Gary and John,
That for the feedback. I will agree from what I have read, have not had the seat of the pants feel yet as the engine is not in the car yet, that a 4 barrel will create more HP (all other things being equal) than Webers in the upper rpm ranges. What I was after was the low end torque, and the sound of the Webers too
, to give me more pull coming out of the corners. Most of the tracks that I race on are twisty with elevation changes and one or two moderate straights. I have not raced on a track yet in which I am hitting near redline well before the end of the straight.
I talk to the guy who built the Webers last night and he said that while they have built a lot of Weber systems for big blocks and stroked small blocks, this was the first small block with a standard stroke and iron heads. They set up the main jet initially with a .165 and that was too rich (this is probably the reason for the 200 air corrector. The engine was to making any power and struggled. They switched to the 150 and the engine took off and started making lots of power. Right now it is slightly rich from about 3900-4300 rpms and then there was a little bit of getting slightly lean between 6200-6600 rpms. Then it was stable again after that.
Of course this is all on the dyno and we will have to see what track use does. I ordered a set of 155 main jets just in case I need to get a little richer. I doubt that I need to worry about going leaner with my jetting. Right now the engine is pretty fuel efficient regarding fuel use for a set of Webers. I also have a set of screens for the Webers that I intend to use during races (they fit inside of the air horns) to keep the big chunks of rubber and other things that fly around the track from getting sucked inside and I imagine that that will reduce air flow slightly and may cause a slight increase in richness.
If I needed to change the air corrector, what size would you suggest? As Gary suggested, I am going to go one step at a time with any further changes and wi make no changes until the car has been on the track. Would have been nice to try things on the engine as it was getting refreshed, and the engine builder was planning on putting the old engine on the dyno for comparison sake prior to doing the rebuild, but unfortunately a rocker arm disintegrated at my last race and the engine was not operational.
Jim
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