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3 angle or 5 angle

Discussion in '308/328' started by Ferraripilot, Mar 25, 2010.

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  1. Ferraripilot

    Ferraripilot F1 World Champ
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    #1 Ferraripilot, Mar 25, 2010
    Need some Ferrari expert advice on this one. The local machine shop is suggesting I go 5 angle if it benefits the flow for these heads. They had advised 3 angle are better for some. Anyone have a rough answer? Common sense tells me 5 angles = better flow
     
  2. mk e

    mk e F1 World Champ

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    #2 mk e, Mar 25, 2010
    Normally that is the case.
     
  3. mike996

    mike996 F1 Veteran

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    #3 mike996, Mar 25, 2010
    True but in this case, whether it's worth the money is the issue. IMO, it is not. The more angles a valve job (properly done, of course) the better the flow theoretically. BUT the more angles, the faster the wear because the sealing area is much narrower. Competition engines normally have a 5 angle or even a radiased surface but they are rebuilt frequently. For street use an 3 angle is plenty sufficient. The difference in flow is not worth worrying about for street driving. Mopar hemi Barracudas in SS trim (currently turning 8.29 in the 1/4 mile) pick up about 15 HP with a 5 angle over 3 angle valve job. That's 15 HP at almost the 900+ HP level at 8k RPM. So if one of our Ferrari motors even managed to pick up 3 HP, I'd be impressed.
     
  4. Ferraripilot

    Ferraripilot F1 World Champ
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    #4 Ferraripilot, Mar 25, 2010
    thanks guys. good advice. Thing is, my shop charges the same amount for 5 as the do for 3, strange I know. Henson engines in Yukon, OK is the place. I will be impressed if it makes 1 bhp more than a 3 angle. Don't think it matters a ton for this application.
     
  5. mk e

    mk e F1 World Champ

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    #5 mk e, Mar 25, 2010
    Last edited by a moderator: Sep 7, 2017
    I use a formed seat cutter so it makes no difference at all 3 angle , 5 angle or my personal favorite 4 angle 3 radius.
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  6. Ferraripilot

    Ferraripilot F1 World Champ
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    #6 Ferraripilot, Mar 25, 2010
    too cool. thanks mark
     

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