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Old 08-10-2017, 10:13 AM   #2
Bob Bidonde
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Join Date: May 2010
Location: Long Island, NY
Posts: 1,181
Default Re: What do you think about these temps and why?

Your car has 2 factors that cause higher temperatures, higher friction from a recent motor rebuild, and the high compression head.

Flush the radiator with a commercial product to make sure it is clean for optimum heat transfer. Straighten any bent fins.

Use 100% water instead of antifreeze until the temperature becomes normal.

Try optimizing the ignition timing beyond the stock setting to get the most spark advance without knocking. Do this by ear.

Motor oil suffers at high temperatures, so use synthetic oil.

Move your front license plate down to the bumper so it does not block air flow into the radiator. A Model A rear tail-lamp bracket is convenient for this purpose.

When the engine is hot, compare the temperature of the cylinder block at the rear (behind Cyl #4) and the front of the block (in front of Cyl #1). They should be close to the same, but Cyl #4 usually runs a bit hotter. Sometimes there is an accumulation of debris in cooling passages of the block behind Cylinder #4 which causes that cylinder to run a lot hotter.

As running time accumulates on your new engine, the friction will decrease and so should the operating temperature.
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