What is the compression ratio of the new Jetta?
2 Answers
The compression ratio of the new Jetta is 14.7:1. The compression ratio can indeed serve as one of the criteria for determining the fuel grade used in an engine. Engines with a compression ratio below 8 can use 90-octane gasoline, those below 9 can use 93-octane gasoline, and those above 9 should use 97-octane gasoline. Impact of compression ratio: The compression ratio affects the gasoline grade used in an engine because the air-fuel mixture generates heat during compression. The higher the pressure in the cylinder, the greater the heat and temperature. Reason why compression ratio affects fuel: Lower-octane gasoline has a lower ignition point than higher-octane gasoline and is more easily ignited. Therefore, engines with lower compression ratios use lower-octane gasoline, while those with higher compression ratios require higher-octane gasoline.
I previously drove the New Jetta, and the engine compression ratio is generally around 10:1, depending on whether you choose the 1.5L or 1.4T version. This is the standard level for gasoline engines. Simply put, the compression ratio indicates how much the air in the cylinder is compressed—the higher the ratio, the better the engine efficiency and fuel economy, but too high can lead to knocking issues. When driving this car in the city, I found the power delivery quite smooth, with fuel consumption around 6L per 100 km, making it very economical and practical. For daily use, I recommend using standard gasoline and avoiding low-octane fuel, as well as regularly checking the spark plugs and air filter to prevent carbon buildup from affecting compression. If it's the turbocharged model, the compression ratio might go up to 10.5:1, offering quicker acceleration, but it requires more frequent maintenance, with a minor check every 5,000 km to ensure engine longevity. Overall, the New Jetta's design is quite smart, balancing performance and everyday usability.
