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Phenolic spacer

basil brush Feb 21, 2018

  1. basil brush

    basil brush Active Member

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    hi , I’m almost ready to fit my 034 phenolic inlet spacer !
    What have people done re the engine cover bolt brackets ?
    I want to keep the engine cover for OEM looks but I’m guessing moving the inlet out from the head also moves the engine cover bolt holes ?
    What’s the soloution please ?
    Basil :)
     
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  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Its been a while and I haven't got time atm to look but pretty sure I just fitted it and it didn't move enough to worry about as it moves up more than it moves away from the head..

    I may have slotted the holes on the fixings too but don't recal...

    Either way... I ran a phenolic and covers... you know this!! ;)

    <tuffty/>
     
    basil brush and SHUk like this.
  4. SHUk

    SHUk Once Bitten Forever Smitten =]

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    I doubled up the OEM gaskets
     
  5. vanilla_ice

    vanilla_ice Active Member

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    Does it reduce IAT's? Any issues?
     
  6. Stuart B

    Stuart B Well-Known Member

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    It would be interesting to know whether the phelonic spacer actually increases the size of the throttle body?
     
  7. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    say what?....

    A phenolic spacer is a heat insulator... limits heat exchange between the head and the inlet manifold

    <tuffty/>
     
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  8. Stuart B

    Stuart B Well-Known Member

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    I know what it is, but does this extra 1cm for each of the intake tubes make any difference to the total volume of the throttle body, or is the volume of the throttle body only calculated in the main section, as the gasket is after the injectors?
     
  9. superkarl

    superkarl MAN OF STEEL

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    It has nothing to do with the throttle body
     
  10. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    By throttle body I assume you mean plenum...

    Its irrelevant as air is already been metered by the MAF

    <tuffty/>
     
  11. Stuart B

    Stuart B Well-Known Member

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    (Sorry, I know this has digressed from the original spacer thread title)

    Okay thanks Karl and Tuffty, so the throttle body (plenum) actual size is calculated excluding the runners? I'm still unsure of the benefits of a larger throttle body unless the runners are wider as the air still has to be delivered through the rest of the circuit? Or are larger throttle bodies generally only fitted if you change to a large port head? Or is it more to do with vortex and atomisation for improved response? This is a bit beyond my basic knowledge - but still interesting.
     
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  13. Rainbird

    Rainbird Well-Known Member

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    Throttle body:

    [​IMG]

    Plenum:
    [​IMG]

    Realistically the difference in increased volume due to a phenolic spacer is negligible, don't overthink it :icon thumright:
     
    badger5, superkarl and Stuart B like this.
  14. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    inlet tract volume post MAF is irrelevant in context of fuelling calculations... for the volume of the inlet tract to 'fill' air still passes by the MAF and is measured by the MAF... adding 10mm to the runner length will not affect it as the air in the inlet tract system has already been measured to fill available space be it a small std plenum or a larger aftermarket one..

    Larger plenums aid better air distribution in general... longer runners aid better torque as a rule but on turbo engines especially on boost the effect is largely subjective

    <tuffty/>
     
  15. vanilla_ice

    vanilla_ice Active Member

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    Is there enough thread for the outer 2 nuts with a 10mm spacers plus 2 OEM gaskets?
     
  16. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Yarp

    <tuffty/>
     
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  17. vanilla_ice

    vanilla_ice Active Member

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    Some kits seem to come with bolts for the outer 2 threads. Are the outer threads removable? Are they studs? If so, left handed threads?
     
  18. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    they are studs, std threads...

    <tuffty/>
     
  19. vanilla_ice

    vanilla_ice Active Member

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    Thank you <tuffty/>
     

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