Part I was the subject of whether it was appropriate to "dead head" a high horsepower fuel rail setup by running fuel flow through one rail to the other and plugging the end of the second rail.

Part II...

I'm going to Y my fuel lines (-08) to each rail and Y back to a single line afterward, but I've discovered a problem. The rails clear the underside of the hood, but with the 1/2 NPT to -08 fittings installed, the driver's side rail (since it sits farther forward) will not allow the hood to close without gouging the hood liner.

I know that 90-degree (or greater) bends should be avoided, if possible, and since it appears that I'll have to modify my fuel rails anyway, I was wondering if there was a rule of thumb for how much rail should be left immediately before or after an injector. In other words, the rail "overhangs" the injectors by about 1.25" in front and back, and then a 1/2" NPT fitting was welded onto the rail by Hogan's.

My idea is to do one of the following...

1. Cut off the 1/2" NPT fittings altogether and have -08 male fittings (already purchased) welded onto the ends of the rails to eliminate the extra adapter required to convert to -08 (why you'd put a 1/2" NPT fitting on in the first place is beyond me). At the same time, I might as well shorten the rails a little for extra clearance, but by how much? Does it really matter?

Going this route, I'd still need an angled AN fitting coming off the end of the rail, but that may be unavoidable.

2. Cut the 1/2" NPT fittings off the rails and then "section" the rails to angle the ends down by 30 to 45-degrees, and re-weld. In other words, cut off the "extra" section of rail after the injector and cut an angle on it sufficient to bring it down below the upper plane of the intake, then weld the pieces back on the rail creating a shallow "C" shape, more or less, and weld on the -08 male fittings. Sort of like this...

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I could use straight fittings in the front and probably 45-degree AN fittings in the rear. The combined angle in the rear would be about 90-degrees, but given the clearance available, there's really no avoiding that anyway. I'd run the fuel in from the front to minimize turbulence and out the back so that the effect would be negligible, hopefully.

My question, however, is if there is a reason for the extra length of the rail before/after the injectors and if this helps smooth out the fuel flow before it hits an injector. If it's negligible and you're messing things up by requiring a sharp angle before hitting the rail anyway, does it really matter? Can I cut the rails back to closer to the injectors (within 1/2" or so) and just start from there with either of the above ideas?

Thanks in advance!

 

1/2" past the injector should not be a problem.