: 11.0–11.5:1 (Naturally Aspirated) or 9.1:1 (Turbocharged).
The R06A is a diesel engine produced by MAN, a German-based multinational company. After some searching, I was able to find a few sources that might provide you with the manual you're looking for: r06a engine manual pdf
: If free versions are unavailable, professional-grade PDFs covering the R06A (often listed under the Suzuki Alto 2011+ or Wagon R) are available for purchase at WorkshopManuals.org or eManuals . 📊 R06A Engine Specifications r06a engine manual pdf