[Christ]

One way to make a multi fuel engine would utilize multiple cam profiles to effectively lower the dynamic compression characteristics of the engine in use. Example: an engine which is built with a simple CR of 14:1, with the gasoline cam profile being one which limits air intake such that the cylinder is not completely filled, similar to an "atkins"cam. The resultant smaller air/fuel charge will not detonate as readily due to compression.

Alternatively, the second, or E85 profile would be that of a standard camshaft, designed for a high compression, E85 only application.

With regard to fueling, the most compatible system would include two sets of injectors, each with an independent fuel system, the only common structures being electronics and intake manifold.