Torque Cars

Principles of porting an engine and big valve conversions

Discussion in 'Engine questions' started by obi_waynne, 31 December 2014.

  1. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,306
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    The inlet and outlet ports on the engine block are usually larger than those of the manifolds that connect to them. This allows for scope in the manufacturing process to allow for mismatched alignment. Generally the engine ports are larger in the upstream flow direction avoiding turbulance but power gains can be made by matching these up.

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  2. TAZ67

    TAZ67 Full member

    Messages:
    16
    From:
    Scotland
    Car:
    Vauxhall Astra mk4
    Matching manifold to ports definitely helps increase power. Having pins fitted is needed so alignment always matches. Turbulence of incoming air/fuel is beneficial. Port shape also play's a big part. Combustion chamber can also determine how well mixture behaves entering, then how well flame front expansion spreads out efficiently at tdc. Understanding engine's is hard as not all engine's behave the same!?
     
    obi_waynne likes this.
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