mean the older SRi 2.0 engine (X20XEV) is different to the newer Turbo charged unit? (Z20LET)

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    AstraG's Avatar
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    i think the turbo unit is lower compression than standard in order to run the turbo

  3. #3
    Don't know whether the letters relate to this but the following is true

    Z20let runs 8.8:1 compression

    The 2.2 SRi engine runs 10.0:1

    As I said someone might know if the letter relate or not !

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    Wooly MK4's Avatar
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    no its the 1st letter after

    TRUST me

    so for X20XEV its the X
    for Z20LET its L

    there is a new engine in the vectra sri turbo coming out soon

    the Z20NET which will be the N

    Z22SE etc etc

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    SteSri's Avatar
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    mine is runnin a higher compression as ive fitted a gas flowed head that is skimmed rite down 2 minimum.............


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    Steve's Avatar
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    If Vauxhall follow the same system as they do where I work (Toyota) then the numbers for the engines are a load of old horse sh*t. Toyota went from the 'A' type engine in the old Corolla (WRC shape) to the 'ZZ' in the new Corolla.

    What the ***** happened to the letters in between?


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