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oldcorollas
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Kita-Ku, Sapporo, Japan
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January 2003

Re: Mehanical engineers or other informed people - supercharger questions	Tue, 14 December 2004 13:47

no no.. the pressure is a secondary thing pressure is a measure of air NOT getting into the motor. if you have a turbo at 15psi, and an SC at 15psi, the same mass of air is getting into motor. if you blow 15psi air into an SC, it will move that mass of air toward the motor.. hmm, i didn't wanna do calcs but... say you have motor that consumes... 100L of air with no boost (1bar absolute).. (for arguments sake to make it easy for me ) then if you feed it 15psi air (ie 2 bar absolute), it now consumes 100L, but at double the pressure, so effectively 200L of air at 1atm. to do this, you need an SC that moves 200L of air (at 1bar) then when it encounters the motor eating 100L at 1bar, to accomdate the extra mass of air, the pressure goes up... (a shit explanation but ya know...) now you have a turbo feeding 1 bar boost to the SC (2 bar absolute). the SC will move 200L of air at 2 bar absolute toward the motor. ie 400L of air at 1 bar. this is going into motor that can only eat 100L of air, so the pressure will go to 4bar... hmm, does that sound right? turbo moves variable volume but constant pressure (at steady state) SC moves constant volume but variable pressure. hmm.. i think calc is correct, but it's nearly 1am Cya, Stewart EDIT: this also means that when there is no turbo, you will still have 1 bar boost, but when turbo comes on full, it shoots up to 4 bar... farrrrrrk... [Updated on: Tue, 14 December 2004 13:50] [Report message to a moderator]

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