|
Re: Bad night at the track "UPADATE"
[Re: 70dusterjohn]
#438358
08/15/09 01:38 PM
08/15/09 01:38 PM
|
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
|
You have to watch that you have adequate atmospheric pressure (venting) on your fuel tank/cell whenever you increase the volume of the pump, the inlet side of the pump should really (ideally) be gravity fed (it really shouldn't "suck"), 2 thinks would cause a pressure differential the first is a restriction the secongd is a lack of atmoshpheric pressure on the fuel in the tank. Increasing the flow rate can amplify a problem you didn't know you had until you made the swap. Don't forget G-forces have an effect on your effective flow rate, G forces effectively multiply the mass of the fuel in terms of GPM or Pounds/hr that's why harder launching cars have much bigger pumps than would need to run on a Dyno. Check the obvious things first....don't throw the baby out with the bathwater. 
|
|
|
Re: Bad night at the track
[Re: Cab_Burge]
#438359
08/15/09 02:37 PM
08/15/09 02:37 PM
|
Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
|
Cab`s right.........I don`t remember the exact numbers but my flow #`s went WAY up by adding a second filter but have since dumped the frams and use a Mallory 500 series canister filter. Somethings not right and like stated, I would disconnect the fuel lines at the carb and see how many seconds it takes to flow a gallon......it should be around 20-25 seconds I would think at your et.  Good luck.
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.....
|
|
|
Re: Bad night at the track
[Re: 70dusterjohn]
#438368
08/15/09 09:37 PM
08/15/09 09:37 PM
|
Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
|
master
Joined: Oct 2004
Posts: 8,165
Left Coast
|
Quote:
Nope It had fuel in it, I even put more in it.. I am running a fram filter.  I was thinks that might be it. But any how its got two -8 off the tank to a Y then to the fram fiter, to the pump with -8 and to the front of the car with -8 to the regulator, and two -8s to the carb.. 
IMO Fram fuel filters are junk. Further more they are not intended to be suction side filters. I am not at all surprised you are having problems. Your pump is cavitating and will soon be ruined if it isn't already. You need to get a suction side filter to keep crap out of your pump and a pressure side filter for the finer stuff that gets into your carb. RobbMc from this board has everything you need.
|
|
|
Re: Bad night at the track "UPADATE"
[Re: Dodgem]
#438369
08/16/09 01:58 PM
08/16/09 01:58 PM
|
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
|
New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
|
Quote:
I heard Fram filters cause a big restriction??
IMO Fram fuel filters are junk.
Point of reference. My Mallory 140 sucked 1 gallon in 25 seconds through my OLD Fram and 1/2" lines. That's free-flow to the regulator. I changed to a stated 500gpm stainless mesh canister filter and it flowed exactly the same.
It ran 10.39@128 on E53 last night but was a little rich on that run with 94/95 jets.
|
|
|
Re: Bad night at the track "UPADATE"
[Re: @#$%&*!]
#438371
08/16/09 07:12 PM
08/16/09 07:12 PM
|
Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
|
master
Joined: Oct 2004
Posts: 8,165
Left Coast
|
Quote:
Quote:
I heard Fram filters cause a big restriction??
IMO Fram fuel filters are junk.
Point of reference. My Mallory 140 sucked 1 gallon in 25 seconds through my OLD Fram and 1/2" lines. That's free-flow to the regulator. I changed to a stated 500gpm stainless mesh canister filter and it flowed exactly the same.
It ran [Email]10.39@128[/Email] on E53 last night but was a little rich on that run with 94/95 jets.
THE CORRECT way to plumb a high perf fuel system-any HP fuel system is to use a 100 micron filter before the pump and a 10 micron after. You also need at least a number 10(12 is better for some bigger pumps) or two number 8's y'd on the inbound into the 100 micron filter then outbound to the pump. Anything other than this may well cause the pump to cavitate and by your description that exactly what your's is doing. If you plumb your present pump correctly it probably will do the job.
|
|
|
Re: Bad night at the track
[Re: BobR]
#438372
08/16/09 08:50 PM
08/16/09 08:50 PM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Quote:
Nope It had fuel in it, I even put more in it.. I am running a fram filter. I was thinks that might be it. But any how its got two -8 off the tank to a Y then to the fram fiter, to the pump with -8 and to the front of the car with -8 to the regulator, and two -8s to the carb..
IMO Fram fuel filters are junk. Further more they are not intended to be suction side filters. I am not at all surprised you are having problems. Your pump is cavitating and will soon be ruined if it isn't already. You need to get a suction side filter to keep crap out of your pump and a pressure side filter for the finer stuff that gets into your carb. RobbMc from this board has everything you need.
Took the words out of my mouth.  
|
|
|
Re: Bad night at the track "UPADATE"
[Re: BobR]
#438373
08/16/09 09:08 PM
08/16/09 09:08 PM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Quote:
Quote:
I heard Fram filters cause a big restriction??
IMO Fram fuel filters are junk.
Point of reference. My Mallory 140 sucked 1 gallon in 25 seconds through my OLD Fram and 1/2" lines. That's free-flow to the regulator. I changed to a stated 500gpm stainless mesh canister filter and it flowed exactly the same.
It ran [Email]10.39@128[/Email] on E53 last night but was a little rich on that run with 94/95 jets.
THE CORRECT way to plumb a high perf fuel system-any HP fuel system is to use a 100 micron filter before the pump and a 10 micron after. You also need at least a number 10(12 is better for some bigger pumps) or two number 8's y'd on the inbound into the 100 micron filter then outbound to the pump. Anything other than this may well cause the pump to cavitate and by your description that exactly what your's is doing. If you plumb your present pump correctly it probably will do the job.
Inlet plumbing always needs to be bigger(2 sizes) on all fluid pumping systems. Gas pumps need to be gravity fed because gasoline cavitates real easy.
|
|
|
|
|
