Quote:
Originally Posted by Dissident
Easiest thing to do is calculate the square inches of area of the main secondary jet which is fixed (I use 0.135" diam = Area of 0.014313915 sq in) then subtract the area of the secondary metering rod tip so the difference is the functional area of the secondary jet with that metering rod. As an example, the guy that raced his SS in Atlanta said he used a 0.057" and a 0.066" tipped rod so that is a change of area of 30%.....wow. Normally one would want to change only about 5% or so at a time, but that is just a suggestion. Whatever works for you.
Best thing to do is to make a chart or table of whatever your metering rod tip selection is and do the arithmetic.
Regards to all that like this kind of stuff. 
Otherwise just put your mask on and change the channel to reruns. 
HB2 
Dissident |
I have been racing my car for many years so I know what it likes in certain air conditions and I set the carb according to that. I run the .066 rod when it is hot and humid. In Atlanta it was almost 90 degrees and the humidity was near 80% most of the weekend DA about 3500 ft. The first couple of passes I still had the cold weather set up in the carb. That was the .057 rods. I had that in from the Baby Gators just before the shut down. The DA there was below 1000 ft and the humidity was about 30%. I don't know anyone that runs rods richer than a .057 unless you are trying to air leak the carb. Personally I have never tried that. I have 2 good Q jets that were built by well known builders. They both respond the same to similar changes. My car always runs best on the lean side.