Ok, the speed of airflow @ Mach 1 is approx. 1116 feet per second at sea level that varies according to altitude, temperature,etc. as mentioned. But the maximum speed of air for making horsepower is around .6 Mach or approx. 650 feet per second due to friction within the ports and some other factors. After airflow reaches this 650 feet per second it starts to choke. When (@ what RPM) this speed of the airflow happens depends on the size of the engine vs. the area of the ports,valve diameter,TB, intercooler tubing,camshaft duration etc. One also has to look at how the engine is designed. An over square engine (bore larger than stroke) will be willing to make HP higher in the R's with the same area of the ports etc. than a under square engine (stroke larger than bore). The rod to stroke ratio also plays a big role when this 650 feet per second happens with a higher rod to stroke ratio (long rod) willing to make HP higher in the R's than a lower rod to stroke ratio engine (short rod) with the same available flow area. I think you may have choking of the air flow going on with some of your parts. Hope this helps!
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