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Jabiru Aircraft
Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
REVISION
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Dec 2016
Page: 34 of 56
Figure 37. Cobra Head for Installations with Minimum Carburettor Clearance
6.3
Air Filter
The induction system must not cause positive RAM induction pressure as this will have an unpredictable
affect the fuel/air mixture supplied to the engine.
The filter must be capable of supplying 250 kg/hr (550 pph) of air
The filter may have to be changed at regular intervals if the engine is to be used in a dusty environment.
Air flow should be as direct as possible, no tight bends and air taken from outside the cowl. Current air filter
is RAF 17 (Repco)
6.4
Ram Air Bleed
The hot air mixer box / filter boxes manufactured by Jabiru Aircraft have a Ram Air Bleed flap incorporated.
This flap prevents excess ram air pressure in the induction system.
If the engine ever backfires, the flap also acts as a relief valve to let the excess pressure escape without
damaging the induction system.
Figure 38. Ram Air Bleed
Firewall
Carburettor
Cobra Head Duct
Vent holes to release
pressure on un-filtered
side of airbox.
Rubber flap covers holes &
prevents excess bust etc
entering airbox.