tompat3463
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| posted on 21/3/12 at 08:35 AM |
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BLADE TURBO PLENUM
Just a quick one.. does a turbo inlet plenum need to have internal trumpets ?? or can the plenum just attatch to the carbs trumpets ??
cheers Alan
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T66
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| posted on 21/3/12 at 08:42 AM |
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The plenum on my Rotrex blackbird is basically an alloy box which sits on the tb's.
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matt_gsxr
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| posted on 21/3/12 at 09:02 AM |
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I think you would ideally have smooth airflow into the ITB.
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ReMan
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| posted on 21/3/12 at 09:23 AM |
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I was only looking t this myself last night as I was wondering whether it would be possible (albeit modified and sealed) to use the orginal airbox as
a plenum?
I think that they should stay on, but that there proabably not that much differenc being under pressure
www.plusnine.co.uk
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tompat3463
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| posted on 21/3/12 at 09:37 AM |
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Is the fireblade airbox not just plastic tho ??
The idea of fabricating a plenum isn't bothering me I would just like to know the best design for it before I start chopping 
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ReMan
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| posted on 21/3/12 at 12:27 PM |
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quote:
Originally posted by tompat3463
Is the fireblade airbox not just plastic tho ??
The idea of fabricating a plenum isn't bothering me I would just like to know the best design for it before I start chopping
Yes it is plastic but it's quite a substantial moulding with a good seal around the edge.
I think that it would work with lashings of sikaflex around the seam at up to 10psi?
www.plusnine.co.uk
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mark chandler
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| posted on 21/3/12 at 04:36 PM |
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Mine is ally and split so I had to pin at 6psi !!!
I doubt the standard plastic one will hold together at 10psi, thats a lot of pressure  at 6psi I am pushing 200bhp which must be near the limit of
the gearbox.
I made trumpets for inside mine, do not know if it made any difference but the do slot into the front of the TB's. I welded into the plenum,
leaving 3/8" proud which slots into the TB's then glued in with silicon
[Edited on 21/3/12 by mark chandler]
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tompat3463
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| posted on 21/3/12 at 05:14 PM |
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I have read somewhere that trumpets inside the plenum make for a smoother boost delivery
On the same note a cylindrical plenum with entry at one end is also unsuitable as the first cylinder that the boost comes to gets all the brunt.
That's why u see conical plenums rather than straight tubes. I do like the idea of the plenum being the shape of the oem box but as mentioned
doubt that the abs would be up to the job !!
Al
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Lebowski
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| posted on 22/3/12 at 02:08 AM |
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Trumpets are better than no trumpets, and if you're designing from scratch you may as well incorporate them.
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