My typing must be invisible. LOL.

SB, I read your response quoted from the website (which I already looked at). Thats like saying how does a car engine work...easy, you turn the key and it starts....haha. I was just wondering if someone knew what measurements it takes, like it measures how much air to pressurize the cylinder to a certain psi at TDC and then BDC and can then calculate the chamber volume somehow?

SB is correct, the vast majority of the Whistlers were utilized by sanctioning bodies (SCCA_NASCAR_APBA etc) for validation of CR in the field (competition events). In the shop environment stacking tolerances works equally well. See Katech spec sheet attached.

Bob