Engine efficiency is increased though compression ratio by allowing a more thermodynamic energy to be converted into mechanical energy. Energy transfer is the key to efficiency.
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Combining a 4A block with a 5A cylinder head may result in a mismatch between the cylinder head and the block, potentially leading to issues such as poor sealing, compression ratio discrepancies, and improper fitment of components like valves and spark plugs. Additionally, variations in combustion chamber design and valve sizes between the two components could affect engine performance and efficiency. It is crucial to ensure compatibility and proper machining to avoid potential damage or inefficiencies in the engine.
between 18 and 25 to one depending on engine I agree. It all depends on what engine you have.
The compression ratio doesn't deal with the displacement, the bore and stroke do. If it's a modern engine it should say the size of the engine in liters. You can use this to convert the engine size to cubic inches. A 173ci engine is a 2.8L engine when converted.
There are several means by which the compression ratio of an engine might be reduced although all involve extensive mechanical rework to accomplish. 1) Remove the heads from the motors and grind the compression chambers of the head(s) to make the area larger. 2) Install replacement pistons that have a different shaped piston top (usually a larger "dished" area)
The fuel efficiency of an engine will depend on the car itself, amongst other factors.