Big Oil

[Ramsmoker]

I ran into this a week ago. I can't find much about it anywhere on line except the diesel stop. I know I can over pressurize the injectors to the point that the PCM can't shorten the pulse length to. I am shure thats what is happening by the way it lopes but shows no excessive fuel in the oil. I guess where I get confussed is how much oil is needed. The pressure seems to be easy to get. I didn't think there was a large need for volume either. Most of the sane size injectors claim to work fine a stock HPOP. The guys at the diesel stop aresaying they can get around 500hp with a 3.5 exhaust stock turbo stock injectors and a DP tuned PCM. I was told truck against truck as even as possible the big oil truck would take the big injectored truck because the fuel is atomized better. I know you can to a point push more fuel through a given hole with pressure. If thats the case, how come you don't need more air. Heck, a basicly stock PSD will benifit from more turbo. In my little brain this is basic physics. The ratio of fuel and air doesn't change because you spray it in harder. You guys have got to help me here fast. I have to go down to Cabo and lay in the sand next week. You wouldn't want me to loose any sleep over this would you. Don't answer. It's a crappy job but someone has to do it.

[KCS250]

Diesel's air/fuel ratio varies anyway. it doesn't care about the ratio, like a gas motor. More fuel more power. There is no throttle valve like a gas
motor. It pumps and the fuel (and engine speed) is varied w/ the pedal.

[KCS250]

Don't know if there aren't other problems w/ the higher pressure.

[mschn99]

actually, air fuel ratio with a diesel is EXTREMELY important, since diesel is way less volitile than gas and takes a more controlled environment to create a conrolled and consistant explosion.......i have a hard time believing a stock turbo could keep up with these systems if a stock injector is capable of "loping" the idle already (more fuel than the motor can burn)....but ill leave you guys to discuss this as i have already given my opinions to ramsoaker via email........Marc

[KCS250]

I'am shutting up.

[mschn99]

Originally Posted by KCS250

I'am shutting up.

please dont shut up...im just telling what i have been told in my diesel classes....if you have info that contradicts that....id love to hear it and the explanation. Ford does not know everything...and they are the principal basis for most of my knoledge that was not gained real world experience......im not arguing.....i like discussing ideas.......Marc

[KCS250]

Mschn99
Understood. I'am really tired anyway.
Also I tend to not be specific enough.
Have really enjoyed reading your posts.
I meant earlier is that the ratio varies much much more than the gas motor,(or so i read on .... Dieselsomething?.com). Basically the air flows and the fuel ands speed/power is regulated by adding or reducing fuel more indepedent of the mass air flow.

As usual your point about the injector moving alot of fuel is quite valuable here. What you think about higher pressure verses engine oil system reliablity?

---

Last edited by KCS250 : 02-02-2006 at 07:05 PM.

[mschn99]

Originally Posted by KCS250

Mschn99
Understood. I'am really tired anyway.
Also I tend to not be specific enough.
Have really enjoyed reading your posts.
I meant earlier is that the ratio varies much much more than the gas motor,(or so i read on .... Dieselsomething?.com). Basically the air flows and the fuel ands peed/power is regulated by adding or reducing fuel kinda indepedent of the mass air flow.

As usual your point about the injector move alot of fuel is quite valuable here. What you think about higher pressure verses engine oil system reliablity?

first off, to answer your question....my opinion, not based on any published facts...is that the injector in a 7.3 can not handle extreme oil pressures. it can probably take...the o rings system for sealing would blow out by the time you got a huge benifit over what you can do with "tricking" the stock system.

Ramsoaker...correct me if im wrong....but i beleave when i read the stuff that you wanted me too look at from those "other guys" they claimed 25,000 psi from the big oil system to a STOCK injector.....i know for a fact...from my gut.... that there is no way in......heck........ that this is possible. first off...a stock turbo could in no way or form push enough air to burn what that injector would be injecting, and the injector o rings would blow out....or what may be happening is the regulating injector (# 8 is called the CAC injector and is different from the other 7) would blow out....something has to give when you go over 5 times what the stock system could build naturally....i would believe 6-8000 psi...it may be a streatch...but beleaveable.....25k i would never beleive without seeing it....and then seeing it not blow smoke or have take off problems from fuel loading....

they also claimed better "atomization"....which in technical terms means the fuel and air mixing....but with nothing different about the air flow....and no change in the size of the holes the fuel comes out...it seems to me that it would be "volumization"...its like sqeezing an eye dropper hard...the drops dont get bigger...they just get more frequent (untill they stream...which is worse yet with fuel)......that still doesnt help the cumbustion process if the air is not there to help it burn....

this is just my two cence...most of it is not based on anything written in stone...and i would like some opinions.......along with helping ramsoaker answer his intial question....and sorry if i highjacked this thread at all ramsoaker.......Marc

[KCS250]

My vote is that it might help the atomization. Probably on up to a limited point though. Alos thinking that the stock fueling levels verses aitrflow allow for more fuel???
Opps after midnight, 5:30 will be painfull. gotta go

[mschn99]

Originally Posted by KCS250

My vote is that it might help the atomization. Probably on up to a limited point though. Alos thinking that the stock fueling levels verses aitrflow allow for more fuel???
Opps after midnight, 5:30 will be painfull. gotta go

what you are saying is VERY possible even though i doubt what those guys actually claimed for total gain.....i would love to see the dyno and real world testing.....the proof is in the numbers......