In This App Included :

~ Two 2 Stroke Engine Tuning/Modification Calculator :
- Port/Porting Duration (Exhaust & Transfer Port, Piston Port Inlet & Rotary Valve Inlet)
- Transfer Port/Porting Designs (2 3 4 5 & 6 Transfer Port/Porting Designs)
- Exhaust Port/Porting Designs (Rounded Rectangle Shaped, Egg Shaped, D Shaped, Stadium Shaped & Ellipse Shaped Exhaust Port/Porting)

~ Four 4 Stroke Engine Tuning/Modification Calculator:
- Camshaft/Noken as Checker/Calculator (Intake Open, Intake Close, Exhaust Open, Exhaust Close, Intake Duration, Exhaust Duration, Total Duration, Lobe Center Intake, Lobe Center Exhaust, Lobe Separation Angle (LSA), Overlap/Overlaping & Advance/Ret4rd, lobe Center Line
- Ideal Camshaft/Noken as Duration (Camshaft Characteristics for Standard, Short Track, Long Track, Semi Race, Full Race, Drag Race/racing, Road Race/Racing, MX Moto Cross/Grass Track)
- Camshaft/Noken as Designs
- Valves (Ideal Maximum Valve Lift, Ideal Valve Diameter Size 1 2 or 3, Valve Diameter Size Converter, Rocker Arm & Lift/New Lift at The Valve, Valve Shim Tightness & Valve Angle)
- Intake/Inlet Port/Porting Designs (Ideal Gas Speed, Round Shaped, Squircle Shaped & Stadium Shaped Intake Port/Porting Designs)
- Exhaust Port/Porting Designs (Round & D Shaped Exhaust Port/Poring Designs)

~ Nitrous Oxide Fuel Jet Nozzle Size Diameter Calculator
~ Volume Of Coolant System (Find Volume of Coolant & Find Coolant Percentage)
~ Clutch Torque Transmitted
~ Ignition Timing Spark Plug Calculator (Pick Up Pulser, Find Timing Mark, Find Timing Degrees BTDC Before Top Dead Centre, mm inch to Degrees BTDC, Degrees to mm inch BTDC, Ideal Ignition Timing Static & Maximum Advance Depends on Camshaft Duration & Combustion Chamber Type)
~ Turbocharger calculator
~ Supercharger calculator
~ Crankshaft/Kruk As Bob Weight Balance Calculator
~ Velocity Stack Intake Runner Calculator (Carburetor CFM & Velocity Stack Intake Runner Length/Diameter Size)
~ Ideal Carburetor Venturi Size Calculator
~ Pilot and Main Jet Jetting Size Calculator
~ Carburetor CFM Calculator
~ Carburetor Tuning Troubleshooting Guide
~ Boost Bottle Designs Development Calculator (Cylinder Shape, Cylinder to Sheet Metal, Box Development
~ Electric Vehicle Road Speed Calculator
~ 2 & 4 Two Four Stroke Exhaust Expansion Chamber Pipe Muffler Silencer Design (2 &3 Stage Diffuser) Calculator
~ Compression Ratio Calculator for 2 & 4 Stroke Engine
- Static & Dynamic or Uncorrected & Corrected Compression Ratio
- Piston Dome or Dish & Cylinder Head Chamber Volume
- Cranking Pressure
- Intake Valve Closing Swept & Engine Displacement Volume
- Boost Pressure
- Find Compression Height, Deck Clearance, Connecting Rod Length, Deck Height, Piston Stroke Length
- Octane Numbers
- Squish Clearance Measurement
- Flywheel Energy Storage Calculator
- Crankshaft Torque Calculator (Over Bore, Stroke & Square)
- Close Wide Transmission Gear Ratio Calculator (Rasio Racing)
- Desired Swept Volume (Find piston stroke length & cylinder bore diameter)
- Capacitor Discharge Ignition (CDI)
- Piston Ring Gap
- Two 2 Stroke Squish Band Velocity
- Fuel Oil Mixture Ratio
- Pen Stroker Calculator
- N1tr0 M3than0l

// Option A //

To download Engine Tuning Calculator PRO mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Engine Tuning Calculator PRO mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Engine Tuning Calculator PRO from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Engine Tuning Calculator PRO in HappyMod App.