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Thread: Why is the end of the air intake pipe...

  1. #1
    Regular Member sheepish's Avatar
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    Default Why is the end of the air intake pipe...

    I was idly browsing under the bonnet of my 1.8 petrol this evening and noticed the end of the air intake pipe was behind the passenger side of the grille, with the pipe running over the top of the radiator to the air box on the drivers side of the engine bay.

    I'd just got home from work, 36 mile run, so everything was warm including this pipe. Has this been done deliberately to warm the air entering the air box, as looking at it, it could have easily been placed behind the drivers side of the grille with a shorter pipe???


    Do (petrol) Vectras benefit from having a warm air intake?

  2. #2
    Regular Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

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    no cold air is what they need as its denser and contains more oxygen.....

  3. #3
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    Warmer air helps with MPG.

  4. #4
    Regular Member sheepish's Avatar
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    Quote Originally Posted by rushy View Post
    Warmer air helps with MPG.
    Mmmm, this is what I've read. You can't heat the fuel so warm air helps atomisation and therefore complete burn.

    But it depends on the car, would even warmer air help mpg further?

  5. #5
    VIP-Member Das's Avatar
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    Vehicle : Lada

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    Year : 1954

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    Default

    I replaced the huge one on my 1.8 with a shortened one from a 2.2(i think) last year. Dont think its made a difference but it meant I could add the slam panel/radiator surrounds from the Diesel. As for warm air, well that theory is possibly correct as in the winter you do tend to get less mpg.
    BTW going back to your other thread Ive stopped using CC and drove like a Nun yesterday, managed to achieve 46.2mpg on the GID, thats 1.2 mpg more than my best. Sitting at 43.4mpg today. TBH I trust my GID, its normally +/- 1mpg checking it the old fashioned way.

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    Regular Member rushy's Avatar
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    Engine : Z22SE (2.2 Petrol)

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    You can get better MPG with your right foot than CC as well as you can feather the throttle better, the CC seams to pulse the power more. The 2.2 pipe is just as long mate, on the move the temps wont make much difference TBH. Turbo engines have intercoolers so by the time the charge gets to the cylinders you will never see any difference in temps with the two pipes, this is probable why NA engines have the longer pipe. There must be a reason for the long pipe, why would they put a longer more expensive to produce part on a car when a shorter cheaper one would do.

    It could also be something to do with Torque as NA tuning relies on very subtle changes in airflow, RR's show NA 2.2 in the VX220 lose torque on shorter intake pipes, although these were after filter not before.

  7. #7
    Regular Member sheepish's Avatar
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    Quote Originally Posted by DasArab View Post
    BTW going back to your other thread Ive stopped using CC and drove like a Nun yesterday, managed to achieve 46.2mpg on the GID, thats 1.2 mpg more than my best. Sitting at 43.4mpg today. TBH I trust my GID, its normally +/- 1mpg checking it the old fashioned way.
    ;-)

    Once you start trying to improve your mpg, you can't help yourself. Increasing my tyre pressure to 36psi all round I've managed 53.26 mpg (worked out the old fashioned way) which is 2 mpg'ish more than my best. I'm sure the improvement would have been better if it weren't for the snow and a fair bit of rain we've had recently.

    What next... block the drivers side of the grille and the fog lamp holes, lower the suspension, then I think my rear seats are living on borrowed time. :-)

  8. #8
    Regular Member MalcGSI's Avatar
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    Quote Originally Posted by rushy View Post
    this is probable why NA engines have the longer pipe.
    The Gsi has the short intake.

  9. #9
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    warm air is the key to mpg hence using the egr to aid in totally burning fuel rather than allowing some to escape straight out through the exhaust.

    I think CC is better than the steadiest of feet- when used properly but we all drive differently and in different environments so it's almost impossible to measure really.

  10. #10
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

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    Quote Originally Posted by DasArab View Post
    I could add the slam panel/radiator surrounds from the Diesel
    Whats this m8?? Pics?

    EDIT:

    This bit?

    Last edited by rushy; 15th April 2012 at 22:55.

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