Custom fuel rail, for stock injectors Options

[yarin]

Like most people I'm not too thrilled with the design of the fuel rail system. I'm planning on buying 2 6" pieces of aluminum fuel rail and tapping it for 5/16" barbed fittings (3/8" NPT). I'm assuming that 3/8 NPT -> barb 5/16 exist. I found em.. on ebay

Does anyone know what the exact OD of the fuel injectors are? I'd like to use 5/16" high pressure fuel line on everything.

I'm pretty sure I'll have to fab a bracket to support the extra weight of the fuel rail. I'm surprised the stock fuel rail is floating.

I'll also tap a 1/8" NPT for the fuel pressure gauge.

I've seen a fuel rail kit on the market, but it costs $170 or so. I can build this for ~$30.

[lapuwali]

QUOTE (alpha434 @ Feb 21 2006, 01:10 PM)

I concur.... (IMG:http://www.914world.com/bbs2/html/emoticons/w00t.gif) The stock injectors can only handle what? 26 psi? Newer injectors are available that can handle much greater pressures and deliver fuel much faster. And can be had for a minimal amount of time and effort.

Well, you're concurring for the wrong reasons. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)

The stock D-Jet injectors actually flow too MUCH for near-stock engines, so better flow really isn't the aim. Rather, by using O-ring injectors that plug into spigots in a modern-style fuel rail, you're eliminating two hose-barb connections per injector. The higher operating pressure is also desirable from an atomization perspective, as long as you engineer the rest of the fuel system to operate at the higher pressure, too. Again, IF you're going to go to the trouble to make modern style fuel rails, I'd go that extra mile to do the rest of the system to modern standards, too.

Again, however, the "outdated" D-Jet way of doing things seems to have worked well for the last 30 years, so the reliablity concerns over the extra connections and the free-floating fuel rail seem to be unwarranted.