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What are manifold insulators? What do they do? How do they work?

Discussion in 'Mace Engineering' started by MACE, Jun 14, 2018.

  1. MACE

    MACE Well-Known Member

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    One of the questions we quite frequently get asked are, What are manifold insulators? What do they do? How do they work?

    Here's a link that can provide a better understanding of real world benefits this modification can make on the dyno, down the strip and through day-to-day driving.

    http://www.autospeed.com/cms/article.html?&A=110474

    And, NO! Our insulators and spacers are not made from timber lol

    110474.jpg

     
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  2. commodore665

    commodore665 expat Saffa

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    The insulators do work, with a CAI the combination works better
     
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  3. MACE

    MACE Well-Known Member

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    Definitely a classic mod indeed :D

    Best Regards,
    Steve
     
  4. scaredyet

    scaredyet Member

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    Is it a good idea to change the spark plugs while the top is off? I have a VZ and got the 12mm also should I put in new coils even if mine are fine?
     
  5. MACE

    MACE Well-Known Member

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    It would depend on how many kilometres your car has done to on the current set of plugs be honest. If they have travelled over 80% of their service life, then it would be a good idea to replace them. The fact that the insulators are reusable though, you're not obligated to having to do the plugs at the same time as you install the insulator.

    If you have any more questions please don't hesitate to ask.

    Kindest Regards,
    Steve
     
  6. scaredyet

    scaredyet Member

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    Sweet. I might as well change them out while it's off
     
  7. MACE

    MACE Well-Known Member

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    The only other thing that I can suggest when you replace the spark plugs is to gap them accordingly.

    If you have any more questions please don't hesitate to ask.

    Kindest Regards,
    Steve
     
  8. Fu Manchu

    Fu Manchu Well-Known Member

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    Is there a reason the spacers are designed without the notches for factory gaskets?

    It concerns me using these with silicon sealers, that if ever silicon finds its way through and into the cats, it can do quite a bit of harm to them. I've recently read some Holden tech info on damage to cats from silicons.

    I have the spacers on two cars and enjoy the subtle improvements in the way the car feels.

    I have one manifold off and was thinking of drilling a notch to allow factory gaskets to be used instead of silicone sealant.
    A pity they don't come like that. It would be a better finish to the product when using factory designed gaskets.
     
  9. keith reed

    keith reed Active Member

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    Are they made for the vn v8?
     
  10. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    No, nothing like this to suit the 304 unfortunately.
     
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  11. Fu Manchu

    Fu Manchu Well-Known Member

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    I thought it may have been because the spacer wall might be too narrow but there is a part of it that is about the narrow width if the notch was made.
    Could a MACE rep clarify?
     
  12. MACE

    MACE Well-Known Member

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    Great question. This is because we designed the kits to be run without the factory gaskets. In saying this though, there is no reason why the dowels on the factory gaskets can't be trimmed to suit, as the bolts through the manifold insulator and gaskets, ultimately line everything up anyway.

    The silicone sealant that we supply is O2 and cat converter safe. Unless an obscene amount of silicone sealant was used, I don't see how there would be an issue, which is indicative by the fact we have never had an issue with these items with the silicone sealant we supply.

    Sadly not, but would be possible to make though.
    If you have any questions please don't hesitate to ask

    Kindest Regards,
    Steve
     
  13. Fu Manchu

    Fu Manchu Well-Known Member

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    Unfortunately, mechanics that have done work on the car, are not so caring as to what sealant they are using.
    This is actually the main reason why, I wanted to go with gaskets.

    Thanks for the response Steve. It's always good to get the story behind products rather than speculation from other sources.
     
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  14. MACE

    MACE Well-Known Member

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    No problems, as long as your mechanic knows whats the good way to go it would be fine. Please let us know if we can be of any other help.

    If you have any other questions, please do not hesitate to ask.

    Kind regards,
    Michael
     
  15. losh1971

    losh1971 Well-Known Member

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    Do you have these for the L27?
     
  16. losh1971

    losh1971 Well-Known Member

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    I see they are listed for the Buick. However how do you know which one fits the 94 VR Buick? Also how does the spacers affect the front and rear seals? If they raise the manifold wouldn't the stock F & R seals sit below the edge of the manifold? Will I need a gasket kit if I was to fit these because surely the F & R seals leak if they are reused?
     
  17. MACE

    MACE Well-Known Member

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    Unfortunately, we don't sell manifold insulator to suit VR Buick 3.8L.

    If you have any other questions, please do not hesitate to ask.

    Kind regards,
    Michael
     

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