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Re: Fuel Volume vs. Fuel Pressure
[Re: TRENDZ]
#1934913
10/19/15 12:44 PM
10/19/15 12:44 PM
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Joined: Jan 2003
Posts: 26,418
United Socialist States of Ame...
tboomer
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 26,418
United Socialist States of Ame...
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I don't know what a fuel pump has to do with a cistern? But I did talk with a tech from Aeromotive this morning and he recommended The same pump that Jim has on his N/SS car...
Need your rear end checked out? Contact Grizzly!!
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Re: Fuel Volume vs. Fuel Pressure
[Re: dogdays]
#1934992
10/19/15 03:11 PM
10/19/15 03:11 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You just proved you're not a scientist.
R. Nice come back. What exactly did I say that is wrong? You can have PRESSURE and ZERO flow. FACT. Now prove me wrong.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Fuel Volume vs. Fuel Pressure
[Re: 340B5]
#1934996
10/19/15 03:15 PM
10/19/15 03:15 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You can have pressure and ZERO flow. That is why if I have to use a .500 fuel line I want the pressure to the regulator to be 30 pounds or more. A bigger fuel line has more fuel in it, thus more weight. So if you don't raise the line pressure you can have pressure but zero flow. Seen it a bunch of times.
That said, most of the time it shows up in 60 feet. I know what you meant and you're right. More fuel mass in the line has more inertia so it has more of a tendency to stay put during launch, hence the need for more pressure to move it forward. Exactly. But the keyboard know-it-alls need to have it spelled out for them. Guess I should have spent my time educating them for free.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Fuel Volume vs. Fuel Pressure
[Re: tboomer]
#1935006
10/19/15 03:33 PM
10/19/15 03:33 PM
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Joined: Oct 2007
Posts: 4,219
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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I did talk with a tech from Aeromotive
To a hammer, everything is a nail.
When has a manufacturer not said "you need a big pump"?
For those of you who still think that the car is faster in direct proportion to the amount of money spent (i.e., billet = power), I'll quote David Vizard (slight editing) on fuel supply requirements, not as line size but in terms of how much must be actually received at the carb inlet.
"Brake Specific Fuel Consumption (as shown in dyno tests): how many lbs. of fuel per hour per horsepower the motor needs; .5 lbs./hr is a safe minimum figure.
.5 lbs/hr/hp × 500 hp = 250 lbs./hr
add 50% safety margin for restrictions, inertia, bends, etc. = 375 lbs./hr
gas = 6 lbs. per gallon
62.5 gallons per hour is more than sufficient for a 500 hp motor."
Sooo... your BG 400 pump is JUST RIGHT for that 3200 hp motor...
Boffin Emeritus
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Re: Fuel Volume vs. Fuel Pressure
[Re: polyspheric]
#1935028
10/19/15 04:12 PM
10/19/15 04:12 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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I did talk with a tech from Aeromotive
To a hammer, everything is a nail.
When has a manufacturer not said "you need a big pump"?
For those of you who still think that the car is faster in direct proportion to the amount of money spent (i.e., billet = power), I'll quote David Vizard (slight editing) on fuel supply requirements, not as line size but in terms of how much must be actually received at the carb inlet.
"Brake Specific Fuel Consumption (as shown in dyno tests): how many lbs. of fuel per hour per horsepower the motor needs; .5 lbs./hr is a safe minimum figure.
.5 lbs/hr/hp × 500 hp = 250 lbs./hr
add 50% safety margin for restrictions, inertia, bends, etc. = 375 lbs./hr
gas = 6 lbs. per gallon
62.5 gallons per hour is more than sufficient for a 500 hp motor."
Sooo... your BG 400 pump is JUST RIGHT for that 3200 hp motor... a BG 400 pump doesn't pump 400 gallons per hour. Neither does a magnafuel 275 pump 275. These are all Barry Grant misleading numbers a 5/8th garden hose will only flow between 200-300 GPH with no restrictions depending on pressure
Last edited by sixpackgut; 10/19/15 04:19 PM.
Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Fuel Volume vs. Fuel Pressure
[Re: Monte_Smith]
#1935068
10/19/15 05:16 PM
10/19/15 05:16 PM
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Joined: Dec 2003
Posts: 23,516
Here
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 23,516
Here
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Since we are using golf balls, water cisterns and all kinds of other useless crap, in relation to race car fuel systems.........how about this. I don't have any type pump on my house and I have good pressure and volume in the shower.........so hmmm...........hell maybe we don't even NEED fuel pumps.........LOL!!! Obviously my cistern analogy went over your head. I did however exempt you from the golf ball analogy. And sorry you couldn't form a legit question to my comment I could respond to.
"When one’s appeal is emotional, it does not matter if there is no substance."
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Re: Fuel Volume vs. Fuel Pressure
[Re: Monte_Smith]
#1935086
10/19/15 05:51 PM
10/19/15 05:51 PM
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Joined: Jan 2005
Posts: 176
Sterling Heights, MI
John_T_Brown
member
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member
Joined: Jan 2005
Posts: 176
Sterling Heights, MI
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The fuel PUMP is only a small part of the fuel SYSTEM. The biggest baddest pump in the world won't work if the system doesn't. It all has to work together. Bigger lines, hold more volume and the column of fuel is harder to move in a G situation, so you need more pump. Smaller lines help that, but won't supply the volume. More pressure is NOT the answer. Pressure just aerates the fuel, which is NOT a good thing. Your fuel system should supply the volume of fuel you need and not need more than 5 psi at the carb to do it. If 5psi of regulated pressure at the carb, does not supply enough fuel...........you need more volume Exactly what has been said here! 
If it ain't broke fix it anyway!
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Re: Fuel Volume vs. Fuel Pressure
[Re: justinp61]
#1935184
10/19/15 08:28 PM
10/19/15 08:28 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
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Posts: 19,318
State of confusion
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I meant a pic of the fuel entrance where the supply line hooks up to.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Fuel Volume vs. Fuel Pressure
[Re: justinp61]
#1935216
10/19/15 09:03 PM
10/19/15 09:03 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
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Posts: 19,318
State of confusion
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That`s the money shot..........see that nasty wall the fuel has to go through? The QF entries are blended and smooth.....no walls baffles etc......Thankxx man.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Fuel Volume vs. Fuel Pressure
[Re: polyspheric]
#1935224
10/19/15 09:11 PM
10/19/15 09:11 PM
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Joined: Nov 2010
Posts: 3,698
jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,698
jersey
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I did talk with a tech from Aeromotive
To a hammer, everything is a nail.
When has a manufacturer not said "you need a big pump"?
For those of you who still think that the car is faster in direct proportion to the amount of money spent (i.e., billet = power), I'll quote David Vizard (slight editing) on fuel supply requirements, not as line size but in terms of how much must be actually received at the carb inlet.
"Brake Specific Fuel Consumption (as shown in dyno tests): how many lbs. of fuel per hour per horsepower the motor needs; .5 lbs./hr is a safe minimum figure.
.5 lbs/hr/hp × 500 hp = 250 lbs./hr
add 50% safety margin for restrictions, inertia, bends, etc. = 375 lbs./hr
gas = 6 lbs. per gallon
62.5 gallons per hour is more than sufficient for a 500 hp motor."
Sooo... your BG 400 pump is JUST RIGHT for that 3200 hp motor... and he also says a vacuum secondary carb is perfect for a drag race car, because it acts like two carbs in one.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Fuel Volume vs. Fuel Pressure
[Re: jcc]
#1935368
10/20/15 12:48 AM
10/20/15 12:48 AM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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Since we are using golf balls, water cisterns and all kinds of other useless crap, in relation to race car fuel systems.........how about this. I don't have any type pump on my house and I have good pressure and volume in the shower.........so hmmm...........hell maybe we don't even NEED fuel pumps.........LOL!!! Obviously my cistern analogy went over your head. I did however exempt you from the golf ball analogy. And sorry you couldn't form a legit question to my comment I could respond to. No, it didn't go over my head and I felt no need to ask you a question from that meaningless stuff you posted, because it is not relevant to the discussion at hand. You think it is...fine, I just don't care to talk about theory and equations, because I know what a race car needs and how to properly set up a fuel system that works right. You want to flex your engineering knowledge, fine, knock yourself out. I will opt for proven results that work As far as regarding Vizards word as the gospel of all things automotive...........I will refrain until he builds or tunes an actual car that runs fast, instead of peppering us with theory and dyno numbers
Last edited by Monte_Smith; 10/20/15 12:53 AM.
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Re: Fuel Volume vs. Fuel Pressure
[Re: tboomer]
#1935378
10/20/15 01:15 AM
10/20/15 01:15 AM
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Joined: Oct 2007
Posts: 4,219
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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I will refrain until he builds or tunes an actual car that runs fast, instead of peppering us with theory and dyno numbers
That happened about 50 years ago.
I love how people don't trust those "science", "physics", and "chemistry" things, instead they appreciate "real world experience". LOL!
Boffin Emeritus
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Re: Fuel Volume vs. Fuel Pressure
[Re: polyspheric]
#1935442
10/20/15 09:05 AM
10/20/15 09:05 AM
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Joined: Nov 2010
Posts: 3,698
jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,698
jersey
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I will refrain until he builds or tunes an actual car that runs fast, instead of peppering us with theory and dyno numbers
That happened about 50 years ago.
I love how people don't trust those "science", "physics", and "chemistry" things, instead they appreciate "real world experience". LOL! 50 years ago "science" and "physics" said it would be impossible for a piston driven vehicle to exceed 180mph in a 1/4 mile.... I'll take real world experience.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Let not the pot stop boiling