High Octane Petrol in Carb’s Air Cooled Cars
Discussion
Bits and pieces written about this on the net but can’t seem to arrive at a definitive answer.
My ‘68 912 seems to react adversely to BP Ultimate - lumpy power delivery, flat spots etc... but runs nicely using Shell’s finest.
Should I even be using high octane fuel in a carb’d car?
Would love to hear other folks experiences.
My ‘68 912 seems to react adversely to BP Ultimate - lumpy power delivery, flat spots etc... but runs nicely using Shell’s finest.
Should I even be using high octane fuel in a carb’d car?
Would love to hear other folks experiences.
its more important to use low ethanol content fuel in our older cars especially if theyre only weekend cars.. ethanol reacts badly with rubber seals / hoses etc in the fuel system . Obviously fuel lines should be upgraded anyway to cope with this.
This is one of the reason people recomend the high octane fuel as generally it was low ethanol in comparison to the standard 95ron fuel. These days though even vpower has an ethanol content .
This is one of the reason people recomend the high octane fuel as generally it was low ethanol in comparison to the standard 95ron fuel. These days though even vpower has an ethanol content .
hot66 is right. Ethanol content (or rather the lack of it) is crucial for rubber hoses and gaskets not to dry out.
But this should not have any effect on how your car runs.
Whether your car has carburettors or is fuel injected hasn't anything to do with the octane rating.
What is relevant is the compression and the ignition timing.
My '67 Volvo 1800 S (with twin SU Carburettors) is tuned to only run on RON 98 or higher fuel.
On an other note: does your car have hardened valve seats fitted?
But this should not have any effect on how your car runs.
Whether your car has carburettors or is fuel injected hasn't anything to do with the octane rating.
What is relevant is the compression and the ignition timing.
My '67 Volvo 1800 S (with twin SU Carburettors) is tuned to only run on RON 98 or higher fuel.
On an other note: does your car have hardened valve seats fitted?
Edited by Filibuster on Monday 5th August 13:18
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