PDA

View Full Version : Port Question



MemphisSoul4U
07-14-2003, 10:24 PM
On WinISD, does a 4 inch port mean 4 inch internal or external diameter?? :confused: :banghead:

MemphisSoul4U
07-15-2003, 12:08 AM
So a 4" PVC pipe wouldn't work? Cause they are measured externally aren't they?

ShaunMac
07-15-2003, 12:43 PM
I think PVC is measured for internal diameter. This allows for calculations of flow rates.

The port doesn't have to be 4". It could be 3.75" or 3.85"
It would just require a different port length for the same tuning freq.

Go to Lowe's and check out the PVC sizes to be sure.

MemphisSoul4U
07-15-2003, 05:03 PM
Yea, I double checked on a 1.5" piece of PVC I had lying around. It is internal, but I just wanted to be sure.Thanks