Bristol Cars - Owners and Enthusiasts Forum - Bristol engine Rocker arm ratio

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412usa

16-11-17 08:02 PM

Bristol engine Rocker arm ratio

Has anyone ever calculated the Rocker arm ratio on the Bristol engine. I am specifically talking about the BS1MkII but I don't think there are any basic differences in the architecture of the Bristol engines.

Geoff Dowdle

17-11-17 12:16 PM

412usa,
The rocker ratio is 1.5 to 1.0 .
So for example the cam lobe lift is .200 inch , the valve lift will be .300 less the valve clearance .

Geoff

412usa

18-11-17 07:47 PM

Thanks Geoff. Much appreciated.

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