Subaru 140 HP FI

Need more power?

How does 140 HP sound?

Eagle Aviation now offers the 140 horse power fuel injected ASTM sport certified engine.

This engine is must for those who want our amphibious float option, or who fly in and out of super short fields or just simply want the most horse power available in a sport plane!

SUPER WARNING! You will experience ear to ear grinning with this engine!!

General Specifications are:

  • EA-81 engine block
  • 1781 CC displacement
  • 140 hp @ 5700 RPM
  • 154 foot pounds torque @ 3600 RPM
  • 2000 hour TBO
  • 9.7 to 1 compression ratio
  • 93 octane auto gas (10% alcohol ok) or 100 LL AV gas
  • 50 Amp alternator
  • High capacity aluminum oil pan
  • Fuel injection
  • Direct fire CDI ignition system
  • Super quiet mandrel bent exhaust with muffler
  • Autoflight redrive
  • Dynamometer engine reports with all aircraft

This unique engine features the same technology and processes as the 115 horse Subaru. There are a few subtle yet substantial changes which is what allows for this to be one of the lightest most powerful engines in the sport market.







Each engine has the following components and or processes performed:

  • Forged pistons and rods are used. By using forged versus cast technology, the pistons can handle the higher stress loads that aviation engines demand.












  • A deck plate is used when boring and honing the cylinders. This allows for distortion free boring of the cylinders which happens during the machining process. Also, when torquing the head to the engine can cause an out of round situation which can distort the cylinder bores. By using this process, the rings will seat and seal properly which ensures efficient engine operation.








  • Extra bushings to the main block are added. This keeps the block cases from chaffing against each other at higher horse power loads, RPM’s and ensured better harmonic control.







  • Extra oil channeling is machined in to the thrust main to help guard against excessive axial loads.


  • The rods are conditioned along with the crankshaft and then balanced together. Balancing this assembly ensures smooth engine operation which is why there is an outstanding 2000 TBO.


  • The 140 uses a dual port head. Each head goes through the same process as the engine core. Heat treating and pressure testing are performed. Once the head passes this inspection it is machined to tight tolerances to ensure accuracy and proper fitting. After this is completed, the head and intake system is fully ‘ported’ which simply means the insides are cleaned up and all casting tags of metal area removed. This allows for smooth, even flow of air/fuel to each cylinder. Unlike many engine, even those which are ‘aircraft’ engine do not perform this process. It is time consuming but when done gives the best performance and reliability possible. After this the heads are fitted with stainless steel valves and high performance springs. Next the heads are installed and the engine is fitted with a custom intake manifold. The manifold is custom designed to allow for even length, distance and bends to each head. This allows for even distribution to each cylinder which allows for even operating temperatures for all cylinders.


  • The injection bosses are installed directly into the head. The fuel injection system is controlled by a panel mounted EC-2 controller. This allows the pilot to custom tune the fuel/air in flight or simply leave it in automatic mode, (recommended, as it works flawlessly).


  • Miscellaneous parts installed
    • Shouldered bronze valve guides
    • High performance cam shaft
    • High flow oil pump
    • K&N single air filter
    • Direct fire CDI ignition system

  • Custom tuned high performance super quiet exhaust. The exhaust length is critical and needs to be is direct proportion to the intake inertia for proper resonance tuning and must be collected together for capturing the engine pulse. All exhaust systems are design to extract maximum performance for our engines meanwhile offering a very low mellow tone.






  • Last but not certainly least, the redrive. The redrive of choice is the Auto Flight Redrive. The redrive has it’s own oil bath, not shared with the engine oil. This allows for more economical engine oil changing as you do not need the very expensive gear additive oil for the entire engine. You only need this in the gear box. The gears are mounted with double row angular high load bearings. The unit is maintenance free with occasional oil changes. The redrive also has a flywheel dampener system which smoothes out any possible vibrations.