Greetings all,
It's been many moons since I last posted. Out of frustration, I parked my car late in 2012 and am just now getting back to it. It has an NOS Holley 2280, 2 bbl (purchased from the same eBay vendor as Reed and others). I have determined that it also has the vacuum-actuated power valve, the same as Reed's 2280, as discussed in this post:
http://www.slantsix.org/forum/viewtopic ... +2280+rich
Here is a pic of my carb:
As you can see, there is no linkage where the power valve would otherwise be - on the left. With this type of valve, as I understand it, lower vacuum pressure causes the valve to open, and feed more fuel when needed.
I have an a/f gauge, and it shows a mix of about 14.5 to 15.0 at idle. When I begin driving, and am feeding it any throttle at all, the gauge goes off the bottom of the scale (which ends at 10.0 - very rich). Based on info in Reed's link, above, I suspect I may have a vacuum leak, which is causing the power valve to open too soon, and close too late. Unfortunately, I have not been able to find a leak in any of the usual locations: rubber hoses/lines or intake manifold gasket.
My questions:
1.) How much vacuum should a 225 normally produce at idle? Mine is currently showing 18 inches.
2.) Approximately how much vacuum should I see at a steady cruise on level ground?
3.) How much vacuum is required to avoid actuating the vacuum power valve on a 2280 (i.e. when should it open, and when should it close)?
As always, many thanks for your help.
Roger