# Engine definition. Dimensional keys state their units.
schema_version = 2
id = "fifty"
name = "50 cc / little screamer"
category = "Two-stroke / 50 cc"
description = "Concept single / transported carb fuel"
order = 15
cycle = "two_stroke"

[simulation]
cells_per_meter = 100.0

[two_stroke]
reed_pipe_diameter_mm = 40
transfer_pipe_diameter_mm = 32
initial_rpm = 3000.0
starter_torque_nm = 8.0
maximum_load_torque_nm = 10.0
crankshaft_inertia_kg_m2 = 0.004006997
bore_mm = 40.0
carburetor_diameter_mm = 19.0
exhaust = "racing"
exhaust_duration_deg = 190.0
exhaust_width_mm = 26.54048
friction_bar = 0.4
friction_bar_per_mps = 0.09
friction_bar_per_mps2 = 0.0009
idle_minimum_advance_deg = -10.0
idle_slide_opening = 0.045
idle_spark_gain = 0.05
jet_scale = 0.5
main_jet_scale = 1.6
minimum_burn_s = 0.0005897885
needle_jet_scale = 1.0
needle_low_scale = 2.72
needle_mid_scale = 0.8
needle_off_idle_scale = 12.0
needle_quarter_scale = 1.4
needle_tip_scale = 5.0
needle_transition_scale = 9.0
needle_upper_scale = 0.76
pilot_jet_scale = 0.7125
pilot_tip_scale = 1.0
pilot_transition_scale = 1.0
rod_mm = 81.09593
stroke_mm = 39.8
transfer_duration_deg = 130.0
transfer_width_mm = 36.86178
trapped_compression = 8.2
chamber_sections_mm = [[117.9577, 26.54048, 26.54048], [132.7024, 26.54048, 44.23414], [140.0748, 44.23414, 77.40974], [95.84063, 77.40974, 77.40974], [154.8195, 77.40974, 16.21918], [176.9366, 16.21918, 16.21918]]

[ecu]
idle_control = "fixed"
idle_rpm = 3000.0
idle_max_opening = 0.3
throttle_time_constant_s = 0.0002
throttle_rate = 5000.0
rev_limit_enabled = false
rev_limit_fuel_cut_enabled = false
overrun_cut_rpm = 5000.0
overrun_resume_rpm = 3500.0
overrun_fuel_cut_enabled = false
overrun_ignition_cut_enabled = true
ignition_map = [[0, 10], [3000, 18], [6000, 24], [9000, 18], [11000, 12], [13000, 6], [15000, 2], [18000, 0]]

[vehicle]
primary_reduction = 3.368421
final_drive_ratio = 3.769231
mass_kg = 170
wheel_radius_mm = 331.3
gear_ratios = [2.384615, 1.933333, 1.588235, 1.352941, 1.176471, 1.055556]

[[geometry.cylinders]]
origin_mm = [ 0, 0, 0 ]
tilt_deg = 0.0

# intake
[[geometry.pipes]]
index = 0
points_mm = [
  [ -228.9558, 1.6102, 0 ],
  [ -128.9558, 1.6102, 0 ]
]

# reed passage
[[geometry.pipes]]
index = 1
points_mm = [
  [ -49.5857, 1.6102, 0 ],
  [ -19.5857, 1.6102, 0 ]
]

# transfer passage
[[geometry.pipes]]
index = 2
points_mm = [
  [ 19.5857, 21.1959, 0 ],
  [ 23.8339, 23.9696, 0 ],
  [ 27.519, 26.7484, 0 ],
  [ 30.6412, 29.5324, 0 ],
  [ 33.2004, 32.3215, 0 ],
  [ 35.1967, 35.1159, 0 ],
  [ 36.63, 37.9155, 0 ],
  [ 37.5003, 40.7202, 0 ],
  [ 37.8077, 43.5301, 0 ],
  [ 37.5521, 46.3452, 0 ],
  [ 36.7336, 49.1655, 0 ],
  [ 35.352, 51.9909, 0 ],
  [ 33.4076, 54.8215, 0 ],
  [ 30.9001, 57.6574, 0 ],
  [ 27.8297, 60.4984, 0 ],
  [ 24.1963, 63.3446, 0 ],
  [ 20, 66.1959, 0 ]
]

# exhaust chamber
[[geometry.pipes]]
index = 3
points_mm = [
  [ 20, 75.9959, 0 ],
  [ 130.844, 35.652, 0 ],
  [ 186.9265, -84.6172, 0 ],
  [ 106.5828, -199.3597, 0 ],
  [ 10.7422, -199.3597, 0 ],
  [ -134.7406, -146.4083, 0 ],
  [ -311.6772, -146.4083, 0 ]
]

[[geometry.volumes]]
id = "intake_plenum"
center_mm = [ -89.2708, 1.6102, 0 ]
size_mm = [ 79.3701, 79.3701, 79.3701 ]

[[geometry.volumes]]
id = "crankcase"
center_mm = [ 0, 1.6102, 0 ]
size_mm = [ 39.1715, 39.1715, 39.1715 ]