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#1
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Best mechanical fuel pump
I have a 461cid putting out 500hp and 562ftlbs. I’m looking for a new mechanical fuel pump for it. I can’t find the receipt for the old one so I don’t remember what brand it was and it worked great. It’s feeding an 850cfm Q-jet. Anyone have a suggestion on a good pump?
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Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
#2
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I prefer the RobbMc fuel pumps. They are rebuildable. They come in two sizes, 550hp and 1100hp. The first link is the 550hp one , second link is the 1100hp one.
http://www.robbmcperformance.com/pro...ontiac550.html http://www.robbmcperformance.com/pro...ntiac1100.html Home for RobbMc---- http://www.robbmcperformance.com/products.html
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
#3
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I was thinking about running the RobbMc Gen 2 Powersurge so I can use the stock mechanical to supply the fuel and still be quiet.
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Jim Moshier 1971 Grand Prix 462ci SD Performance 6x heads 1962 Catalina 389 1968 Firebird 400-455 I haven't decided "If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan |
#4
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I've seen my fair share of "dairy queen" cruisers with engines that should make 500 hp plus fall flat on their face at the 1/8th mile at the dragstrip. The usual cause is a mechanical pump.
I shake my head every time I see these threads. Guys will spend countless hours planning their builds...long cam discussions..trying to squeeze extra power out of their builds and then run a mechanical pump on a higher horsepower build. Doesn't make sense to me..running an engine lean isn't good.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#5
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Quote:
I had the Robb 550. Fell on its face with street tires. Switched to the 1100 with a vapor return. That made it down the 1/8 on street tires. But when I put drag radials on it this year, the falling on its face returned. I may have been able to patch that issue if I had run the tank slap full. At the end of the day I bought a Tanks inc LS swap tank used locally, converted my Robb MC regulator to return style, and the problems went away. At least in the 1/8th. I think the fallacy is that its easy to feel like staying mechanical is cheaper. For me, and for others with similar experiences, I spent more time and money trying to get the big mechanical to work, than if I would have just gone with the in tank pump to begin with.
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1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
#6
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Quote:
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
#7
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Quote:
Im using -8 to a 1/2 stainless feed line, and -8 return all the way back. The regulator is the same Robb Mc regulator I was using when I was mechanical, but it was converted over to a return style.
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1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
#8
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If you are dead set on mechanical I will second Robb Mc. If you are going to do any racing I would go straight to electric. I’m sure it’s beating a dead horse, but it’s so much less of a headache.
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1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
#9
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The RobbMc 1100 is the highest flowing mechanical pump at higher output pressures made for a Pontiac bar none.
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
#10
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My brother's car makes 530 Hp and uses a Carter 120 GPH mechanical pump with no fuel starvation issues.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#11
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does he run the car at the track? what are the times? im about the same HP level & doing low 11's & the carter/edelbrock type pumps definitely had starvation issues at those times with a q-jet carb.
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#12
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No track runs just WOT through the gears on the street with an AFR meter.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
The Following User Says Thank You to AG For This Useful Post: | ||
#13
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Big difference in the amount of G force...
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#14
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Thanks, it’s a street car. I found my receipt and it was a RobbMc I had on there. It worked great! 😎👍
__________________
Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
#15
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I use the Carter street pump with no issue.Tom
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#16
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That’s why I will never leave this site, always get a good answer and usually promptly. Thanks guys! 👍
__________________
Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
#17
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on the street?
the carter/edelbrock pumps will be ok on the street at ~500hp, its when you get to teh track with good traction & get into the 11's that the issues can happen. |
#18
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I haven't had huge success with mechanical pumps when approaching the 500hp mark.
Using bone stock pumps and fuel lines, I've gone mid 12's at 108-ish mph with a completely stock fuel system and ~400hp. But as the car makes more power it's not enough. Using either a holley aftermarket mechanical pump or a RobbMC would get you by at 500 HP on the street but I wouldn't expect stellar performance at the track. I've done the Holley pumps and they are "okay". Friends have used RobbMC mechanical pumps to 11.30's at 116+ mph with bigger 1/2" lines but report low fuel pressure at the end of the track (less than 3 lbs.) Not ideal. As mentioned, if racing in mind, even just once or twice a year, I'd recommend an in tank electric setup, even on a street cruiser. OEM reliability and excellent fuel supply under all conditions. I recently went through 3 Carter stock replacement mechanical pumps before I finally got a good one that ran the car more than 3 miles from the house before it died on one of the vehicles here LOL So I'm liking the mechanical pumps less and less for reliability reasons these days, let alone WOT fuel supply. If I'm going to run one, it's definitely going to be a rebuildable unit, with a spare kit in the trunk |
#19
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Is this not the street section?Tom
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#20
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It is, but this isn't really like running a big snotty cam that could have some detriment on the street. An in tank fuel pump is going to be better on any kind of track obviously, but is as good if not better on the street too.
I wouldn't say my car is a race car, but it finds its way to the track a few times a year. Not very fun falling flat on your face.
__________________
1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
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