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Old 04-22-2010, 11:00 AM   #1
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Default Fuel rail custom

Hi, I have access to a smithy tour and a 5 axes CNC for the summer, and I would like to build myself a custom High Volume/high flow fuel rail.

I tough that aluminium would be a good material to start with

I would like to know what wall thickness I should keep to be safe, and if it would need to be anodized do to the fact that it will be in contact with fuel.

Plus, what exactly is the size of a "high volume/High flow" compared to a normal B6 fuel rail. I'll be driving 460cc pnp rx7 injectors


Thanks

-Marc-ANdré
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Old 04-22-2010, 11:07 AM   #2
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Stock b6 rail = more fuel flow than you would ever need on those 460s.
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Old 04-22-2010, 11:10 AM   #3
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really, sweet tho

Si with a 190lph, the 460cc and my stock B6 fuel rail, I'll be fine for a while, but if I would had wanted to do a custom one, anybody have info?
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Old 04-22-2010, 12:23 PM   #4
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You want to anodize the inside of the rail?

I'll second the fact that the stock rail is perfectly adequate and even the several production aftermarket rails are overkill for 460's. There are many hi-powered B6 engines on the factory rail. Your time and effort is better spent elsewhere if looking for performance.

If just looking for "looks", I can think of a few other places to start under the hood for my time and money.

You can research the wall thickness of the various production aftermarket rails to get a good idea of the stock to use is you insist. If not using an RRFRP and sticking with a the Walbro 190lph, it's tough to imagine reaching more than 90psi in the rail. Use that as a baseline.
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Old 04-22-2010, 12:27 PM   #5
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OK thanks, was'nt for look, but for power efficiency, at the begenning I was thinking about using a walbro 255lph, but I have been told that they was overkill for a B6 at 14-15 psi and some have problem with them on their AFPR....
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Old 04-22-2010, 12:49 PM   #6
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Put it this way, before you could make enough power to outflow the rail, you would need a built engine, a 6 speed, and something stronger than the usual torsen. Lots of other more worthwhile places to spend your cash.
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Old 04-22-2010, 02:09 PM   #7
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If you are looking for that last %age of security, you can drill and tap the aft end of the stock rail to make it dual-feed. You have access to a shop, drill out the rail and tap it for a 3/8" or whatever barb, and feed both sides of the rail. That will get you uniform pressure at both ends. You certainly don't need more fuel, but even pressure is ideal.

In the past, there was a big "issue" with cylinder#4 being prone to damage while other cylinders were fine. It was thought on boosted cars that the aft cylinder was being starved for fuel under hi flow. Later is was discovered that most of those cars were victims of the factory coolant routing and overheating due to bad coolant flow and not fuel starvation.
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Old 04-22-2010, 02:12 PM   #8
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cool, thanks alot, good informations to knows! maybe considering the coolant reroute ....
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Old 04-22-2010, 02:21 PM   #9
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I believe in the USEFUL SAVED POSTS forum, there is at least one writeup on how to DIY dual-feed a stock rail.
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Old 04-22-2010, 02:25 PM   #10
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