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Home > A-Series EFI / Injection > plenum { prob spelled wrong but don.t care lol }

clbm4n

62 Posts
Member #: 11458
Advanced Member

Melbourne Australia ... not a convict

17th Dec, 2016 at 12:26:17pm

Howdy fellow mini'ers .....

I am building an inlet manifold for a 7 port head for general road use that will run { close to } port injection ... now the big question is ..........

A, inlet runner length ....... any clues for torque ?

B, volume of runners / plenum ? I have been told 2 x engine capacity so 1293 x = 2.586 cc or close to that.

1977 Leyland mini Sunshine -- moleseted -- Named " Ray" becoming a 7 port efi slowly
1971 Nota Fang 145 bhp 5 port fun @ 450 kg
1969 Austin 1800 ute, 1800S running gear, tip rat and hardware store runner

wil_h

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9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

18th Dec, 2016 at 10:16:33am

What head are you using? Assuming turbo?

I made my plenum about 2 x engine capacity, I never measured it, just looked about right. Anywhere around 2l is going to work I reckon.

My brother worked out the ideal inlet length for the rpm of the engine, but they were way too long, so I just made them as long as I sensibly could within the confines of the engine bay.

I have an injector in each port and a single TB on the inlet of the plenum.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

Home > A-Series EFI / Injection > plenum { prob spelled wrong but don.t care lol }
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