Jabiru 5100 – 8 Cylinder Limited Engine

History

Jabiru 5100 is a direct drive engine featuring standard equipment like dual ignition systems, vacuum pump drives, silencers, and alternators.

Jabiru Aircraft developed this engine from its previous brands: Jabiru 3300 aero-engine and Jabiru 2200 aero-engine. These two engine brands feature strokes and bores measuring 97.5mm by 74 mm.

The bore, measuring 97.5mm, is the only feature the 5100 cc engine shares with the Jabiru 3300 aero-engine and the Jabiru 2200 aero-engine. The main difference is its stroke, which the developers increased from 74 millimeters to 85 millimeters.

This lightweight engine is the product of top-notch aluminum blocks. Jabiru aircraft designers machine these light engines using the modern CNC machine tools. Besides this, the designers also test and measure all engine components using computerized and highly accurate devices, featuring two microns’ accuracy.

The 8-cylinder engine offers simple features at a realistic price. Besides supporting low maintenance, this engine also features wide times between the overhaul.

Specification Table

TypeFlat-8
Dry weight117 kg with alternator, ignition system, exhaust, starter motor, and carburettors
Width25.12 inches
Stroke3.346 inches
Height17.54 inches
Displacement5077 centimetres cubic
Bore3.84 inches
Oil systemWet sump
Fuel systemMechanical fuel pump
Cooling systemAir-cooled
Fuel typeAVGAS 100/130
Prop shaft rotationclockwise
Spark plugsAutomotive-NGK D9EA
Oil capacity6 quarts
Compression ratio8.5:1

Jabiru 5100 Engine Description

Features

● 1000 hour TBO

● Two-pressure compensating carburetors

● Pusher and tractor configuration

● Eight-cylinder horizontally opposed

● Electric starter

● Mechanical fuel pump

● Ten bearing crankshaft

● Integrated AC generator

● Overhead valves

● Four-stroke

● Ram-air cooled

● Direct propeller drive

● Wet-sump lubrication

● Pushrods

Design

As per Jabiru, the Jabiru 5100 engines allow light aircraft designers to develop new light aircraft. The design of these eight-cylinder engines explains why their manufacturing process takes place in small quantities. The aircraft designers develop these aircraft engines using modern Computer Numerically Controlled machines.

A significant percentage of engine components’ production occurs in Southern Queensland, which hosts several high-technology small-sized companies. The designs machine most engine parts from solid aluminum billets and chrome-molybdenum steel solid billets. Jabiru machines the smaller parts from the larger parts to minimize costs and reduce wastage.

This engine features a direct crankshaft-driven propeller that doesn’t rely on a reduction gearbox. This feature reduces the engine’s maintenance costs and contributes to the engine’s lightweight design. In the crankshaft, there is a removable propeller flange. This flange makes it easy to replace the engine’s front crankshaft seal and fix the propeller shaft extension in particular applications.

Jabiru sources various engine components from many suppliers.

Ignition system & Integral alternator

The engine’s integral alternator uses rare earth magnets to produce alternating current for the electrical accessory drive and battery charging. The designers have mounted this alternator on the engine’s flywheel, and the crankshaft plays a pivotal role in driving it directly.

There are rare earth magnets in the flywheel that energize the two fixed coils attached next to the flywheel. This feature explains the transistorized electronic system nature of the ignition system. The two fixed coils’ positioning and movement produce a high voltage current which the high tension leads transport to the two distributor’s centre before getting distributed to the spark plugs.

Moreover, the fixed timing ignition system plays a crucial role in eliminating the requirement for timing adjustment. The ignition system does not rely on battery power, and it’s self-generating and fully redundant.

Oil Pump, Pistons & Crankshaft

Jabiru designers positioned a double bearing at the Jabiru 5100 crankshaft’s propeller flange end. Also, they designed the primary bearing between each of the crankshaft’s big ends. As a result, this explains why the crankshaft doesn’t feature flying webs. The thrust bearings featured at the crankshaft’s front double bearing enhance pusher and tractor installation.

Jabiru source pistons in Australia, and they re-match them to add a piston circlip groove. The designers fit these pistons with three rings, whereby the second rings and top rings are the products of cast iron. This material explains why the rings match excellently with the cylinder bores.

The engine designers have directly mounted the oil pump on the camshaft. Also, they have incorporated a small spin-on filter that facilitates engine lubrication. Furthermore, this Jabiru engine features an oil cooler adapter, which ensures Jabiru 5100 installations meet the set oil temperature limits.

RAMAIR Cooling Ducts

Jabiru has incorporated this engine with RAM AIR cooling ducts to enhance its cooling and direct the propeller’s air to the engine’s critical parts, such as the barrels and cylinder heads. These RAMAIR cooling ducts serve as excellent components for the engine installer or home builder because of their ability to prevent the plenum chamber establishment and baffle design and development requirements.

The elimination of the plenum chamber establishment and baffle design and development requirement means a ‘cleaner’ Jabiru engine installation. Also, this feature results in hassle-free engine maintenance and inspection. Therefore, the design team has already handled the challenging engine installation process for you.

Moreover, the RAM AIR ducts facilitate pusher and tractor configurations as the special ducts enhance specific installations. 

Starter Motor & Pressure Compensating Carburettor

Jabiru 5100 features a 1.4 kilowatts starter motor that delivers a good start. Besides the low vibration levels, this engine also features four rubber shock mounts positioned on its mounts.

Next, there is the fuel induction system that features two pressure compensating carburetors. After the carburetion process, the air and fuel mixture moves to the swept plenum positioned on the crankcase, where it gets warmed before moving to the short induction tubes featured on the cylinder heads.

Also, Jabiru 5100 engine features a muffler system and an exhaust system that results in quiet operations.

Performance

Jabiru 5100

Jabiru 5100 has a continuous power output of 170 horsepower at 2,700 RPM and an intermittent power output of 180 horsepower at 3,000 RPM. It has a compression ratio of eight to one and a power to weight ratio of one to ten kilowatt per kilogram.

Applications

● Quik-kit Glass Goose

● Ibis GS-750 Grand-Magic

Final Thoughts

Jabiru 5100 is amongst the top-rated aircraft engines to consider because Jabiru designers have developed it within the CASA authorized quality assurance standards. Besides this, this engine comes with a warranty of 12 months from the date of the verified first flight.

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