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Those adapters work both ways, I have a couple of them. They will indeed allow a four barrel carb to work on a two barrel manifold. Perhaps it was poorly described in the Amazon page, but on their own site it mentions that:
Spectre's universal Carburetor Adapter is designed to adapt 4 barrel...
Some of the tools used to clean paint guns will also work on carbs.
www.amazon.com/DESIN-Carburetor-Cleaner-Airbrush-Cleaning/dp/B09V2W31LR/ref=sr_1_1_sspa?keywords=carburetor+jet+cleaner&qid=1704564218&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1
The nitrogen is a factor because it expands when heated up by the burning oxygen/fuel mix, helping force the piston down. Just like water, which doesn't burn, can increase thrust in a jet engine with water injection.
Oxygen is closer to 21%, nitrogen is 78% and the third gas is argon, at about 1%. The rest are, as you say, trace gasses. We're talking dry air, of course, since sometimes there is a lot of moisture in the air as well.
The size of the fuel bowl isn't a flaw, it didn't keep big block GM musclecars from completing quarter mile tests for the magazines back in the day. Of course, restrictions in the fuel lines should be avoided in any application, regardless of the carb used. If you need a large fuel bowl to act...
VE is still a useful measurement for showing the efficiency of the flow of an engine, so knowing that a 400 c.i. engine has an 80% VE, then you can figure on it being able to ingest 360 c.i. of air with every two rotations. Mass is also useful to know, but it changes with altitude, temperature...
One of the classic arguments over using larger carbs is that the standard speed shop formula (Cubic Inches x RPM x Volumetric Efficiency ÷ 3456) gives a smaller number than people had expected, and the larger carb seems to work out just fine. But that formula is flawed; it would theoretically...
That is partially correct. Both the AFB and AVS have vacuum controlled secondaries. The bottom throttle plates open right away upon full throttle on both types, but the secondary control air flaps are opened by air flow. The AVS flaps are kept closed by spring pressure, easily adjustable...
Have you made sure that the secondary air valve isn't opening too soon? You say the carb was rebuilt, did you do it or was it done by someone else? I wonder if the proper leather pump seal was used, some kits use neoprene.
Also, inspect the 'S' shaped linkage that connects the accelerator...
If your country is still measuring octane in RON, that would make a difference in numbers compared to the USA, Canada or Mexico. We use the RON/MON combination, listed as R+M/2, which is about 4 to 6 numbers lower than a RON rating. So if I go to a Chevron and buy our 94 octane, it would be...
Every engine is different. While it is often accepted that 16:1 - 16.5:1 is a good cruise mixture, and misfiring will start if you go leaner than 18:1, that can vary by things like compression or type of cam. For instance, a high overlap cam can allow increased exhaust residuals in the mix and...