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Anytime you think of incoming air temperature, just take it to the extremes. Say 50 below 0 and 180 above. I think either one would give you problems, but I am sure the 50 below will not help your efficiency. When fuel is injected the huge increase in surface area absorbs heat. The is one of the reasons why direct injection allows an engines compression to be increased significantly and still run on regular fuel, but DI with sequential squirts cam also be done while combustion is actually occurring, which in the case of the Mazda SKYACTIV engines just coming out, allows compression ratios as high as 14 to 1 running on gasoline with no possibility of pre ignition, since there is almost no fuel in the combustion chamber before TDC.
Transonic is working on fuel heated to several hundred degrees under pressures approaching 200 atmospheres (almost 3000 PSI). The idea is to have the fuel self ignite when injected with no spark necessary like a diesel (but gasoline).
Semi hijack, my apologies.
regards
Mech
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