Quote: School me on what IFR's are? ,and why should I wire them down? In your earlier post, you mentioned PVCR's also? Power Valve Circuit something? Still learning these acronyms. Thanks, Jay
You dont have to wire them down as DaveRS23 explained what you do is insert a piece of wire a certain size in the IFR (Idle Fuel Restricter) which takes up space and lets less fuel get through that circuit and leans out the idle. Its an old trick Bill Jenkins use to do back in the 60's and 70's and it works. All the newer cars already have jets in the IFR and the PVCR and on the newer carbs all you have to do is change the jets. In fact most newer carbs have jets in the ildle air bleed and high speed air bleed circuits also for easy tunning. Ron
You are right that you do not have to wire them down. You can buy a hand full of numbered jets or blanks and wire drill bits.
In your earlier post, you mentioned PVCR's also? Power Valve Circuit something? Still learning these acronyms. Thanks, Jay 