Re: Mike P 1955 400 Slow Resto Thread!
Posted by DavidPackard On 2022/7/11 15:44:11
Mike and I have had several PM conversations about Daytona style fuel valves (aka needle & seat). I initially concluded Daytona was using extra gaskets to achieve the desired float level. While that may still be correct, my understanding now is Daytona makes valves of a particular height, and that height is not necessarily the height of the OEM valve, which is a critical characteristic in the float level determination/adjustment. To achieve the OEM valve height Daytona uses up to 3 fuel valve gaskets where the OEM uses 1 gasket. Dayton also acknowledges that their valve may not need additional gaskets for non-Carter applications as in Mike’s case. I surely missed the point that Mike had a Rochester unit.
The following are the instructions included in the packaging of the Daytona valves:
FLOAT VALVE GASKET INSTRUCTIONS
To maintain correct needle & seat height,
use the following RECOMMENDED guide
to install the close tolerance gaskets in this kit.
CARTER APPLICATIONS, use 3 gaskets
ALL OTHER BRANDS, use 1 or 2 gaskets
If a valve is installed that is substantially shorter (measured from the gasket surface to the end of the needle) than the OEM valve the float tang adjustment will be beyond the intended range and will likely apply a side load to the needle. Since the Daytona specific instruction come separately, the general instruction set that comes with carburetor kits will not necessarily mention those instructions.
Those of us that use a Daytona style valve(s) in our Carter carburetors should be aware of the supplementary instructions, and when in doubt as to the number of gaskets to use a measurement from the gasket sealing surface to the end of the needle will be the determining factor.
My guidance of ensuring the float tang is pressing on the center of the needle when the valve is closed is likely valid.
dp
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