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Frederic

Special vs Super petrol in UAE

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I will personally make sure that you fillup with 91 this time. 😂

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Let's root for each other & watch each other grow.

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I am always at 91. Will show the color of the petrol as proof. Don't worry. 🤣

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As far as my knowledge goes old days they used lead in petrol to control the burn. Once it became lead free, octane replaced the lead. So octane is now controlling the rate the fuel burns at. More the octane figure more the control of the burn, lesser the octane figure easier the burn of fuel. Like @Javier M said in super cars you need higher octane figures to control the burn, however in smaller engines it might cause issues as fuel will remain unburnt. That's wht better performance from E85 because easier to burn. However to use Ethenol your car should have the proper setup which would use the E85 in a useful way.

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i was talking about oxygenated and leaded fuel vs the fuel out at the pump....

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14 hours ago, Rahimdad said:

As far as my knowledge goes old days they used lead in petrol to control the burn. Once it became lead free, octane replaced the lead. So octane is now controlling the rate the fuel burns at. More the octane figure more the control of the burn, lesser the octane figure easier the burn of fuel. Like @Javier M said in super cars you need higher octane figures to control the burn, however in smaller engines it might cause issues as fuel will remain unburnt. That's wht better performance from E85 because easier to burn. However to use Ethenol your car should have the proper setup which would use the E85 in a useful way.

Lead was also used in petrol to lubricate the valve seats. The soft lead stopped the valve hitting the seat so hard, thus minimising wear. This is why when we restore old cars and convert them from leaded to unleaded we use hardened valve seats

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