nice accurate explaination. thanks. be aware the holley red is LOUD and has
failed on me a couple of times (clogged with bits of it internally breaking
down - blew fuse - worked after cleaning). I prefer Carter now. quieter,
better mountings, more choice of pumps, smaller, more reliable, less pressure
drop at high flow.
also a pressure regulator helps. you can have a 7psi pump and restrict the
carb input to 5-6 psi.
On Aug 2, 2011, at 10:37, "Rense, Mark (GE, Appl & Light)" <mark.rense@ge.com>
wrote:
> Andy,
> The PRESSURE RATING (PSI) on a pump is based on static pressure, and
> that is the pressure the pump develops at zero flow. As soon as liquid
> begins to flow, the pressure drops. The FLOW RATE (GPH) is the maximum
> volume of fluid the pump can flow at a zero pressure drop. Since in the
> real world all pumps see some level of resistance to flow, the actual
> flow rate is lower than the rating. Some pumps come with a flow rate
> curve which plots the flow rate as a function of back-pressure, Holley
> rates their pumps at both zero and 5 psi.
>
> There are many things that affect the true system flow rate including
> tubing diameter, bends in the tubing, and filters. All these are
> restrictions and slow the flow rate. In a carburetor-based system, the
> pump feeds on a demand basis, when the carb floats open the needle
> valve, fuel flows until the bowls are full. The float system is designed
> to work at low pressures, 1 to 5 psi, so the pump needs to have a flow
> rate that is capable of supplying enough fuel flow to keep the carb from
> starving.
>
> The SU that is OEM on the Tiger is barely adequate for the stock 260,
> when you add horsepower the engine's demands can easily out-pace that
> pump's ability to feed the system. I recommend looking at a high
> performance pump that flows at least 80 GPH if you are running an engine
> with over 200 hp. The Holley Red pump has worked well for me on a
> variety of SBF applications including mild strokers. If you are running
> track days and pushing over 300 hp then the next step beyond that pump
> is recommended.
>
> Bugz
>
> -----Original Message-----
> From: awtiger
> Sent: Tuesday, August 02, 2011 11:59 PM
> To: tigers@autox.team.net
> Subject: [Tigers] Fuel pump flow rate question
>
> Hey, guys:
>
> Can any of you engineer/mathmetician types out there educate me on how
> to figure how many gallons-per-hour a certain psi-rated fuel pump flows?
> Specifically, I'm wondering how many GPH a 2 to 3 psi fuel pump would
> flow.
> Can anybody send me to school?
>
> Thanks a million,
> Andy Walker
> Edmond, OK
> B382001600LRXFE
> TAC #740
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