—Update 10/24 posted below—
How much should a HX cool the coolant?
In this case, 2” diameter HX in Universal M18. Thermostat 165. Motor has run at 165 forever. Now recently on a couple long motoring back to harbor trips, trending up over about 2 hours to 185 before I stop the boat and let it drop to 165 in about 3 minutes at idle.
Sea temp 68.
Coolant level is correct.
Omitting details - Assume all additional aspects of the cooling systems are tip-top. Bottom and prop are clean etc.
Now analyzing if the HX has reduced cooling power due to maybe internal buildup.
When measured with infrared gun at one point at cruising speed, when at 180 at the thermostat housing and elsewhere, coolant pump intake was 145. So the HX is reducing coolant temp by 35 degrees.
Is this normal or is the HX underperforming?
How much should a HX cool the coolant?
In this case, 2” diameter HX in Universal M18. Thermostat 165. Motor has run at 165 forever. Now recently on a couple long motoring back to harbor trips, trending up over about 2 hours to 185 before I stop the boat and let it drop to 165 in about 3 minutes at idle.
Sea temp 68.
Coolant level is correct.
Omitting details - Assume all additional aspects of the cooling systems are tip-top. Bottom and prop are clean etc.
Now analyzing if the HX has reduced cooling power due to maybe internal buildup.
When measured with infrared gun at one point at cruising speed, when at 180 at the thermostat housing and elsewhere, coolant pump intake was 145. So the HX is reducing coolant temp by 35 degrees.
Is this normal or is the HX underperforming?
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