Free Horsepower Calculator Compression Ratio Calculator Race Math Formulas and Racing Math Resources
High Performance starts with math, precise measurements and calculations.
We are pleased to share these helpful tools with our valued customers and guests. Please feel free to use these tools, bookmark this page for future use, and post links to this page for others to use. A big part of building high performance engines, racing engines and vehicles involves math, numerous formulas, calculations and precise measuring of components to provide the absolute best performance possible. We hope you will find this page helpful. If there is other information you would like to see here please contact us and we will do our best to add the resources you suggest.
Helpful Racing Math Resources Engine Design and Blueprinting Books and More
Free Horsepower Calculator
Engine Rear Wheel Horsepower Calculator Based on total vehicle weight and 1/4 mile MPH
To use this horsepower calculator enter the mph trap speed at the 1/4 mile mark from one of your dragstrip ET slips. Then enter the total weight of your vehicle, as raced, including the drives weight. The best way to get the weight is to weigh your vehicle at the track with the driver seated in racing position. Then click the calculate button and rear wheel horsepower will be displayed. To run another calculation just click the clear button and start over.
Use this compression calculator tool to figure the compression you will get with the specifications you provide. You can change the head ccs, deck height, overbore size, etc. to see the affects on compression. This tool is a very accurate tool and can be tremendously helpful.
If you have the actual displacement in ccs of the exact head gasket you are using, you can get an even more accurate compression calculation by using those figures. To enter head gasket displacement volume, in the "Gasket Thickness" field enter ".0001". Then combine the gasket displacement ccs with the "Head" ccs. For instance, if you have a 64cc chamber and a head gasket displacement of 9.2 ccs, then in the "Head" ccs field enter "73.2".
This tool can also be used to find the final engine size based on any bore size, crankshaft stroke and number of cylinders. You can use this for example to see how big your stroker engine will actually be as far as displacement, based on different bore sizes or crank strokes. This tool is very accurate for displacement calculations. When using the tool for engine size calculations only you can put most any reasonable numbers in the fields that are used to calculate compression ratio, but you must put something in all fields for the tool to work. The 3 critical dimensions for displacement calculations are bore, stroke and number of cylinders.
Precision Measurement Tools
Building any engine requires a selection of precision measurement tools. When building a high performance engine, racing engine or blueprinting an engine, the quality of your measuring tools becomes even more important. Remember, these tools perform some of the most critical functions of your engine building process. Quality tools are an investment that will last a lifetime if properly cared for. Here is a selection of tools we hope you find helpful. We have found Amazon to be a great supplier and often you can find good used tools there also if you do not want to buy new.
Race Math Engine Math Racing Math Formulas and Conversion Info
GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87
X (Head Gasket Thickness in Inches)
DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87
X (Inches Below the Deck)
HV (Head Volume) = CC's
VV (Dish, Valve Pocket, Dome Volume) = CC's
(Minus for dish or valve pockets, Plus for dome)
PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87
Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)
Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854
Convert Cubic Inches to CCs = Cubic Inches X 16.386
Convert Cubic Inches to Liters = Cubic Inches X .016386
Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / (16386 X 1000)
Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / 16386
Convert CCs to Cubic Inches = CCs / 16.386
Convert Liters to Cubic Inches = Liters / .016386
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