Time to dis-spell a few myths— As always Ralph is on the money.
There has been much talk of alternative fuels to keep our classics going as petrol becomes ever less attractive. But after all is said and done, more has been said than done.
Here is a brief summary of my experience and some hearsay from down the pub, it is quite possible I have made a mistake here or there so if you spot one do let me know.
Mostly Propane with a splash of Butane, stored as a liquid under a pressure of about 5 bar in steel cylinders. The fuel is turned into a gas and the pressure regulated in an evaporator that is heated by engine coolant. The simplest way of feeding the gas into the engine is by using a gas carburettor, but these are quite restrictive and so peak power is significantly reduced, maybe by 20%, although most drivers don’t notice this for some reason…
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