Ring Gap Calculator


About Ring Gap Calculator (Formula)

A ring gap is a distance between the two ends of a piston ring in an internal combustion engine. The ring gap is an important factor in the proper functioning of an engine, as it allows for thermal expansion of the piston rings and prevents them from seizing in the cylinder.

The formula for calculating the ring gap is:

RG = BS * 0.004


  • RG is the ring gap (in inches)
  • BS is the bore size (in inches)

This formula is based on the assumption that the ring gap should be 0.004 inches per inch of bore size. This value is often used as a starting point for setting the ring gap, but it can vary depending on the specific engine and application.

Factors such as the operating temperature and the type of fuel used can affect the ideal ring gap, and in some cases, the manufacturer’s specifications may call for a different value.

It’s important to note that the ring gap is a critical dimension for the engine to operate correctly. If the gap is too small, the rings will bind and the engine will not run.

If the gap is too large, the compression will be lost and the engine will not develop full power.

It’s also important to note that the ring gap should be measured and set for each cylinder and for each ring individually.

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