![]() Volume (CCs) of Deck ClearanceĬCs of Deck Clearance = Bore x Bore x 12.87 x Depth of Deck Clearance Volume (CCs) of Head GasketĬCs of Head Gasket = Bore x Bore x 12. Note: You can also save this link to a handy Gear Ratio calculator. A piston above deck subtracts from chamber volume, and below deck adds to chamber volume. The positive or negative value must be reversed when this number is used to calculate compresion ratio. General rule of thumb for acceptable dynamic compression ratio to run safely on pump gas is 8:1 maximum for engines with cast iron cylinder heads and 8.5:1 with. Rear Gear Ratio = (RPM at Finish Line x Tire Diameter) ÷ (MPH x 336) Piston Compression Height: Deck Height (Crank C/L Deck) Deck Clearance: Note: This only refers to the piston being above or below deck. Rod Ratio = Rod Length ÷ Crank Stroke Length Average Piston SpeedĪverage Piston Speed = Crank Stroke x RPM ÷ 6 Rear Gear Ratio Remember, this is one of those equations that work for some cases and leave you scratching your head for others. Horsepower = (RPM x Torque) ÷ 5,252 Torque This is simple determination of rough engine horsepower output based on a 'mean' cylinder compression ratio. Gross Valve Lift = Camshaft Lobe Lift x Rocker Arm Ratio Horsepower Engine displacement is determined by calculating the engine cylinder bore area multiplied by the stroke of the crankshaft, and then multiplied by the number. Tire Diameter = (MPH x Gear Ratio x 336) ÷ RPM Rocker Arm Ratio and Valve Lift Drag Racing Calculators,Calculators to find 1/4 mile ET and MPH, CID,Piston Speed,gear ratio,carburetor size,margin of victory,Engine calculator, Calculates relative horsepower, air density, density altitude, virtual temperature, actual air pressure, vapor pressure and dyno correction factor and more. Note: You can also take this Compression Ratio Calculator tool for a spin. 7854 x Bore 2 x Stroke x Number of Cylinders Correct Compression Ratio (CCR) Note: Summit Racing also offers this CFM Calculator to make the job easier. Racing Carburetor CFM = RPM x Displacement ÷ 3456 x 1.1 (Quick-while your sixth grade teacher isn’t looking!) Racing Carburetor CFM ![]() Read it, print it out, and tape it to your beer fridge. That’s why we’ve put together this list of 13 key performance formulas you should know when building or tuning your street or race vehicle. We’ve got the right engine pistons for your application, including a massive variety of brands, applications, bore sizes, strokes, and top designs to help you achieve the right compression. While cheat sheets might have frowned upon in your sixth-grade classroom, we strongly encourage them in the garage, shop, or pits. In the automotive mechanics world, there are formulas and conversions for measuring just about everything-from horsepower and torque to carburetor cfm and gear ratio. How do you calculate compression ratio? What’s the best way to figure out engine displacement? Image/Pixabay ![]()
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