Draw Thru lean/fat
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Draw Thru lean/fat

  1. #1
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    Default Draw Thru lean/fat

    I pulled a couple plugs tonight on the drivers side (because they are easier to get to), #1 & #7...#1 is showing a little lean, #7 is showing a bit fat.

    It's intercooled and I have a Team G single plane dominator intake.

    What can you do about that?

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  3. #2
    gn7
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    Stop accelerating so quickly. The insane G forces are driving the fuel to the back of the motor.



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    Quote Originally Posted by gn7 View Post
    Stop accelerating so quickly. The insane G forces are driving the fuel to the back of the motor.
    Now that's funny! I've actually seen someone stagger the jets
    on a tunnel ram like that! progressively leaner to the rear of the motor!
    then I asked him " when you are driving down the road with the windows
    up, and you spill your coffee, does it blow into the back seat, or land
    it your lap?

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    Quote Originally Posted by terrible_buddhist View Post
    I pulled a couple plugs tonight on the drivers side (because they are easier to get to), #1 & #7...#1 is showing a little lean, #7 is showing a bit fat.

    It's intercooled and I have a Team G single plane dominator intake.

    What can you do about that?
    Thats the main drawback to the old draw through system, poor distrubution. At idle it will puddle some fuel in the turbos & air box under the carb then when you rev it up it will blow a big slug of fuel through the engine and will be fat for a sec or two then lean up as you run on up in the rpms. Makes it hell to get anything from reading the plugs. Mine always looked fat, buy it ran great and never hurt anything for 10+yrs.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Running the air/fuel mixture through the intercooler is so wrong from an engineering standpoint.
    The cold intercooler is acting like a dehumidifier TRYING to settle out the fuel.
    You couldn't really even call it old school because it NEVER was the way to go.

    Now someone can say, "I've run it this way for 20 years"

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    Quote Originally Posted by Unchained View Post
    Running the air/fuel mixture through the intercooler is so wrong from an engineering standpoint.
    The cold intercooler is acting like a dehumidifier TRYING to settle out the fuel.
    You couldn't really even call it old school because it NEVER was the way to go.

    Now someone can say, "I've run it this way for 20 years"
    Some one already did

  9. #7
    gn7
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    Quote Originally Posted by Unchained View Post
    Running the air/fuel mixture through the intercooler is so wrong from an engineering standpoint.
    The cold intercooler is acting like a dehumidifier TRYING to settle out the fuel.
    You couldn't really even call it old school because it NEVER was the way to go.

    Now someone can say, "I've run it this way for 20 years"
    I believe the term that fits this best is a condenser. Anytime you have a liquid that as been vaporized, then is pressurized and cooled back to a liquid, it is refered to as condensed. But you have the right idea. It sucks and is not very distribution friendly.
    Quote Originally Posted by terrible_buddhist View Post
    Some one already did
    Don't remember anybody saying it works. HASS made a reference to a draw thru system, but not intercooled. There is a huge difference



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    Quote Originally Posted by gn7 View Post
    I believe the term that fits this best is a condenser. Anytime you have a liquid that as been vaporized, then is pressurized and cooled back to a liquid, it is refered to as condensed. But you have the right idea. It sucks and is not very distribution friendly.


    Don't remember anybody saying it works. HASS made a reference to a draw thru system, but not intercooled. There is a huge difference
    my uncle ran his with a 580 and over 20lbs of boost for well over 20 years, but he also had nos plates and stuff hooked up to pressure switches and the like.

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    by the way, I am running 80's in the primaries and 90's in the secondaries...the carb is boost referenced.

    should I jet up a bit?

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    Quote Originally Posted by gn7 View Post
    I believe the term that fits this best is a condenser. Anytime you have a liquid that as been vaporized, then is pressurized and cooled back to a liquid, it is refered to as condensed. But you have the right idea. It sucks and is not very distribution friendly.
    I stand corrected. I guess it's only called a dehumidifier when it's in a house.
    My house is only good for ...............less than 1# of boost or I can't close the doors.

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    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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    Quote Originally Posted by Unchained View Post
    I stand corrected. I guess it's only called a dehumidifier when it's in a house.
    My house is only good for ...............less than 1# of boost or I can't close the doors.

  14. #12
    gn7
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    Quote Originally Posted by Unchained View Post
    I stand corrected. I guess it's only called a dehumidifier when it's in a house.
    My house is only good for ...............less than 1# of boost or I can't close the doors.
    You kind of had the right idea. A de-humidifier consdenses water vapor from the air and then disposes of it(or at least should). The fix to the boost problem in your house can be easily solved by a waste gate. The easiest is the sliding window type. But you still have to be carefull, because the walls just won't take the pressure some people think.



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