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Home > Help Needed / General Tech Chat > Plenum

wolfie

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8149 Posts
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Somewhere around Swindon

Chaps

I need to design a new plenum, i know the parameters i am working within but need some advise on the inlets.

Basically is there a benefit to having some sort of trumpet in the plenum? i have done a bit of research but cannot decide if the inlet needs to be nicely radius'd or a lip machined into the back plate or a proper bell mouth.

Any advice would be appreciated.


Crystal Sound Audio said:

Why wolfie...you should have your name as Fuckfaceshithead !


"A common mistake that people make when trying to design something completely
foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams


Tom Fenton
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15277 Posts
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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TM legend.

Rotherham South Yorkshire

Flow bench testing is the only definitive way to know, but Iím sure full radius bellmouths are best if possible.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


adcyork

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York

The vizard book shows a large diameter short depth elliptical flare to flow best, see image


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Tom Fenton
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15277 Posts
Member #: 337
Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

I reckon the statement "anything with a radius over about 1/8" is in with a 99% chance of working" is a good one to employ here!


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


robert

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uranus

i think any of those picture would be fine Neil, i would not bother with a taper personally .just keep it simple ,with a nice lip.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

10mm flat plate witht he holes radiused with a router bit?

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Tom Fenton
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15277 Posts
Member #: 337
Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

Pass me a f***ing Stetson!


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


Graham T

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Member #: 1106
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Hungerford, Berks




On 23rd Jun, 2020 Joe C said:
10mm flat plate witht he holes radiused with a router bit?




It worked for my original X7 aluminium cobble together:





If you can get the router to stay flat/ level...

í77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675


wolfie

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8149 Posts
Member #: 90
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Somewhere around Swindon

On 23rd Jun, 2020 Joe C said:
10mm flat plate witht he holes radiused with a router bit?


I thought i might get some good looking chap to draw me up a cad file. i can then contact a machinist, get a quote and a time frame for him to break, get told he fucked it up and needed to be re machined, receive item and have to tell him he's still fucked it up and it needs redoing.. again.

Crystal Sound Audio said:

Why wolfie...you should have your name as Fuckfaceshithead !


"A common mistake that people make when trying to design something completely
foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams

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