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While driving and keeping the engine under load the operating temperature doesn't seem to change a lot.
But idling, with the heat blowing I have seen it drop from 190'F down to 160'F in little more than 10 minutes when running non turbo.
Adding the turbochargers to the cooling circuit has helped this.
Iron has lower specific heat, but is almost always black so emissive losses will be higher.
Aluminum holds more heat and the blocks are usually bare finished and some what reflective, cutting down on IR emissions.
If you have an aluminum and iron block offering for a specific engine, you can bet the iron block will come up to operating temperature faster and also cool off faster.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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