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Compression Ratio's please explain?

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    #16
    Did anything come of Saab's work on variable compression ratio?
    Or did it spontaneously catch alight for no apparent reason & leave the engineers working on it stranded?
    Soft roaders represent an excellent compromise between the needs of the hardcore 4x4 user and the convenience of a city hatchback. Its clear to see why they have become so popular in todays society.

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      #17
      Originally posted by Forg View Post
      Did anything come of Saab's work on variable compression ratio?
      Or did it spontaneously catch alight for no apparent reason & leave the engineers working on it stranded?
      I remember reading about this, sounded too complex to be reliable.
      RB26......................Again

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        #18
        I think a bunch of people suggested to Saab engineers that they should prioritise improving reliability of their existing products

        fwiw, the engine had merit imho.
        John McKenzie

        Science flies people to the moon.
        Religion flies people into buildings.

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          #19
          Originally posted by jmac View Post
          I think a bunch of people suggested to Saab engineers that they should prioritise improving reliability of their existing products
          And their response was "shove a Holden engine in it" ... no wonder their cars always suck.
          Soft roaders represent an excellent compromise between the needs of the hardcore 4x4 user and the convenience of a city hatchback. Its clear to see why they have become so popular in todays society.

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            #20
            Originally posted by fly510 View Post
            I remember reading about this, sounded too complex to be reliable.
            atkinson cycle does what this engine tried to achieve in a much more simple way.

            Pity no one has put more effort into one, but being limited to a twin does have drawbacks.

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              #21
              there was a post like last week about mercedes fielding a 1.4 litre petrol motor that does 175kW and 360Nm or something like that

              DI and variable compression
              Originally posted by boxxx

              Deutsche Bahn Rail: Trains are a great way to get lots of people concentrated into a small area, like a camp.
              ACA/TT: Where's the line between a car enthusiast and hoon? There is none

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                #22
                Originally posted by fly510 View Post
                I remember reading about this, sounded too complex to be reliable.
                I think it had a head that tilted slightly on one side to raise/lower compression a bit or something along those lines.

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                  #23
                  they should've built it with a boost referenced inflatable head gasket, that would be even MORE simple

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                    #24
                    Originally posted by tremolo View Post
                    While we're on the subject, the new Golf GTi has a CR of 10.5:1. Considering turbo engines are usually much lower (8 or 9:1), how are they able to achieve this?
                    Bugger all boost.

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                      #25
                      Originally posted by EfiOz View Post
                      Bugger all boost.
                      Not really.

                      80's turbo cars ran less boost and high 7 low 8 compression - there has been quite a bit of advancement in engine design

                      they run around 9-10psi do they not?

                      "same" engine in the quattro runs 13-14psi.

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