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High Temp Engine Miss

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MikeAH100M

MikeAH100M

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I seemed to have solved my BN2 overheating issue with Texas cooler fan, a thorough flush and adding additional cells to the radiator. However, on hot days when the water temp hits about 190F (typically sitting at a traffic light), the engine starts missing heavily. I can resolve the miss slightly by pulling the choke. The miss goes away after I get rolling and the temp drops. Seems like a vapor-lock kind of issue. Any prevention suggestions? Insulating fuel lines and float bowl? I have the worthless little standard heat shield on the manifold. Was also wondering if the larger heat shield I saw in Norm Nock's technical articles was effective. Thanks for any ideas.
 
Could be vapor-lock or also electrical at the high temp. Are you running electronic or points/condenser ignition? There are times when the condenser or coil fails at high temps. But then again, 190F is still nominal.
 
Running points and condenser ignition. I'll check those. The fact that pulling the choke resolves the issue somewhat got me thinking that it was fuel related, but maybe not. Thanks
 
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