"How To....."
JIC Fittings Size Difference
(May 02, 2017)When choosing connection & hose sizes it's vital to choose the correct spec' for the flow you require.
Common sizes are -6JIC, -8JIC & -10JIC
| Fitting Size | Diameter | Area |
| -6 JIC | 7mm | 38.48 sq/mm |
| -8 JIC | 10mm | 78.5 sq/mm |
Although the increase from -6 JIC to -8 JIC appears small when looking at the ID of the fitting, the area that the fluid flows through more than doubles.
So for example, when upgrading the fuel system for a high flow pump, typically -8 JIC size is used from tank to the pump, so the gravity fed flow can keep up with the pump requirements, then after the pump -6 JIC is used from the pump to fuel rails, pressure regulator & return to the tank.
Remember most pumps prefer to push fluids, not suck.