# Engine definition. Dimensional keys state their units.
schema_version = 1
id = "twin"
name = "600 cc parallel twin"
category = "Twins / parallel"
description = "EFI motorcycle baseline"
order = 0
cycle = "four_stroke"

[engine]
bank_angle_deg = 56.0
collector_volume_litres = 0.15
cylinders = 2
initial_rpm = 2000.0
initialize_phased_charge = false
layout = "inline"
maximum_load_torque_nm = 30.0
minimum_substeps = 1
phase_degrees = [0.0, 180.0]
pipe_damping = 1.0
plenum_volume_litres = 1.0
starter_torque_nm = 18.0
throttle_diameter_mm = 26.0
topology = "collector"

[cylinder]
afr = 14.7
ambient_temperature_k = 300.0
bore_mm = 75.0
burn_duration_deg = 60.0
burn_start_deg = 5.0
compression = 11.5
energy_variation = 0.05
exhaust_close_deg = 390.0
exhaust_open_deg = 130.0
exhaust_valve_count = 1
exhaust_valve_diameter_mm = 26.0
exhaust_valve_lift_mm = 7.5
fuel_lhv_j_per_kg = 4.4e+07
heat_transfer = 100.0
intake_close_deg = 590.0
intake_open_deg = 340.0
intake_valve_count = 1
intake_valve_diameter_mm = 30.0
intake_valve_lift_mm = 8.0
misfire_probability = 0.0
rod_mm = 112.0
stroke_mm = 68.0
wall_area = 0.02
wiebe_a = 5.0
wiebe_m = 2.0

[crankshaft]
friction_constant_nm = 5.0
friction_quadratic_nm_s2 = 0.0
friction_viscous_nm_s = 0.003
inertia_kg_m2 = 0.04

[ecu]
idle_base_opening = 0.08
idle_control = "feedback"
idle_ki = 4e-05
idle_kp = 0.0001
idle_max_opening = 0.25
idle_minimum_advance_deg = -5.0
idle_rpm = 1800.0
idle_spark_gain = 0.0
ignition_map = [[0.0, 10.0], [15000.0, 40.0]]
overrun_cut_rpm = 3500.0
overrun_fuel_cut_enabled = true
overrun_ignition_cut_enabled = false
overrun_resume_rpm = 2400.0
power_afr = 12.8
rev_limit_enabled = true
rev_limit_fuel_cut_enabled = true
rev_limit_rpm = 10000.0
rev_resume_rpm = 9750.0
stoichiometric_afr = 14.7
throttle_closing_rate = 0.0
throttle_closing_time_constant_s = 0.0
throttle_rate = 1000.0
throttle_time_constant_s = 0.001

[vehicle]
air_density = 1.225
clutch_capacity = 80.0
clutch_engagement_rate = 8.0
drag_coefficient = 0.7
final_drive_ratio = 2.7
frontal_area = 0.65
gear_ratios = [4.1, 2.7, 2.0, 1.55, 1.25, 0.98]
gravity = 9.80665
mass_kg = 160.0
primary_reduction = 1.8
rolling_resistance = 0.015
rotational_inertia_kg_m2 = 1.2
wheel_radius_mm = 320.0

[fuel]
system = "injection"

[[pipes]]
id = "intake"
cells = 10
diameter_mm = 27.5
length_mm = 60.0

[[pipes]]
id = "runners"
count = 2
cells = 10
diameter_mm = 27.5
length_mm = 120.0

[[pipes]]
id = "primaries"
count = 2
cells = 6
diameter_mm = 28.0
length_mm = 200.0

[[pipes]]
id = "tailpipe"
cells = 10
diameter_mm = 28.0
length_mm = 400.0