  The autoignition delays of mixtures of methyl-cyclohexane (MCH), oxygen,
nitrogen, and argon have been studied in a heated rapid compression machine
under the conditions $P_C$ = 50 bar, $T_C$ = 690 - 910K. Three different
mixture compositions were studied, with equivalence ratios ranging from $\phi$
= 0.5 - 1.5. The trends of the ignition delay measured at 50 bar were similar
to the trends measured in earlier experiments at $P_C$ = 15.1 and 25.5 bar. The
experimentally measured ignition delays were compared to a newly updated
chemical kinetic model for the combustion of MCH. The model has been updated to
include newly calculated reaction rates for much of the low-temperature
chemistry. The agreement between the experiments and the model was
substantially improved compared to a previous version of the model.
Nevertheless, despite the encouraging improvements, work continues on further
advances, e.g. in improving predictions of the first stage ignition delays.
