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Compression Ratio

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    #1

    Compression Ratio

    i was wondering
    -what is a better compression ratio for N/A motors (high or low) and
    -what is a better compression ratio for Forced Induced motors (high or low).

    also what are your guys preferences.
    Tags: None
    #2
    N/A-High
    F/I-Low
    F/I Diesel-High
    -1991 Honda Accord LX H22a-

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      #3
      generally, i think N/A motors are better with high compression ratios for better performance and low for boosted motors. but i think a lot has to do with how well you tune it

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        #4
        yeah, higher compression is better for n/a motors because a higher compression=more air in the cylinders=more power

        lower compression for turbo engines (assuming we are talking about gasoline engines and not diesel) is better because a lower starting compression allows for more boost. if you run higher compression on a turbo engine, you'd run into things like pre-ignition, which can screw your engine

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          #5
          Originally posted by Catch-22
          yeah, higher compression is better for n/a motors because a higher compression=more air in the cylinders=more power

          Its not so much more air in the cylinders, it's that you are compressing the same amount of air a lot more, and getting a bigger bang out of it.


          For turbo, though, you do have more air in the cylinders, which effectively raises the compression ratio, giving you a bigger bang.
          1992 Prelude S w/swapped H22A

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            #6
            not quite sure, but i heard with higher compression ratio, you need to use higher octane gasoline in order to avoid detonation

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              #7
              Originally posted by ja23merz
              not quite sure, but i heard with higher compression ratio, you need to use higher octane gasoline in order to avoid detonation

              yep, thats why you have to run premium in more expensive cars

              Comment

                #8
                no matter if you're N/A or F/I a high compression engine will always make more power, all other variables being equal. The problem with combining forced induction with high compression is that it makes it very difficult or impossible to tune on pump gas. Therefore low compression is obviously the choice when trying to run forced induction with pump gas.

                direct injection and way more advanced computers are currently allowing manufactures to run a bit higher compression ratios in conjuction with forced induction.
                1990 Frost White EX Coupe F23A1 - PART OUT
                01 DC4

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