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Auto-ignition of gasoline occurs at 280C/536F. <http://www.engineeringtoolbox.com/fuels-ignition-temperatures-d_171.html>
The starter motor and batteries for an engine with a 100:1 compression ratio would be HUGE.
A top fuel dragster/funny car engine estimated H.P. is somewhere above 8000. The stresses on pistons, connecting rods, crankshaft, bearings, cylinder walls limit the life of the engine at wide open throttle to no more than 5-6 seconds.
IMHO a gasoline engine with 100:1 compression ratio would last somewhere between a few minutes and one hour if you could get it started.
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