# Engine definition. Dimensional keys state their units.
schema_version = 1
id = "big-carb"
name = "8.0 litre / carbureted big-block"
category = "V8 / big-block"
description = "Cross-plane firing / American 4-2-1 + H / carb fuel transport"
order = 29
cycle = "four_stroke"

[engine]
bank_angle_deg = 90.0
collector_volume_litres = 2.0
cylinders = 8
initial_rpm = 1120.0
initialize_phased_charge = true
layout = "v"
maximum_load_torque_nm = 30.0
minimum_substeps = 1
phase_degrees = [0.0, 450.0, 270.0, 540.0, 630.0, 360.0, 180.0, 89.99998]
pipe_damping = 1.0
plenum_volume_litres = 8.0
starter_torque_nm = 201.1122
throttle_diameter_mm = 85.0
topology = "american_v8"

[cylinder]
afr = 14.7
ambient_temperature_k = 300.0
bore_mm = 114.3
burn_duration_deg = 65.0
burn_start_deg = 5.0
compression = 9.0
energy_variation = 0.05
exhaust_close_deg = 370.0
exhaust_open_deg = 140.0
exhaust_valve_count = 1
exhaust_valve_diameter_mm = 36.576
exhaust_valve_lift_mm = 10.287
fuel_lhv_j_per_kg = 4.4e+07
heat_transfer = 100.0
intake_close_deg = 570.0
intake_open_deg = 350.0
intake_valve_count = 1
intake_valve_diameter_mm = 43.434
intake_valve_lift_mm = 11.43
misfire_probability = 0.0
rod_mm = 176.4
stroke_mm = 98.0
wall_area = 0.02
wiebe_a = 5.0
wiebe_m = 2.0

[crankshaft]
friction_constant_nm = 32.17795
friction_quadratic_nm_s2 = 0.0
friction_viscous_nm_s = 0.03217795
inertia_kg_m2 = 0.9653385

[ecu]
idle_base_opening = 0.07
idle_control = "fixed"
idle_ki = 4e-05
idle_kp = 0.0001
idle_max_opening = 0.25
idle_minimum_advance_deg = -5.0
idle_rpm = 800.0
idle_spark_gain = 0.02
ignition_map = [[0.0, 10.0], [750.0, 12.0], [2500.0, 28.0], [4000.0, 32.0], [6000.0, 30.0]]
overrun_cut_rpm = 2000.0
overrun_fuel_cut_enabled = false
overrun_ignition_cut_enabled = true
overrun_resume_rpm = 1100.0
power_afr = 12.8
rev_limit_enabled = true
rev_limit_fuel_cut_enabled = false
rev_limit_rpm = 7000.0
rev_resume_rpm = 6750.0
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 = 1769.787
clutch_engagement_rate = 8.0
drag_coefficient = 0.4
final_drive_ratio = 3.623529
frontal_area = 2.0
gear_ratios = [3.35, 1.93, 1.29, 1.0, 0.68]
gravity = 9.80665
mass_kg = 1400.0
primary_reduction = 1.0
rolling_resistance = 0.015
rotational_inertia_kg_m2 = 1.2
wheel_radius_mm = 320.0

[fuel]
system = "carburetor"
pilot_jet_diameter_mm = 0.2337673
main_jet_diameter_mm = 4.524528
needle_jet_diameter_mm = 4.656493
needle_low_scale = 0.6
needle_mid_scale = 0.65
needle_off_idle_scale = 0.964
needle_quarter_scale = 0.64
needle_tip_scale = 0.782
needle_transition_scale = 0.89
needle_upper_scale = 0.76
bowl_capacity_kg = 0.1
bowl_refill_kg_per_s = 0.1

[junctions]
h_pipe = true
junction_volume_cc = 50.0

[[pipes]]
id = "intake"
cells = 3
diameter_mm = 70.0
length_mm = 180.0

[[pipes]]
id = "runners"
count = 8
cells = 2
diameter_mm = 38.0
length_mm = 120.0

[[pipes]]
id = "primaries"
count = 8
cells = 15
diameter_mm = 38.0
length_mm = 750.0

[[pipes]]
id = "secondaries"
count = 4
cells = 8
diameter_mm = 45.0
length_mm = 400.0

[[pipes]]
id = "bank_collectors"
count = 2
cells = 11
diameter_mm = 50.0
length_mm = 550.0

[[pipes]]
id = "tailpipes"
count = 2
cells = 25
diameter_mm = 50.0
length_mm = 1250.0

[[pipes]]
id = "crossover"
cells = 16
diameter_mm = 38.0
length_mm = 780.0