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Re: Fuel flow thru reg?
[Re: Clanton]
#1453761
06/16/13 03:57 PM
06/16/13 03:57 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:
Wont the line to the carbs be the restriction also? 
Actually the needle and seat(.110 is stock in most )
is the restriction point)
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Re: Fuel flow thru reg?
[Re: bigtimeauto]
#1453764
06/16/13 07:09 PM
06/16/13 07:09 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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From the testing we did, BG 280 @ 13.5v thru a Holley 12-803 reg set @ 7 psi it took 28 sec to flow 1 gal, Same set up but with BG reg set @ 7 psi took 19 sec to fill 1 gal, Tested the pump pressure @ 18 psi dead headed, The problem which is new from the last 2 runs is the truck is launching better, 1.39 & 1.35 from 1.65 ave but after the 60ft mark it falls on its face dropping from 6900 to 4500 then hunts up and down to 5500, This was with the Holley reg, We run .120 needles on either a bg 850 annular or a bg 1000 race demon and the annular was the 1.35 60ft, both carbs ran out of fuel @ the 60ft mark, I have swapped out regs to the BG but have no way to test till next week end @ the track , I am not sure if it is a G force problem or a reg volume problem from the difference in faster 60ft times, All opinions welcome, Thankx Craig
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Re: Fuel flow thru reg?
[Re: skrews]
#1453766
06/16/13 10:11 PM
06/16/13 10:11 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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Quote:
You running jet extensions in the rear ? And no rear power valve ? You knew somebody was going to ask . 
Yes & yes, From the best I could tell we were nosing over @ the 175ft mark all season and the rpm would not go much past 7k before this problem started, most likely the small reg, The truck never launched well but made it up mid track, now we are leaving hard and falling flat, The crazy thing is as bad as we are now running we only lost 2 to 3 tenths, it seems that the launch carries the truck all the way thru 200ft.
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Re: Fuel flow thru reg?
[Re: skrews]
#1453767
06/16/13 10:12 PM
06/16/13 10:12 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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you running a cut open hose from bowl vent to bowl vent? What you are describing is a rich stumble not lean.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453769
06/16/13 10:23 PM
06/16/13 10:23 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
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Plymouth Meeting, PA
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Quote:
No hose on the vent tubes, I will get on it the tubes are kinda short, That never crossed my mind, Thankx 
and make sure your floats are set with the car running!
here is a pick of the hose, cut about 1" open:
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453776
06/16/13 11:01 PM
06/16/13 11:01 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
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Posts: 19,317
State of confusion
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Mine doesn`t move but maybe a 1/4 lb if that from idle through 7000.........Magnafuel 300 pump and their 2-port reg. Before blameing the reg have you checked for restrictions before the pump? Pre-filter, bends etc.
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 flow thru reg?
[Re: Thumperdart]
#1453781
06/16/13 11:30 PM
06/16/13 11:30 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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Quote:
Quote:
We just ran all new 1/2 inch line from the pump to the reg, fuel tank on top of pump with a straight drop about 10 to 12 inches to the pump feed which is 1/2 also. Removed all filters for the tests, Pump seems a bit louder than normal?
My pump made some horrible noises right before it locked up and burned down.......Which pump do you run?
BG 280
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453782
06/16/13 11:32 PM
06/16/13 11:32 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
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Plymouth Meeting, PA
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Just buy the magnafuel 500, for the money difference its a no brainer. Your probably going to want to go faster at some point anyway.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Fuel flow thru reg?
[Re: Cab_Burge]
#1453789
06/17/13 10:16 AM
06/17/13 10:16 AM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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I retested the BG 280 this morning and had the same results as yesterday, gal in 19 secs & 7 psi, I let it run dead headed @ 18 psi for 15 min and the pump motor was a little warm but not hot, amp draw was 13 to 14 @ 13.5 volts , pump still a bit loud, When testing I removed one flex line from the fuel log feeding the primary bowl, The fuel blasts out the line like a fire hose, This is a 6an flex line that y,s together after the reg, From looking @ the fuel flow I cant see how the float bowl cant maintain the level from the amount of fuel flowing out the line, took the needle out and checked for a clog, All looked good, Could it be that the float is not reacting fast enough? The old needles were .110 & I went back with .120s thinking the bowl would fill faster, The Holley reg has a .220 restriction the .120 needles x 2 =.240, The BG reg is larger but I don't know the size, The fuel log is attached to reg with a inside dia of .340 @ the entrance to the log than y,s off to the bowels, is this too small?, a # 8an line will flow more volume @ 7 psi, Its just hard to figure that this small block can need this much fuel, in the past the engine consumed 1 gal in the 4 mins we ran to make a pass, that's from the pits to staging, a 200ft blast and back around to the pits, That's been consistent for the past few years, Anyhow has anyone had a problem with a 6an fuel log being too small?
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453791
06/17/13 11:29 AM
06/17/13 11:29 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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The #6 line wouldnt be the problem BUT the Y might be on the small side... all the AN fittings I use I normally drill them out some so its just inside the seating area
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Re: Fuel flow thru reg?
[Re: bonefish]
#1453792
06/17/13 11:52 AM
06/17/13 11:52 AM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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Quote:
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Is it 2 / 6an lines, one from each port from the reg, or one 6an split to 2 bowels?
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453793
06/17/13 12:13 PM
06/17/13 12:13 PM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
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s.w.fl
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Quote:
Quote:
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Is it 2 / 6an lines, one from each port from the reg, or one 6an split to 2 bowels?
two seperate lines,one from each side of the reg.
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Re: Fuel flow thru reg?
[Re: Thumperdart]
#1453795
06/18/13 03:14 AM
06/18/13 03:14 AM
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Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
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master
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Posts: 2,932
Finalnd, Perkele
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The restriction that all the fuel goes through in a basic Holley regulator is what, 1/16"? It is not enough to be able ot correctly feed todays high performance engines, I would say it's only good for about 600 hp. The old pro stockers didnät make that much power, and they had one reg for each carb.
Plynouth VIP '67 TT IC EFI
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Re: Fuel flow thru reg?
[Re: emarine01]
#1453800
06/19/13 02:35 PM
06/19/13 02:35 PM
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Joined: Aug 2003
Posts: 43,173
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
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Quote:
2 6an lines one off each reg port to each bowl seems to have solved the problem, But she source of the problem was a kinked line @ the 90* bend to the front bowl that was hidden by the SS cover on the fuel line, When I did the flow testing I dropped that line and straightened out the 90 to go in the bucket thus fixing the kink, I found the kink from cutting the line to shorten it  This was nothing but a frustrating fire drill where the testing made no sense, Thankx to all for the help.
Lots of gremlins out there, the simple stuff will kill you trying to find it  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Same thing on regulators 
