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Date: Fri, 7 Mar 2003 23:25:26 +0000
From: C Sutherland <>
Subject: Re: car cuts out if not revved

In article <BhF9a.435$>, agha see <> writes > >Saab, Svenska Aeroplan AktieBolaget is designer and constructor of some of >the finest jet fighters of the world. These machines are examples of high >tech engineering. Since 1948, the same level of engineering is found in the >Saab automobiles. >A Saab engine and/or car, although not neccesarily designed by Saab, is >re-designed to a high standard concerning safety, power output, fuel >efficiency and emissions. Hence every hose, every valve, every bolt has a >specific function in the fine tuned automotive piece of engineering every >Saab is. >The opening of the crankcase has a destructive effect on the pressures >generated in the engine and the fuel system. No correct air pressure, no >go... Absolutely correct. A 2kpa drop in the bypass pressure of the secondary relief valve in the main feed to the reheat unit will create a low level pulsatile feedback which causes oscillations of the control circuit of the primary turbine section. This results in an acute loss of thrust leading to activation of the seatbelt warning light and deployment of the ejector seat. This has been such a persistent problem in the Viggen IVa series that they are considering replacing the push-on soft rubber tubes with braided hoses and threaded connectors. Hope this helps. Chas --

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