Cheap to Run

[V8Landy]

Does anyone think this is true about the octane.:confused: I know what i think:eek:

Land Rover Discovery 93 Big V8 one of a kind NO RESERVE - eBay, Passenger Vehicles, Cars, Cars, Bikes, Boats. (end time 29-Nov-09 20:15:39 AEDST) (http://cgi.ebay.com.au/Land-Rover-Discovery-93-Big-V8-one-of-a-kind-NO-RESERVE_W0QQitemZ180435836401QQcmdZViewItemQQptZAU _Cars?hash=item2a02d05df1)

[Bushie]

Gas-fueled engine

In engines running exclusively on LPG (http://en.wikipedia.org/wiki/Autogas) or CNG (http://en.wikipedia.org/wiki/Compressed_natural_gas), the Compression Ratio may be higher, due to the higher octane rating of these fuels.
Compression ratio - Wikipedia, the free encyclopedia

(http://en.wikipedia.org/wiki/Compression_ratio)but at 4:1 compression I'm surprised it runs at all :):)


Martyn

[GuyG]

4.4 crate motor running 4:1 compression - um doesn't sound quite right to me

[V8Ian]

Tell him he's dreaming;)

[DeeJay]

From memory LPG is 105 Octane rating, so he is quite correct, however that is only a quarter of the story as its the energy content that is relevant & LPG is almost half the weight of Diesel/ Petrol per litre- looking at Wikpedia tells the story.

LPG has a typical specific calorific value of 46.1 MJ/kg compared with 42.5 MJ/kg for diesel and 43.5 MJ/kg for premium grade petrol (gasoline). However, its energy density per volume unit of 26 MJ/l is lower than either that of petrol or diesel.

Gasoline contains about 32.0 mj/L (9.67 kWh/L,

When burnt, diesel typically releases about 38.6 MJ/l (138,700 BTU/US gal), whereas gasoline releases 34.9 MJ/l (125,000 BTU/US gal), 10% less by energy density, but 45.41 MJ/kg and 48.47 MJ/kg, 6.7% more by specific energy.



So, the energy values are LPG is 26, Diesel 38.6 and petrol either 32 or 34.9 Mj/Litre

[loanrangie]

Considering the leyland 4.4 hasnt been produced for about 35 years there is no way he has a new "crate" motor as advertised, i'm guessing its a typo as 14:1 is common for a straight lpg motor.