Re: Simmons carb
The Simmons alloy carburetor also had the high speed or power passage like the cast iron version . The power passage came into action at near wide open throttle , similar to the model B Zenith . Instead of a high speed jet , the Simmons used a high speed passage . The main hold back over the model B carb was that the Simmons carb had the same size throat as the Zenith 1&2 carburetors that restricted air flow . I haven't seen a flow test on the cast iron Simmons carburetor . Flow tests showed that the Simmons alloy had the worse flow than others like Zenith 1&2 , Tillotson model X and the Marvel carb .
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