Woop new range rover owner - l322 content

ovalandrover said:

LPG has a higher octane rating than petrol.

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This is true but doesn't equate to burning hotter - the wrong fuel / air mixture will dictate that, it will if anything reduce the chances of detonation / pre-ignition.
The main issues of running LPG is generally valve seat recession, as Saint said, the Rover & BMW V8 have adequate valves to cope with this. Flash-lube can be added for peace of mind though.

ovalandrover said:

LPG has a higher octane rating than petrol.

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Really? so how does it reduce output by 12-15% then? i'm confused..

myfirstl322 said:

Really? so how does it reduce output by 12-15% then? i'm confused..

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It's a common misconception that if a fuel has a higher octane rating it will burn at a higher temp, when in fact it means it has a higher resistancy to self igniting so gives a more controlled burn. LPG is less calorific than petrol so the burn you do get is less 'dramatic' .

It's true LPG has a higher octane rating than gasoline (c. 110-112 RON I think), but at the same time it has a LOWER energy content, due to its lower density. Needs a higher CR (compression ratio) in LPG IIRC?