Subject	Quick Tech: Effective Compression, for beginners.
Posted by	ni[X]it on July 14, 2007 at 6:37 PM
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Message	Effective compression is the sum of the static compression, plus the additional compression added to the cylinder by a turbo or super charger, or any other forced induction tool for that matter. Effective compression is defined by the following formula: E = C((B / 14.7) + 1) Where E= Effective Compression, B= boost psi, and C= Static compression. Also remember that 14.7 is equal to 1 bar of boost. Variables such as turbos, intercoolers, air temperatures, and elevations all play with these numbers, but as a general guideline, the above and below are accurate for street cars. Highlighted areas indicate safe limits for most Z32s. Petz #3
Follow Ups	Quick Tech: Effective Compression, for beginners. - ni[X]it 18:37:35 07/14/07 nice! (n/m) - spotz 18:46:49 07/14/07 Nice, but I think 1 bar = 14.503 psi at 0 elevation. - turtleboy 18:48:12 07/14/07 Well, I used 14.50377 - ni[X]it 18:51:20 07/14/07 Oh, it looks like you have 14.7 in your original post though - turtleboy 18:55:58 07/14/07 Given the significant digits when measuring engine variables - Kenny 18:57:54 07/14/07 Well technically the sig figs would be: - turtleboy 20:23:47 07/14/07 Right, so given 2 significant digits, it's correct. (n/m) - Kenny 23:34:04 07/14/07 2 Sig figs = 15.. but eh, who cares, I just interpreted his - turtleboy 23:36:04 07/14/07 That's what I said. (n/m) - Kenny 23:53:24 07/14/07 the 14.7 is atmospheric (Barometric). Not the same as BAR. - ni[X]it 18:59:07 07/14/07 Ah gotcha.. Nice work. (n/m) - turtleboy 20:21:39 07/14/07 PS, as an engineer, we use this one; - ni[X]it 18:56:46 07/14/07 Thanks :) (n/m) - turtleboy 20:24:17 07/14/07 thats badass, thanks (n/m) - dpjax 08:36:03 07/15/07 Sweet. (n/m) - Kenny 18:50:52 07/14/07 Neat - pacmanpth 19:08:45 07/14/07 Nice! - ZCulture 19:31:08 07/14/07 right click save as (n/m) - Tikigod (Denver) 19:56:08 07/14/07 obviously its a bit outside the scope of this chart... - AntiHero 21:31:00 07/14/07 Quite useful. Thanks! (n/m) - 91z tt 22:29:26 07/14/07 Thanks Nick. Maybe this will get moved to tech for VTF. (n/m) - Dave N 23:06:15 07/14/07
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