another 14mm pump

[firstgennutty]

so I just picked up a 14mm head
from what i read so far it takes big injectors and higher pressure/loctite seal

so what fass, airdog/raptor are you guys using i was told to run 45psi but almost everyone i find online is limited at 30 psi?

for bigger lines what are you guys doing on the tank tide? as far as pick up goes

injectors....read that 6x18 were the minimum? true or what

anyone run the 14mm with the afc still? most i see read are either afc deltes or the arm is cut/removed? i want to drive mine too not just dyno/race

thanks

[JQmile]

My setup is: AirDog II 165gph, 30psi all the time, loctite seal, no KSB, but it does have an AFC, Hellmann Sump, and 6x16 injectors. Had it turned down about two full turns for daily driving, still plenty of fuel.

[firstgennutty]

forgive my idiocacy ksb?

[ahale2772]

its the icold start advance control, you will want to remove it with the 14mm cause if it blows it might lodge some plastic pieces in the head (usually fails with stock injectors with the pump maxed guessin its a case pressure thing but ive never had one hooked up).

6x18 arnt the Minimum, they are probably the max you would want to run with a street driver.

the afc will not NEED to be removed as long as you tune it correct.

fuel Supply is what you want to focus on. VOLUME is big, but because of the limited access of fuel into the VE because of small inlet ports (cant do much besides some larger fittings), hence pressure becomes a big factor, to push in fuel.

look up some articles on dual feed setups. KTA runs his yellow truck that way (and clearly has good results). it will allow some extra fuel to flow at higher loads (low case pressure).

you can install a case pressure guage pretty easily (I did mine through my shut of solinoid port). it will allow you to watch the case pressure and see what is happening.

my advice (keep in mind ive never done a 14mm). but anyways... I would run a mechanical rotoray lift pump instead of a electric. (just because of volume). one like this... http://www.obxracingsports.com/products.php?pk=1555.

rig it up with a pully off of somewhere, a healthy fuel pressure regulator and you will have a BIG reliable fuel system.

only mystery to me is what the 14mm needs at IDLE, because Im guessing the rotary fuel pump would fall to 15-20 psi at idle, unlike a electric that would maintain its high pressure

[Remps]

It'd probably be alright as long as it was making 30+ psi by 1500 rpm. Be sure to at least loctite the front seal in. I don't think KTA's dual feed was even hooked up yet when he dynoed those numbers..

[ahale2772]

yeah IDK if he had the dual feed up either.

it would be good to tally all the times 14mm's have died, and what the conditions were (high rpm/ fuel pressure.... all that jazz)

either way the fact that KTA's dual feed system even worked means the case pressures were dragged down below the supply pressure of hus aux pump (75 psi)

...thats pretty low considering I see pressures of 250+psi and a low of about 120psi at WOT

big injectors and a 14mm drain case pressure ALAHT

[ahale2772]

what would be cool is to take a liftpump like the one in the link i posted (or any pump that provides 100+psi) and use two regulators coming from the pump output. one regulated to the stock inlet infront of the vane pump at about 30psi and one that can provide about 100psi directly into the case at WOT (when the case pressure drops)

...theoreticaly you could do that with a single pump

[JQmile]

Most of the 14mm failures I have heard of are from people trying to cheap out on parts, or trying to spin 4500rpm with them.
I can tell you that a 14mm/4mm camplate pump usually lasts about 1 pull on a dyno or test stand

[oldestof11]

Jason, do you know if the machine a larger bore for the fuel entering the rotor?

[dragrdan]

Jason, do you know if the machine a larger bore for the fuel entering the rotor?

It is actually a slot, if you pull your shutoff solenoid, and look down inside you will see it. The slot cant be widened, or it would shorten you lift. If it were wider it would be open when your camplate is trying to build pressure, and the pressure would go back that way until it closed. Going longer might help some, but I cant see it being enough to justify the cost of EDMing it.

[ahale2772]

if you pull your shutoff solenoid, and look down inside you will see it

that being said, is the shutoff solinoid port a good place for a second fuel feed?

[Remps]

If fuel can get out of the case to record case pressure at the shutdown solenoid, fuel should be able to go the other way as well, no?

[oldestof11]

Yes...

And no...

Unless you can push 50-200psi reactively.

[Remps]

A check valve on the shutoff solenoid with a 200-300 psi relief valve behind it, and either a mechanical or part time gear driven electric would work..

[Mark Nixon]

It's all for naught if you don't do anything about the internal fuel transfer pump, which is what SUPPLIES fuel to the rotor.
It's the main crutch in the VE for moving mass quantities of fuel.
Find a reliable and inexpensive way to increase it's volume and you'll be a guru in the VE world.

Just adding multiple inlets and higher pressures only prolong the eventual end.

Mark.