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#2439082 - 01/22/18 01:36 PM Big Block mechanical pump for 800 Hp
davesmopars Offline
master

Registered: 08/01/04
Posts: 2776
Loc: cheshire, ct
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

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#2439128 - 01/22/18 03:16 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
Mopar Guy Offline
enthusiast

Registered: 10/07/06
Posts: 370
Loc: Sweden
This one !?


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#2439246 - 01/22/18 08:00 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
rt66jim Offline
master

Registered: 01/19/03
Posts: 3927
Loc: Joplin, Mo
Call Clay Smith.

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#2439370 - 01/22/18 11:43 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10314
Loc: Great Neck,LI,new york
Went with the Magna 500.Should just about cover all the cars here


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#2439431 - 01/23/18 05:41 AM Re: Big Block mechanical pump for 800 Hp [Re: hemi-itis]
Dragula Offline


Registered: 05/02/04
Posts: 10107
Loc: Taxes R-US, NY
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#2439454 - 01/23/18 08:06 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
sr4440 Offline
mopar

Registered: 02/06/08
Posts: 430
Loc: Central TEXAS!!!!
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
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#2439517 - 01/23/18 10:30 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
Brewzer67 Offline
member

Registered: 05/12/17
Posts: 26
Loc: WI
I second the Clay Smith recommendation. They make a 6 valve big block pump that should meet your needs.

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#2439523 - 01/23/18 10:48 AM Re: Big Block mechanical pump for 800 Hp [Re: sr4440]
carter Offline
member

Registered: 10/25/06
Posts: 27
Loc: sweden
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.


Edited by carter (01/23/18 10:56 AM)

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#2439540 - 01/23/18 11:11 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10314
Loc: Great Neck,LI,new york
You can never have a "too big" fuel pump as long as it is regulated.
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#2439567 - 01/23/18 11:59 AM Re: Big Block mechanical pump for 800 Hp [Re: carter]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10292
Loc: Marion, South Carolina [><]
Originally Posted By carter
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.

iagree 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.
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#2439574 - 01/23/18 12:10 PM Re: Big Block mechanical pump for 800 Hp [Re: carter]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 10632
Loc: So. Burlington, Vt.
Originally Posted By carter
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.
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#2439584 - 01/23/18 12:37 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
mprhound Offline
enthusiast

Registered: 05/19/03
Posts: 388
Loc: Texas
Put it in the for sale section.... tsk


Edited by tboomer (01/23/18 12:50 PM)

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#2439635 - 01/23/18 02:37 PM Re: Big Block mechanical pump for 800 Hp [Re: carter]
sr4440 Offline
mopar

Registered: 02/06/08
Posts: 430
Loc: Central TEXAS!!!!
Originally Posted By carter
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


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#2439638 - 01/23/18 02:43 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
hemicar1971 Offline
master

Registered: 01/19/03
Posts: 4459
Loc: Chicago Blackhawks
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.

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#2439661 - 01/23/18 03:26 PM Re: Big Block mechanical pump for 800 Hp [Re: rt66jim]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2776
Loc: cheshire, ct
Originally Posted By rt66jim
Call Clay Smith.


Thanks

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#2439662 - 01/23/18 03:27 PM Re: Big Block mechanical pump for 800 Hp [Re: Brewzer67]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2776
Loc: cheshire, ct
Originally Posted By Brewzer67
I second the Clay Smith recommendation. They make a 6 valve big block pump that should meet your needs.


Thanks, this should work.

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#2439676 - 01/23/18 03:50 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
bobby66 Offline
master

Registered: 07/11/04
Posts: 2912
Loc: Arlington, Texas
Be ready to do some serious grinding on that Clay Smith pump. Had to grind the block on my 440, ran out of room on the pump.
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#2439684 - 01/23/18 04:09 PM Re: Big Block mechanical pump for 800 Hp [Re: hemicar1971]
sr4440 Offline
mopar

Registered: 02/06/08
Posts: 430
Loc: Central TEXAS!!!!
Originally Posted By hemicar1971
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
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#2439689 - 01/23/18 04:17 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
crabman173 Offline
master

Registered: 01/01/06
Posts: 3631
Loc: Big Lick , North Carolina
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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#2439700 - 01/23/18 04:59 PM Re: Big Block mechanical pump for 800 Hp [Re: crabman173]
tvt59 Offline
enthusiast

Registered: 04/11/04
Posts: 259
Loc: Northport, al.
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.
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