Best mechanical fuel pump for 900 plus sc engine
09-21-2017, 07:21 PM
#2
Registered
Thread Starter
iTrader: (7)
Can't remember the ones that were discussed last fall nor could find the thread but wanted to go with the ones that were mentioned in a couple threads. Seemed like they came in 130 gpm and choice of 15 or 30 psi.
09-21-2017, 09:21 PM
#3
Registered
iTrader: (1)
Procam from Baker ?
http://www.bakerengineeringinc.com/P.../Pro-Cam-Parts
Ask I see dead people - think he got the low psi one and had fuel psi (volume) issues, then got the high psi one and that was fine...obviously with regulator.
Best pump out now I believe is the CV Products Nascar pump. It's like $600-$800,
http://www.bakerengineeringinc.com/P.../Pro-Cam-Parts
Ask I see dead people - think he got the low psi one and had fuel psi (volume) issues, then got the high psi one and that was fine...obviously with regulator.
Best pump out now I believe is the CV Products Nascar pump. It's like $600-$800,
09-21-2017, 09:42 PM
#5
Registered
Thread Starter
iTrader: (7)
That's it. Part #9375/15 psi. Tks for the response. also curious what MT did about a fuel regulator. I have 6 port fuel log and plans to run hose to each bowl from rear of engine but not sure what to do about regulator. Was also considering 4-port regulator. Just don't want to do this once and right. Restriction from regulators concern me.
SB if I absolutely had to I would. Lol.... when I did google BBC fuel pumps and bakers never showed up when I when to images and scrolled. I do recall icdedppl fuel pressure dropping to like 2 pds during long hard runs.
SB if I absolutely had to I would. Lol.... when I did google BBC fuel pumps and bakers never showed up when I when to images and scrolled. I do recall icdedppl fuel pressure dropping to like 2 pds during long hard runs.
Last edited by getrdunn; 09-21-2017 at 10:00 PM.
09-21-2017, 09:53 PM
#6
09-22-2017, 07:37 AM
#8
Registered
iTrader: (3)
I am using the low pressure version.
If you are going to use the high pressure version, I would definitely use a return style regulator, and return the fuel to the tank, rather than use a dead head regulator.
My buddy Matt on here is using the low pressure pumps as well, his engines made 1020hp. So far so good. Mercury used the same pumps on the 900sc engine.
Fuel pressure is a sticky subject. Many years ago, before widebands, all we had was fuel psi gauges. Back then, if you saw any drop in fuel psi, you assumed fuel starvation issues, and made changes. However, there are alot of variables on whether or not there is sufficient fuel being fed to the engine. Obviously, the wideband will help tell that story. Aside from this, things like needle and seat size, needle and seat quantity, and so on.
Example. Lets say you have a single carb B&M 250 blower setup. Someone put .097 Needle and seats in it. Its a stout engine build, with good heads, cam, exhaust , and so on. You run a marginal fuel pump. You have a -6 line from pump to carbs. You hook a fuel psi gauge to the fuel line, and see good fuel pressure. Engine still can go lean.
Scenerio 2. You have a twin carb setup. Now this one has .130 needle and seats in all 4 corners. You have a -10 line feeding the log, and -6 to the bowls. At wot, your fuel psi gauge drops from 6.5psi to 5psi. You immediately think "LEAN", but that isnt always the case. While you are seeing a drop in pressure, you arent necessarily seeing a drop in FLOW. Carbs arent efi. They like flow, not pressure. Prostocks were running as little as 2psi of fuel psi thru the traps. Not much pressure, but gobs of flow.
Needle and seat diameter and quantity of needle and seats , is often overlooked . A .130 N&S, can flow a chit ton more fuel than a .097 N&S, at 6psi of pressure. Four needle and seats (twin carb), can flow...well double what a single carb can.
Those six valve baker style pumps, can flow a ton of fuel. But they arent going to do their job, if the tank pickup is too small, restrictive fittings, small lines, and what not are used.
The small diameter n&s assembles can tolerate more fuel psi, without coming off their seat, than the larger ones. The small N&S and excessive psi = lots of fuel bowl aeration (not good). If you wanna go a step further, BLP has bottom feed needle and seats. Not only do they flow great, they do so with very little aerating of the fuel.
If you are going to use the high pressure version, I would definitely use a return style regulator, and return the fuel to the tank, rather than use a dead head regulator.
My buddy Matt on here is using the low pressure pumps as well, his engines made 1020hp. So far so good. Mercury used the same pumps on the 900sc engine.
Fuel pressure is a sticky subject. Many years ago, before widebands, all we had was fuel psi gauges. Back then, if you saw any drop in fuel psi, you assumed fuel starvation issues, and made changes. However, there are alot of variables on whether or not there is sufficient fuel being fed to the engine. Obviously, the wideband will help tell that story. Aside from this, things like needle and seat size, needle and seat quantity, and so on.
Example. Lets say you have a single carb B&M 250 blower setup. Someone put .097 Needle and seats in it. Its a stout engine build, with good heads, cam, exhaust , and so on. You run a marginal fuel pump. You have a -6 line from pump to carbs. You hook a fuel psi gauge to the fuel line, and see good fuel pressure. Engine still can go lean.
Scenerio 2. You have a twin carb setup. Now this one has .130 needle and seats in all 4 corners. You have a -10 line feeding the log, and -6 to the bowls. At wot, your fuel psi gauge drops from 6.5psi to 5psi. You immediately think "LEAN", but that isnt always the case. While you are seeing a drop in pressure, you arent necessarily seeing a drop in FLOW. Carbs arent efi. They like flow, not pressure. Prostocks were running as little as 2psi of fuel psi thru the traps. Not much pressure, but gobs of flow.
Needle and seat diameter and quantity of needle and seats , is often overlooked . A .130 N&S, can flow a chit ton more fuel than a .097 N&S, at 6psi of pressure. Four needle and seats (twin carb), can flow...well double what a single carb can.
Those six valve baker style pumps, can flow a ton of fuel. But they arent going to do their job, if the tank pickup is too small, restrictive fittings, small lines, and what not are used.
The small diameter n&s assembles can tolerate more fuel psi, without coming off their seat, than the larger ones. The small N&S and excessive psi = lots of fuel bowl aeration (not good). If you wanna go a step further, BLP has bottom feed needle and seats. Not only do they flow great, they do so with very little aerating of the fuel.
09-22-2017, 10:47 AM
#10
Gold Member
Pressure, flow rate and volume are oftentimes misunderstood.
Also, with line size.....the relationship of line diameter and cross sectional area is not linear.
That is to say, a 1" line flows way more than twice that of a 1/2" line. same goes with any oriface, I.E....carb jets
Also, with line size.....the relationship of line diameter and cross sectional area is not linear.
That is to say, a 1" line flows way more than twice that of a 1/2" line. same goes with any oriface, I.E....carb jets
