Anyone had top feed fuel rails on an EA82T ?

discopotato03 · Post by **discopotato03** » Tue Dec 01, 2009 6:24 pm

Just curious to know if anyones had top feed fuel rails made for an EA82T , specifically a spider manifold one . By top feed I mean the type that takes an injector with an O ring at the top .

I've seen pics of one on a Nissan L Series six and it used long skinny bolts and bridge pieces to hold the rail in place . The bolts had tubular bushes on them to stop them compressing the injectors themselves .

Thoughts ?

Cheers A .

Gannon · Post by **Gannon** » Tue Dec 01, 2009 7:30 pm

By the looks of this...

This ER27 looks like it has alloy fuel rails, and this picture confirms that ER27 injectors have O rings

So it has top feed injectors, and at a guess, the bosses in the intake manifold would be the same as the EA82 ones

But that probably doesnt help you much as ER27 injectors are only gonna flow as much as EA82 MPFI injectors.

ER27 injectors also have a built in resistor

discopotato03 · Post by **discopotato03** » Tue Dec 01, 2009 9:31 pm

Thanks Gannon , the injectors themselves are easy to find once you have top feed O ring style fuel rails and the whole lot is sooo easy to work on compared to hose barb type .

Actually both the EA82 and ER27 are whats known as EV1 style injectors and they both are held in the manifold with plates/insulators/cushion rubbers and the lower seal itself .
As you know the hose barb type fuel rails fight you every step of the way particularly on an L type EFI engine . The spider rails are a little easier to get up out of the hoses but not a walk in the park .

Later EV6 and EV14 O ring injectors are held down purely by the rail and have more modern internals .

I must have a sticky at the old 82 and see if their heads have the threaded bosses like the 27's do though that doesn't seem likely .

A .

discopotato03 · Post by **discopotato03** » Thu Dec 03, 2009 8:05 am

I had a look at a spare set of EA82T heads and I don't think theres any suitable anchor points for an O ring style fue rail - other than those four tapped holes that hold the std injectors down on the manifold .

Actually injectors on an MPFI EA82 are quite close together so the aluminium extruded rail probably only needs to be 3-4 inches long .
Mounting brackets could work like this .
Cut some reasonably thin sections of sheet steel and fold 90 degrees to make the angled sections . Drill them to match the hole centers of the std injector mount holes and this forms the anchor points for the brackets on the manifold . The vertical sections are made to place the rail at the correct height above the manifold the clamp the injector in place without crushing it . Drill the clamp brackets , drill and tap the square section of the rail and assemble with allen head cap screws .
The outer or lower bracket needs to be wider than the inner one because the bolt centers are wider . So long as you have access to the injectors plug space its as simple as that .

The rails need to have the correct spacing for the injectors and all thats left to do is tap the ends of the fuel passage and screw in barb fittings for the supply and return lines .
It wouldn't be hard to make the system twin feed and return rather than one circuit if you were concerned about pressure loss at the last injector in a std style system .

Cheers A .

discopotato03 · Post by **discopotato03** » Fri Dec 04, 2009 9:13 am

A few pics of what a fella from USMB had on his RX Coupe .

http://subarutex.com/gallery/v/RX/

He was still using hose barb injectors and chose to use braided lines and aluminium fittings . Also a different FPR .

Note the 90 deg rotated Spider TB and I'm not sure what bonnet scoop .

Interesting to see Rex exhaust bits for the first half of the system .

Cheers A .

steptoe · Post by **steptoe** » Fri Dec 04, 2009 12:39 pm

notice the engine running when pic taken?

H-top · Post by **H-top** » Mon Dec 21, 2009 10:02 pm

I' ve been meaning to get on the tig at work and make some rails for a long time lol