d04924.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
75-00-00
page 6
August 01/2012
Coolant temper-
ature and cylin-
der head
temperature
Correlation between coolant temperature and cylinder head tempera-
ture
There is in principle a regular relationship between coolant temperature
and cylinder head temperature. The coolant transfers some of the com-
bustion heat to the radiator. Thus, the coolant temperature is usually lower
than the cylinder head temperature. But the temperature difference
between coolant and cylinder head is not constant and can vary with dif-
ferent engine installation (cowling or free installation, tractor or pusher,
flight speed, etc.).
NOTE: The basic requirement for safe operation is that boiling of
conventional coolant must be prevented. The boiling point
of conventional coolant is 120 °C (248 °F) with a 50/50 mix-
ture proportion and a system pressure of 1.2 bar (18 psi).
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