Adiabatic integral intake and exhaust conduit for internal combustion engine

Claim 1

In an integral intake and exhaust conduit for an internal combustion engine of the type having a main and auxiliary combustion chamber, which conduit contains an intake passage and an exhaust passage wherein a portion of said exhaust passage is integrally formed with a portion of said intake passage to define a partition therebetween, an improvement comprising: a shell disposed about said intake passage and said exhaust passage forming an air gap between said shell and said intake and exhaust passages, said shell having a first and second aperture therein, said first aperture communicating with said air gap to allow air flow therein and said second aperture communicating with said air gap to allow air flow therefrom whereby air is continually drawn into said air gap over said exhaust and intake passages and out said second aperture thereby maintaining said integral conduit in a controlled temperature state as heat is transferred from said exhaust passage to said intake passage, said first aperture being disposed within said shell below said exhaust passage and said second aperture being disposed within said shell above said intake passage and a conduit communicating said second aperture with the air intake of the internal combustion engine thereby accelerating the heating of the air entering said engine.