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These things actually do achieve darn near "hydraulic lock" at TDC on the compression stroke. While static compression is very low (I believe around 6.5:1), the supercharger and fuel delivery make up for that. The stoichiometric ratio for the fuel mix they run (90% nitromethane, 10% methanol) is around 2.1:1, so even before it gets fed into the cylinders at 4.5 bar (65 psi) it's darn near liquid rather than vapor.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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