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Originally Posted by Big Dave
CNG requires "driveway fuel" to warm up the cooling system to keep the NG regulator from freezing.
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It uses the coolant to keep gas regulator from freezing, and requires the coolant to be warmer than about -10°
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An optimized CNG vehcle would run 13:5 compression with lots of spark advance.
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My up! runs 11,5:1 , compared to the regular petrol-up!'s 10.5:1
Also means FE isn't too great on petrol
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E85 runs 95-102 octane, so it would be OK warm-up and purge fuel for a CNG car.
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Mine ran rough on hydrous hE15
Not going to try E85 - which it isn't rated for - unless I know it'd work.
Converting FFV to CNG was quite popular - with FFVs already having the more heat-resistant valves/seats required by CNG.