How much fuel is required for a 511 with a T ram and twin 750's

Bluefish · Apr 2, 2020

I currently have a 1100 Dominator on my 511 and the fuel system seems sufficient with a 160gph pump, pumping 2 gallons in a minute after the regulator equaling 120gph. Would this be enough fuel flow for a tunnel ram set up? Thanks

Demonic · Apr 2, 2020

What size fuel line from the tank? You would need 3/8" or 1/2" to avoid starvation at max rpm, the factory 5/16" may not be enough.

Bluefish · Apr 2, 2020

Demonic said:
What size fuel line from the tank? You would need 3/8" or 1/2" to avoid starvation at max rpm, the factory 5/16" may not be enough.

I have a -8 line to the regulator, -8 return and a -8 from reg to carb.

HEMI-ITIS · Apr 2, 2020

The important question is how much HP will you produce?

dvw · Apr 2, 2020

.5 lb of fuel/HP/hr is the number you need. 2 carbs are actually easier. They have more bowl capacity. Keeps them from running dry longer. Single Quadrajet is the toughest.
Doug

33 IMP · Apr 2, 2020

I remember reading that it was easier to keep two holleys on a tunnel ram fed, than a big single four barrel. Twice as many needles and seats, twice as many fuel bowls to keep reserve fuel in
Edit: dangit, Doug beat me by a minute AGAIN!.

Bluefish · Apr 2, 2020

dvw said:
.5 lb of fuel/HP/hr is the number you need. 2 carbs are actually easier. They have more bowl capacity. Keeps them from running dry longer. Single Quadrajet is the toughest.
Doug

Looks like 350#/hr with 700hp. I’ll have to reduce that to 10 seconds. Thanks guys

Bluefish · Apr 2, 2020

Bluefish said:
Looks like 350#/hr with 700hp. I’ll have to reduce that to 10 seconds. Thanks guys

Looks like 56gph and I’m pumping 120. I think I have plenty.

Budnicks · Apr 2, 2020

I use to run an ol' Holley blue pump 120gph
& 1) dual port bypass reg.
with -8 AN to the 10 micron filter, then to the pump, then to the reg,
(IIRC a -6 AN return)
all Holley parts, Russel hoses/fittings
1) 90* fitting out of the pickup,
the rest sharpest turn 'elbow' fitting was a 45*
seemed to flow better than when it had a few more 90* fittings
it was 2 x 660cfm
(polished knife edged blades, shallow screws, carbs flowed like 710cfm each)
center squirters/Tunnel ram carbs, all 8 barrels opening at once
seemed ok, it was on a LS7 468cid BBC ran into the high 8's
made in the neighborhood of 900hp, back in the 80's
seemed good even thru the lights,
IIRC never dropped below 6psi

I'd set them at 7psi flowing, Vinton needle & seats...

bought & carried a new Blue pump for a spare
& changed them out regularly, just to be safe

before I went to my sponsors ERC/CNC billet pump stuff,
precursor to the Barry Grants pumps

66Satellite47 · Apr 19, 2020

Gee Bud, you must have been right on the edge for 1 Blue pump. In those days I ran 2 Blue pumps on 2x650 DP tunnel, not for added flow, but reliability. Switched to a single Mallory 140. Plenty of flow there.

Budnicks · Apr 20, 2020

66Satellite47 said:
Gee Bud, you must have been right on the edge for 1 Blue pump. In those days I ran 2 Blue pumps on 2x650 DP tunnel, not for added flow, but reliability. Switched to a single Mallory 140. Plenty of flow there.

yeah I'm sure it was too...
never burned anything up, fuel volume wise anyway

I kind of cheated, had a smaller return line #6
seemed to keep the fuel in the bowls
most the time they recommended the same size return line as feed

when the bigger pumps started coming out (like the Barry Grants)
I ran CNC pumps, with #10-#12 feed no 90's,
only straight, Y's or 45's fully flowed, chamfered & an #8-#10 return
they would produced 2-3-4 time as much fuel as I ever needed,
even with 1300+hp NA
even for dual 1350 cfm with bowl extensions
or even 4) x 2bbl 700+cfm 'split dominators'
most of it, all bypassed back to the cell,
IMO that was the critical setting
I always ran the float bowl levels a tad higher levels
(like 2 flats more -higher- after it flowed out of the float site level ports or
bottom of the glass sites, to make up for more demand when running WOT)
than Holley, BG or QA1 recommended too
also really need to have good extended longer vent tubes
or hose between the 2 vents per carb, with a 1/2" notch cut in, it's middle

I always set my stuff regulator/s (bypasses & pressures) flowing,
never static or deadheaded, still do even on my street-strip cars today

How much fuel is required for a 511 with a T ram and twin 750's

Bluefish

FBBO Gold Member

Demonic

Well-Known Member

Bluefish

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HEMI-ITIS

STREETER on LI

dvw

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33 IMP

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Bluefish

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Bluefish

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Budnicks

Jackstand racer #1 & proud of it, Sir Posts A Lot

66Satellite47

Well-Known Member

Budnicks

Jackstand racer #1 & proud of it, Sir Posts A Lot

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