Calculate Stroke Size 

Speedmaster Tools

Engine / Performance

• - Bore Size & Bore/Stroke Ratio
• - Carburetor Size Needed
• - Engine Size
• - Engine's Compression Ratio
• - Fuel Injector Flow from change in Fuel Pressure
• - HorsePower from Intake Airflow
• - Horsepower gain from adding Blower Pressure
• - Intake Airflow from Horsepower
• - Rod Stroke Ratio
• - Stroke Size

Rear Gear Requirements

• - Rear End Gear Ratio Needed
• - Speed from RPM, Rear & Trans. Gear Ratios
• - RPM from Speed, Rear & Trans. Gear Ratios

Drag Strip Performance

• - 1/8 Mile Horsepower Requirements from MPH
• - 1/8 Mile Horsepower Requirements from ET
• - 1/8 Mile ET from MPH
• - MPH - Km/H in 1/4 Mile using Horsepower
• - 1/4 Mile Horsepower Requirements from MPH
• - 1/4 Mile Horsepower Requirements from ET
• - 1/4 Mile ET from Horsepower
• - 1/4 Mile ET from MPH
• - MPH from 60 foot time