Torque Cars

High performance valve springs

Discussion in 'Engine questions' started by obi_waynne, 12 June 2015.

  1. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,343
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    The valves are like the doorways into the engine and control the flow of the intake air and fuel and then after combustion they control the exit of the exhaust gases. As you can guess the valve springs work incredibly hard, and as you increase the power of your engine the valve choice is vital. TorqueCars will now take a look at the many considerations taken into account when selecting valve springs.

    Continue reading... or post your comments below on this article.
     
  2. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,900
    From:
    Brisbane
    Car:
    JB Starion
    When I bought my cams I also bought the recommended springs to go with them from the same cam shop.
    Would have loved to get the light weight titanium retainers as well.
    .
     
  3. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Dual springs are often chosen as a means to work around resonance characteristics.
     
  4. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,343
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    Tell me more about the dual springs.
     
  5. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    One day when I get some time to write properly again. It's not a new idea though, even the ancient BL O-series and S-series engines used dual springs.
     
  6. old-git

    old-git Moderator

    Messages:
    9,182
    From:
    Essex
    Car:
    Elan & Robin Hood
  7. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Thankyou!
     
  8. TAZ67

    TAZ67 Full member

    Messages:
    16
    From:
    Scotland
    Car:
    Vauxhall Astra mk4
    Valve Springs can also lose power if you use a spring combination that is over specced for your engine. Cam can prematurely wearing out aswell as turning forces having more forces to deal with so power lose is commonly the result. Pointless fitting stronger springs that are capable revving to 8000rpm when your engine can only make maximum power at 6000rpm. More power comes from parts made lighter and using a Beehive type valve spring specced to your reciprocating parts being used. My 4cyl 16v can safely go to 9000rpm without valve bounce but pointless when power drops off below 8000rpm with the cams I fitted. I use lightweight valves from Supertech and titanium spring caps with only single spring of the Beehive design rated at 125k.p. 9000rpm + . Hope this helps understanding parts working together when specced for engine capability and characteristics.
     
    obi_waynne likes this.
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