d04924.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
75-00-00
page 8
August 01/2012
Waterless coolant:
Waterless coolant has a very high boiling point that prevents coolant loss
due to “boiling over“ (vapor loss), but not to prevent detonation, which can
occur with cylinder head temperatures higher than 150 °C (300 °F) (for
ROTAX 912 A/F/UL) and 135 °C (275 °F) (for ROTAX 912 S/ULS). It does
not require pressure to maintain its boiling point. Due to a lower thermal
conductivity the engine temperature will typically run about 5-10 °C (41-
50 °F) higher with waterless coolant.
Permanent monitoring of cylinder head temperature is necessary.
Additional monitoring of the actual coolant temperature is possible but not
necessary for waterless coolant.
NOTE: When using EVANS NPGR, NPG+ or added pure ethylene
glycol as a coolant, note that these fluids have a flammabi-
lity rating 1 (classification LOW at a scale from 0 to 4). The
mentioned coolants are complying according to their mate-
rial safety data sheet with a flammability classification,
which has only low danger and a low risk of flammability. To
date, no cases in engine operation or flight operation, labo-
ratory conditions or from the field were reported, which
show unsafe conditions of ROTAX aircraft engines in com-
bination with the relevant coolants.
Marking See Fig. 3.
Marking of the coolant to be used:
The coolant to be used and its concentration (percent-
age water rate) must be correctly communicated to the
owner.
Waterless coolant must not mix with water, as other-
wise it will lose the advantages of a high boiling point.
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