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Date:         Mon, 14 Aug 2000 22:50:00 +1300
Reply-To:     Andrew Grebneff <andrew.grebneff@stonebow.otago.ac.nz>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Andrew Grebneff <andrew.grebneff@stonebow.otago.ac.nz>
Subject:      Supercharger (was: 5 cyl. Audi in Vanagon - was Engine
              Conversions)
Content-Type: text/plain; charset="us-ascii"

>Techincally, a turbo charger is exhaust driven, a super charger is >mechanically driven >Mark

No no no!!! Any form of increasing the inlet charge is a supercharger. Nitrous oxide is a chemical supercharger. There are various totally different types of belt-driven superchargers, and these can also be driven by shaft or geartrain (or even fluid coupling, though I've never heard of that last being used). Turbo, a contraction of "turbosupercharger", is merely an exhaust-driven supercharger. And don't forget that fluid drives and linkages (turbos, hydraulic brakes) ARE mechanical...fluid mechanics.

Maken no difference whether it's driven by belt, shaft, gear or fluid (either liquid or gas), whether it uses vanes, gears, scrolls or turbine, it's still a supercharger.

And HERE is where the adage of popular (mis-)usage defining the definition falls down. Technical (and even more figorously so, scientific) terms are static; use a technical term incorrectly and it's abuse.

Andrew Grebneff Dunedin, New Zealand VW & mollusc nut 1969 Kombi with Corvair 2.4 & Powerglide 1975 Kombi derelict ex 3.6 Toyota V8 1984 Caravelle 3.8 Holden V6 1984 Mitsubishi Galant Sigma 2.0 (FWD) 1986 CE80 Toyota Corolla 1.8DX diesel 1989 CT170 Toyota Corona Select 2.0 diesel


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