Agree with the turbulance part. That's one of the greatest challenges in designing engines. As compression increases, laminar flow increases and the fuel mixutre gets pushed to the sides of the cylinder, reducing the effectiveness of the combustion (so one of my professors told me). The increase in laminar flow and the "de-centralization" of the liquid is an exponential function, meaning that at typical engine pressure (10 atm I believe) laminar flow is very high. The only way to overcome this is by inducing a turbulant air flow inside the cylinder.
Cool bit about the shift reactor. How much hydrogen can it pump out (per pound of coal perhaps)? Last time I checked, we have plenty of coal here in the U.S.
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