Re: [alfa] Plenum volume (NAC)

[webb.p@xxxxxxxxxxx]

That's called a Helmholtz resonance chamber.   It should be 2 times the engine 
displacement.   It's tied closely with runner length and shape.   

There is some decent information on the net about it, but I hope your math 
skills are polished.  I'm just starting to get my head around the principle.

See http://www.rsparks.com/intake_tech/Lecture08.ppt for a summary of the 
engineering.

-Peter

>      I remember reading somewhere that the ratio between an engine's intake 
> plenum volume and total displacement should be 1:1 or 1:2. Does anyone 
> happen to know what the optimal ratio is or what effect changing the plenum 
> volume has (ie. will a smaller plenum improve throttle response)?
> 
> thanks in advance,
> -Obie
> Tacoma, Wa
> assorted alfas
> 
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