The compression height calculator is used to find the distance from the pinhole to the deck of the piston. Our calculator will figure out the person compression height using your input.

## What Is Piston Compression Height?

**Height compression is the distance from the center line of the pin to the top of the piston. **

It is also referred to as the piston compression distance or piston pin height.

## Compression Height Formula:

Piston compression height is generally used in automobiles to describe the distance between pins and the piston. The compression height calculator uses the following formula to compute the compression height distance.

Compression Height = BH - (½) CS - RL - DC

CH = BH − 0.5 ∗ CS − RL − DC

**Where:**

- CH = compression height
- BH = block height
- CS = crank stroke
- RL = rod length
- DC = deck clearance

## How To Evaluate Piston Compression Distance?

With the help of our online person height compression calculator, you can compute any value from the formula by putting the other known variables.

### Example:

Suppose that a block with 7 inches in height, the crack stone is 4 inches long, the length of the rod engine is 1 inch, and the deck clearance is 2 inches. So calculate their piston compression distance.

#### Solution:

As we already know the height compression person formula to calculate the height compression:

CH = BH − 0.5 ∗ CS − RL − DC

CH = 7 - 0.5 * 4 - 1 - 2

CH = 2 inches

CH = 0.0508 meter

Hence, we calculate that the piston compression distance is 2 inches or 0.0508 meters.

## Working Of Compression Height Calculator:

The precise height compression enhances the efficiency of the engine at a high speed. To determine the compression following points are considered to be important.

**Input:**

- Enter the block height
- Put the crank stroke
- Put the rod length
- Put the deck clearance
- Tap “calculate”

**Output: **

Our height compression calculator will evaluate and display the following results:

- Compression height
- Complete guide in steps

## Compression Piston Size:

To determine the size of the compression height person following factors are considered to be important.

- Block height
- Connecting rod length
- Stroke length

### Block Height:

Block height is the distance between the centreline of the main bore to the flat surface where the head bolt is on.

Displacement Cubic Inches |
Liters |
Deck Height (inches) |

302 | 4.9 | 9.025 |

305 | 5.0 | 9.025 |

327 | 5.4 | 9.025 |

350 | 5.7 | 9.025 |

350(LT5) | 5.7 | 9.025 |

350(LS1) | 5.7 | 9.240 |

364(LQ4) | 6.0 | 9.240 |

383 | 6.3 | 9.025 |

400 | 6.6 | 9.025 |

396 | 6.5 | 9.800 |

402 | 6.6 | 9.800 |

427 | 7.0 | 9.800 |

454 | 7.4 | 9.800 |

502 | 8.2 | 9.800 |

### Connecting Rod Length:

The distance between the little and the big pin bores. A shorter rod will increase the speed. Longer rods increase the side load on the piston which causes to decrease in friction.

Displacement Cubic Inches |
Liters |
Big End Dia. (inches) |
Rod Length (inches) |

302 | 4.9 | 2.1000 | 5.7000 |

305 | 5.0 | 2.1000 | 5.7000 |

327 | 5.4 | 2.1000 | 5.7000 |

350 | 5.7 | 2.1000 | 5.7000 |

350(LT5) | 5.7 | 2.1000 | 5.7400 |

350(LS1) | 5.7 | 2.2500 | 6.0980 |

383 | 6.3 | 2.1000 | 6.0000 |

400 | 6.6 | 2.1000 | 5.5650 |

396 | 6.5 | 2.2000 | 6.1350 |

402 | 6.6 | 2.2000 | 6.1350 |

427 | 7.0 | 2.2000 | 6.1350 |

454 | 7.4 | 2.2000 | 6.1350 |

502 | 8.2 | 2.2000 | 6.1350 |

### Stroke Length:

The distance covered by the piston during each cycle is called stroke length.

Displacement Cubic Inches |
Liters |
Bore (inches) |
Stroke (inches) |

302 | 4.9 | 4.000 | 3.000 |

305 | 5.0 | 3.740 | 3.480 |

327 | 5.4 | 4.000 | 3.250 |

350 | 5.7 | 4.000 | 3.480 |

350(LT5) | 5.7 | 3.898 | 3.661 |

350(LS1) | 5.7 | 3.898 | 3.622 |

364(LQ4) | 6.0 | 4.000 | 3.622 |

383 | 6.3 | 4.000 | 3.800 |

400 | 6.6 | 4.125 | 3.750 |

396 | 6.5 | 4.094 | 3.766 |

402 | 6.6 | 4.125 | 3.766 |

427 | 7.0 | 4.250 | 3.766 |

454 | 7.4 | 4.250 | 4.000 |

502 | 8.2 | 4.470 | 4.000 |

## FAQs:

### What Determines The Compression Stroke?

The stroke ratio determines the compression stroke. It is the ratio between the diameter of the cylinder bore and the piston stroke length.

### How Does Connecting Rod Length Affect Engine Efficiency?

With the long connecting rods use the lighter piston. It helps the engine to move freely but on the other side, the shorter compression height can interface with the oil rings. Because of this reason, the ring is less stable inside the cylinder.

### What Are The Advantages Of High Compression Height?

Higher compression height is useful for a larger amount of fuel and it enables the engine to extract more mechanical energy that can generate more power due to the larger compression height piston.

## References:

From the source Wikipedia: Height compression human, Compression ratio, Variable compression ratio engines, Mathematical formula.