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Calculators

 

Choose one of the categories below - Click on the Title to view the equation used.

 

Engine

Electrical

Mechanical

Ballistics

Pressure

Mathematical

 

Engine

Head gasket calculator

Desired Compression ratio : 1

Current Compression ratio : 1

Stroke Length mm

Current gasket mm

Combined Thickness mm

 

Compression ratio

Bore mm

Stroke mm

Clearance Volume cc

Compression Ratio :1

 

Injector size

Desired Crank Power BHP

Brake specific fuel consumption lbs/BHP-hr         (0.4 to 0.5 for naturally aspirated, up to 0.6 for turbo)

Number of Injectors

Duty cycle %

Injector Size cc / min

 

Fuel pressure increase - injector flow rate

Original injector pressure bar

New Injector pressure bar

Original Injector flow cc / min

Injector flow cc / min

 

Required Air Flow

Desired Crank Power BHP

AFR : 1

BSFC lbs/BHP-hr         (0.4 to 0.5 for naturally aspirated, up to 0.6 for turbo)

Airflow kg/min

 

Volumetric Efficiency

Absolute Pressure Bar         (1.01325 bar at 0 altitude)

Absolute Temperature °C

Gas Constant J kg‾¹ K‾¹         (Dry air 287.058 J kg‾¹ K‾¹)

Current Power BHP

Engine Speed Rpm

Engine Capacity cc

BSFC lbs/BHP-hr         (0.4 to 0.5 for naturally aspirated, up to 0.6 for turbo)

AFR : 1

Volumetric Efficiency %

 

Boost Manifold Pressure Absolute

Air Flow kg / min

Manifold Temperature °C

Volumetric Efficiency %

Engine Speed RPM

Displacement cc

Manifold Pressure Bar

 

Mass air flow conversion

lb/min kg/min

kg/min lb/min

 

Effective Compression Ratio

Static Compression Ratio : 1

Boost Bar

Effective Compression Ratio : 1

 

Effective Compression Ratio

Static Compression Ratio : 1

Boost Psi

Effective Compression Ratio : 1

 

Injector "On" Time

Mass air flow Kg / min

Injector size / flow cc / min

fuel density g / cc                        (Petrol: 0.71 to 0.77, standardised at 0.755 )

Engine speed rpm

Desired AFR

Number of cylinders

Injector "On" Time ms

Note that the injector "on" time rarely changes much with the increase of rpm's, it's a value mainly dependant on the desired AFR. The purpose of this calculator is for the use of mapping the mass air flow sensor to the injector "on" time. It is done at a low idle of around 1000rpm where the mass flow rate can be easily calculated, although not necessary.

 

 

 

Electrical

Voltage, Current and Power

Voltage - V Current - A Power W

Power - W Current - A Voltage V

Power - W Voltage - V Current A

 

Current, Resistance and Voltage

Current - A Resistance - Ω Voltage V

Voltage - V Current - A Resistance Ω

Voltage - V Resistance - Ω Current A

 

Capacitor charge

Voltage Source V

Capacitor starting voltage V

Capacitance uF

Resistance

Time s

Charged voltage V

 

Capacitor discharge

Capacitor starting voltage V

Capacitance uF

Resistance

Time s

Remaining voltage V

 

Capacitor charge current

Voltage source V

Capacitance uF

Resistance

Time s

Charge Current A

 

Resonant Frequency

Inductance mH

Capacitance uF

Frequency kHz

 

Capacitor stored Energy

Voltage V

Capacitance uF

Energy J

 

Potential Divider

Supply Voltage V

Resistor 1 Ω

Resistor 2 Ω

Output Voltage V

 

Inductive Reactance

Frequency kHz

Inductance mH

XL Ω

 

Capacitive Reactance

Frequency kHz

Capacitance uF

XC Ω

 

Parallel Plate Capacitor

Overlap Plate Area mm²

Dielectric Thickness mm

Dielectric Constant

Capacitance uF

 

MOSFET gate resistor calculator - minimum

Gate charge C

Rise time s

Gate drive voltage V

Resistor Ω

 

Flux Density

Cross-sectional Area mm²

Flux Wb

Density T

 

Inductance

Number of Turns

Flux µWb

Current A

Inductance µH

 

Inductance

Number of Turns

Reluctance S

Inductance µH

 

Reluctance

Mean Length Flux Path mm

Permeability

Cross-sectional Area mm²

Reluctance

 

Reluctance - Toroid

Outside Diameter mm

Inside Diameter mm

Height mm

Permeability

Reluctance

 

Inductor - Turns

Outside Diameter mm

Inside Diameter mm

Field Density T

Permeability

Current A

Number of Turns

 

Transformer Turns - Sine Wave

Input Voltage Vrms

Output Voltage Vrms

Max Field Density T

Frequency kHz

Core Cross-section mm²

Permeability

Flux Mean Path mm

Primary Turns

Secondary Turns

No-Load Current A

 

Transformer Turns - Square Wave

Input Voltage Vp

Output Voltage Vp

Duty Cycle %

Max Field Density T

Frequency kHz

Core Cross-section mm²

Permeability

Flux Mean Path mm

Primary Turns

Secondary Turns

 

AWG Calculator - DC

Input Voltage V

Output Voltage V

Length m

Current A

AWG

Diameter mm

Power Dissipated W

 

Skin Depth

Frequency kHz

Skin Depth mm

 

 

Mechanical

Tube Internal Burst Pressure - Barlows - Metric

Outside Diameter mm

Wall Thickness mm

Material Yield Pressure MPa

Burst Pressure bar

 

Tube Internal Burst Pressure - Barlow's - Imperial

Outside Diameter inches

Wall Thickness inches

Material Yield Pressure Psi

Burst Pressure Psi

 

Tube Internal Burst Pressure - Barlow's - Useful Hybrid

Outside Diameter mm

Wall Thickness mm

Material Yield Pressure Psi

Burst Pressure Psi

 

Internal Burst Pressure - Variation 2 - Imperial

Outside Diameter inches

Inside Diameter inches

Material Yield Pressure Psi

Burst Pressure Psi

 

Internal Burst Pressure - Variation 2 - Metric

Outside Diameter mm

Inside Diameter mm

Material Yield Pressure Mpa

Burst Pressure Bar

 

 

Ballistics

Grains Grams

Grams Grains

 

m/s fps

fps m/s

 

Power - ft/lb Energy J

Energy - J Power ft/lb

 

Velocity - ft/s Weight - Grains Power ft/lb

Power - ft/lb Weight - grains Velocity ft/s

Power - ft/lb Velocity - ft/s Weight Grains

 

Velocity - m/s Weight - Grams Power Joules

Power - Joules Weight - Grams Velocity m/s

Power - Joules Velocity - m/s Weight Grams

 

Sectional Density - Imperial - lb/in²

Outside Diameter inches

Weight grain

Sectional Density lb/in²

 

Sectional Density - Metric - g/mm²

Outside Diameter mm

Weight gram

Sectional Density mm/g²

 

 

 

Pressure - conversion

Psi Bar

Psi Pascal

Psi inHg

Bar Psi

Bar Pascal

Bar inHg

Pascal Psi

Pascal Bar

inHg Psi

inHg Bar

 

 

Mathematical + Physics

Trigonometry - Sine Rule

Side - a

Angle - A degree

Angle - B degree

Side - b

Side - a

Angle - A degree

Side - b

Angle - B degree

 

Trigonometry - Cosine Rule

Side - a

Side - b

Side - c

Angle - C degree

Side - a

Side - b

Angle - C degree

Side - c

 

°C to K

C Kelvin

 

K to °C

Kelvin C

 

Velocity of Sound in Gas - Dry

Temperature K

Gas Constant J kg‾¹ K‾¹

Heat capacity ratio       (monoatomic - 1.67, diatomic - 1.4)

Velocity m/s

For air at 20°C (293.15 Kelvin) the gas constant is 287.058 J kg‾¹ K‾¹ and the heat capacity ratio is about 1.4 as it's mostly diatomic, which from the calculator should give a velocity of 343.2 m/s

 

Air Density

Absolute Pressure Bar         (1.01325 bar at 0 altitude)

Absolute Temperature °C

Gas Constant J kg‾¹ K‾¹         (Dry air 287.058 J kg‾¹ K‾¹)

Air Density kg/m³

 

Humid Air Density - not complete

Partial Pressure Dry Air Bar

Pressure Water Vapour Bar

Gas Constant J kg‾¹ K‾¹                   (Dry air 287.058 J kg‾¹ K‾¹)

Gas Constant Vapour J kg‾¹ K‾¹       (Water Vapour 461.495 J kg‾¹ K‾¹)

Temperature °C

Humidity %

Absolute Pressure Bar             (1.01325 bar at 0 altitude)

Air Density kg/m³

 

 

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