Can a 140 mallory fuel pump safely satisfy the fuel needs of a 700 hp 9 second car. If not what are the the big boys running. or what do you suggest?
I'm sure there's a formula out there somewhere, like less than 30 seconds to fill a gallon free flowing, but in my opinion, NO, the Mallory 140 is too small. Once you get over the 600hp level, the g forces should be pretty good, get a bigger pump with a bypass on it, or a good bypass regulator. I run an Aeromotive A2000, set at 20 psi at the pump, and regulated to 7 at the dominator carb. I think it flows around 300+ gph. a -10 from fuel cell up to the regulator, and 2 -8an to the carb. A bigger pump will not have to work as hard, will work better against G forces, and run cooler. At the high HP levels by going to a big pump, you are pretty much never going to have a fuel delivery problem. There are many different pumps to choose from, Aeromotive, Mallory (250), Mega Flow, just check out Jegs or Summit. I've gone 9.30s' at 140mph+ with a 1.32 60 foots, in a 3600 lbs. car, that's like 850 hp to the rear wheels. Sell the 140, or save it, it would work great mounted up front to feed a nitrous system........ Gary G.
If I heard correctly, Gary Laughlin runs a comp 140 pump running 9.40s making over 800 HP. Might want to check with him. I have seen alot of fast cars runing with just a Holley blue pump.
I had a 140 on JAGUICK and the plugs were bone white regardless of jetting and timing.....then it went KABOOM!!! 250 Mallory on there for new motor. Bruce
Im curious on the Mallory 140 too as thats what I'm running ... feeding a 556hp dyno'd motor o No: My plugs aren't "Jaguick" white however ....
Hey Alan On BQUICK it would surge (actually speed up) right at the traps running low 10s. Running out of gas. 250 cured it.....but never had an issue until it ran low 10s. High 10s were no problem. I'd say you are fine with the 140 as long as you have 1/2 in line and min of turns. Rock on! Bruce
I know someone who has run low 5's/ high 4's in the 1/8th with just a Holley blue pump. They were making 1000hp and then shooting nitrous on top of that.
The "rule of thumb" as I understand it is one gal. per hour (at 6 lbs of pressure) for every 5 horse example= 100 gph pump for a 500 hp motor. Higher pressure will increase available power, that is way a fuel injection set up can get away with a 50 gph but at 45-60 lbs. of pressure. To bad my carb will not handle my Holley volume max with out a regulator :Brow:
I run a Holley "black" 140 currently. I used the old blue pump for a long time and went into the 9s with it without ever having a problem. When it quit, I just upgraded a little.
I have the same thing going on ( but the kaboom) I have a holley black pump and I could take the jets out and the plugs (well with 100 jets) would still but white so up graded to a BG 220 with a bypass to the fuel cell its 20 psi to the reg. with a -10 feed -08 the the reg and -08 to the carb hope that fixes it...
The Mallory 140 will work well up to about 600 hp with a dead-head regulator. Up to about 750 hp with a return regulator and the bypass in the pump plugged. Of course this assumes the restrictions in the line are small. You will need 1/2" feed and return lines with 700 hp.
140 Terrance, my plugs looked good after running the other night. I am getting it caged and changing to 3.89 gears in the next month, so I will give you a call when we take it out again. Might be in Temple for the next test session though. I havent had a problem with the 140 pump yet. Shawn"hands free"
Fuel Pumps Hey guys alot of guys get the real white plugs and then they step up the jets but when they reach 100 jets and plugs are still white they think fuel pump to small i went through this to, all the time it was just to hot of a spark plug and after going colder i went down 5 or 6 jet sizes and got a good plug reading. before changing pumps i would try running a colder plug. and i think the 140 mallory will get you into the low 10s high 9s. i run a BG400 and i had a miss, thinking it might be fuel i hooked up my spare mallory 140 and the car went from running 9.60ss to 9.68 lost 1 mph so you can get away with it.my buddys regal ran a best of 9.04 @149.98 (500ci stage 4) 3100# with a holley blue (18# moroso spring) and a mallory 140 ,2 pumps into a y block 1/2 inch aluminum line to a mallory reg.so i hope this helps.later JOHN
Oh yah, something else to think about. I am a firm believer, if your going to use a small pump keep the line size to -8. The small pumps cant fill the bigger -10, -12 line with the G force. I remember reading along time ago, Warren johnson did some testing with line size and the bigger lines did not work, the fuel was too heavy under excelleration.
Now you have me wondering...I am using a sump welded in my stock tank with a Holley Blue pump. I haven't gotten my main line due to taking in all considerations. I was about to run -10 AN line up to the front to the regulator then -8 up to the carb.I an just trying to think ahead for when I do more upgrades(Aluminum heads,462 lower end etc) in the future and thats why the -10 choice.I really don't want tohave to re-upgrade the fuel line in the future,but it seems it may not need the bigger lines right now. I am looking at a 12 sec ride but want to see 11's in the next year. What would the overall suggestions be for my fuel line considering the above?? Please help so I can sleep at night again... :laugh:
I am a little confused on regulator types. When you talk about bypass regulators do you mean a regulator that goes on the end of the carb fuel line with a line back to the tank instead of fuel going into the regulator first then to carb? If this is the way bypass regulators work wouldn't the fuel line pressure be lowered to 7 psi or whatever the setting is all the way back to the pump? So wouldn't you be loosing the pumps high pressure to fight against the G force? Or am I missing something here. I am asking because I need to improve the fuel system on my car.
The bypass reg. returns to the tank in a loop mode to keep the pump and fuel cooler.some pumps bypass right from the pump to the tank if a non return style reg. is used.I have used both holley and mallory and have had excellent performance from the mallory stuff, it is a comp 250 pump #8 aeroquip line to a return style reg. and a # 10 line return to the tank the bigger return helps to stop pressure spikes in the feed line to the carb.
