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Thread: 6A13TT Intake plenum, aftermarket?

  1. #21
    Davezj's Avatar

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    adam i have a question for you about the design of you plenum.
    this just an observation not a criticism, please don't take it the wrong way, i love the work you do and the fact you are happy to share your experiences.

    ok to the question,
    how are you going to fix the 2 piece shaped metal hood that you have formed to the flat oval piece that you bolt to the top of the inlet manifold.
    if you are going to weld it into one solid piece, it raises the question how are you going to get a spanner on the bolts to do them up so it will bolt down to the inlet manifold.

    the reason i ask this is because i have gone through the design process (and i say just the design process, never built) for a mid mounted plenum which turned out quite similar to what you are proposing to do. The biggest issue to overcome for me was how to bolt it down to the inlet manifold.
    if i used a flat plate on the bottom i could not see how i could bolt it down without having some sort of removable lid on the top of the plenum to access the bolts to bolt it to the inlet manifold, or if i made it as a fully enclosed top and flat plate on the bottom for strength, i would have to make a small stand off under the flat plate and effectively extend the runners out the bottom of the flat plate and fit a flange on the end of the runners so it can be bolted to the inlet manifold form the outside of the assembly.

    but that was just me and my design thoughts, just thought should share.

    the other option i have seen made a vr4 engine is a kind of flat oval doughnut shape (jam filled, not ring) that was bolted through the top, right through the full depth of the plenum. but i didn't like that idea just because it limited the height/volume of the plenum.

    Bye for Now!

  2. #22
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    Dave,

    If you actually look at the design he has a spacer that will sit on the factory lower half sits with the lower plenum plate on top of that. That will bolt to the lower plenum with the factory holes.

    From there he has the shell which will be removable on the top of that(think the two will be bolted together). This will allow it to be removable if required.

  3. #23
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    As jeremy said the shell will bolt onto the base. See my ozvr4 thread for more detail

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    Quote Originally Posted by Adam.Findlay View Post
    As jeremy said the shell will bolt onto the base. See my ozvr4 thread for more detail
    Oh I see, I was looking at the pictures posted up I this thread and there was not option for bolting the top formed piece to the lower oval plate.
    Glad you have considered this.
    I will take a look at your ozvr4 thread to see how you have done it.

  6. #26
    Adam.Findlay's Avatar

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    Quote Originally Posted by Colin Wiltshire View Post
    I'd be happy to send a donation to help this
    Ill see how the first one turns out. if its not too laborious I will replicate a few more to sell.
    I have already done the CAD drawings and sorted out laser and waterjet cutting. the main time consuming factor is pressing the plenum shells out then the hours and hours trimming and shaping them to fit the bases as the plenum shell die is originally for a 4cyl engine so its too long.
    Also If I were to make some to sell Id do them with a stock 68mm (FL Auto) throttle body flange so people can retain the stock TB as it his the Idle control stepper built in.


    Quote Originally Posted by Davezj View Post
    Oh I see, I was looking at the pictures posted up I this thread and there was not option for bolting the top formed piece to the lower oval plate.
    Glad you have considered this.
    I will take a look at your ozvr4 thread to see how you have done it.
    yeah images posted here were not the final design. basicly is what you see here with a 20mm wide flange lip around the edge for bolt holes to secure the shell to the base

  7. #27
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    6A13TT Intake plenum, aftermarket?

    That will probably work with some sort of gasket, I can recommend silicone bakeware for the initial prototype, it works well especially 20mm wide. You should be able to find a baking sheet which is big enough for about £5 and cut to size.

    Are you thinking of welding a thicker flange on the bottom of the shell or attempting to make a fold in the edge of the shell.

    If you go with a thicker flange it would be possible to make it a be more robust so it stay flatter to make the air tight seal easier when bolting it up, but it would mean a lot of welding and waste material from the cutting of the flange, especially if the flange is say 5mm thick.

    Look forward to seeing how you do it. There so many different ways of doing it.
    Last edited by Davezj; 21-10-2015 at 03:17 PM.

  8. #28
    Adam.Findlay's Avatar

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    Few Progress shots of what Ive been up to with my intake manifold.
    a fair bit of machine work gone into it so far. still a while to go. for those intrested in following it more my build thread on OZVR4 has much more detail

    20170309_101536.jpg20170317_153407.jpg20170318_100446.jpg20170319_131450.jpg20170319_141424.jpg20170319_141431.jpg20170319_141610.jpg20170319_170431.jpg20170319_170435.jpg20170319_170447.jpg20170319_170452.jpg20170319_183636.jpg20170319_183710.jpg20170319_183844.jpg20170319_183854.jpg

  9. #29

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    Probably gold will ... very time consuming work

  10. #30

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    Coil ignition coils from Colt are very nice fit, and they are not so big

  11. #31
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    these are an aftermarket coil which I again have made custom alloy brackets for. much better than stock colt coils.

  12. #32
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    Considering vr4 cylinder capacity and max potential boost running in application... Colt coilpacks are more than sufficient for COP setup.
    Ex: Galant VR4
    Running 268 HP ATW and 443 Nm torque at 0.9 bar
    Now: Lancer Evolution 8 FQ-300
    Running 325 HP ATW and 510 Nm torque at 1.6 bar

  13. #33
    Adam.Findlay's Avatar

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    for a stock engine maybe yes. but my engine is pretty far from stock. stock colt coils definatly will not suffice in my situation. regardless, coils is a topic for another thread

  14. #34
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