He expects researchers to use the FEL pulses to probe what
happens during fuel
combustion, how biomolecules behave in gases, and how reactions proceed at solid - gas interfaces.
Hopefully not confusing the issue, I will tell you that the intake valve remains open for a short time
during the beginning of the compression cycle, as well as the exhaust valve opening before the piston gets to the bottom of the
combustion cycle, but specifics of why this
happens is probably best left for another writ.