they are well within the capabilities of persons skilled in this art once the principles of this invention are understood suffice it to say that if liquid engine coolant or other liquid medium is used to transfer heat such a circulating circuit would comprise one conduit to send the liquid another conduit to return the liquid a pump various valves and valve controls that could be either manual or automatically operated by electricity vacuum or air pressure also the heat storage sink 150 can be used to store heat for later use in warming a start up engine or a cold passenger compartment or the stored heat might also be used to help maintain an elevated temperature in the catalytic converter itself over more extended periods of time it can be for example a heat storage device such as that described in the article entitled 34 latent heat storage 34 published in the february 1992 issue of automotive engineering vol 100 no 2 pp 58 61 heat pipes while not specifically shown in the drawings could also be used in place of a heat transfer fluid to transfer heat to and from the catalytic converter referring now to fig5 the catalytic converter 140 according to.