PRESSURE AND VOLUME
#1634159
06/15/14 07:26 PM
06/15/14 07:26 PM
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Joined: Dec 2003
Posts: 531
USA
540DUSTER
OP
mopar
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OP
mopar
Joined: Dec 2003
Posts: 531
USA
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Which regulator will supply more volume of fuel? The fuel pump stays the same in both tests,which is deadheaded and puts out 18 psi to the regulator.The first test the regulator is set to 7psi.The second test the regulator is set at 5psi. Which regulator will supply more fuel in volume? 
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Re: PRESSURE AND VOLUME
[Re: 540DUSTER]
#1634160
06/15/14 10:33 PM
06/15/14 10:33 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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If unrestricted with the same size opening outlet on both tests the higher pressure should flow more volume. I had a eye opening expereince several years back on unrestricted being less GPM than having a restriction in the fuel flow line  I had swapped my Magnafuel 275 pump for a Magnafuel 300 pump do to running out of fuel according to my widenban, I had conducted both tests with the regulator set at 7.5 lbs on my six pak Duster motor, I flowed all three lines into a bucket for 20 seconds on both pumps, negligable differences in volume I called Magnafuel and they said to add a restrictor into the lines so the 300 pump would have more resistance and that would increase the volume  It did, I hooked up one of the carb.lines to one carb and that dang 300 pump almost double the volume on the next tests through two #6 AN lines instead of three  Lots of gremlins out there, I ended up finding out the large pumps like both Magnfuels don't like a fine(less than 80 microns) pre pump fuel filter in the line. I ended up removing the 10 micron fuel filter between the pump and the gas tank and put in a 80 micron prefilter there and moved the 10 micron filter between the pump and the regulator  That works slick   IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: PRESSURE AND VOLUME
[Re: 540DUSTER]
#1634162
06/16/14 02:06 PM
06/16/14 02:06 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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Quote:
Cab,I hear what your saying,but you didn't change the regulator setting.
The 275 pump was set at the factory to have , I think, around 17 lbs towards the reg, I never verified that, the 300 was suppose to be set at 23 lbs to the reg Once I hooked the one line up to one of the carbs the volume went way up with the 300 pump Try flow testing yours with the different pressures and let us know what you find out I ended up turning the pressure down to 5.5 lbs later after reading a post from Monty about the higher pressures causing foam from the needles and seats, I didn't see the car slow down or pickup after that test .I think I did a pressure test years ago to compare volume when I was using two small blue Holley regs. in paralel, one fed the front of the carb and the other fed the rear bowl. It seems to me that it flowed more volume at 9.0 lbs than they did at 7.5 lbs, maybe not That was a long time ago,CRS 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: PRESSURE AND VOLUME
[Re: Cab_Burge]
#1634163
06/16/14 03:03 PM
06/16/14 03:03 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Quote:
Quote:
Cab,I hear what your saying,but you didn't change the regulator setting.
The 275 pump was set at the factory to have , I think, around 17 lbs towards the reg, I never verified that, the 300 was suppose to be set at 23 lbs to the reg Once I hooked the one line up to one of the carbs the volume went way up with the 300 pump Try flow testing yours with the different pressures and let us know what you find out I ended up turning the pressure down to 5.5 lbs later after reading a post from Monty about the higher pressures causing foam from the needles and seats, I didn't see the car slow down or pickup after that test .I think I did a pressure test years ago to compare volume when I was using two small blue Holley regs. in paralel, one fed the front of the carb and the other fed the rear bowl. It seems to me that it flowed more volume at 9.0 lbs than they did at 7.5 lbs, maybe not That was a long time ago,CRS
In the dayz of barely gettin by pumps we had to up the pressure to squeak out more power but at the cost of bowl foaming now we have bad azz pumps and we`re finding out that less pressure is more consistent w/less foam and more fuel..............I run 6 psi on my 300 pump and it works great so far............
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: PRESSURE AND VOLUME
[Re: Thumperdart]
#1634164
06/16/14 08:33 PM
06/16/14 08:33 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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Quote:
Quote:
Quote:
Cab,I hear what your saying,but you didn't change the regulator setting.
The 275 pump was set at the factory to have , I think, around 17 lbs towards the reg, I never verified that, the 300 was suppose to be set at 23 lbs to the reg Once I hooked the one line up to one of the carbs the volume went way up with the 300 pump Try flow testing yours with the different pressures and let us know what you find out I ended up turning the pressure down to 5.5 lbs later after reading a post from Monty about the higher pressures causing foam from the needles and seats, I didn't see the car slow down or pickup after that test .I think I did a pressure test years ago to compare volume when I was using two small blue Holley regs. in paralel, one fed the front of the carb and the other fed the rear bowl. It seems to me that it flowed more volume at 9.0 lbs than they did at 7.5 lbs, maybe not That was a long time ago,CRS
In the dayz of barely gettin by pumps we had to up the pressure to squeak out more power but at the cost of bowl foaming now we have bad azz pumps and we`re finding out that less pressure is more consistent w/less foam and more fuel..............I run 6 psi on my 300 pump and it works great so far............
Thumper, what regulator are you using. And is your 6 psi at idle or full throttle? Thanks........
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: PRESSURE AND VOLUME
[Re: D-50]
#1634165
06/16/14 10:14 PM
06/16/14 10:14 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Quote:
Quote:
Quote:
Quote:
Cab,I hear what your saying,but you didn't change the regulator setting.
The 275 pump was set at the factory to have , I think, around 17 lbs towards the reg, I never verified that, the 300 was suppose to be set at 23 lbs to the reg Once I hooked the one line up to one of the carbs the volume went way up with the 300 pump Try flow testing yours with the different pressures and let us know what you find out I ended up turning the pressure down to 5.5 lbs later after reading a post from Monty about the higher pressures causing foam from the needles and seats, I didn't see the car slow down or pickup after that test .I think I did a pressure test years ago to compare volume when I was using two small blue Holley regs. in paralel, one fed the front of the carb and the other fed the rear bowl. It seems to me that it flowed more volume at 9.0 lbs than they did at 7.5 lbs, maybe not That was a long time ago,CRS
In the dayz of barely gettin by pumps we had to up the pressure to squeak out more power but at the cost of bowl foaming now we have bad azz pumps and we`re finding out that less pressure is more consistent w/less foam and more fuel..............I run 6 psi on my 300 pump and it works great so far............
Thumper, what regulator are you using. And is your 6 psi at idle or full throttle? Thanks........
I`m using the recommended Magnafuel for the 300 pump but don`t have a part # handy............ Idle is the same as wfo......... 
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: PRESSURE AND VOLUME
[Re: Thumperdart]
#1634166
06/16/14 10:22 PM
06/16/14 10:22 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
|
Quote:
Quote:
Quote:
Quote:
Quote:
Cab,I hear what your saying,but you didn't change the regulator setting.
The 275 pump was set at the factory to have , I think, around 17 lbs towards the reg, I never verified that, the 300 was suppose to be set at 23 lbs to the reg Once I hooked the one line up to one of the carbs the volume went way up with the 300 pump Try flow testing yours with the different pressures and let us know what you find out I ended up turning the pressure down to 5.5 lbs later after reading a post from Monty about the higher pressures causing foam from the needles and seats, I didn't see the car slow down or pickup after that test .I think I did a pressure test years ago to compare volume when I was using two small blue Holley regs. in paralel, one fed the front of the carb and the other fed the rear bowl. It seems to me that it flowed more volume at 9.0 lbs than they did at 7.5 lbs, maybe not That was a long time ago,CRS
In the dayz of barely gettin by pumps we had to up the pressure to squeak out more power but at the cost of bowl foaming now we have bad azz pumps and we`re finding out that less pressure is more consistent w/less foam and more fuel..............I run 6 psi on my 300 pump and it works great so far............
Thumper, what regulator are you using. And is your 6 psi at idle or full throttle? Thanks........
I`m using the recommended Magnafuel for the 300 pump but don`t have a part # handy............ Idle is the same as wfo.........
I was wondering if my Holley Billet regulator was the problem. I can set it at 6 idling and it will keep creeping up and when I rev it up it starts going down below 6.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: PRESSURE AND VOLUME
[Re: 540DUSTER]
#1634170
06/17/14 05:02 PM
06/17/14 05:02 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Which regulator will supply more volume of fuel?
The fuel pump stays the same in both tests,which is deadheaded and puts out 18 psi to the regulator.The first test the regulator is set to 7psi.The second test the regulator is set at 5psi.
Which regulator will supply more fuel in volume?
The 5 psi setting(output pressure) will flow more
fuel with the 18 psi input
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Re: PRESSURE AND VOLUME
[Re: 540DUSTER]
#1634172
06/17/14 06:20 PM
06/17/14 06:20 PM
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Joined: Jan 2003
Posts: 9,982
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,982
Frostbitefalls MN (Rocky&Bullw...
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I don't see where the input pressure would make any difference as long as it can keep the regulator supplied adequately. The regulator does just that, reduces pressure to the set 5 or 7 psi. So at that point it is a constant value, based on the size of the smallest restriction, the needles and seats. 5 psi or 7 psi (more pressure, more flow, which there is a formula for) will flow xx amount out of that small restriction, provided the regulator is doing a perfect job. This is assuming the feed line and regulator to carb lines are more than adequate.
Last edited by gregsdart; 06/17/14 06:22 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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