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Better head for boost?

Discussion in 'Engine Building' started by FLounder, Feb 9, 2009.

  1. FLounder

    FLounder power hungry VIP

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    so there are some conflicting opinions i have heard on this.... which head is better for forced induction.... GSR or b16a??
     
  2. efhondakid

    efhondakid My name is Byron. VIP

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    The B16 flows better, but the GSR cams are better than the B16s, so a B16 with GSR cams is about the best budget boost option.
     
  3. austin20110

    austin20110 New Member

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    +1


    heard a dude driving a camaro tell me "theres no replacement for displacement" but I waxed him in a 1.8 soo yea


    if your on a budget a b16 head and some gsr cams would run you like 300 bucks, if you buy them used...


    cant wait to see a build thread
     
  4. je power

    je power New Member

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    i disagree the gsr flows way better they got bigger ports
     
  5. FLounder

    FLounder power hungry VIP

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    well i have a b16a head already... someone wants to trade me a gsr head though, so im thinking about it. both have original cams.
     
  6. newb

    newb phresh VIP

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    Actually neither flows better. The chamber shape is what makes one handle boost better than the other, and that would be the GSR.

    EDIT: Theres a flow chart on www.b20vtec.com with both heads on it. Theyre almost identical. For one reason or anotehr I cant post the chart from work. :shrug:
     
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  7. 99sidude

    99sidude Moderator Moderator VIP

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    The gsr head has something called quelch pads. These do something to help ward off detonation. I have read this from a couple of different sources, but am not sure exactly what they are.
     
  8. newb

    newb phresh VIP

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    They are the flat spots on the sides of the chambers under the valve seat.

    They also handle boost better because of their "Pent Roof" chambers. The shape of the chamber is said to direct the extra air flow better.

    EDIT: http://img185.imageshack.us/img185/9868/dsc033756es.jpg
    The sides of the valves closest to the chamber are sitting on the quench pads.
     
    Last edited: Feb 10, 2009
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  9. K2e2vin

    K2e2vin Senior Member

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    B16s are pent roof too, as are most modern Honda engines. Quench pads only work if the pistons are designed to work with them.

    I'd choose the B16A head simply because there's more intake manifold options.
     
  10. newb

    newb phresh VIP

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    I thought they were semi-hemispherical.
     
  11. K2e2vin

    K2e2vin Senior Member

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    Nope, all pent-roof. The crease may not be noticeable, but they're all pent-roof design.

    Here's a pic from Endyn where you can see it well:
    [​IMG]
     
  12. newb

    newb phresh VIP

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    Ahh, I see it now. Thanks for the pic.
     
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