First Brake Work Brake Mean Effective Pressure Indicated Mean Effective Pressure Friction Mean Effective Pressure Piston Face Area Mass of air in cylinder per cycle Mass of fuel in cylinder per cycle Rate of fuel flow in the engine Rate of air flow in the

2.4.18. Friction Power Lost

Friction Power Lost dapat diperoleh dengan persamaan berikut = Dimana : = Indicated Power = Brake Power

2.4.19. First Brake Work

First Brake Work Wb dapat diperoleh dengan persamaan berikut : Wb = bmep. Dimana : bmep = Brake Mean Effective Pressure = Volume Displacement N Cylinder

2.4.20. Brake Mean Effective Pressure

Brake Mean Effective Pressure bmep dapat diperoleh dengan persamaan berikut : bmep = Dimana : π = 3,14 τ = Torsi = Volume Displacement N Cylinder Universitas Sumatera Utara

2.4.21. Indicated Mean Effective Pressure

Indicated Mean Effective Pressure imep dapat diperoleh dengan persamaan berikut : imep = Dimana : bmep = Brake Mean Effective Pressure Ƞm = Efisiensi Mekanis

2.4.22. Friction Mean Effective Pressure

Friction Mean Effective Pressure fmep dapat diperoleh dengan persamaan berikut : fmep = imep – bmep Dimana : imep = Indicated Mean Effective Pressure bmep = Brake Mean Effective Pressure

2.4.23. Piston Face Area

Piston Face Area Ap dapat diperoleh dengan persamaan berikut : Ap = Dimana : π = 3,14 B = Diameter Silinder Universitas Sumatera Utara

2.4.24. Mass of air in cylinder per cycle

Mass of air in cylinder per cycle ma dapat diperoleh dengan persamaan berikut: ma = Dimana : = Tekanan udara masuk ke silinder = Volume Displacement N Cylinder = Volume Clearance Sisa R = Konstanta Udara = Temperatur udara masuk ke silinder

2.4.25. Mass of fuel in cylinder per cycle

Mass of fuel in cylinder per cycle mf dapat diperoleh dengan persamaan berikut : mf = Dimana : m a = Mass of air in cylinder per cycle AFR = Air Fuel Ratio

2.4.26. Rate of fuel flow in the engine

Rate of fuel flow in the engine f dapat diperoleh dengan persamaan berikut: f = Universitas Sumatera Utara Dimana : m f = Mass of fuel in cylinder per cycle N c = Jumlah Silinder N = Putaran Mesin

2.4.27. Rate of air flow in the engine

Rate of air flow in the engine dapat diperoleh dengan persamaan berikut : a = AFR. Dimana : AFR = Air Fuel Ratio f = Rate of fuel flow in the engine

2.4.28. Brake specific work per unit mass