My kids and I were messing around making bottle rockets mixing vinegar and Baking soda.
Would there be any potential to inject two chemicals into a combustion chamber and let the reaction of the mixture move the piston up and down?
One thought was increased speed. Would mixing occur fast enough to create the desired reaction?
The other thought was mileage? How much chemical would be needed for a desirable trip?
Also, the waste left behind, is it env. safe? What other chemical may be viable?
On a positive side, I would think the weight of the motor could be reduced significantly.
Just a random thought, bash away!