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Thread: Modifying engine parts

  1. #1
    Regular Member Spikey©'s Avatar
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    Default Modifying engine parts

    Posted this question elsewhere but hoping it might get more attention here:

    Can you take a standard Vx Inlet Manifold and a standard Vx Throttle Body and modify/improve them for performance gains?

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    Regular Member The Doc's Avatar
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    Ring me when you can on the mobile mate. Short answer is yes, long answer was on here but the ******* forum crashed
    Last edited by payney; 16th August 2006 at 16:52.

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    Regular Member The Doc's Avatar
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    Also the older Vectra Bs used a 4 bar fuel reg. Wonder if that would fit the C

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    Regular Member payney's Avatar
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    Interesting i would'nt mind knowing this question too John (is it possible)?

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    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    Quote Originally Posted by CDTi
    Ring me when you can on the mobile mate. Short answer is yes, long answer was on here but the ******* forum crashed
    Come on spill the beans.

  6. #6
    Regular Member The Doc's Avatar
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    Sorry got annoyed earlier after typing for 15mins and digging out info and I got "There is a slight problem with our database"

    Right the standard inlet is restrictive but it can be improved. Ideally for best results the head should be removed.

    Basically you can enlarge the throttle body by removing it and thining it out as much 'meat' is on there. But you also have to increase the size of the butterfly valve as well. I have done this before on cars and it helps. For best results I also would remove the inlet manifold and exhaust manifolds. Basically you use a porting and polishing kit to match up the inlet to the heads and smooth out all the passage ways. I have done this quite a few times for my cars and the increases are good! But it takes quite a while to do.

    Inlet manifolds and heads have a mismatch in size and don't perfectly match and causes turbulance. Pic below shows this well.



    Give you an idea what it looks like when you are done



    They reckon head work on a 300bhp gives you around 20bhp upgrade but increases flow and driveability. So 150bhp gives 10bhp.

    Unfortunately tuning a N/A you have to do these bits are pieces in stages as you can just throw a remap on it and get 40bhp.

    Head work will help, but porting the inlet and exhaust manifolds and head inlets/outlets will help with the engine in tact.

    I can do this and show anyone if needed

    Few links:
    http://www.sa-motorsports.com/diyport.shtm - Excellent guide

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    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    Now that took some serious reading! Dont think ill be stripping the head just yet.

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    Regular Member The Doc's Avatar
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    You don't have to strip the head to port the inlet manifold and ports on the head, and the exhaust manifold and ports on the head. Can be done in situ.

    Good read though isn't it.

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    I was concidering taking mine apart and playing a bit but I was worried that if I disconnected bits, it might set off the imobilizer?

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    Regular Member Spikey©'s Avatar
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    Good stuff John. Think i'll get the inlet manifold and throttle body and have a play as they are peanuts to buy. I'll keep my original bits to put back on if there's a problem.

    Spoke to Cabby on the phone just now and if I can find the right people, ports and head can be polished fairly cheap so looks like this might well be a flier

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