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مکانیک::
راهگاه خروجی
Temperatures high enough for some homogeneous thermal oxidation can be obtained by spark retard (with some loss in efficiency) and insulation of the exhaust ports and manifold.
running lean of stoichiometric or with a pump that introduces air into the exhaust ports just downstream of the valve.
Venturi air addition into the exhaust port using the pressure pulsations generated by the exhaust process can also be used to add the required air.
Oxidation after passage through the exhaust port can be enhanced with a thermal reactor-an enlarged exhaust manifold that bolts directly onto the cylinder head.
Its function is to promote rapid mixing of the hot exhaust gases with any secondary air injected into the exhaust port (required with fuel-rich engine operation to produce a net oxidizing atmosphere), to remove nonuniformities in temperature and composition in the exhaust gases, and to retain the gases at a high enough
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