High flow fuel rails?
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
High flow fuel rails?
I was wondering is it worth it to get high flow fuel rails? I'm trying to piece together a TPI system and need fuel rails. I came accross the site http://www.force-efi.com They sell the fuel rail tubing for $10 a foot. It says the internal diamiter is .500 inch. Anyone know internal size of stock? Oh also my vette has close to 400hp now without the nitrous. So thats why I was wondering about high flow. I know on a stock engine it would be a waste. Could I benifit from these?
Drifting
Joined: Jan 2001
Posts: 1,669
Likes: 1
Re: High flow fuel rails? (Phobos84)
They are not giving you the whole story about the new rails. Yea they sell them by the foot, except I hope you know a good machinist. These rails are blanks and only have the hole going through the middle. They still need to be threaded and they have to be machined for the injectors. A factory set of rails will support you 400 hp with no problems you just need a good pump.
Justin
Justin
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
Re: High flow fuel rails? (Phobos84)
I understand that they need a lot of work. So the stock fuel rails could support 400hp? I just seem to be having a hard time finding a stock one.
using a stock unit would be a lot easier.
using a stock unit would be a lot easier.
Racer
Joined: Feb 2000
Posts: 488
Likes: 28
From: Peabody MA
Re: High flow fuel rails? (Phobos84)
The stock fuel rails are also 1/2" diameters. However, and this is a big however, where the fuel enters the rail (where the rail and the hard line meet)there is a restricter with a TINY hole in it. It seriously limits the amount of fuel that can get into the rail. If you're using stock fuel lines this restriction may not be too bad considering the size of the stock lines.
I had a machine shop weld a 6AN on the front of each rail and another where the return is on the regualtor block. He then made a plate to cover the original regulator so an aftermarket external regulator could be used.
BTW to get the restricter out he used a dent puller and out it came.
I used this setup with a SuperRam a ways back. I have some pics I can post a little later.
-Mike
I had a machine shop weld a 6AN on the front of each rail and another where the return is on the regualtor block. He then made a plate to cover the original regulator so an aftermarket external regulator could be used.
BTW to get the restricter out he used a dent puller and out it came.
I used this setup with a SuperRam a ways back. I have some pics I can post a little later.
-Mike
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
Re: High flow fuel rails? (Phobos84)
Thank you. You probably just saved me a lot of money. Okay this is what I think I'm going to do. I don't want to use the fuel line that's on the car now because it's not high pressure line. The rubber parts of the line are the same as used for carbs. So I think I will run new braded steel fuel lines for in and return. Not sure about size yet. how about 6an in and 4an out? That sound good? Then get the Holly adjustable regulator and use the stock rails with out the restrictor.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
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From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: High flow fuel rails? (Phobos84)
6 in 4 out would probably be fine. However, while you are doing it, why not go 8 in and 6 out. Leaves room for growth. The stock line on the LT1 is around a 6an and plenty of people have supported 400+ rear wheel with just the stock lines. If you are running Nitrous, it may be a good time to consider running an extra line just for it (assuming it is a wet kit) and you can tie it back in with the fuel rail. I am running the stock lines and have added a 6an feed line with it's own in tank pump and it terminates into the stock fuell rail on the opposite side of the stock feed. This gives me a feed line for each rail, plus I use one to feed my rare nitrous use. ;)
Racer
Joined: Feb 2000
Posts: 488
Likes: 28
From: Peabody MA
Re: High flow fuel rails? (Phobos84)
I just put up a few pics of the modified stock fuel rails at http://home.attbi.com/~mikeg73/
The pics are pretty crappy but you get the idea. For this setup I had used a -8 line to a Y-block with a -6 to each rail.
I think I still have them somewhere.
-Mike :chevy
The pics are pretty crappy but you get the idea. For this setup I had used a -8 line to a Y-block with a -6 to each rail.
I think I still have them somewhere.
-Mike :chevy
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Racer
Joined: Feb 2000
Posts: 488
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From: Peabody MA
Re: (scorp508)
I would imagine that one cross over would work fine but not any better than having the two. Plus it helps hold the whole crazy contraption together.
One thing that isn't evident by looking at the picture is that the regulator housing is empty. I used that housing just at a type of block off.
Funny story about why I did this. I was having what I thought were fuel flow issues, somewhere aroung 4500 the pressure would go south even when normally aspirated. I then bought a new stock type adjustable regualtor and had the same problem. I then replaced fuel pumps and had the same problem. Once I put on the external regulator the problem was licked.
Wierd eh?
-Mike
One thing that isn't evident by looking at the picture is that the regulator housing is empty. I used that housing just at a type of block off.
Funny story about why I did this. I was having what I thought were fuel flow issues, somewhere aroung 4500 the pressure would go south even when normally aspirated. I then bought a new stock type adjustable regualtor and had the same problem. I then replaced fuel pumps and had the same problem. Once I put on the external regulator the problem was licked.
Wierd eh?
-Mike
