Hi Everybody,
This is a continuation of my AMAL COLD and SOOTY thread. I built a test jig to hold a bowl level and retain the float pivot bar whilst filling it with fuel from a similar hydrostatic head as it would be filled from a gas tank. I took an old Amal bowl with the brown plastic float which mechanically measured reasonably close to .080" to .100" below the lip. On the test jig, filling it with fuel, the actual fuel fill was about .220" below the lip. So far so good... I next took the bowl from my COLD and SOOTY right hand Premiere. It is fitted with the aluminum needle and black Stay-Up float. It mechanically measured in the realm of .080" below the lip . On the fuel jig, fuel filled to almost exactly the same level --or .080" below the lip. There was almost no difference. This is certainly above the Amal spec that the fuel fill should be .210" +/- .040" below the lip. Maybe this is related to my cold and sooty troubles.
Thank you,
Kara
Additional test on other bowl with Stay-Up float and aluminum needle: static mechanical level .080" below lip--with fuel on jig the fuel comes up to almost the same height--perhaps .020" lower , but still really high. Now--I tried bending the stainless tangs on the float to lower the fuel level and I got it down, but the geometry seems off and there is almost no allowable movement in the needle. As fuel comes in the needle is tapping like its close to shutting off. It did shut off at an OK level, but there is very little range in either the float or the needle and this does not inspire confidence. The old style float has a generous range of movement and yet rises to the correct level. And the needle does not hammer until near shutoff. I am coming to the conclusion that bending the tangs on the Stay-Up does not really work well and that Amal changed the buoyancy of the new floats and did not do anything to compensate for the change in geometry that this creates.
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