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6Likes
12-20-2013, 08:09 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,430
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Not Ranked
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.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Last edited by bobcowan; 12-20-2013 at 08:25 PM..
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12-21-2013, 12:02 PM
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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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12-21-2013, 12:32 PM
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Join Date: Feb 2007
Location: Colorado Springs,
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Cobra Make, Engine: Backdraft, supercharged Coyote
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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.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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12-21-2013, 03:29 PM
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And this is what all those drawings should look like.
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12-22-2013, 04:50 PM
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Bubbles
Quote:
Originally Posted by bobcowan
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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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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12-23-2013, 10:12 AM
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Join Date: Feb 2007
Location: Colorado Springs,
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Cobra Make, Engine: Backdraft, supercharged Coyote
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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.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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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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12-25-2013, 10:51 PM
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Join Date: Feb 2007
Location: Colorado Springs,
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Cobra Make, Engine: Backdraft, supercharged Coyote
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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..........
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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12-26-2013, 10:24 AM
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Surge Tank
Quote:
Originally Posted by bobcowan
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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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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