Is a Cylinder Pressure of 7 Normal for a Car?
2 Answers
An engine cylinder pressure of 7 is within the normal range. Below is a brief introduction about automobiles: 1. Definition of Automobile: According to China's latest national standard "Terms and Definitions of Motor Vehicles and Trailers" (GB/T-3730.1-2001), an automobile is defined as a non-track vehicle powered by an engine with four or more wheels, primarily used for transporting passengers and/or goods, towing vehicles carrying passengers and/or goods, or for special purposes. 2. Automobile Tariffs: Starting from July 1, 2018, China reduced import tariffs on complete vehicles and auto parts.
As someone who frequently tinkers with cars, I believe that a cylinder pressure of 7 bar is definitely not normal. The normal cylinder pressure for most car engines is between 9 and 15 bar, so 7 bar is on the low side, indicating a compression issue in the cylinder. This could be caused by worn piston rings or poor valve sealing. Once the piston rings are worn, they can no longer effectively seal the air inside the cylinder, leading to a drop in compression pressure and affecting the engine's power output. When driving, you might notice slower acceleration, increased fuel consumption, or even difficulty starting the engine when cold. Ignoring this issue for a long time will accelerate engine wear and lead to higher repair costs. I recommend going to a professional repair shop immediately for an inspection. They can use a compression tester to measure the pressure in each cylinder. If one cylinder is significantly lower, they can determine which specific component is faulty. Remember, don’t try to fix it yourself—mistakes could cause bigger problems. Also, regular maintenance like changing the oil and air filter can help prevent similar issues. Overall, insufficient cylinder pressure affects both driving safety and performance, so addressing it early will give you peace of mind.
