Richard B Rothrock wrote:

Hi Paul,

I understand the 13b cycles.  It is that cavern I don't get.
Maybe the enclosed picture will help what I am looking at.

I think it is a reflection from the highly polished end housing.

Paul Lamar

"Quirk, Kevin KA" wrote:

Paul,

Is it the secondary port (RENISIS is a 6-port engine)  that Richard is talking about?
This port would be opened late in the rev range for the airflow required @8500-9000RPM.

Kevin Q.

 
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