[350HP930]

Since its time to start measuring and adjusting port flows I just completed a little fabrication project I have been working on for the last couple of months. A trip to lowes for some plumbing and some dumpster diving at the plastics store near where I work have provided me with all the materials I needed for this little frankenstein project.

Grand total for everything I had to pay for, $30.

At the heart of my beast is the cannibalized turbopump from a 1.25 HP shop vac.

The first thing I did was build a basic flow measurement tube to measure the maximum amount of air this thing could move. If it couldn't flow more than a hundred CFM it would be useless for testing my ports and manifold.

Fortunately my home made water manometer registered a dynamic pressure of about 4.8" of H20 which represents an unrestricted flow of about 200 CFM through the 2" test pipe. Thats should be enough to test and and match the ports on my 930.

When I first rigged a head up to the flow tester before doing my port work it was flowing about 150 CFM through the intake port with 0.4" of valve lift and 14.8" of H20 draw.

With the intake ports opened up to 40mm I am now drawing about 158 CFM using only 8" of vacuum @ 0.4" of intake valve lift.

This is just preliminary data but I will be spending the next few days running a few tests to determine how precise this thing is since measuring relative flows between ports is its primary function. I am too lazy to calculate the exact flow effects of viscosity in the measurement tube, so any CFM calculations could be several percent off.

I know you guys like pics of projects, even the strange ones, so enjoy . . .