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About the application:

If you are a hobby gearhead or professional engine or chassis builder, you’ll wish Gearhead Pro! Gearhead Pro is the calculator apk that us gearheads use for a lot of performance automotive parameters. It calculates or estimates numerous engine, exhaust, gearing, tire, suspension, acceleration, weather effects, and another car parameters along with automotive unit conversions and fastener torque and threading parameters. Gearhead Pro works in both standard and metric troops and even has advanced settings to customize the calculations to your specific scenario so you can choose the most compatible parts for your application. Gearhead Pro calculates or estimates: Speed/Gearing - Engine RPM from car speed, gearing, tire size - Car Speed from engine RPM, gearing, tire size - Axle Gear required for a specific RPM at a certain speed with a given tire size - Tire Diameter and Cross section width from sidewall size - Easy gear ratios based on drive and driven tooth count Boat - Boat Speed from propeller pitch, slip, RPM and gearing - Boat Propeller Slip from pitch, RPM, Speed, and gearing - Easy gear ratios based on drive and driven tooth count Engine - Displacement from cylinders, bore, and stroke - Bore/Stroke ratio - Static Compression Ratio - Average Piston Speed - Airflow - Airflow w/boost pressure - Connecting Rod Ratio - Maximum connecting rod angle from cylinder axis - Compression Height (piston wrist pin height) - Dynamic Compression Ratio from the point the intake valve closes - Effective Compression Ratio (both static and dynamic) using boost pressure - Head gasket volume (from bore and compressed thickness if round) - Valve opening and closing happenings from the cam duration, IC, and LSA - Cam specs from the valve opening and closing happenings - Valve overlap - Valve lift based on fresh rocker ratio or lobe lift and rocker ratio - Valve spring forces from valve spring specs to actual installed height and lift - Tag dimension on your balancer to set a desired timing advance Engine Externals - Minimum air filter size for your engine - Suggested header basic tube size for your engine - Suggested exhaust size for your engine - Cross-sectional flow place of a pipe, or the pipe size from a desired flow place - Pressure ratio and mass airflow for turbocharger selection - Power potential of a turbocharged engine configuration - Pressure ratio and airflow for supercharger selection - Power potential of a supercharged engine configuration - Starting pulley ratios and sizes for a supercharged engine Suspension - Instant center, Roll Center and Axis, and Anti-Squat of a 4 link rear suspension - Cg height of your car using the raise one end way - Combined and secondary spring rates of a dual spring coil-over setup Weather - Specific humidity - Air Density Index - MSA density altitude - Power Correction Factor of the current weather conditions Power - Power from Torque and RPM, or vice versa Fasteners and Threading - Convert fastener torque troops to your torque wrench unit - Lookup or calculate a cutting tap drill size either standard or custom thread - Torque of a fastener based on thread size and pitch, fastener grade, thread finish… - Minimum thread length engagement of a fastener in a tapped hole Unit Conversions - Length - Place - Volume - Absolute Pressure - Engine Vacuum/Boost - Temperature - Speed - Volume Flow - Mass Flow - Power - Torque - BSFC Fuel System - Total Fuel system flow for fuel pump selection - Fuel injector flow for injector selection - Convert an injector flow rating to a fresh pressure or flow Acceleration - Power of your engine based on your drag racing performance and weight - Drag performance based on power and weight - Time you would run on a ¼ mile track (.4 km) based on 1/8 mile (.2 km) performance - ET or speed based on a previous ET or speed and a weight or weather change - More power required to achieve a fresh ET or speed