Carburetor Heat Shield

Posted by Donald Booth On 2020/9/4 1:36:55

Ever since the engine on my 50 Deluxe 8 was recently rebuilt, it seems to be running hotter than I remember it running before. I realize there are contributing factors, namely the recent rebuild - everything fits tighter, the fact that it was bored out to .030 over - it now has a larger compression chamber, and that the supplemental gauges I added may not be accurate - but I digress.

The real question is about the effect of the engine heat on the carburetor and the glass fuel filter bowl. I have observed bubbling in the glass bowl. Dare I say it looks like the gas is boiling. Is that common? Or is it really some other phenomenon taking place that is making the gas bubble? If that is possible that the gas is actually boiling, has Packard ever had some kind of heat shield under the carburetor and fuel filter bowl? I suppose that would only make a difference if the heat was primarily coming from the exhaust manifold, rather than the entire engine compartment being just as hot as the area immediately around the carburetor.

Anyone have any thoughts on this?