Good point. I have read the high boost guys with high end dynos actually measure SCFM. Ultimately though when it comes to problem I think it is fair to say that PSI is what will cause things like seals and gaskets to leak and worse fail. I've seen quite a few charts that show the SCFM and PSI per hose diameter unfortunately most charts are geared towards high pressure. I have not found one with good specs on lower pressre (i.e. 0.5 - 3.0 psi) as it relates to say 0.125" - 0.50" hose size.) If you find one please post. Same with an easy way to measure, say, 0.2" to 2.0" scfm. Other than to extapolate the SCFM with known credible PSI and Hose I.D. numbers.
EDIT: I forgot to mention the manometer is a good idea. I think I detected some suction on low RPM. So the current home man manometer will have to be redesigned. And dang, allowing for suction and up to say 30In is one tall manometer! I just need more time to do all of this.
Aside from this, I have to admit pushing this set up in to boost is on the edge. Last time I crept up to 4500 rpm at 40" MAP I actually felt it starting to lift and get really light on the right gear. Needless to say I quickly reduced the power. Without wings on the fuse, it is just not stable enough in the roll axis to push it very hard. So higher MAP crank case pressure testing may have to wait until the wings are on it.
Last edited by charosenz : 11-23-2019 at 04:30 PM.