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Thread: tips for turbo manifold design

  1. #1
    Junior Member Domestic Engineer myne's Avatar
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    Default tips for turbo manifold design

    Ok, so I picked up a t25 for 100$, and some plasticine, now I'm attempting to prototype a fairly decent 4age manifold before I get my mechanic mate make it for real.


    http://www.users.on.net/~jvizard/myne/Manifold/left.jpg
    http://www.users.on.net/~jvizard/myn...fold/right.jpg
    http://www.users.on.net/~jvizard/myne/Manifold/side.jpg
    http://www.users.on.net/~jvizard/myn.../top-ports.jpg

    They say with extractors to get the runners as close to the same length as possible, and they say for 4-1 extractors to make the runners enter in the order of firing.
    I've attempted to do this as much as possible.
    The runners are ~32cm long, and while I havent had a chance to comapre the manifold next to the engine I think it looks promising.
    I'm contemplating twisting it up more to get the turbo higher, and possibly shortening the runners.

    Thoughts appreciated.

  2. #2
    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: tips for turbo manifold design

    Nice work not sure how it will go with heat though!! plasticine might melt.

    On a serious note it looks good but i think the turbo will sit too low!
    If you want to keep runners same length bring the manifold up higher first the bend it down like mine on my avatar!

  3. #3
    is the bestest Conversion King LeeRoy's Avatar
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    Default Re: tips for turbo manifold design

    +rep for innovation, thats a pretty good idea to get some sort of idea on how to knock a manifold up and get lengths and sizes right. Gumby would be proud
    - LeeRoy
    Daily Driver: Red Ae93 Project: My TA22 - now with 3s-gte
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  4. #4
    i wrote the Automotive Encyclopaedia roadsailing's Avatar
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    Default Re: tips for turbo manifold design

    thats a good idea using plasticine, but will be somewhat diffiicult to transfer the angles to standard elbows.

    here are some tips:

    keep the pipes as short as you can without sharp bends

    make sure you have good access to all bolts and studs

    make sure it can be put together, i think its a good idea to start with the collector and work your way to the primarys.

    have the pipes enter the turbo circularly in firing order (probably not so critical but your design does this)

    make sure the turbo sits level, it looks like it has a major angle in your pics but the plasticine might have just melted.

    on your design, i;d just join all the primarys where the fingernail mark on primary 1 is.
    like to drift? live in victoria?
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    formerly shinybluesteel

  5. #5
    broken down ex guru Chief Engine Builder feral4mr2's Avatar
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    Default Re: tips for turbo manifold design

    gnarly looking manifold you have there. good stuff.

    they dont 'have' to be of equal lengths. the ol log style manifold works well. IMO turbo manifold design is somewhat different to na extractors.

  6. #6
    Oh What a Feeling! Backyard Mechanic c2888's Avatar
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    Default Re: tips for turbo manifold design

    I like your cutting tool!
    Good thing computer cases are so bloody sharp.
    The spanner in my avatar is actually a 16mm, that's why it's still new

  7. #7
    Junior Member Domestic Engineer myne's Avatar
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    Default Re: tips for turbo manifold design

    My cut finger can attest to that.

  8. #8
    Junior Member Grease Monkey FATMR2's Avatar
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    Default Re: tips for turbo manifold design

    Here is a pic of the one i made for my 4agte. I tried to keep all the runners the same length. It worked quite well so i was happy.







    Oh, i just looked at the rest of those pics you have......If you sit the turbo that low you will have problems with the oil return line to the sump. The way mine sat was a little on the low side as it was but there's not much you can do in an aw11.

  9. #9
    i wrote the Automotive Encyclopaedia roadsailing's Avatar
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    Default Re: tips for turbo manifold design

    for all the noobs,

    EDIT: this is a bigger picture of the manifold shown above - thumnail link didnt seem to work



    thats a nice looking manifold fatmr2
    Last edited by roadsailing; 23-04-2006 at 02:25 PM.
    like to drift? live in victoria?
    www.vicdrift.com

    now targeting: targets

    formerly shinybluesteel

  10. #10
    Junior Member Grease Monkey FATMR2's Avatar
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    Default Re: tips for turbo manifold design

    Thats my manifold......

  11. #11
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: tips for turbo manifold design

    it's pretty
    "I'm a Teaspoon, not a mechanic"
    "There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)

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  12. #12
    Junior Member Domestic Engineer BigWorm's Avatar
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    Default Re: tips for turbo manifold design

    One thing I'll mention, don't be afraid to make the runner diameters even smaller than the exhaust ports. It may look weird, but seems to work quite well in practice.

  13. #13
    Junior Member Domestic Engineer myne's Avatar
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    Default Re: tips for turbo manifold design

    Attempt #2
    Looks neater, is about 10cm shorter per runner but I think it'll fould bigtime on the oil filter.

    I'll check it out tomorrow, and most likely try again, but move it over to the right a bit more.
    Also thinking of ditching the 'collector' you can see.

    I was originally thinking it might work as a FWD or RWD manifold but it's apparent that it's impossible to make a decent manifold that will do either.



    http://www.users.on.net/~jvizard/myn...fold/2-top.jpg
    http://www.users.on.net/~jvizard/myn...old/2-left.jpg
    http://www.users.on.net/~jvizard/myn...ld/2-right.jpg
    Last edited by myne; 23-04-2006 at 08:25 PM.

  14. #14
    i wrote the Automotive Encyclopaedia roadsailing's Avatar
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    Default Re: tips for turbo manifold design

    turbos on backwards
    like to drift? live in victoria?
    www.vicdrift.com

    now targeting: targets

    formerly shinybluesteel

  15. #15
    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: tips for turbo manifold design

    and gasket is around wrong way!

    but your getting closer!

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