that's very interesting Huw, I found this that says the stoichiometric ratio for e10 is 14.08:1, so anyone running 14.7 is a little lean.Also from the Federation of British Historic Vehicle Clubs:
Ethanol contains approximately 35% oxygen by weight and will therefore result in fuel mixture enleanment when blended into petrol. Petrol containing 10% ethanol for example, would result in a mixture-leaning effect equivalent to approximately 2.6%, which may be felt as a power loss, driveability issues (hesitations, flat spots, stalling), but also could contribute to slightly hotter running.
that's very interesting Huw, I found this that says the stoichiometric ratio for e10 is 14.08:1, so anyone running 14.7 is a little lean.
https://www.aa1car.com/library/air_fuel_ratios.htm
Forgive me if I'm wrong but if your car isn't designed to run on 97/98 fuel then until now there was no benefit to paying the extra? I doubt that they frequently had access to high octane fuel in the 70s and the manual doesn't seem to state its required.It Baffles me why anyone would use cheap 95 in there classic in the first place?
Simply use the better quality Super unleaded.
It Baffles me why anyone would use cheap 95 in there classic in the first place?
Simply use the better quality Super unleaded.
Octane requirement in the manual should be seen as a minimum requirement to ensure the correct operation of the engine.Forgive me if I'm wrong but if your car isn't designed to run on 97/98 fuel then until now there was no benefit to paying the extra? I doubt that they frequently had access to high octane fuel in the 70s and the manual doesn't seem to state its required.
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Still pretty sure you need to adjust fueling to benefit from higher octane unless the car is designed for it.
I'm sure we also had 5 star fuel in the 70s, as well as 2 and 4 star.
Still pretty sure you need to adjust fueling to benefit from higher octane unless the car is designed for it.