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Originally Posted by roosterk0031
Your heater is thermostatically controlled, do you know the on/off temps?
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The setpoint is 238F.
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If the relatively low mass of the oil & pan heat up, maybe it's cycling and will never heat the coolant any more than that +10-15 degrees your test showed.
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Exactly. And there's the thermal loss from the block to ambient to consider as well.
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If you can get the same heater stuck to the block it might stay on longer and might show a bigger change.
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Aluminum block.
Not to mention it being a tiny, tightly packed engine with not much in the way of large flat unallocated surfaces. I think an actual block or coolant heater will be the way to go for that (for the CARDIS, at least).
Cheers,
Rick