08-03-2023, 05:47 AM
Apologies if the answer to this query has already been provided in an earlier forum post.
I run my Ruby, which has the standard high compression head, on 95 octane unleaded and ethanol-free petrol. 91 Octane is also available, but I have been using the 95 octane in the belief that it should give me a little more power.
Recently another Austin 7 driver said that for the low compressions encountered in Austin 7's, it could be better to use 91 octane and that this might give better performance.
Does anyone have a technical explanation to confirm this or a well-documented trial?
I run my Ruby, which has the standard high compression head, on 95 octane unleaded and ethanol-free petrol. 91 Octane is also available, but I have been using the 95 octane in the belief that it should give me a little more power.
Recently another Austin 7 driver said that for the low compressions encountered in Austin 7's, it could be better to use 91 octane and that this might give better performance.
Does anyone have a technical explanation to confirm this or a well-documented trial?