Height Compression

The height compression calculates the compression height which is the distance from the pinhole to the deck of the piston. Get accurate measurements in terms of inches and meters with this tool.

What Is Piston Compression Distance?

The piston height compression is the dimension or the distance from the flat top of the piston to the center of the piston pin. 

The piston compression distance is also referred to as the piston pin height to avoid confusion. The piston compression distance is adjusted relative to the required efficiency of the engine. The precise person compression height increases the efficiency of the engine at a high speed.

How to Determine Compression Height?

The compression height is the distance between the center of the wrist pin to the crown of the piston.

For calculating the piston compression height, use the following formula:

Piston compression height =BH-(½)CS-RL-DC

Or 

CH=BH−.5∗CS−RL−DC

Where:

• CH is the compression height
• BH is the block height
• CS is the crank stroke
• RL is the rod length
• DC is the deck clearance

Practical Example:

Let the block height is 6 inches, the crank stone is 3 inches long, the rod length of the engine be 1.5 inches and the deck clearance is 2 inches. Then calculate the piston compression distance.

Solution:

We know the compression height person’s formula

CH = BH – .5*CS – RL – DC

Insert the values in the above formula 

CH = 6- .5*3 – 1.5 – 2

Then 

CH = 1inch

CH = 0.0254 m

The piston compression distance is 1 inch or 0.0254 m.

Size of the Compression Piston:

There are three things you need to decide when deciding the size of the piston.

• The Block Height
• The Connecting Rod Length
• The Stroke Length

The Block Heights:

The block height is measured from the crankshaft to the centerline of the deck.

The Connecting Rod Lengths:

The Connecting rod length is measured between the centers of the big end and the little end.