Subaru EJ series motoren en Megasquirt Engine Management Systems Zaterdag 27 mei 2017 Peter Hortulanus
The low profile of the boxer engine is an automobile based gasoline engine. The maximum power output is reached at around 5000 RPM. You will therefore need a gearbox to reduce this high engine RPM between 2200 to 2500 RPM. Just like Rotax has done with their 912/4 line of engines. The basic engine is designed with a single ignition system It runs on Mogas, is liquid cooled, and can be equipped with a turbocharger (EJ-22) It will deliver power up to 180 BHP, which is more than enough for most small two or four place aircraft.
Subaru 2500cc SOHC, four cylinder, 2 cam 170hp @ 5500rpm; 166 lb-ft Torque@4000 rpm Subaru 2000cc DOHC four cylinder, 4 cam 148hp @ 6000rpm, 146 lb-ft Torque@4200 rpm
Subaru EJ series engines
160 140 120 100 80 60 40 20 RPM-HP RPM- Torque RPM Prop 0 500 1500 2500 3500 4500 5500 6500 8 2.2 4cyl EJ22E 130 @ 5600 137 @ 4400 9.5:1 SOHC 1990-94 Legacy 8A 2.2 4cyl EJ22E 135 @ 5400 140 @ 4400 9.5:1 SOHC 1995-96 Legacy/Impreza 8B 2.2 4cyl EJ22EZ 137 @ 5400 145 @ 4000 9.7:1 SOHC 1997-98 Legacy/Impreza 8C 2.2 4cyl EJ222 142 @ 5600 149 @ 3600 9.7:1 SOHC 1999-01 Legacy/Impreza
Welke PSRU?
De noodzaak voor een goede torsie demper
Wat weegt het allemaal? kg lbs Main engine mount 3,0 6,6 Radiator 4,0 8,8 Coolant 5ltr 5,0 11,0 Coolant hoses 2,0 4,4 Expansion barrel 1,0 2,2 Exhaust manifold 4,5 9,9 Ignition coil 0,5 1,1 Alternator 3,5 7,7 Engine block 115,0 253,3 Inlet manifold 5,5 12,1 Air intake filter ass. 0,5 1,1 Starter motor 3,0 6,6 Lub.Oil 4ltr 4,0 8,8 PSRU 8,5 18,7 PSRU Extension hub 1,5 3,3 PSRU Adaptor plate 2,0 4,4 Propellor 5,5 12,1 Spinner & Prop Bolts 1,0 2,2 Total Weight 170,0 374,4
Subaru powered
What is 'Stoichiometric'? C 8 H 18 + 12.5 O 2 8 CO 2 + 9 H 2 O http://www.megamanual.com/4stroke.gif
Fuel system layout
Fuel system layout
Hoe groot moet de injector zijn? InjectorSize = (HorsePower * BSFC) / (#Injectors * DutyCycle)
A 135 horsepower 4 cylinder engine with 2 throttle body injectors and 0.55 brake specific fuel consumption gives: (135 HP * 0.55 lb/hr/hp) / (2*.85) = ~ 43.7 lb/hr (1 lb/hr ~ 10.5 cc/min) BSFC is the amount of fuel your engine uses to make 1 horsepower for one hour. It is usually between 0.42 and 0.58 at wide open throttle. Normally aspirated engines with efficient combustion processes are at the lower end of the BSFC scale [~0.45], Supercharged engines tend to be towards the higher end [~0.55]
Power & Fuel calculations Relatie tot fuel flow - brandstofdruk
Typical gas composition for combustion engines
Relation between efficiency and power output
Wat heeft een EMS nodig aan data Een Motor Management Systeem gebruikt een aantal basisgegevens zoals: de positie van de krukas Toerental druk in het spruitstuk motor temperatuur Gasklephoek lucht temperatuur lambdawaarde. Aan de hand van deze meetgegevens zorgt de EMS voor de juiste hoeveelheid brandstof en dat het lucht-brandstofmengsel op het juiste moment ontsteekt.
Er zijn vele merken actief
Megasquirt System Hardware
DIY Components
16-Bit Microcontroller
MAP (Manifold Absolute Pressure) sensor Minimum required sensors CLT (Coolant Temperature) sensor TPS (Throttle Position Sensor) IAT/MAT (Intake/Manifold Air Temperature) sensor O2 (Oxygen) Sensor / Lambda Sensor Crank and Cam Tach inputs
Oxygen sensor handling
Variable Reluctance Type Tach / Sync Pulse encoder
Distributor points input
Ontsteking varianten
Ontsteking varianten
Electrical components layout
Fuel system layout example
E-diagram PH-DYL
E-diagram PH-DYL
Hoe werkt megasquirt?
Megasquirt MS2 Manuals
Tuner studio main dashboard
Tuner studio tuning dashboard
Comparing projects within Tunerstudio
Mengverhouding Lucht-Brandstof
Vullingsgraad tabel the numbers in the VE table are a percentage
Ontstekings vervroegings tabel degrees BTDC