Landracing Forum
Bonneville Salt Flats Discussion => SCTA Rule Questions => Topic started by: JoeBlystfk on October 12, 2012, 08:35:50 PM
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Perhaps a dumb question, but how does the rule that says no parts of the fuel system may be in the cockpit affect the installation of a mechanical fuel pressure gauge in the dash ?
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Elecrtic gauge or an isolation adaptor between the line with fuel and the gauge. see Summit, Jegs ect.
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The one in the liner has glycerin in the line between the isolator and gauge
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That's not a dumb question at all... the purpose of a fuel pressure isolator is to keep a ruptured gauge line from spraying fuel into the cockpit. The isolator itself must be mounted outside the cockpit or the whole purpose is compromised.
Regards, Neil Tucson, AZ
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That's why I love the internet.....thanks
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You should also use line isolators on your oil line and hydraulic clutch line. A friend of mine made this up for my vintage race car I road race. It does the fuel, oil and the hydraulic clutch in one small unit (4" x 1 1/2") and mounts to the firewall and has the bleeders on the firewall side. Tony
(http://i273.photobucket.com/albums/jj236/maguromic/isolatore.jpg)
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Tony, you have the coolest stuff,and the avitars are't either. :-D
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The value of a fuel line isolator for safety is obvious.
The value of the gauge . . . I can see that you would want fuel pressure going to the data logger. Why do you need it during a run? I'm thinking you are pretty busy to even look at it.
What is the advantage of a mechanical gauge over an electric gauge?
The isolator adds complexity, cost, and another component that can break. Sure, the electric requires a sending unit that can fail, but wiring to a gauge beats plumbing.
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The other advantage of an electrical fuel pressure gauge is you can wire up a low fuel pressure warning light in a high visibility location.
That will get the drivers attention with a lot less focused mental effort than trying to watch the gauge during a run.
Then if the light comes on the driver can glance at the gauge to confirm he/she has a real problem and abort if true.
Larry
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Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D
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Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D
:-D JL222
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Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D
Ahh, vintage data logger for flat heads - a pencil, a pad of paper, a theodolite and a sun dial. :wink:
From what I understand about 97's, you don't want to overpower them with fuel pressure, which I just looked up - 2 1/2-3 psi max - same as a DCOE Weber. What I wound up doing is putting a fuel pressure gauge under my hood after the regulator so I can check it when tuning. If you think you need it, I'd plumb in a pressure switch and an idiot light.
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Well its about a flat head with 97s and a magneto and mechanical fuel pump and an old guy that says we should have a fuel pressure gauge. Data logger......what's that.. :-D
Ahh, vintage data logger for flat heads - a pencil, a pad of paper, a theodolite and a sun dial. :wink:
From what I understand about 97's, you don't want to overpower them with fuel pressure, which I just looked up - 2 1/2-3 psi max - same as a DCOE Weber. What I wound up doing is putting a fuel pressure gauge under my hood after the regulator so I can check it when tuning. If you think you need it, I'd plumb in a pressure switch and an idiot light.
Thats how we have our setup wih the Y-block. Besides, you WILL KNOW if you lose pressure anyway!
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Ok dumb question number two.
Rule 3 k says all vehicles must have a main battery shut off switch. What do you hook it to if you aren't running a battery ?
We are just going to plug in a battery to get the thing started and then it goes in the push truck.
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I would suspect that would mean you would need a positive method to kill all system electrical power -- kill alternator power (assuming you have an alternator) and to cut off ignition (assuming you have a magneto). In short a positive method to stop the engine.
Larry
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I think you said you were running a magneto. Providing that's the only electrical in the car then just install an external switch to ground the mag.
Pete
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Perhaps the rule should say that :-D
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The rule says what it means, you must have a battery cut off switch. No battery, no switch required. As has been discussed at length here before the idea is for the first responders be able to cut all electrical power before they start extraction procedures on the driver.
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I think they need a impact switch as well.
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I think they need a impact switch as well.
That would be for an electric fuel pump, but Joe mentioned a mechanical pump.
I agree with Hotrod - if all you're running for electrical is a magneto with a mechanical fuel pump, there is the potential for a situation where you're unable to shut it down.