the real deal or tripe? | FerrariChat
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the real deal or tripe?

Discussion in '308/328' started by Ferraripilot, Dec 16, 2009.

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  1. Ferraripilot

    Ferraripilot F1 World Champ
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    #1 Ferraripilot, Dec 16, 2009
    I just ordered a set of Ferrea valves and am pretty geeked about it, but I needed to check with the gurus here for a claim regarding their intake valves.

    The claim makes sense. The intakes are 18 degree rather than 25 or 35 or whatever they are, so they flow more. The claim is that they flow about 8% more. Is this possible? I would think 8% to be a pretty hefty claim. 2-3% sounds more believable, but I could be wrong.
     
  2. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #2 Rifledriver, Dec 16, 2009
    I use them for much the same reason as a Tubi. It is a good, quality product and any HP increase that may come my way is just a bonus.
     
  3. AZDoug

    AZDoug Formula 3

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    #3 AZDoug, Dec 16, 2009
    Are you/they referring to the valve topcut angle or something else?

    Doug
     
  4. Ferraripilot

    Ferraripilot F1 World Champ
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    #4 Ferraripilot, Dec 16, 2009
    Right Doug, it's the angle of the valve topcut. Much more shallow/flat looking than that of an original valve.
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #5 Steve Magnusson, Dec 16, 2009
    Do you have a link to their exact wording of the claim?
     
  6. Ferraripilot

    Ferraripilot F1 World Champ
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    #6 Ferraripilot, Dec 16, 2009
    F1162P

    Intake
    42.37mm
    8.0mm
    109.25
    7.3 tip length
    18º Super Flo (opposed to 25 degree stock)

    nothing was advertised. I was told of approx the increase when I ordered.
     
  7. AZDoug

    AZDoug Formula 3

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    #7 AZDoug, Dec 16, 2009
    Interesting.

    The 25* angle has long been used in US performance motors to get smooth flow around the valve and shorten the cone of convergent air flow past the valve.

    My NASCAR engine experience dates back to the late 1980's, and they used a 25* cut then. Dunno what they use now.

    Maybe with the higher engine speeds on these Fcar motors, or the more direct intake runner angle, a shallower topcut gets more air in the cylinder, as hypersonic airflow will follow a curved, or nearly curved surface.

    Doug
     
  8. AZDoug

    AZDoug Formula 3

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    #8 AZDoug, Dec 16, 2009
    I would think 8% is rather optimistic, or maybe compared to a worn out motor that needed a valve job to begin with, as an 8% power increase corresponds to an 8% airflow increase.

    Even a 2-3% power/flow increase is nothing to toss away, though.

    Doug
     
  9. Ferraripilot

    Ferraripilot F1 World Champ
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    #9 Ferraripilot, Dec 16, 2009
    Yeah it struck me as interesting as well, but explanation of it sounds reasonable enough. A more flat valve allows for more area around the valve which yields more flow. So calculate whatever volume is taken from our stock 25 degreeish valves to their hi-flow 18 degree valve and there is a factor in your potential flow increase. Hey, even if it is just 3%, that is some improvement. I think these are the valves superformance is selling as their 'hi-flo' valve as well and they have a nice pic of one on their website.
     
  10. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #10 Steve Magnusson, Dec 16, 2009
    OK, but still have to be a little skeptical myself that it would improve the flow by that much when the valve is in the maximum open position (all other things being equal). I was thinking that maybe the claim (legitimately) applies to improving the flow by 8% when the valve is just opening (which I could believe).
     
  11. Ferraripilot

    Ferraripilot F1 World Champ
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    #11 Ferraripilot, Dec 16, 2009
    Yes, at much smaller valve openings that claim makes even more sense. Thanks for that insight Steve
     
  12. CliffBeer

    CliffBeer Formula 3

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    #12 CliffBeer, Dec 17, 2009
    8% seems a little optimistic to me too. After all, the intake charge still needs to go around the same size diameter valve whether the edge is tapered 2 degrees or 50 degrees. In other words, a brick going down the road has a pretty horrible drag coefficient, even if you do round off the corners.......
     
  13. Ferraripilot

    Ferraripilot F1 World Champ
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    #13 Ferraripilot, Dec 18, 2009
    Nice analogy. I am thinking of going 1mm oversize on the intake which will give maybe 5% at higher lifts, but I will lose a little bit of velocity at lower lifts. Not sure yet......
     

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