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Registered
Join Date: Apr 2010
Location: Los Angeles
Posts: 1,184
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Need fuel rails for EFI conversion from CIS
I am putting together a package to convert my 3.0 CIS to full sequential EFI, using the stock CIS intake runners and air box.
I have been looking for an aftermarket set of fuel rails that maintain the stock injector spacing, and so far have only found them available from Patrick Motorsports. They are nice, but I was wondering if anyone has come across some lower-cost options, perhaps using extruded fuel rail. Any leads would be greatly appreciated. Thanks. |
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10-15-2022, 12:47 PM
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Join Date: Dec 2020
Location: The Swamp and NC
Posts: 450
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You can get blank fuel rail from Jegs/Summit .. Cut it to the length you want, mark the injector spots, drill and counter sink, tap the ends and make some mounts. Easy. The top and bottom of the injectors are held in with "O" rings so sub thousands tolerance is not required.
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I'm not picking my nose..I'm porting my upper intake manifold. |
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10-15-2022, 02:36 PM
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Full Send Society
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I made vacuum rails from fuel rail stock- it was super easy to machine. All I had was a drill press. Piece of cake.
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-Julian 1977 911 S: Backdate, EFI/ITB, AC project in the works: http://forums.pelicanparts.com/porsche-911-technical-forum/1106768-when-well-enough-cant-left-alone-backdate-efi-itb-ac-more.html |
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10-15-2022, 03:12 PM
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ROW '78 911 Targa
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Tony at Bitzracing will likely sell you the injector hole adapters and fuel rails.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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10-15-2022, 05:15 PM
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Join Date: Apr 2019
Posts: 101
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 I did what you mentioned with the fuel rail stock. It’s doable, but it’s a bit of work and requires some tooling. I happened on a cheap porting tool on eBay for the -8 ORB end fittings. These could have been npt. The injector holes were drilled and reamed 13.5mm with a 1/4” through hole and a little chamfer for the o ring to slide in (if I remember correctly). The hardest part is the hold downs. It all works and has been running in my car for a while. Sent from my iPhone using Tapatalk |
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10-15-2022, 05:42 PM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,710
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Rails
While working with RHD to help develop their ITBs for the 911 engine, I reviewed a few of the proto revisions.....and this is a set of rails from one of the early iterations.....they are a little colorful, but that can be easily remedied, if required. You'll need to make your own mounting brackets........but they are yours, if you want them.....
regards, al  
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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10-16-2022, 08:30 AM
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Registered
Join Date: Apr 2010
Location: Los Angeles
Posts: 1,184
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Quote:
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10-16-2022, 10:26 AM
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Heinz
