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Thread: How would ported head affect ignition needs?

  1. #21
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: How would ported head affect ignition needs?

    First have to separate squish and quench, totally different but often in the same place.

    Traditional thinking was/is approx. .035" ideal squish, but recent trends indicate approx. .100" in a highly boosted engine.

    Thanks
    Randy


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  2. #22
    turbo addict
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    Re: How would ported head affect ignition needs?

    OminLuvr ... no bashing intended. If anything in my posts gave that impression I apologize.

  3. #23
    turbo addict
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    Re: How would ported head affect ignition needs?

    no way at all! id just like to here the other side, or your opinion of what the e85 did to the equation to eliminate the knock. seriously, I don't get on any forums but this one, my knowledge is from here, first hand, or when engine masters magazine used to be at 7-11... I bought the import magazines to check out the chicks, except d-sport had both...

    First have to separate squish and quench, totally different but often in the same place.
    this is true and I mentioned the fact that I left the "quench" pads alone on my "g-head" and went with a .038 squish area, and would have liked to go tighter to play around, but had to get the shortblock assembled and installed, didn't want it to go back to the machine shop again...

    anyways, any more answers on what all changed? cam timing? tune? so far we know ported head, bmf intake, then e-85 to get rid of knock

  4. #24
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: How would ported head affect ignition needs?

    Late but your compression is too high. Seem to recall all my 2.5 builds were around 150.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
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    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  5. #25
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: How would ported head affect ignition needs?

    I'm running TBI pistons in my 8v van and even with that much more compression ratio, I still don't detect any knock counts on a stockish setup until ~13 psi. I think it's almost a full point higher compression and it still didn't give me knock counts at 7 psi.

    Dont push the red button.You hear me?

  6. #26
    turbo addict
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    Re: How would ported head affect ignition needs?

    Cylinder #2 is using oil. Plug has large amount of deposite on it when I checked the plugs. Still, using a set of new AR15 plugs, E85 and 20psi, car made 290whp.

    Will address the oil using issue later, going to enjoy a bit first.

  7. #27
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: How would ported head affect ignition needs?

    Well, you basically have intake guide or ring seal issues, in that case. Do you have smoke? They're fairly easy to differentiate based on when the smoke gets better or worse vs manifold vac/boost.

    I saw this a while back and thought it was clever.


    Dont push the red button.You hear me?

  8. #28
    Supporting Member Turbo Mopar Contributor rx2mazda's Avatar
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    Re: How would ported head affect ignition needs?

    Quote Originally Posted by Vigo View Post
    Well, you basically have intake guide or ring seal issues, in that case. Do you have smoke? They're fairly easy to differentiate based on when the smoke gets better or worse vs manifold vac/boost.

    I saw this a while back and thought it was clever.

    B.Slowe checks oil ring tension this way on the motors he rebuilds. I was like wtf is that for lol.

  9. #29
    Mitsu booster
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    Re: How would ported head affect ignition needs?

    that is some good stuff there with that oil ring .. learn something new every day.

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