[xtian999]

The conversions I have seen work like SCUBA regulators. The difference b/w ambient and manifold pres is critical. I saw an ultra high performance lng powered drag boat that had a roots blown big block ford motor that was draw through style. The guy said he could run more boost/compression than a gas motor b/c of the higher octane, but the power was 20% lower b/c of the fuel's caloric value.

The old hot rod books had a volume on nitrous that told which fuels were best in combination. LNG likes everything. Methanol to cool the cylinders, nitrous oxide, H3O before or after combustion to pump up turbo exhaust volume, and tolulene/benzine/kerosene for grins.

You may consider a diesel motor as a base, since they have big displacements, higher compression, and usually come with turbo plumbing already. Thicker cylinder walls are good too b/c LNG burns hotter than gasoline and strips the lubrication from the rings and increases cylinder wear. Plus the diesels have robust bottom ends. Once you get it sorted out for lng, add nitrous to spin bigger turbos up.

Plus, you will be smog and perhaps hov lane exempt. No egr or cats, and you can fill up at your house. (no road tax)