I can't answer . . . those questions are beyond the tech knowledge of the project manager. asking fixed or varible orifice got me silence over the phone. If I get back to shop and have some time with techs, I hope to get answers then.
during a "heart to heart" with Owner a few months back, he stated few clients have knowlede of their car and the others just wanted X brand car. so this why I can't get alone with project managers