With all the salt and sand on the roads over here I wont be taking the car out for a while so I tested the fuel air ratio with the air cleaner on and then off in the garage. I made two runs with the air cleaner in place then four with it off then two more with the air cleaner on again. I took it up to 6,000 rpm and let it stabilize each time. There was no more than 1/10 of a point difference between all eight pulls. Pretty much the same for the cleaner off as with the cleaner on. I don't know how much if any the secondaries were open but I'm sure it's drawing enough air in at 6,000 rpm to use the test results.
