Page 2 of 3 < 1 2 3 >
Topic Options
#2439725 - 01/23/18 06:02 PM Re: Big Block mechanical pump for 800 Hp [Re: bobby66]
Brewzer67 Offline
member

Registered: 05/12/17
Posts: 40
Loc: WI
Originally Posted By bobby66
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.

I hit it lucky and didn't have to clearance the block at all but it is a snug fit as it sits. I did have to clearance the pump almost to one of the screws. Last motor was a little over 600hp running with this pump and held a steady 7psi all the way down the track. Hopefully it will keep up with the new motor as well. Time will tell.

Top
#2439726 - 01/23/18 06:06 PM Re: Big Block mechanical pump for 800 Hp [Re: bobby66]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Originally Posted By bobby66
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.


What block do you have? I really do not want to grind my block


Edited by davesmopars (01/23/18 06:07 PM)

Top
#2439728 - 01/23/18 06:09 PM Re: Big Block mechanical pump for 800 Hp [Re: Brewzer67]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Originally Posted By Brewzer67
Originally Posted By bobby66
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.

I hit it lucky and didn't have to clearance the block at all but it is a snug fit as it sits. I did have to clearance the pump almost to one of the screws. Last motor was a little over 600hp running with this pump and held a steady 7psi all the way down the track. Hopefully it will keep up with the new motor as well. Time will tell.


What block do you have and do you run a return line?

Top
#2439737 - 01/23/18 06:28 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
dogdays Offline
I Live Here

Registered: 01/20/03
Posts: 16055
There is ONLY SO MUCH atmospheric pressure available to push the fuel into either pump. Same as on the oil pump, (except if you run a vacuum system in your crankcase there is less atmospheric pressure to push oil into the oil pump).

The atmospheric pressure will have an easier time pushing fuel through an 18" hose into an electric pump than it will have pushing the fuel through an 18 foot line up to the mechanical fuel pump. This is a fact of life. After the fuel gets into the pump it doesn't matter what the atmospheric pressure is because now it is the pump pushing the fuel into the carb.

R.

PS: Pumping a huge amount of fuel and using a regulator to return most of it to the tank heats the fuel and hurts performance as the engine runs. That's why it is better to have the system adequately sized, but not excessively huge.

Top
#2439752 - 01/23/18 07:12 PM Re: Big Block mechanical pump for 800 Hp [Re: sr4440]
Spaceman Spiff Offline
master

Registered: 11/28/10
Posts: 3086
Loc: jersey
Originally Posted By sr4440
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


from their website:
And, according to Dyno figures, it takes approximately 10galllons of gas per 100 HP per hour, the Clay Smith Power Pumper will theoretically handle up to 1300 HP on gas or 1150 on alcohol !

"THEORETICALLY" Just like your signature says, Without Data, you’re just another guy with an opinion.

I'd like to see that data that proves this will support 1300hp.
_________________________
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!

Top
#2439835 - 01/23/18 10:13 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
AndyF Online   content
Too Many Posts

Registered: 01/20/03
Posts: 23933
Loc: Oregon
NASCAR did it back in the day. My 514 uses 360 lbs of gas an hour to make 900 hp. That is 60 gph.

Top
#2440048 - 01/24/18 12:10 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Thanks everybody
I called clay smith they recommend to run the pump with a regulator , check valve with a return line. I am running a cross ram with 4235 and 4236 carbs any suggestion on how I should set up my fuel system and lines.
Thanks

Top
#2440068 - 01/24/18 12:40 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
astjp2 Offline
master

Registered: 01/18/11
Posts: 4145
Loc: Utah and Alaska
Rigid 1/2" stainless feed lines, parker braided Teflon between the pickup and hard line and frame rail to the pump. Tim
_________________________
1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!

Top
#2440069 - 01/24/18 12:41 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
Cuda340 Offline


Registered: 12/09/04
Posts: 1975
Loc: Wheatfield, NY
Mine is ran like this.


Attachments
IMG_5979.JPG




Edited by Cuda340 (01/24/18 12:42 PM)

Top
#2440087 - 01/24/18 01:00 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30722
Loc: Bend,OR USA
1/2 inch pickup in the tank with a 100 micron filter before the pump, 1/2 line to the pump then 3/8 lines from the regulator to the carbs. and probably a 5/16 or 3/8 return line twocents up
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Top
#2440366 - 01/24/18 11:18 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
Brewzer67 Offline
member

Registered: 05/12/17
Posts: 40
Loc: WI
Originally Posted By davesmopars
Originally Posted By Brewzer67
Originally Posted By bobby66
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.

I hit it lucky and didn't have to clearance the block at all but it is a snug fit as it sits. I did have to clearance the pump almost to one of the screws. Last motor was a little over 600hp running with this pump and held a steady 7psi all the way down the track. Hopefully it will keep up with the new motor as well. Time will tell.


What block do you have and do you run a return line?
I would have to go down and look but I am pretty sure it is a '72 or '73 440 block.

Top
#2440420 - 01/25/18 03:12 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
bobby66 Offline
master

Registered: 07/11/04
Posts: 2934
Loc: Arlington, Texas
Originally Posted By davesmopars
Originally Posted By bobby66
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.


What block do you have? I really do not want to grind my block


A '73 440. I mocked it up on a '78 400 and no grinding was needed on the block.
_________________________
B

Top
#2440625 - 01/25/18 01:53 PM Re: Big Block mechanical pump for 800 Hp [Re: bobby66]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30722
Loc: Bend,OR USA
Some Mopar RB and B blocks have a half moon shape machined into them by the fuel pump, some don't shruggy
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Top
#2440655 - 01/25/18 02:55 PM Re: Big Block mechanical pump for 800 Hp [Re: Cab_Burge]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Hopefully the pump will fit.
Picture not working, I need to take new one
moparts uses old tech, I have to set my phone on old settings


Attachments
fullsizeoutput_1c6f.jpeg




Edited by davesmopars (01/25/18 02:59 PM)

Top
#2448498 - 02/08/18 10:53 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Here is a picture on my block. Hopefully the pump fits.
I have a solid roller cam. Is the stock fuel pump pushrod ok to use?


Attachments
IMG_0763.JPG



Top
#2448500 - 02/08/18 11:01 AM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10534
Loc: Marion, South Carolina [><]
No. You need a bronze tipped pushrod to use on a billet roller cam.
_________________________
CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 446" w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'01 Ram 2500 QCSB 4x4 Cummins...toy hauler
'16 Grand Caravan SXT...baby hauler

Top
#2448851 - 02/08/18 09:40 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Any recommendations on who sells them?


Edited by davesmopars (02/08/18 10:43 PM)

Top
#2448900 - 02/08/18 10:55 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
FastmOp Offline
master

Registered: 01/20/03
Posts: 5102
Loc: Hot Rod Ridge
Mancini

Top
#2449102 - 02/09/18 11:29 AM Re: Big Block mechanical pump for 800 Hp [Re: Mopar Guy]
BIGSTROKER Offline
enthusiast

Registered: 01/12/06
Posts: 262
Loc: NEW HAMPSHIRE AND MAINE
That one will do it easy
claysmith nfg

Top
#2449194 - 02/09/18 04:20 PM Re: Big Block mechanical pump for 800 Hp [Re: davesmopars]
davesmopars Offline
master

Registered: 08/01/04
Posts: 2833
Loc: cheshire, ct
Thanks
Now how figure out the plumbing and the return line and make it look good.


Attachments
IMG_6747-2.JPG




Edited by davesmopars (02/09/18 04:22 PM)

Top
Page 2 of 3 < 1 2 3 >

Advertisement
Sponsored Link
Forum Stats
25,298 Registered Members
32 Forums
189,451 Topics
2,209,280 Posts

Most users ever online: 882 @ 03/05/17 10:15 PM
Moparts Newest Topics
Boom! Wall meet Danika...
by rrbrucea
05/27/18 01:30 PM
Electric fan placement for max cooling?
by Digger73
05/27/18 12:38 PM
Screws for Finish Panel
by b body idiot
05/27/18 11:48 AM
What type of anodizing is on '69 Charger rocker moldings?
by Dixie
05/27/18 10:25 AM