Modifing S4 Fuel Rails

classicauto · 08-29-2008, 04:02 PM

I'm not sure about the N/A rails, but S4 TII rails are already threaded. Some metric 1.5 pitch, don't recall exactly what.

But have a look at the N/A one's you've got, if the PD and FPR are threaded in and not stamped as part of the rail, just undo them and take a thread gauge to them and purchase the appropriate adapters.

Also, the tap's you've got should fit in the diameter, but there may not be much beef in the rails for a tapered thread if they're stamped pieces..........and if they're not stamped, you won't need to tap because they're already threaded

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08-29-2008, 04:02 PM	#2
classicauto crash auto?fix auto Join Date: Feb 2008 Posts: 816 Rep Power: 18	I'm not sure about the N/A rails, but S4 TII rails are already threaded. Some metric 1.5 pitch, don't recall exactly what. But have a look at the N/A one's you've got, if the PD and FPR are threaded in and not stamped as part of the rail, just undo them and take a thread gauge to them and purchase the appropriate adapters. Also, the tap's you've got should fit in the diameter, but there may not be much beef in the rails for a tapered thread if they're stamped pieces..........and if they're not stamped, you won't need to tap because they're already threaded