ive been looking around who makes an aftermarket fuel rail for the lt1??

 

I think your SOL there. The fuel rails themselves can flow alot of fuel, its just getting the fuel routed properly. I had fittings welded to the stock rails to accept AN fittings. I did make over 500 RWHP on the stock setup though.

 

Well I believe rochester makes the stock units, so you might try them to see if they have an upgrade.

 

If you put big enough fittings on the stock rails, you'll flow more fuel than you'll ever be able to use... the bottleneck is the stock pump and lines. And even the stock lines are good for 700rwhp with the right pump setup.

 

Put them in parallel, rather than in series. I push 800HP through the stockers, including 300HP of dry nitrous. -6AN line into the back of each rail, a -6AN return line welded to the diagonal cross-over pipe. Above that HP level, weld a -6AN return to the front of each rail for the returns. I've seen them support 1,125flywheelHP with no problems.

If that's not enough, Kinsler sells 0.680" ID fuel rail stock, and the bits to drill the holes for the injectors. Running at a higher fuel pressure also helps minimize the impact of fuel rail pressure variations and pulsing.

 

this is what my "stock" rails look like...

-8an feeds to the backs of each rail
-6an returns at the front.

 

 

Thanks alot guys some really useful stuff here still learning about fuel systems though so any advice at all would be good

 

Two in the back, AFPR mounted under the cowl:

http://www.injuneer.com/images/photo.../DCP04227a.jpg

Return line of the cross-over pipe, and pressure tap on the rail:

http://www.injuneer.com/images/photo.../DCP04272a.jpg

http://www.injuneer.com/images/photo.../DCP04257a.jpg

 

Roadie,
What AFPR are you running?

 

Aeromotive 13109.

It's certainly not the biggest and baddest (13110 or 13114 are nice pieces), but it's a great size for flowing dual in-tank pumps, both running full time. I pumped fuel through the system for 10 minutes without any draw (engine not running) and the pressure didn't creep up.

 

Yeah, I am trying to design up my system. I am thinking of using a y-block in back splitting into hard lines that run to the front of the rails ( not sure whether to use the crossover holes or seal them up and drill holes in the front of the rails). Then hard lines out the back and mount the AFPR right there. I was thinking 8 in and 6 back.

Could you tell me exactly what fittings you welded in because im new to all this AN stuff and could definately use some guidance.

Thanks

 

Anywhere you plan to connect lines to needs flared fittings. The flared surface is what hose ends seat to for sealing. For anything else, you can use pipe thread or weld-in fittings or whatever works best for you...

I have a set of rails with -8an fittings welded to the back of them. I can't weld aluminum and the guy I brought it to didn't do the cleanest job, so I thought I would try tapping the rails for better looks and the picture here is the result of threading and tapping the rails. I think it came out pretty good.


Details: I drilled out the rear-facing ends and tapped them for -8an (3/4"-16 bottoming tap) and screwed in -8an o-ring boss to -8an flare fittings. I used an o-ring boss because they are shorter and that side is threaded to the end.

Where the crossover tube used to be, I tapped them for -6an (9/16"-18), again with a bottoming tap. I then sliced off one of the flare ends of 90* -6an flare unions (so only threads remained) and screwed them into the rails. If the fitting didn't point straight up, I just tapped the hole a bit further until it did.

I used the same white teflon based thread sealer on the fittings for final assembly. It's the same stuff that you seal head bolts with, found at any auto parts store.

 

I looked at the link in your sig, and I just gotta say DAMN! niiiiice caprice. I'm very jealous! looks like a lot of hard work went into that... and on top of it you wont have to worry about rust! is that por15? clean.

 

It's actually Herculiner roll on bed liner.