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Racing and Car Calculators!
| Cubic Inch Calculator |
| Bore x Bore x Stroke x .7854 x number of cylinders |
| eg. A 4.50" bore with a 4.25" stroke 8 cylinder |
| would have a displacement of 540 cubic inch. |
| Weights |
| Oil - 1 Gallon = 8.75lbs. |
| Gas - 1 Gallon = 7.75lbs. |
| Water - 1 Gallon = 10.50lbs. |
| Cruise RPM Formula |
| MPH x Axle Ratio x 336 |
| Tire Diameter |
| eg. A car with an axle ratio of |
| 4.56:1 and a 28" tall tire would |
| rev 3283rpm at 60mph. |
| Carburetor CFM Calculator |
| Maximum RPM x Engine CID |
| 3456 |
| eg. A 454 cubic inch engine that |
| has a maximum RPM of 6500 |
| would require an 850cfm carb. |
| Measurements |
| 1 km = 3,280.83 ft or .6215 mile |
| 1 cm = .3937 inches |
| 1 kg = 2.2045855 lbs |
| 1 mile = 1.609 km |
| 1 inch = 2.54cm |
| 1 lb = .4536 kg |
| Connecting Rod Ratio |
| Rod Length |
| Crank Stroke |
| eg. A 5.70" rod with a 3.75" |
| stroke has a Rod Ratio of 1.52 |
| Injector Size Calculator |
| |
| Injector Flow Rate (lb/hr) = |
Engine HP x BSFC |
| |
# Injectors x 0.8 |
| (BSFC is typically 0.4 - 0.6)(use 0.5 as an estimate) |
| eg. A 500HP 8 cylinder (using a BSFC of 0.5) would |
| require a 39 lb/hr injector. |
| Injector HP Rating |
| Engine HP = |
Injector Size x # Injectors x 0.8 |
| |
BSFC |
| eg. A 72 lb/hr injector in an 8 cylinder would support about 920HP. |
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