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8 degrees BTDC and modern fuel?


David McHugh
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Optimum facfory settings were based on using 100+ ron fuels

if you use the widely available 97+ you can get close to the book settings if she pinks retard a little till it stops

 

if you try to run on 95ron that was used in the days of triumph for side valves and lawn mowers

you dad would not have put 2**Regent in his spitfire but would have some for the mower

if you use low grade unleaded retard much further to stop pinking and suffer the corresponding loss of power sooty plugs and worse fuel consumption

pete

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