What is the compression ratio of the D16?
There isn't a single compression ratio for the D16 engine family; it varies by variant and year.
Understanding the D16 family
The D16 designation covers Honda's 1.6-liter D-series engines used in Civics, Integras, and other models. There are DOHC and SOHC variants, with and without VTEC, tuned for different markets and applications. Because each variant is optimized for different performance targets, the compression ratio is not uniform across the range.
Determining the exact compression ratio for your engine
To determine the exact compression ratio for your D16 engine, identify the specific variant and reference official specifications. The steps below will guide you to the precise figure:
- Find the engine code stamped on the engine block or cylinder head (examples: D16Z6, D16Y8, D16A6, etc.). The code identifies the variant.
- Use Honda's service data, factory manuals, or reputable automotive databases to look up the compression ratio for that exact engine code and year.
- Consider the market and year, as some variants had slightly different specs between regions.
- If you can't locate a reliable source, contact a dealership or certified mechanic with the vehicle's VIN to retrieve the OEM specification.
With the engine code in hand, you can verify the exact compression ratio from official sources or trusted manuals.
Common ranges for reference
In general, D16 engines tend to fall within roughly 9.0:1 to 10.5:1, depending on DOHC vs SOHC configuration and VTEC status, as well as regional variations. This range is intended as guidance; always confirm the exact figure for your specific variant.
Summary
The D16 designation covers multiple 1.6-liter Honda engines with varying compression ratios. There is no single value; to know yours, identify the exact engine variant and consult OEM specifications or a trusted database. If you share the exact engine code or vehicle details, I can provide the precise compression ratio for that variant.
