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Engine Knocking....
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18-11-2022, 07:15 PM
Virtually every A7 I have come across appears to run rich on the std carb, aside from wear and settings I believe this has something to do with the specific gravity of modern fuels being different to the pre-war offerings available when the jets were originally sized
Black Art Enthusiast
20-11-2022, 07:03 PM
Dennis my Ruby has always run rich.
I have tried fitting a washer under the needle valve to little effect I am wondering whether the jets could be bigger after 80 odd years ? The gasket you mention would lift and richen the mixture. PS Good luck with the engine rebuild ! 
20-11-2022, 09:09 PM
Tiger, I purchased a Zenith refurb kit for the carb and it included a new needle valve plus 3 aluminium washers of varying thickness to fit between the cover and valve. One was the same thickness as that fitted on my carb and the others were thicker. Perhaps I should fit the thickest and give it a try.
I am also still very interested to know what affect basically blanking off the slow running jet makes to the performance of the carb?? Any ideas anyone?? |
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