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    1990RANGER's Avatar
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    Port Area Question

    Is it bad to have a port area thats larger than the calculated "minimum usable vent area"?

    Cause on the box I'm designing, I need a minimum vent area of 21.69 inch^2, but is there like a maximum measurment you shouldnt pass?
    Last edited by 1990RANGER; 06-30-2005 at 05:28 PM. Reason: had to tweak question



    1990 Ford Ranger XLT Extended Cab
    2.9L V6




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    Re: Port Area Question

    Yes.




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    Re: Port Area Question

    Quote Originally Posted by 1990RANGER
    Is it bad to have a port size thats larger than the calculated "minimum usable vent area"?

    Cause on the box I'm designing, I need a minimum vent area of 21.69 inch^2, but is there like a maximum measurment you shouldnt pass?

    there is a ratio that someone will post who is smarter than me...



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    Re: Port Area Question

    Quote Originally Posted by g30ffr3y
    there is a ratio that someone will post who is smarter than me...
    Anyone feel free to speak up then...




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    Re: Port Area Question

    For a given tuning goal: You have to realize that the larger Your port mouth is, the longer the port will be, therefore taking up more volume, therefore raising tuning.



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    Re: Port Area Question

    Fs=0.159*(((Av*(1.84*10^8))/((Vb*1728)*(Lv + 0.823*(Av^0.5))))^0.5)



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    Re: Port Area Question

    Quote Originally Posted by cjjackson85
    Yes.
    Alright. Well then lets assume the box has a min. port area of 21.69 inch^2. Would i be bad if the port didn't go all the way across the the chamber?



    1990 Ford Ranger XLT Extended Cab
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    Re: Port Area Question

    Quote Originally Posted by 1990RANGER
    Alright. Well then lets assume the box has a min. port area of 21.69 inch^2. Would i be bad if the port didn't go all the way across the the chamber?
    MS Excel is Your friend...

    Quote Originally Posted by NjccBflo
    Fs=0.159*(((Av*(1.84*10^8))/((Vb*1728)*(Lv + 0.823*(Av^0.5))))^0.5)



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    Re: Port Area Question

    Quote Originally Posted by NjccBflo
    MS Excel is Your friend...
    Yea, LOL



    1990 Ford Ranger XLT Extended Cab
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    Re: Port Area Question





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    Re: Port Area Question

    But I still need to know, would it be bad if the port mouth didn't go all the way across the chamber but the port wall did?



    1990 Ford Ranger XLT Extended Cab
    2.9L V6

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    Re: Port Area Question




    What the f00k happened to this place?

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    Re: Port Area Question

    Quote Originally Posted by 1990RANGER
    But I still need to know, would it be bad if the port mouth didn't go all the way across the chamber but the port wall did?
    no. i've done it a few time before.



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    Re: Port Area Question

    It may look fugly, but if you mean what i think you mean, it will be cool. just center the port so it doesn't look fugly

    edit:

    I am thinking that on the inside, you wall off the unused area on the side of the port, which is equal size from the mouth to the azz, not the width of the box.

    if this is not true, listen to nick



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    Re: Port Area Question

    Okay. I really dont mean to beat this topic to death since u guys already answered my question, but I just want to make sure I'm on the same page as u guys cause it seems like I may be almost done with my design .

    In the pic below the red hatched area is the the exposed port mouth and the yellow hatched area is the intrenal port space created by the back wall and port wall.



    So still, there is nothing wrong with this design?



    1990 Ford Ranger XLT Extended Cab
    2.9L V6

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