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Plenum spacers

Discussion in 'General' started by OCO0012, Nov 25, 2018.

  1. OCO0012

    OCO0012 New Member

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    does any one have any stats on the difference a plenum spacer makes to power economy and heat reduction? I got a 12mm spacer but I think did not put the gasket maker on properly, so there was a vacuum leak and freeway economy went from 10L per 100k too 5.5L per 100k.
     
  2. Commo Baba

    Commo Baba Active Member

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    I would think the makers (Mace?) has some info.

    Meanwhile your L/ 100KM say you're now getting almost double economy. Exceptional rate.
     
  3. OCO0012

    OCO0012 New Member

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    Last edited: Nov 26, 2018
  4. OCO0012

    OCO0012 New Member

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    I think I have a bad fuel pump I took the spacer out and it had the same economy.
     
  5. Commo Baba

    Commo Baba Active Member

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    How are you measuring the usage.?

    Sender unit is a known weak point and you will find threads on it.
     
  6. OCO0012

    OCO0012 New Member

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    Car instant fuel, trip metre and at the pump
     
  7. Fu Manchu

    Fu Manchu Well-Known Member

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    have these on both cars.
    Noticeable improvement in drivability. Much more enjoyable, so nice for the money.
    I haven't noticed any remarkable fuel savings.
    The manifold is definitely cool to the touch when you've been out driving. Once the engine is off, the heat soak still happens, and it can be hot to touch after 30 mins or so with the engine off.
     
  8. OCO0012

    OCO0012 New Member

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    Hi what size spacer do you have I have the 12mm? I have noticed the engine being cooler but takes a lot longer then yours to be touchable.



     
  9. Fu Manchu

    Fu Manchu Well-Known Member

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    I have both spacers in use.

    The VZ has the 24mm.
    The VE has the 12mm.
    I'd love to have the 24mm on the VE but there wasn't enough room to fit it with the engines sitting closer to the firewall than on the VZ.
     

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