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Self Made Manifold Insulators

Discussion in 'V6 Development And Modification' started by Ryan Boyce, Aug 13, 2017.

  1. Ryan Boyce

    Ryan Boyce New Member

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    I was just about to buy Maces Plenum Spacer and Manifold Insulator. I've got a few other basic mods and upgrades for the near future so I got back in contact with some old friends in the race engine industry. One of his customers brought in an ecotec with a 12mm Plywood self made plenum spacer, straight away I thought oi.... that's a bit how ya going.... But he claimed to have put 70k kms on it since he made it and he had no problems. Now this starts sounding pretty dodgy at first but hear me out, apparently the ply works fine for a spacer but obviously ply isn't a good option for a Manifold Insulator, so what about layering some 6mm Fibre Cement then sealing the whole thing in hi-temp paint so it can't break down over time. I'm a carpenter, we drop fibro down on timber floors when we install fire places and with a fire cranking you can't feel heat in the timber under it after 3x layers (18mm) are down. There isn't a lot of detailed info about making your own spacers and insulators, I was hoping for a bit more than what I found.
     
  2. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    The spacers work by increasing intake runner length, not really by "insulating". That's where you get your performance increase from, not by keeping components cool.
     
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  3. munter000

    munter000 Member

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    I would have thought a cooler charge of air/petrol mix would help performance.
     
  4. _R_J_K_

    _R_J_K_ Well-Known Member

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    It does, but whether or not the spacers can overcome heat soak is kind of debatable.
     
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  5. Ryan Boyce

    Ryan Boyce New Member

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    Thanks anyway guys. I'll save the trouble and buy them. I've got full trust in Maces ones.
     
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  6. commodore665

    commodore665 expat Saffa

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    I've had 25mm ones on my VZ for a few years , as mentioned by , lengthening the runners you get more of an intake charge, the intake temperatures drop as well , you probably will not feel any difference in performance though .
     
  7. munter000

    munter000 Member

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    so is it a worthwhile mod? It seems a relatively easy thing to do.
     
  8. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    It's worthwhile as it lengthens the runners, this shifts the torque a bit lower in the revs giving you better acceleration.
     
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  9. munter000

    munter000 Member

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    Thanks, appreciate the reply.
     
  10. commodore665

    commodore665 expat Saffa

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    You could also get a CAI as well to help the car breath easier
     
  11. EYY

    EYY Well-Known Member

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    High ratio rockers are the only mod I'd bother with on a v6 apart from diff gears. If you really want a faster car and if you're likely to want to continue modding, buy a v8 - it'll end up being the more economically viable option in the long run.
     
  12. commodore665

    commodore665 expat Saffa

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    as the OP has a VZ , high ratio rockers are not available for those , and in any case high ratio rockers don't do a lot anyway, I had them on my VX , and there was not a lot of difference to be honest .
     
  13. KustomKulture62

    KustomKulture62 Active Member

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    The spacers work by increasing intake runner length, not really by "insulating". That's where you get your performance increase from, not by keeping components cool.

    performance increase? how many extra HP for the old V6.
     
  14. ozNick

    ozNick Member

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    In my case (VZ v6) the torque curve came in at lower revs, but not sure if there was any power increase.
     
  15. EYY

    EYY Well-Known Member

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    Ah, didn't realise it was for a vz, OP didn't mention which engine.

    Don't underestimate the difference lower IAT's can make! But generally a longer runner is better for airspeed and helps throttle response, but at the expense of upper rpm torque.
     
  16. Ryan Boyce

    Ryan Boyce New Member

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    Sorry I never mentioned mines a VX. I was under the impression that all the ecotec engines were the same.
     
  17. Tsunamix

    Tsunamix Active Member

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    In the L36, there is no oil splash plate under the LIM, so the LIM runs hotter than in alot of other cars. So the insulating properties of the SPacer can and do help - for a bit. No matter what you do, the UIM will absorb heat from the hot air at the engine top, and will probably run at temps close to the LIM anyway.

    Run more air through this space, using NACA ducts or something and you would see more benefit.

    I've made my own spacers, including PCV delete, hogged them out to match oversize inlet runners. Works well - if theres plenty of top end cooling - which is one reason I use water meth injection - keeps the UIM about 30 degrees under LIM during WOT
     
  18. VT&VX

    VT&VX Active Member

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    Why bother?
     

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