Hi Rob, Thanks much for the plug data. The pressure calibration I am referring to is for the two Shrader type valves in the injector assembly, which of course is on the high pressure side of the control pump. They are set at different operating points but are otherwise identical. The data on the site for cleaning does not mention this, so one must be careful not to interchange or disassemble them in cleaning. I would like to know what the proper calibration should be, if that is available. Having been involved in "continuous ink jet" research for nearly forty years, I am probably overly concerned on this, but can see obvious parallels in "tuning" this unique fuel injection application. Regards, Ken Stephenson ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm