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Kirkham Motorsports

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  #21 (permalink)  
Old 12-20-2013, 08:09 PM
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The surge tank is there to maintain a constant flow and pressure to the injectors no matter what the car's doing. It's handy for racing, drifing, autocross, and even off roading. Some aircraft use them. By design, the surge tank is pressurized, and as close to the injector fuel rails as possible. Carb float bowls are unpressurized small surge tanks.

You can place the surge tank almost anywhere. I suppose you could even place it inside the original tank to save space. But it's going to be most efficient placed as close to the injector rail as possible.


http://www.superstreetonline.com/pro...el_surge_tank/


http://msextra.com/doc/ms3/fuel.html

Another use for a surge tank is conversion from carb to EFI - like an old Mustang. The original mechanical pump feeds a surge tank containing a high pressure pump - which then feeds the injector rails.
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  #22 (permalink)  
Old 12-21-2013, 12:02 PM
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Default Surge tank

Please explain how efficiency is gained by placing the surge tank near the fuel rails, I can see having the high pressure pump close to the rails for a slight efficiency improvement but the surge tank is pressurized so why would it be better, the line from the surge tank to the HP pump also gives a little more fuel capacity to the system. The key is that the high pressure pump must never see air or the engine will stumble.
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Old 12-21-2013, 12:32 PM
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With the surge tank and HP pump close to the fuel rails, your chance of developing an air bubble in short a short space is almost zero. Some surge tanks have the pump inside the surge tank, and then mounted in the engine bay.

Keep in mind that we're talking about very high performance vehicles and driving. Far above what I (and most people here) do.
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Old 12-21-2013, 03:29 PM
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And this is what all those drawings should look like.
guye, Gav and jcraigau like this.
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Old 12-22-2013, 04:50 PM
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Default Bubbles

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Originally Posted by bobcowan View Post
With the surge tank and HP pump close to the fuel rails, your chance of developing an air bubble in short a short space is almost zero. Some surge tanks have the pump inside the surge tank, and then mounted in the engine bay.

Keep in mind that we're talking about very high performance vehicles and driving. Far above what I (and most people here) do.
The surge tank is pressurized @5 psi with a return vent to the main tank to eliminate bubbles in the line to the high pressure pump. The pumps generate enough heat without adding engine compartment heat too, I guess we will have to agree to disagree on this subject.
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Old 12-23-2013, 10:12 AM
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I don't think we're agreeing to disagree. I think we're agreeing that there is more than one way to skin a cat.
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Old 12-25-2013, 02:48 PM
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I guess it depends where you want to put that extra weight... Over the rear wheels or over the front wheels. There is also all the extra fuel lines etc, lot of weight there.
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Old 12-25-2013, 10:51 PM
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That's true. A lot of weight, cost, complexity, and failure points. If you need one, build it. If you don't..........
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Old 12-26-2013, 10:24 AM
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Default Surge Tank

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Originally Posted by bobcowan View Post
That's true. A lot of weight, cost, complexity, and failure points. If you need one, build it. If you don't..........
You are all correct, lots of complexity and some extra weight, but if your Cobra
handles well enough there no other option. A carb will flood or cut out and fuel injection needs a constant flow of relatively cool fuel. Drag racers don't run fuel coolers for no reason, so putting pumps and tanks in the engine compartment is not a good idea.
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