Joseph Gwinn wrote:
In ,
wrote:

(...)

Normally, I stop warming when the casting is detectably warm to the
touch, probably ~ 100 - 150 F.

It makes the 'nearly impossible' easy.

--Winston-- Keeps an extinguisher handy, too.

Or use a heat gun?

Much safer. Thanks!

This is further support for the theory that the issue is the evaporation
of volatile components of the gas.

That is what I was thinking. I remembered the bad old days of
carburated cars, when winter starts were difficult and summer
starts were relatively easy. I envisioned raw gas puddling in
the cylinder vs. gas vapor doing the 'ignition thing'.

--Winston