Result |
Formula |

Displacement |
**3.14 * R(squared) * S * C**
*Where as R = radius (1/2 diameter) of the bore; S =
Stroke; C = The number of cylinders*. |

Simpler formula for displacement |
**B * B * .7854 * S * C**
*Where B = Bore; S = Stroke; C = Number of cylinders.* |

Engine CFM |
**(engine RPM / 2) * (engine displacement / 1728)** |

Another CFM formula is |
**maximum engine RPM * (cubic inch displacement / 3456)** |

Compression Ratio |
**displacement of 1 cylinder / volume of 1 combustion
chamber** |

Volume |
**displacement of 1 cylinder / compression ratio** |

To convert cc's into cubic inches |
**Multiply by .061** |

Piston Speed
*Should be in the 4,000 to 4,500 per minute is about the
limit* |
**RPM * stroke / 6** |

Miles Per Hour |
**(RPM * T) / (R * 168)**
*Where T = 1/2 the tire diameter; R = Rear end ratio* |

Axle Ratio |
**Count the number of revolutions the driveshaft makes
to turn the tire once. If only one tire is jacked up, count for two
tire revolutions.** |