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Originally Posted by euromodder
I know, I know I should ...
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Consider thyself admonished!
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[*]CNG is stored as a gas despite the 200 bar / 2900 psi tank pressure - LPG is stored as a liquid.
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Hmm- thats some pressure-similar to a modern common rail diesel- guess it explains the tanks!
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[*]2-stage pressure reduction system, the 2nd stage using variable output pressure based on the engine's demand and is heated by the engine coolant.
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Similar to a vapourisor on an LPG setup? except with pressure control as well. sounds good- inso far as it is load reactive
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[*]large, voluminous cylindrical tanks for CNG rather than space-saving donut type tanks for LPG.
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How does that impact on the available space in the Up!? does it reside in the location usually reserved for the petrol tank?
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[*]VW have increased the compression and fitted hardened valves + seats, so no messing about with valve lube etc. like with LPG
(valve lubing is often needed on retrofitted CNG cars though)
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so similar to LPG in that its a drier fuel than petrol, and some cars can suffer valve seat recession due to using it? Jaguars need valve lube for LPG, but the BMWs I have are happy without it
Interesting re the compression! does CNG have a higher RON rating, but lower calorific value?
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[*]Monovalent car, so the driver can't select which fuel to use (which you can in LPG or CNG-retrofitted cars) - it runs on CNG until the tanks are empty.
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ah, so no handy "range extender" option then? I did like that about LPg
Cheers for the insight (ecomod punFTW!)