Quote:
Originally Posted by Little Jo
The diesel story is very interesting. I was having a conversation a short while back with a couple of Club members regarding the Octane level in unleaded petrol that we can only purchase now, if I remeber correctly, they said the old leaded fuel we used to purchase used in our jeeps burned around 70 - 75 octane and since the introduction of unleaded fuel the lowest we can get is 90 octane, to bring this down to a resonably correct burning levels in your jeep it was suggested to add a cup of diesel to the fuel whenever you filled up the tank. Sounds fair to me.???
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Not really, sorry. The octane rating determines to what level an air-fuel mixture can be compressed before it spontaneously ignites. The low-compression jeep engine can therefore run on low octane fuel, but equally well on high octane fuel. You just pay more because the high octane fuel is more expensive. Modern high compression engines need high octane fuel, otherwise the engine will "knock", and this will damage the engine.
HTH,
Hanno