Abstract: The invention relates to super-charged combustion engines in which a compressor is arranged in the engine inlet system and driven by a turbine in the engine exhaust system, a duct is provided for by-passing the turbine to the exhaust outlet, and a valve is provided to control exhaust gas flow through the by-pass duct and turbine. The invention provides exhaust gas pressure transmitting means connected to actuating means incorporated in the valve, said actuating means operating in dependence upon the pressure of the exhaust gas to control its flow through the turbine and the by-pass duct in order to limit the speed of the turbine and the compressor when a predetermined pressure is exceeded, whereby pressure in the engine inlet system decreases with increasing engine speed, at least within an upper r.p.m. range of the engine.

Abstract: Arrangement with a combustion engine having a fuel dosing carburetor, a throttle and a compressor situated in the engine inlet system. The carburetor is positioned upstream of the compressor and the throttle is positioned downstream of the compressor.