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Homogeneous gas phase kinetic experiments at high pressures and intermediate temperatures are critical for furthering an understanding of the autoignition chemistry of spark ignition engine fuels. In order to perform such experiments, a new variable pressure flow reactor has been developed. This device can be used to study homogeneous gas phase chemical kinetics over the pressure range from 1 to 28 atmospheres and the temperature range from 700 to 1300 K. Initial validation experiments were performed at pressures from 1 to 9 atmospheres using stoichiometric hydrogen and oxygen mixtures. Post-induction chemical kinetic results compare favorably with earlier atmospheric pressure flow reactor data and with numerical results predicted using a recently published comprehensive kinetic CO/H2/O2 mechanism. Near stoichiometric n-butane and oxygen flow reactor experiments were performed at pressures of 3 atm to 8 atm and with initial temperatures from 708 K to 945 K.