> In Brazil tried to cool the fuel, and it gave (they said) improved efficiency. heheh ;o) A variation of that can work as long as you design the rest of your system around it. A colder charge of fuel/air is denser so you can fit more in the same space so that you get more energy available per cylinder firing. You have to cool not only the fuel but the air as well and make sure everything else is not affected adversely by this. Note that does not improve the efficiency per se but the available power from a given engine. Do it too well and you will get pinking (detonation) etc. RM -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body