Carter Thermoquads ~ 'More General Information'

4bbl.
Some comments. Thanks for the info.
- Do not necessarily agree that larger air bleeds that create more emulsion is bad.
Weber carbs have large air bleeds [ air corrector jet ] & make big HP for their size. Atomised fuel burns more efficiently & makes more HP.
- The QJ primary system is different to the TQ, location of air bleeds & number of bleeds, so comparing jet sizing probably doesn't tell us much.
- The only time I have had a TQ bog on the secondaries was when the sec jets were too small; or the AV too loose [ I set at 2 turns ]; or the dashpot was faulty. I also set the AV for 0.050 -0.100" of movement [ kick ] with the dashpot retracted at idle. This initial kick just lets in a more air for the secs to 'grab' & help response.
- The TQ is a brilliantly engineered & sophisticated carb; a lot of thought went into the design & not cheap to make. Better than the POS Holley [ & clones ] & no surprise H copied it, albeit a cheaper version, with the Street Demon.
- The TQ has adjustability for the AV fully open position, something the QJ does not have, making it more versatile when tuning. The sec WOT position is also easier to change than the QJ & the linkage action is more positive.
- I remove all the choke/fast idle linkage mechanism. This leaves holes in the a/horn, which I plug. It also leaves a small opening in the AV. I braze a small piece of steel over this. Without blocking that hole [ which is normally blocked by the choke linkage ] it might cause a lean/bog condition.
- I have enlarged the economizer on a few occasions; also called the Idle Down Channel. There are two body screws roughly inline with the mixture screws, Near each is an alum plug in the a/horn. These can be prised out with a sharp knife. About 35mm in from the front surface is a brass insert. This is the economizer jet. I found they vary from about 048-052", stock. For a big cammed engine, I enlarge them about 0.004".