07-31-2012, 06:36 AM
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CC Member
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Join Date: Aug 2010
Cobra Make, Engine: Lone Star with IRS, 427W with megasquirt, T56 magnum
Posts: 309
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Not Ranked
Another thing for you guys with idle speed cooling issues to consider is idle timing. If you have a vacuum advance and it's hooked up as ported and idles at 8-14 deg advance or so, you're burning a lot of extra fuel to keep your catalytic converter up to temp (which you should not have in the first place).
On the 1978 Chrysler 360, there's a thermostatic vacuum switch (I'm sure many other cars have one as well, but this is one I read all of the emissions chapter on)in the intake manifold's water passage that can switch your vacuum from ported to manifold at somewhere near 200 deg. If you can't be convinced by the recent vacuum advance thread to run your vacuum advance on the manifold, add this little emission device, and when you're about to overheat, it'll give you a few more degrees, upping the idle speed 300 rpm and running cooler.
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