Howdy All,
Another easy tool to make that is very handy for measuring low pressures around racecars is the following.
The piece is a Magnehelic gage that can measure low and high pressures both positive and negative from 0 to 2" of H2O.
The gage is normally on zero when standing up and I laid it on its back to take the pic. The case is a chepo plastic box from Radio Shack and after cutting the hole for the gage and installing same, the hose connections were added.
You can use this sensitive gage to check out places where small pressure differentials exist such as in the air scoop or underhood pressures.
Of course at speed you would want to be getting the indication on a video or digital pic so that you can drive.
It sure takes the guesswork out of small pressure measurements without spending big bucks!
Regards to All,
HB2