Quote: Sorry .. I was in a hurry and I typed it wrong... but then I found that just multiplying the main jet and the pvcr gave me what I was looking for.
No apology needed..this way you know who is paying attention (and admitidly I only check in sporadicly) not sure about the multiplying, it's what AndyF wrote, its the areas that need to be compared. PI*r^2 but as Andy pointed out, its the square of the radius thats different.
Thanks for reposting the chart summary. That's really good.
Quote: The only time that I am seeing the 16+ A/F is during medium accel "only" when the vacuum falls under my pv rating. So when the pv is open is when I was seeing this 16+ on the A/F meter. This is why I am changing to the richer pvcr's.
So my question is this whether the lean surge also occurs above the PV opening vacuum?
It's normal for the AFR to get leaner as the throttle opens. This is fine as long as load on the engine is not too high. Somewhere around 80-90% load (depending on the engine design) it needs to be richer. The vacuum where each engine-drivetrain combo hits the load that requires enrichment can vary quite a bit. Maybe you'll have to go to a 10.5 PV.
However when the PV does open, the AFR should not get suddenly leaner if the carb is already on the mains (even partialy). Check the AFR at 12" and 10". If its already around 16:1 or higher, then 16:1 at 9.5"vac at least makes sense. If AFR is richer at 10 and 12"Hg than at 9", then something is not right.* If its continuing to get leaner below the PV opening vacuum then the PV is probably not opening when it should be.
*one possible but unlikely scenario is that the fuel level is below PV
(and admitidly I only check in sporadicly) 
