quote:
Originally posted by cabipe:
Any One who runs 351c with 4X48 IDA, who can provide me with a good calibration on those
carb. fore a 351c 10:1 comp. 300 mech. cam.
The most important factor in Weber tuning is sycronization. Use 4 calibrated vacuum meters
so you can monitor the vacuum during operation.
If you use an air cleane, the aircleane MUST
include the air jet cavity between the air horns. NEVER put an air cleaner only on the stacks. If you do you got an emulsion tube barometric pressure missmatch via the venturi channel, and the engine will run terrible rich.
Try this jetting. Emulsion tube F-7, main jet 145, air jet 160, low speed F-10-60.
Venturi 42, long boosters.
It works like this. Low speed up to 2500 rpm.
2000 and up is the main jet area.
If you want the engin richer at only 6000rpm
go down on air jet. Or leaner at 6000 go up on air jet. This leaves the 3000 region undisturbed.
if you want 2000-6000 regiser richer go up on main jet. Or the reverse.
If you want richer 2000-4000, go up on main jet and air jet.
A thinner emulsion tube will richen the mixture from 2000 for the first sec of the acceleration. Tubes with the emulsion holes
low down will lean the mixture out after a few sec. Holes on top makes the main sating to work at once, or we can say leaning out earlier. Emulsion tubes takes experience so I dont recomend fiddling around with extreme tube dimensions.
Remember, if you dont get an IDA to work, dont blame the carburator. Sart thinking what to do, becouse there are no better carb.
You are also wellcome to ask.
Good luck!
Cheers
Goran Malmberg