Hi John,
Attached is a pic of the wedge. I used controller rather than outflow valve throughout my first posting on this. Outflow valve is a better description. You interpreted my suggestions correctly.
Here is a pic of the wedge. Length from the bend is 4". The slot is 7/8" wide and the short angle section is 1". The overall width is 4". The slot is 2.5" deep. The piece is scrap from something on a IV..... sorry I have forgotten what but hopefully it is still lying around your shop. the other two bits are what I used to set the tension holding the outflow valve closed.
I noted a suggestion that you block off the outflow valve tub from the top and fly the airplane. Keep in mind that the over pressure pop off valve will also be disabled if you do this since if is normally in the tub. I would double check that you can't over pressurize the cabin and damage it before trying that suggestion. I assume but don't actually know that the pop off valve protection is required if the outflow valve jams closed.
My mixing box came from Lancair with the pressure dump and temp mix levers only partially tightened. One of my early discoveries was that the pressure dump flapper worked intermittently until I tightened the lever securely. You have either a big leak, bad outflow valve, or leaky pressure input to the cabin if you are only getting 1/2 PSI. I was able to get 3.5 PSI before I found my last significant leak. It was easily found with two shop vacs but not with one.
Hope this helps.
Jack
<IV Pwedge.jpeg>
On Sep 5, 2013, at 6:01 AM, Lancair Mailing List wrote:
Subject: IVP pressurization
Date: September 4, 2013 7:42:10 AM EDT