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Which is right: bigger/smaller cylinders?

MarkLand Jul 24, 2018

  1. MarkLand

    MarkLand New Member

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    Hi,
    Given a compression ratio of 9.3:1.
    If we cannot increase the air flow (restrictive intercooler), but have a very strong turbo.
    If the temperature is constant at 18°C.
    If knocking is known to appear at 14:1.(arbitrary value, may be much more)
    If the engine runs e85, mostly.

    Is it better to increase the capacity of the engine or to sleeve it, reducing the -forged- pistons size?
    Effects on torque?

    I wonder because in my opinion, in this precise context, a smaller cylinder could make up for the restricted air flow, thus increasing the power output by improving the compression ratio. But too low and you loose too much torque/capacity and the big turbo becomes useless (oversized).

    So, for example, going from 4.0tfsi to a 3.8 or 3.9 (yes, on a rs6).
    What is your opinion?

    Sent from my ALE-L21 using Tapatalk
     
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  3. MarkLand

    MarkLand New Member

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    Not modifying turbo boost

    Sent from my ALE-L21 using Tapatalk
     

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