Porting the throttlebody
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Northstar Engines and System Technical Discussion Discussion, Porting the throttlebody in Cadillac Engine Technical Discussion; Anyone ever do this? Is it worth a gain in the northstar?...
  1. #1
    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Porting the throttlebody

    Anyone ever do this?


    Is it worth a gain in the northstar?

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Porting the throttlebody

    Lots of posts and threads on this in this forum and in Seville a year ago.

    It may be good for a couple of hp up above 6,000 rpm.

  4. #3
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    Porting the throttle body is not going to get you much, if anything.

    Boring the throttle body and installing a larger (80mm) butterfly will gain you about 5hp and 10-15 ft-lb from 3000 rpm up.

  5. #4
    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    I DO have a 80mm ford TB laying around with buttertterfly valve inside, along with a small engine hone

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    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    I havn't done it but most of the dyno tests show an improvement on FI engines without hurting bottom end as a bigger carb would.

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    msta293412 is offline Cadillac Owners Fanatic
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    Re: Porting the throttlebody

    I say , if you have the stuff in your possesion....DO IT!...It wont cost you anything and your looking at at least 5hp.......I know I would.....then again people around here now me as a mod junkie.......please refrain SUBMARINER.

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    Submariner409's Avatar
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    Re: Porting the throttlebody

    msta, If the OP wants to modify a car, then he/she certainly may do so. The thread asks for info and experience on porting a throttlebody and that's what it got.

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    Re: Porting the throttlebody

    Quote Originally Posted by submariner409 View Post
    msta, If the OP wants to modify a car, then he/she certainly may do so. The thread asks for info and experience on porting a throttlebody and that's what it got.
    Don't mind these guys Sub. Reality is not one of their strong points.
    Don't mess with Binky Bear!


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    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    There was someone selling ported TB's here a few months ago. I don't know if anyone bought one. They could give a review/opinion.

  11. #10
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    Re: Porting the throttlebody

    I have a bored out 80mm & oversized BFV from one of the fellas here on the board a couple years back. Any gain you won't feel, though I consistently measured a small mpg boost ~ 1-2mpg but that could just be statistical noise and it was only on highway tanks, is it worth it? not really imo, if you want power spray some juice or read the mega post to get more ideas...

  12. #11
    msta293412 is offline Cadillac Owners Fanatic
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    Re: Porting the throttlebody

    SUBMARINER...I should have put a smiley face after my statement...it was tongue in cheek...I was just kidding around........Your response leads me to believe you took my posting the wrong way....Hey, I respect my elders

  13. #12
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    Re: Porting the throttlebody

    I did not perceive this post to be offensive or disrespectful to anyone

    Quote Originally Posted by msta293412 View Post
    I say , if you have the stuff in your possesion....DO IT!...It wont cost you anything and your looking at at least 5hp.......I know I would.....then again people around here now me as a mod junkie.......please refrain SUBMARINER.

  14. #13
    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    Tell me, will a intake manifold from ANY year northstar swap over or was that changed in 00?



    I am not looking for gains at the moment, i want to see what i can do within that intake manifold.

  15. #14
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    Re: Porting the throttlebody

    There are a couple of different manifolds with different relief valves and connectors. Find one for your year to experiment with.

    Take some advice from an old head porter and racing engine builder: Don't get crazy, just clean up flashing corners and sharp edges. Imagine where the airflow is going before you grind, and keep it simple. Those sanding drums you have, as well as the stones in the die grinder kit, will shed abrasive grit and leave it everywhere in that manifold, and, because of the curved tuned runner configuration a thorough cleaning is nearly impossible without hot tanks and high pressure cleaners. Pay an engine or carb shop to properly clean up your mess...........

    To polish a manifold such as you are going to try will give you a slight airflow gain above 5,000 rpm or so. You will see nothing below Wide Open Throttle. A good engine or head shop could do before and after flow bench comparisons........you may be disappointed. Not saying "Don't do it"......just saying don't expect miracles (even minor ones.)

  16. #15
    Crown Vic Owner is offline Cadillac Owners Connoisseur
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    Re: Porting the throttlebody

    Im doing this as a learning experience . I am expecting nothing, anything i do gain is unexpected.

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