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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,566
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On Super 91 octane 9.5:1 CR is as far as I push it on single plug. My logic on running the 91 is availability and it's pure gas. The 93 and 94 here the octane is 'boosted' by adding ethanol which I don't want because I run webers, plus it's only available at select stations.
What I'm getting at is pick the gas that's most readily available in the UK (and maybe EU), pure gas if available and do the maths and CR for that octane. At a certain CR you have to pull the trigger and twin plug, even on high test. Of course that advice is for a street car as I drive my twin plug 3.0 almost daily during the summer.
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'74 Porsche 914, 3.0/6
'72 Porsche 914, 1.7, wife's summer DD
'67 Bug, 2600cc T4,'67 Bus, 2.0 T1
Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend.
Last edited by Mark Henry; 02-03-2022 at 05:48 AM..
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