A tuned manifold is normally one that provides the maximum
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pressure at the inlet valves under full load over a limited speed/ load range corresponding to maximumtorque speed or the maximum-power speed whichever is considered the most beneficial. without undue penalties at other speeds and loads. In a particular case an increase in torque and power of 10/15 per cent is obtainable by tuning the manifold which is complicated by the need (in some cases) to provide directional filling of the cylinders to aid swirl in the combustion chamber.
aWe have a surplus Bedford TK tractor
to which we propose to fit a Hiab crane. The vehicle would have its trailer coupling removed and would travel on the highway purely as a mobile crane. As a mobile crane, will this vehicle be exempt from testing under the plating regulations?