This compression ratio reference table shows the compression ratio (to 1) for a range of cylinder (swept) volume values, assuming a clearance volume of 50 cc. Every figure is computed with the same engine that powers our Compression Ratio Calculator, so the numbers are exact.
| Cylinder (swept) volume | Compression ratio (to 1) |
|---|---|
| 130 cc | 3.60 |
| 250 cc | 6.00 |
| 380 cc | 8.60 |
| 500 cc | 11.00 |
| 750 cc | 16.00 |
| 1,000 cc | 21.00 |
| 1,500 cc | 31.00 |
| 2,500 cc | 51.00 |
| 3,500 cc | 71.00 |
| 5,000 cc | 101.00 |
How to use this table
Find the row closest to your cylinder (swept) volume and read across to the compression ratio (to 1). For a value between two rows, the real figure sits between them — or enter your exact numbers in the Compression Ratio Calculator for a precise answer.
Need a value that is not in the table? — the Compression Ratio Calculator does it instantly, for free, with the formula and a worked example built in.
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