fuel for 5x18

919680cummins

919680cummins

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Sep 20, 2011
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I got an 887pump that is maxed out at 470cc with 093 lines, will i have the fuel to run them?
 
Never really thought of that.

How does one figure out if a pump can flow enough to get the benefit from big injectors.

Lets say 470cc with 5x.022"s
 
To make good hp u have to have good psi at the injectors. Just wanted to make sure. I am going to be putting a 66/80/14 on
 
My logic which could be flawed says that there must be some sort of rule of thumb for running big injectors.

Would a 400cc pump make more hp with 5x18's or 5x25's given everything else is the same.

Seems like right after the injectors popped off the fuel would run out faster and not atomize quite as well as say a 800cc pump that can push more fuel.

Never really thought to hard about this. Could be as simple as bigger equals more hp no matter what.
 
Running 5x020s with a 12mm and 50psi out of the air dog. Doesnt drop pressure.
 
How many cc's is your pump putting out Btp 2332?

Do think you could go any bigger and still be efficient?
 
I personally think there is more to it.
Pump cam?
Rpms?

I look at it as how fast can the pump recover from each injection even. I know of big pumps running big injectors with the pump turned down to around 400cc's for a high rpm puller.

I don't think there is one correct answer.
 
Going to go 5x025s prob mid season just to see. I had it benched maybe 7-8 years ago I beleive he stated 550 cc. Dad runs 5x025 with a 180pump with racked barrels with 60psi, never benched. He just went to a 13mm pump so will see what happends just switching pumps on his truck. He has 560 cc plate all the way back to 1,000cc with no plate.
 
97crewcab said:
I look at it as how fast can the pump recover from each injection even. I know of big pumps running big injectors with the pump turned down to around 400cc's for a high rpm puller.
Click to expand...

Thanks that is what I was looking for.
 
Yes you can turn up the pressure in your Raptor. If i remember correctly to 70 to 75 psi.
There is a jam nut with a slotted regulator bolt in the center. Loosen the jam nut and turn the regulator bolt clockwise to increase pressure and counterclockwise to decrease pressure.
 
estrada5.9 said:
My logic which could be flawed says that there must be some sort of rule of thumb for running big injectors.

Would a 400cc pump make more hp with 5x18's or 5x25's given everything else is the same.

Seems like right after the injectors popped off the fuel would run out faster and not atomize quite as well as say a 800cc pump that can push more fuel.

Never really thought to hard about this. Could be as simple as bigger equals more hp no matter what.
Click to expand...



A 12mm that can push 400cc vs one that pushes 600 (800 seems awfully high for a 12mm), if the cam and DV's are the same, the injection rate will also be the same. The 600cc pump will be running a much longer injection event to increase the fueling. So if the injection rate between the two pumps is the same, why can't the smaller run the same size injector?
 
Im running 5x18s with stock lines and non benched 180 pump with full cuts and 4k and 18* timing and a single s475. My fass doesnt keep up for nothing. It will drop from 50psi to 30psi under wot.
 
I have 5x.018's with a pump that is benched at 525. I have the plate pulled back quite a ways too so its not so smokey. I ran a different set of 5x.018's last year with a pump that wouldn't make 400cc's and it would light my 475 at about 2400 rpms with a stock bottom end but it had a really good head. I'd say my pump now is set somewhere around 400 but I have a lot of AFC tuning to keep the smoke minimal and my 66 lights at about 1400 rpms. I haven't seen it break 800* EGT's and it has just a light haze running about half throttle. My Airdog 200 runs at 47 psi idle and about 42 WOT.
 
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