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High Temp Engine Miss

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.
 

gonzo

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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.
 
OP
MikeAH100M

MikeAH100M

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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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