Are the EVF and EV3,4,5 the same valves? | FerrariChat
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Are the EVF and EV3,4,5 the same valves?

Discussion in 'Technical Q&A' started by 24000rpm, Feb 24, 2016.

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  1. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,653
    China and California
    #1 24000rpm, Feb 24, 2016
    Last edited by a moderator: Sep 7, 2017
    Are they interchangeable? Basically are the clutch valve interchangeable with selection valves? It seems practically the EV3,4,5 will never go bad since they are far less frequently activated than the EVF.
    so I was thinking to take a spare EV3 to replace a bad EVF. Is that something smart or stupid?

    Also, the 2 screw-like things in red circle, what are their functions? WSM never mentioned these.
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  2. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,315
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    #2 tazandjan, Feb 24, 2016
    Call Serkan at GTE Engineering and he should be able to tell you. He overhauls actuators.
     
  3. eric355

    eric355 Formula 3
    Silver Subscribed

    Nov 30, 2005
    1,233
    Toulouse (France)
    Full Name:
    Eric DECOUX
    #3 eric355, Feb 25, 2016
    EV3, EV4, EV5 and EVF are all 4 Proportional Flow Valves. EV3, EV4 and EV5 are used as on/off valves, while EVF is controlled by a PWM signal. Though, not sure they have the same flow/current characteristics. Let us know if you make a try!

    The small screw is the bypass screw which allows to connect the HP side to the LP side in order to release the high pressure.
    The large screw is for the pressure relief valve, again it connects the HP side to the low pressure side in case of excessive pressure.
     
  4. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,653
    China and California
    #4 24000rpm, Feb 25, 2016
    will try and let you know

    for the 2 screws , can you provide some more info on how they work?



     

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