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Compression Ratios

Discussion in 'A4/S4 forum(B5 Chassis)' started by Markey, Nov 22, 2004.

  1. Markey
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    Markey Active Member

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    [Nov 22, 2004]
    Im a novice when it comes to this subject im looking at the below, and have no idea what the compression raitos mean and what i can expect with each application.

    JE Forged Piston Set - 1.8T 5V - 9.0:1CR
    JE Forged Piston Set - 1.8T 5V - 9.2:1CR
    JE Forged Piston Set - 1.8T 5V - 9.5:1CR

    Please Help, need to know what im talking about so i can compare them with others, and choose the ones i want.
    #1
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  3. Markey
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    Markey Active Member

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    [Nov 23, 2004]
    Is that right as im just getting some prices of the web and the 9.0:1s are cheaper than the others and i thought they would have been more expensive being the better performers.
    How strange
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  4. imported_ZeroK66
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    imported_ZeroK66 Guest

    [Nov 23, 2004]
    Just cause they are lower comp doesn't mean they are stronger...

    You have to make sure you get a set of forged ones... and then clarify which are the "strongest".

    I know Jabbasport offer the 8:1 pistons that are nearly 1900cc... they are JE pistons.
    #3
  5. Markey
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    Markey Active Member

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    [Nov 23, 2004]
    Think im just going to stick with the S3 pistons and conrods for now then i can probably get them cheaper.
    #4
  6. Danielson
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    Danielson Member

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    [Nov 23, 2004]
    do you need to rebuld, or u just power hungry. i wana see some pics of your intercooler, as i think i will have to do the same soon, i also av headlight wash, i wana c yours so get some pics up buddy.
    #5
  7. Markey
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    Markey Active Member

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    [Nov 23, 2004]
    Im am a crazy power hungry person. Im thinking S3 pistons with bigger injectors and some lightened components will take me to near 280BHP and then ill be happy for a while.
    I like to have the same amount ot power under my foot as most women have under their thumbs. /ubbthreads/images/graemlins/wink.gif

    Ill see what i can do for you tomorrow i need to get someone where set up to host the pics. Ill see if i can get some detailed ones for as it is not on the car at the moment as i had to take it off to have some warrenty work done. Naughty Me!!!
    #6
  8. imported_ZeroK66
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    imported_ZeroK66 Guest

    [Nov 24, 2004]
    I ran the S3 motor (210BHP) with an IHI turbo w/ std S3 injectors and the car ran 340BHP... the injectors could not take anymore. 380 would have been possible with larger injectors & higher pressure fuel pump... but 380 would have been con-rod breaking territory so didnt bother.
    #7

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