General Category > Quadrajet Carb Talk and Tips
Adjustable idle air
Pav8427:
I realize there are best practice proven ways to make our quads work. Just thinkin outside the box. Over time if someone didnt do that once and awhile we may all still be runnin six strombergson on a log manifold on our 265's. Or in more modern times, that 454 quad should make my 305 run 11's and I wont have to use NOS. Just wonder if it had been thought of. Tried. Would it work in theory. Too much work for results. Blah. Blah. Blah.
Thanks.
omaha:
Let's not forget the air cooled bugs with the solex. Pict - 34 I believe. ALL THE air went through the adjustable air valve. I think it would be fairly easy to do. Especially. If the air did not need to go through the carb itself. I'm thinking a vacuum port near the base of the carb would work. You would need a source of filtered air [tap into the air cleaner would work, then a valve of some sort which would go into the intake just below the carb]. I would think it should work.
Pav8427:
If you were retaining hot air choke could you open up vacuum port to obtain some/more bypass air?
Even if converting to electric, could you leave port open and add adjustable idle air bypass to choke housing? Technicaly you could add more bypass without removing carb.
qjetsrule:
there are many ways to incorporate an adjustable idle air bypass, of course now that adds another adjusting screw. so now there are 4 screws to dial in the idle. this might confuse the average mechanic especially if an idle issue is caused by something else. I personally would like to have adjustable bypass air. Holley did it a little differently on some carbs, fixed idle fuel restriction and adjustable bypass air using the mixture screws.
Pav8427:
Heres a mock up on a not so pretty carb. My thoughts would be that you set up the carb with some bypass. Like .06-.08, convert to electric choke and leave vacuum port open(maybe have to open up some. Add this valve and you should be able to add more bypass just by cracking it open. These are made by SMC and are less than 5.00 online. If someone is interested in trying these, there are a few different styles. They make meter out, meter in, and needle valve(air flow both ways). Meter in or needle valve style is what you would want to use. I have to check with my air control guy and see if meter in style will allow the small amount of vacuum needed. This one has 1/8 NPT, but you can get them from #10 all the way up to big. (1/2NPT)
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