Big Block mechanical pump for 800 Hp
#2439082
01/22/18 04:36 PM
01/22/18 04:36 PM
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Joined: Aug 2004
Posts: 3,392 cheshire, ct
davesmopars
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OP
master
Joined: Aug 2004
Posts: 3,392
cheshire, ct
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Does any body make Big Block mechanical pump that can support 800 hp? I know Race pumps did but only sell parts for them now. Thanks for any help
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: Big Block mechanical pump for 800 Hp
[Re: davesmopars]
#2439454
01/23/18 11:06 AM
01/23/18 11:06 AM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
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Central TEXAS!!!!
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The math says a 66GPH pump is needed. 800 HP/ 1/2 lb of fuel per hour = 400 lbs of fuel per hour. 400 LBS per hour / 6 lbs per gallon = 66 GPH. If you ran a 110 pump that would give you a 40% reserve. http://www.manciniracing.com/homefupu.html Joe
Without Data, you’re just another guy with an opinion.
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Re: Big Block mechanical pump for 800 Hp
[Re: sr4440]
#2439523
01/23/18 01:48 PM
01/23/18 01:48 PM
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Joined: Oct 2006
Posts: 89 sweden
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sweden
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Thats thru in theory, but in reality it need moore. I don't think a 110 GPH fuel pump is big enough. Fuel pump must struggle against fuel filter(s), regulator, various bends and turns in the fuel system and G-force when you floor it.
Last edited by carter; 01/23/18 01:56 PM.
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Re: Big Block mechanical pump for 800 Hp
[Re: carter]
#2439567
01/23/18 02:59 PM
01/23/18 02:59 PM
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Joined: Jan 2003
Posts: 13,351 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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Thats thru in theory, but in reality it need moore. I don't think a 110 GPH fuel pump is big enough. Fuel pump must struggle against fuel filter(s), regulator, various bends and turns in the fuel system and G-force when you floor it. Do all the calculations you want, but in the real world, on the car, at the track...that little 110 pump won't keep up.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Big Block mechanical pump for 800 Hp
[Re: carter]
#2439574
01/23/18 03:10 PM
01/23/18 03:10 PM
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Joined: Jan 2003
Posts: 14,491 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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Thats thru in theory, but in reality it need moore. I don't think a 110 GPH fuel pump is big enough. Fuel pump must struggle against fuel filter(s), regulator, various bends and turns in the fuel system and G-force when you floor it. And maintain a steady 6psi at the carb through it all. Most pump ratings are for "free flow"....... 0 psi. Those numbers are essentially useless.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Big Block mechanical pump for 800 Hp
[Re: carter]
#2439635
01/23/18 05:37 PM
01/23/18 05:37 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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Thats thru in theory, but in reality it need moore. I don't think a 110 GPH fuel pump is big enough. Fuel pump must struggle against fuel filter(s), regulator, various bends and turns in the fuel system and G-force when you floor it. what you have described is supply issues. You (and others) have made assumptions on where the engine is going and it's location relative to the fuel tank. The OP stated none of these. I have data (meaning I have tested) showing a mechanical fuel pump supporting 837HP with no issues. Joe
Without Data, you’re just another guy with an opinion.
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Re: Big Block mechanical pump for 800 Hp
[Re: Brewzer67]
#2439662
01/23/18 06:27 PM
01/23/18 06:27 PM
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Joined: Aug 2004
Posts: 3,392 cheshire, ct
davesmopars
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cheshire, ct
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I second the Clay Smith recommendation. They make a 6 valve big block pump that should meet your needs. Thanks, this should work.
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: Big Block mechanical pump for 800 Hp
[Re: hemicar1971]
#2439684
01/23/18 07:09 PM
01/23/18 07:09 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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Ran the 110 Pump back when that was all you could get, for a while and it did drop in different locations on a pass. I also ran a very big line and big filter with no kinks and slow curves in the line up to the regulator that was beside the Carbs. Being a stick car with a violent leave I knew I needed more pump. I would spend the money on it once and buy a better pump. There are a lot of fuel pumps that do a much better job than the 110 Pump and are not that much more money. Usually a pump pushes better than it pulls so location of the type of pump you are using has an effect of performance of the pump. are you talking about a electric pump? Because a mechanical pump develops a significant amount of vacuum on the suction side(10 inches of mercury on a stock pump)unlike a electric pump. I have never tested a HP pump to see how much vacuum it pulls. To the OP, it's clear that the majority opinion is you need a very large pump. A 140 GPH pump from clay smith that, he claims, supports 1300HP might get you by. http://www.claysmithcams.com/mopar-b-426-chrysler-hemi/I give up. Joe
Without Data, you’re just another guy with an opinion.
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Re: Big Block mechanical pump for 800 Hp
[Re: davesmopars]
#2439689
01/23/18 07:17 PM
01/23/18 07:17 PM
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crabman173
Unregistered
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crabman173
Unregistered
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Every time I have upgraded pumps the perfectly running drag car picked up and ran even better at the track---- The Edelbrock mechanical is pretty darn good for street cars but even on street rides with great mechanicals when I added an electric as a booster to the mechanical it ran better by far--good thing is you can run on the Mechanical and just flip on the electric when you are ready to stomp on it hard works like a charm and you don't have to hear that damn buzz all the time
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Re: Big Block mechanical pump for 800 Hp
[Re: ]
#2439700
01/23/18 07:59 PM
01/23/18 07:59 PM
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Joined: Apr 2004
Posts: 324 Northport, al.
tvt59
enthusiast
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enthusiast
Joined: Apr 2004
Posts: 324
Northport, al.
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I have used the C&S before works very well Must be regulated though
NEW
TOOL STEEL PREMIUM QUALITY MECHANICAL FUEL PUMPS
HIGH STRENGTH CASTINGS: Exclusive casting design adds material 7 places to eliminate cracking, breakage, waviness, and leakage. CORROSION RESISTANCE: Castings are bead blasted and alodine treated. Then color coded with baked catalyzed coating. VALVES: 6 C&S High Flow pumping valves, combined with internal porting are proven to deliver twice the fuel flow. DIAPHRAGM: All other pumping diaphragms are stamped from flat sheet stock. The convoluted (stepped) replacement doesn’t require stretching, eliminating leaks and elongated bolt holes. Less stress to the diaphragm itself means much longer life. DRIVE SPRING: Single spring replaced with two stainless alloy springs to lower stress and improve reliability. INTERNAL PUMP ARM: CNC milled from high strength 0-1 tool steel, then hardened and ground. All other brands use stamped low strength steel with no precision milling or grinding. PUMP ARM BUSHING: Low strength bushing prone to breaking replaced with a A-2 high strength tool steel precision part. VERTICAL PUMP SHAFT: Premium A-2 air hardening tool steel, Swiss CNC machined, smooth center less ground shaft. Creates an ideal surface for the new double lipped oil seal.
On the pivot end a hardened and ground pin pivots in a precision pocket. Previously two raw stamped steel edges created pivot point. Rough shaft made oil seal prone to leak. Available for SBC, BBC and Dodge. Recommended use with #4505 Alcohol Mechanical Bypass. 4230S-HD will work very well on gas with pressure sensitive bypass #4501. Some type of bypass regulator is required as unregulated pumps make over 17 PSI which will flood the engine if not controlled.
Nothing worth anything comes easy. It is always harder to do the right thing.
My Grandfather
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