increase the main jet size by 1 or 2 numbers
Is it true that since all main rods have the same tip diameter, changing the jet will affect both WOT and cruise mixture. So if I just want to richen the cruise mixture I would need to change the rod and not the jet? Conversely, if I want to richen WOT but not cruise, I would increase the jet and the rod so that the area difference is the same at cruise?increase the main jet size by 1 or 2 numbers
I spoke with quadrajetpower regarding the idle mixture screws not having an affect on the idle and they told me that this is normal with a large cam. I’m used to adjusting the idle mixture screws with a vacuum gauge and seeing the needle move to know where I’m at. At least that’s how I’ve done it with my holley’s. I had a little run on before but I richened the idle mixture a bit to get rid of that but I’ll try to richen the mixture up some more to see what happens.Id look at the idle system first. If that doesn't improve it enough, richen the main system.
So the carb currently has 43B primary metering rods in it after speaking with the carb builder and he recommends I go down a size so the next sizes are 42B and 39B but which pair do you recommend me purchasing? Like I said it doesn’t stumble when at WOT but you would still recommend going down a size or two in the main jets as well? He hasn’t told me the jet size yet but I would like to know so when I take it apart I can put the jets in at the same time.for WOT I would concentrate on the secondary fuel as it's much greater.
if you are getting a lean surge, you are really lean, and probably need to richen the mixture everywhere a little. Get a wideband if you want to get into more precise tuning.
May have taken a bit longer , but before the advent of affordable A/F meters , we were able to get the job done .There is no substitute for an oxygen sensor/gauge. No guessing what your fuel delivery is doing.....
And how would you get the job done? Guess, make change, guess again, make change, etc., etc., etc.? Still never sure what A/F ratio you have at idle, light loads, heavy loads, and WOT...We aren't in yesteryear any more....and reading the plugs doesn't tell you anything but "average" over some period of timeMay have taken a bit longer , but before the advent of affordable A/F meters , we were able to get the job done .
You have your opinion , I have mine , both have been adequately stated. Further discussion is useless .Oh good Lord, 2old2fast..... Whoever reads what you wrote will be rolling their eyes....your "doesn't really benefit" part is classic.... and by the way "the Neanderthal way" is understandable ... Maybe I'm the stupid one... is it not an ideal condition a 12 to 15 to 1 fuel air ratio the ideal target? Yes or No. Does an A/F sensor/gauge give you just THAT? Perhaps you should educate all of us radical idiots who read your response as to what your "Neanderthal way" is to choose/select the correct jets/rods/adjustments etc. to reach the closest target possible at idle, part throttle, part load, heavy load, and WOT ? Sure, altitude, weather, etc. affect things, but surely you aren't serious about that aspect of getting it right the first time........ I'll wait for your detailed response.