I found the formula for tuning the PVCR's. Take the stock jet diamter and the stock PVCR diameter, (2) each = 4: 3.1415 x jet x pvcr /4 = total area Then take your new jet size x new pvcr until the new combo equals the area of the original combo. Ref: 3.1415 x .068" original jet, .058" original pvcr = 003" Ref: 3.1415 x .058" new jet, .069" new pvcr = .003"
I need to get me some more drill bits.
Using the new smaller main jet will allow me to lean out the primary A/F ratio (currently at 14.4) at the 3500-4000rpms range. Then by using the corrected pvcr's (larger) will allow me to tune the A/F of the fuel delivered by the pv to get me back into the 14 range (currently 16+). Then I will need to rejet my secondaries to get my WOT corrected to the 12.8/13.0 range.
Last edited by YO7_A66; 09/12/1109:08 AM.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)