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Interesting read about combustion patterns for those who might be interested in making more hp/tq per ci
Combustion Patterns - How to Read Residue Patterns to Determine Combustion Efficiency - Circle Track Magazine
"Now, back to the issue of whether or not all this might work. Well, several years ago during a visit to the shop of Dennis Wells (Wells Racing Engines), we talked about much of what you have just read. In the span of just a few months after we visited, he poured through numerous dyno sheets and inspected used parts, particularly heads and pistons, becoming convinced that some of the engines he'd built were experiencing combustion efficiency problems.
His first attempt applying what had been discussed was directed to the combustion chambers and pistons he'd been using in his house Sprint Car engine (asphalt Silver Crown series). And even though this was an engine he has previously "optimized" for an entire racing season, the changes netted an increase in power and improved combustion efficiency by producing lower brake specific fuel numbers. He was convinced.
So although conventional wisdom may suggest that reading combustion patterns is not a viable tool, experience has pointed to the benefits from what the patterns can reveal. Time spent matching specific engine characteristics with the residue left on combustion surfaces can be a valuable addition to just about any engine builder's skill set."
Combustion Patterns - How to Read Residue Patterns to Determine Combustion Efficiency - Circle Track Magazine
"Now, back to the issue of whether or not all this might work. Well, several years ago during a visit to the shop of Dennis Wells (Wells Racing Engines), we talked about much of what you have just read. In the span of just a few months after we visited, he poured through numerous dyno sheets and inspected used parts, particularly heads and pistons, becoming convinced that some of the engines he'd built were experiencing combustion efficiency problems.
His first attempt applying what had been discussed was directed to the combustion chambers and pistons he'd been using in his house Sprint Car engine (asphalt Silver Crown series). And even though this was an engine he has previously "optimized" for an entire racing season, the changes netted an increase in power and improved combustion efficiency by producing lower brake specific fuel numbers. He was convinced.
So although conventional wisdom may suggest that reading combustion patterns is not a viable tool, experience has pointed to the benefits from what the patterns can reveal. Time spent matching specific engine characteristics with the residue left on combustion surfaces can be a valuable addition to just about any engine builder's skill set."
