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Old 03-07-2012, 02:20 PM
91camaroRS3.1
 
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hillborn system

I was checking some picks and saw an old hillborn system on one. i know what there called and i know there some kind of air intake but thats where my knolage ends...can anyone enlighten me on how they work. what kinda power perks they provide? just for my own mental library..thanks guy

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Old 03-07-2012, 02:57 PM
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Hilborn claims that with their Stack Injections that you can pick up between 30-60 h.p., and a very noticeable increase in low-to-mid-range torque due to the fact that a Hilborn system doesn't have a Venturi (and therefore, a restriction) in the inlet air stream-

As far as how they work, are you talking about a Mechanical or EFI Injection? They both get similar results, but operate completely different-a Mechanical system essentially meters fuel through a "pill" that restricts the fuel returning to the fuel tank (but there is a lot more to it than that)-the EFI system really works like any throttle body works-the Computer monitors the afr, and adjusts accordingly depending on engine load, air density, engine rpms and altitide-

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Old 03-07-2012, 03:04 PM
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What he said, the old mech. Hilborn is used for balls out race only but they have been ran on the street by some. The electronic Hilborn is made to work on a street machine and has the ultimate cool factor..........but they are $$$$$$$$$$
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Old 03-07-2012, 06:01 PM
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yea, thats what i needed to know thanks bud. i didnt know they made a fuel injected version. i thought they were for real hotrods. a street version would be cool.
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Old 03-07-2012, 07:13 PM
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No, they are both fuel injection systems, one mechanical fuel injection and one elctronically controlled fuel injection.
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Old 03-07-2012, 07:56 PM
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IIRC, the mechanical version is almost impossible to make streetable, no accelerator pump, idle circuit, etc.

Did a quick search on Hilborn:
A Hilborn mechanical injector is classified as a constant flow system and was designed to operate at WOT under load. As a constant flow system, pressure and volume are controlled by the main jet, or pill, along with pump speed (engine rpm) and nozzle size. The barrel valve, which controls idle fuel and transitional fuel from idle to WOT, can be compared to a ball valve much like the one that turns off the water in your house. The basic design and lack of fuel control of a barrel valve does not allow us to control the fuel at part throttle especially no load part throttle. If you consider the fact that an engine's fuel requirements are based directly on load, and that we can have many different loads at different rpms all at the same throttle angle, the lack of fuel control for street applications becomes apparent. A mechanical system does not employ enough fuel control in the operating range where you drive your street car and, therefore, is not recommended for street use.

Of course we have all heard the stories of mechanical system working on the street but few if any actually worked correctly. The use of a dial-a-jet, additional bypass valves, and home center ball valves have all been used to provide fuel control for adequate street use, but fall far short of the fuel control required as part throttle load is constantly changing. The constant manual adjustments needed, as one guesses the current fuel requirements of the engine, leaves very little time to actually drive the car and, at best, is incredibly inaccurate. Blown applications appear not to be as affected by the lack of fuel control of mechanical injection, possibly due to the load placed on the engine to drive the blower, but is still not recommended for those looking for the best all around drivability.

The use of alcohol helps because of it's large tune-up window, but fails to provide drivability due to loading up, mileage (in gallons to the mile) and severe oil dilution. Claims from those that run injected engines on stands or dyno's stating they can make mechanical injection streetable, are unable to simulate a fraction of the different part throttle load scenarios your engine will see, nor provide the required fuel control. Interestingly enough, engineers have devised a way to electrically control these valves and bypasses...it's called electronic fuel injection.
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