cooling of the engine by directing air from the propeller  to the critical areas of the engine, particularly the cylinder  heads and barrels. The use of these ducts remove the need  to design and manufacture baffles and the establishment of a  plenum chamber, which is the traditional method of cooling  air-cooled, aircraft engines. The fact that these baffles and  plenum chamber are not required also ensures a cleaner  engine installation, which in turn facilitates maintenance and  inspection of the engine and engine components. The engine is fitted with a 1.5 kilowatt starter motor that  is also manufactured by Jabiru and provides very effective  starting. The engine has very low vibration level; however,  it is also supported by four large rubber shock mounts  attached to the engine mounts at the rear of the engine.  The fuel induction system uses a pressure compensating  carburetor. Following the carburetor, the fuel/air mixture is  drawn through a swept plenum chamber bolted to the sump  casting, in which the mixture is warmed prior to entering  short induction tubes attached to the cylinder heads. An effective stainless steel exhaust and muffler system is  fitted as standard equipment ensuring very quiet operations.  For owners wanting to fit vacuum instruments to their  aircraft, the Jabiru engines are designed with a vacuum  pump drive direct mounted through a coupling on the rear  of the crankshaft. The Jabiru 2200cc aircraft engine is a four-cylinder, four- stroke horizontally opposed air cooled engine. At 132 pounds  (60kgs) installed weight, it is one of the lightest four-cylinder,  four-stroke aircraft engines. Small overall dimensions give  it a small frontal area width (23.46 in, 596mm) that makes it  a good engine for tractor applications. The Jabiru engine is  designed for either tractor or pusher installation. The Jabiru  engine specifications are listed in  Figure 11-16 . The Jabiru 3300 (120 hp) engine features  [Figure 11-17] : Aeromax Aviation produces a version of a 100 hp engine  called the Integral Front Bearing. The engine features a  special made integral front bearing.  [Figure 11-18]  The  engine uses an integral permanent magnet 35 amp alternator,  lightweight starter, and dual ignition. The compact alternator  and starter allow for a streamlined and aerodynamic cowl  which improves the fuel efficiency of an experimental  aircraft. The Aeromax aircraft engine is an opposed six- cylinder, air-cooled, and direct drive. Being a six-cylinder  engine, it has smooth operation. The Aeromax engines are  known for their heat dissipation qualities, provided the proper  amount of cooling air is provided.  It features a crank extension supported by a massive integral  front bearing (IFB) and bearing housing. These engines start  out as a GM Corvair automobile core engine. These basic  core engines are disassembled and each component that is  reused is refurbished and remanufactured. The crankshaft in  the Areomax 100 IFB aircraft engine is thoroughly inspected,  including a magnaflux inspection. After ensuring the crank  is free of any defects, it is extended by mounting the crank  extension hub on its front. Then, the crank is ground true,  with all five bearings’ surfaces (four original and the new  extended crank’s front bearing), being true to each other and  perpendicular to the crank’s prop flange.  [Figure 11-19] All radiuses are smooth with no sharp corners where stress  could concentrate. Every crankshaft is nitrated, which is a  heat/chemical process that hardens the crank surfaces. The  crank reinforcement coupled with the IFB is required to  counter the additional dynamic and bending loads introduced  on the crank in an aircraft application. The engine case is  totally refurbished and checked for wear. Any studs or bolts  that show wear are replaced. The engine heads are machined  to proper specifications and all new valves, guides, and valve  train components are installed. A three-angle valve grind and  lapping ensure a good valve seal. Once the engine is assembled, it is installed on a test  stand, pre-lubricated, and inspected. The engine is, then,  run several times for a total of two hours. The engine is  carefully inspected after each run to ensure it is in excellent  operating condition. At the end of test running the engine,  the oil filter is removed and cut for inspection. Its internal  condition is recorded. This process is documented and  Jabiru 2200 Aircraft Engine Aeromax Aviation 100 (IFB) Aircraft Engine • 4-stroke •  3300cc engine (200 cubic inches)  •  6-cylinder horizontally opposed  •  1 central camshaft  •  Fully machined aluminum alloy crankcase •  Overhead valves (OHV) - push rod operated •  Ram-air cooled  •  Wet sump lubrication - 4 liter capacity •  Direct propeller drive  •  Dual transistorized magneto ignition  •  Integrated AC generator  •  Electric starter  •  Mechanical fuel pump  •  Naturally aspirated - 1 pressure compensation  carburetor  11-12