New Product: High-Flow Billet Fuel Rails
#46
Three Wheelin'
Join Date: Mar 2010
Location: Colorado Springs, CO USA
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What diameter of fuel line is needed back to the pump, and what pump upgrades are needed, so that you can actually take advantage of these larger diameter rails rather than just moving the bottleneck to a different part of the fuel system?
#48
Under the Lift
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The injector to rail clips are essential with the stock rails, as everyone agrees, due to the limited travel in the rail fittings over the tops of the injectors. The clips are slightly tricky to get seated properly. Fail to seat the clips or leave them off and a fuel fire is a certainty, as I witnessed firsthand once. Also, if the lower tips of the injectors were held hard against the stops inside the manfold somehow, the pintle caps could bust off. I've seen this in some 87's where the manifold mounting points for the rails were missing some spacers, inadvertently positoning the rails too close to the manifold and locking down the injector tips against the manifold. Later manifolds repositioned the mounts and eliminated the spacers. I'm not suggesting any problems here with Carl's rails, just adding a few comments about the stock rails.
Anyway, Louis and others have been using this type of billet rail for a long time with the only issue I know of being heat soak.
#49
Drifting
#50
Captain Obvious
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#51
Developer
Thread Starter
I sell a lot of these billet fuel rails and they work very well. I suppose they have been in the field now for a coulple years, and I have raced them for several years as well.
They sure are a lot easier to install/remove than the stock system with the clips.
Not only do they flow more fuel, but the larger amount of fuel held in the rail provides the necessary hydraulic dampening for the injectors pulses, meaning the factory fuel dampeners are no longer needed. We still provide the dampening of the injector pulses, but do so thru the increased fluid content held in the rail.
They sure are a lot easier to install/remove than the stock system with the clips.
Not only do they flow more fuel, but the larger amount of fuel held in the rail provides the necessary hydraulic dampening for the injectors pulses, meaning the factory fuel dampeners are no longer needed. We still provide the dampening of the injector pulses, but do so thru the increased fluid content held in the rail.
#53
Looks great Carl. These are a must if your supercharging and want to upgrade to AN fittings and fuel lines. I'm sure the stock setup is fine but I like being able to run a BEGI, FMU, or pressure gauge where I like and in different configurations.
#54
Captain Obvious
Super User
Super User
Lets not confuse things. They might be a must if you want to use AN fitting and not a must for supercharging. The FMU, or any other type of fuel return line managemet, splices into the flexible section of the return line. And this is downstream of the rails.
#55
Drifting
Carl, Thank you for explaining some of your connections in e-mail the other day.
Could you please supply some pictures of how the lines at the rear of the rails connects to the regulator and what you did to connect the fuel line at the front to the line at the car (picture again please)
Thanks alot as this will help anyone else that is having the same trouble I am.
Brad
Could you please supply some pictures of how the lines at the rear of the rails connects to the regulator and what you did to connect the fuel line at the front to the line at the car (picture again please)
Thanks alot as this will help anyone else that is having the same trouble I am.
Brad
#56
Developer
Thread Starter
I'm sorry I have no photos of a non-supercharged 928 with these fuel rails installed. I did once, but we had a hard drive crash some time ago and some photos were lost - these being part of that.
I've sent you all the photos I have...
Perhaps a Rennlister can post photos of how he ran his fuel lines.
I've sent you all the photos I have...
Perhaps a Rennlister can post photos of how he ran his fuel lines.
#57
this thread answered my question on using these rails as part of a full fuel system overhaul with aftermarket FPR and Y-block to the rails. Any cautions or caveats for this? I'd be doing this as an early stage (with stock pump, computer, etc) of a refresh.
End state hoping for NA engine with Megasquirt with full COP and individual injector control. Off of the Jetronic and a far physically simpler fuel delivery system. Pie-in-the-sky right now (and honestly, with my mild ambitions batch control would work - more of a geek 'because i can' thing.) But I've got nothing but time and laptops, and the occasional toy funds to get me there. Figure this is as good a place as any for "stage 1" of this as I don't trust my original fuel lines and need to take the fuel system apart anyway.
End state hoping for NA engine with Megasquirt with full COP and individual injector control. Off of the Jetronic and a far physically simpler fuel delivery system. Pie-in-the-sky right now (and honestly, with my mild ambitions batch control would work - more of a geek 'because i can' thing.) But I've got nothing but time and laptops, and the occasional toy funds to get me there. Figure this is as good a place as any for "stage 1" of this as I don't trust my original fuel lines and need to take the fuel system apart anyway.
#58
Rennlist Member
I sell a lot of these billet fuel rails and they work very well. I suppose they have been in the field now for a coulple years, and I have raced them for several years as well.
They sure are a lot easier to install/remove than the stock system with the clips.
Not only do they flow more fuel, but the larger amount of fuel held in the rail provides the necessary hydraulic dampening for the injectors pulses, meaning the factory fuel dampeners are no longer needed. We still provide the dampening of the injector pulses, but do so thru the increased fluid content held in the rail.
They sure are a lot easier to install/remove than the stock system with the clips.
Not only do they flow more fuel, but the larger amount of fuel held in the rail provides the necessary hydraulic dampening for the injectors pulses, meaning the factory fuel dampeners are no longer needed. We still provide the dampening of the injector pulses, but do so thru the increased fluid content held in the rail.
How's that work?
#59
IANAE, but - as Carl stated, it's a volume thing. The stock rails have less volume in them, so a pulse could conceivably starve a point in the rail. These rails have more volume, more fuel, at any given point in time, so the low point in a pulse wave doesn't drain them to the point of starving an injector.
Throw a big rock (making a pulse) and the wave could empty a kiddy pool. Throw the same rock in a big in-ground pool and the pulse is less impactful. (Kiddy pool to in-ground pool is of course a larger magnitude of difference than between stock and aftermarket fuel rails, but you get the illustration.)
Throw a big rock (making a pulse) and the wave could empty a kiddy pool. Throw the same rock in a big in-ground pool and the pulse is less impactful. (Kiddy pool to in-ground pool is of course a larger magnitude of difference than between stock and aftermarket fuel rails, but you get the illustration.)