Fuel Rails
Thread Starter
Pro
Joined: Oct 2004
Posts: 628
Likes: 5
Fuel Rails
I have a '92 LT-1 with LT-4 intake and heads. The intake has a groove to accommodate the later style fuel rails (i.e. where each side of the rail is connected at both ends of the intake.).
Has anyone know whether the 1992 style is upgradeable or if I can get replacement fuel rails? (I'm also considering an AFPR).
Also - what (if any) are the benefits of the later style fuel rails?
Thanks,
Andy.
Has anyone know whether the 1992 style is upgradeable or if I can get replacement fuel rails? (I'm also considering an AFPR).
Also - what (if any) are the benefits of the later style fuel rails?
Thanks,
Andy.
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
I am looking for answers to this also, as I have a 94 manifold, and with the 93 rails in my Vette they dont fit as well as they did on the 93 manifold. So, I am subscribing to this.
And, did your rails bolt down okay? ANd what injectors are you using?
And, did your rails bolt down okay? ANd what injectors are you using?
Burning Brakes
Joined: Nov 2005
Posts: 908
Likes: 1
From: Colorado Springs Colorado
I suspect that if you log right and left side AFR, there will be a difference on the old design, but I don't know how much. The old design uses a coaxial (tube inside of tube) arrangement on one of the rails to feed the balance tube in the back. Last summer I ran the Kent Moore injector test set on my car (92). It applies a calibrated pulse train on each injector. You monitor pressure drop from a charged rail for each and compare readings to verify each injector's flow rate is comparable to the rest. I got IIRC consistant 2-3 PSI difference between the two rails, indicating to me that that design is restricing flow to the injectors on one side of the engine. I should mention this was done with 30# SVO injectors installed, @ stock flow rates the problem should be somewhat less pronounced. The Kent Moore tool may also be pushing an injector duty cycle you wouldn't normally see in real world driving. But then again, GM wouldn't have changed the intake, rails, and FRC in 94 for no reason at all...
Burning Brakes
Joined: Nov 2005
Posts: 908
Likes: 1
From: Colorado Springs Colorado
If you had a set of 94-96 rails, a TIG welder, and the skills to weld the existing balance tube openings on both rails shut to accomodate new end fittings and a crossover hose, sure. Most would find a later intake a cheaper, easier route. Whether or not it's even worthwhile is still in question.
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
The welding and all that is easy where I work. I have a manifold thats a 93 I am buying, thats been ported etc for my 396. I am looking at keeping my rails, fuel rail covers etc etc. I can sell my 94 manifold, ported and polished easily I hope.
I have seen someone who did do a crossover, cant remember who.
I was thinking, put a AN screw in fitting into the rail at each side and braided fuel line going from one side to the other?
Or just realize, I dont have a track and live with what I have
I have seen someone who did do a crossover, cant remember who.
I was thinking, put a AN screw in fitting into the rail at each side and braided fuel line going from one side to the other?
Or just realize, I dont have a track and live with what I have
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Melting Slicks
Joined: Jul 1999
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From: Olive Branch (Memphis suburb) MS
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I was able to find a set of the later rails to match up with a 95 intake I found. Works great, altough the rails are getting really hard to find now. 
Le Mans Master
Joined: Feb 1999
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From: South Carolina
St. Jude Donor '03 & '05