| Carb Jets [message #63835] |
Wed, 11 November 2009 10:41  |
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Well I got my new box of tuning parts from holley, and was able to pretty much tune out the accelerator pump bog I was gitting right off idle, basically the pump shot wasnt enough to get the job done so holley supplies a set of cams to change the duration and volume of the pump shot. one screw and about 3 minutes is all it takes.
then I decided to see if I could lean out my jetting to improve cruise milage, so I purchased 2 sets of jets, the stock size was 65, so I thought it would be a good idea to drop it 5 to 10 numbers, so I ordered a 60 and 55 jet. one thing about the holley, the jets can also be changed in about 5 minutes, but you will usually spill a couple ounces of fuel removing the fuel bowl, paper towels are a must here!
so I put in the 55s first, put it back together and start'er up, motor runs fine until I take it for a test drive, way too lean and no power! unvelievable how much difference a couple thousands of an inch make! so im like F this and put in 60s, it ran better but still no cigar, but at least it didnt stall, problem was now to get power I had to press the accelerator pedal to the floor to get the PV to open then we were off. so im thinking the leanest I should go should be a 63 jet, which is 2 down from stock. it seems the holley came pretty close outta the box, for best power, so it seems my lack of carb experience (im a fuel injection guy) has tought me that in carbs, less is actually still less!
I know most here are actually Q-jet types but I assume some have had exp with the holley units, the carb runs great stock, just looking for that extra 1-2 mpg outta her. so any advice as o jet size? although granted I am running watered down CA fuel which is notorious for giving you 10-15% less mileage but costs more, so maybe im already at the sweet spot for the fuel....
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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