What Variables Influence Internal Combustion Engine Performance?

AI Thread Summary
Numerous variables influence the performance of internal combustion engines, including volumetric efficiency, piston ring sealing, and ambient conditions such as temperature and humidity. Other critical factors include exhaust tuning, valve and spark timing, and combustion chamber cleanliness. Each variable can significantly impact engine performance and must be considered individually. The complexity of these factors makes it challenging to provide a comprehensive overview. A more specific inquiry could yield better-targeted insights.
Abdul Rahim
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What are the variables that influence the performance of an internal combustion engine?
 
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Welcome to PF, Abdul.
There are dozens of them. Volumetric efficiency, piston ring sealing efficiency, ambient temperature, fuel temperature, intake air temperature, humidity, exhaust tuning, valve and spark timing, plug condition, combustion chamber shape and cleanliness (ie: carbon build-up), port matching, atmospheric pressure, bearing friction, windage drag...
Really, it's too extensive a list to make any sense. Each issue has to be addressed individually.
 
Indeed. Fred's list is good, but is still only about a tenth of all the variables.

Can you be more specific with your question?
 

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