Single Shot Injector Question?
Senior User
Joined: Aug 2009
Posts: 193
Likes: 0
I'M THINKING ABOUT SINGLE SHOTS ALSO
ONE OF THE ORIGINAL QUESTIONS WAS STAGE 1 OR STAGE 2 (SINGLES)
I HAVE JODY'S 120/140
COLD AIR
4 INCH
SEEMS THE STAGE1 IS ONLY ABOUT 50 HP.
STAGE 2 90HP OR SO?
I PLAN ON UPGRADING TURBO/FUEL SYSTEM EVENTUALLY.
DO YOU THINK STAGE 1 IS A WAIST.
I'M GUILTY LIKE MOST I'LL WANT MORE.
CAN I GET AWAY WITH STAGE 2 TILL I DO OTHER UPGRADES?
IF I KEEP OUT OF THROTTLE SAY UNDER 2800 RPM (GOING UP TO 2800RPM,BACKING OFF CAN I GET AWAY WITH EGT ISSUES ETC.
THANKS
I HAVE JODY'S 120/140
COLD AIR
4 INCH
SEEMS THE STAGE1 IS ONLY ABOUT 50 HP.
STAGE 2 90HP OR SO?
I PLAN ON UPGRADING TURBO/FUEL SYSTEM EVENTUALLY.
DO YOU THINK STAGE 1 IS A WAIST.
I'M GUILTY LIKE MOST I'LL WANT MORE.
CAN I GET AWAY WITH STAGE 2 TILL I DO OTHER UPGRADES?
IF I KEEP OUT OF THROTTLE SAY UNDER 2800 RPM (GOING UP TO 2800RPM,BACKING OFF CAN I GET AWAY WITH EGT ISSUES ETC.
THANKS
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
Hey 01, beings its Sunday, not alot of traffic but its picking up, this thread will get you the answers you'll need if you haven't gotten them already, hang around. I have a certain preference for hybrids but I'm learning the benefits of all size injectors..
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
ONE OF THE ORIGINAL QUESTIONS WAS STAGE 1 OR STAGE 2 (SINGLES)
I HAVE JODY'S 120/140
COLD AIR
4 INCH
SEEMS THE STAGE1 IS ONLY ABOUT 50 HP.
STAGE 2 90HP OR SO?
I PLAN ON UPGRADING TURBO/FUEL SYSTEM EVENTUALLY.
DO YOU THINK STAGE 1 IS A WAIST.
I'M GUILTY LIKE MOST I'LL WANT MORE.
CAN I GET AWAY WITH STAGE 2 TILL I DO OTHER UPGRADES?
IF I KEEP OUT OF THROTTLE SAY UNDER 2800 RPM (GOING UP TO 2800RPM,BACKING OFF CAN I GET AWAY WITH EGT ISSUES ETC.
THANKS
I HAVE JODY'S 120/140
COLD AIR
4 INCH
SEEMS THE STAGE1 IS ONLY ABOUT 50 HP.
STAGE 2 90HP OR SO?
I PLAN ON UPGRADING TURBO/FUEL SYSTEM EVENTUALLY.
DO YOU THINK STAGE 1 IS A WAIST.
I'M GUILTY LIKE MOST I'LL WANT MORE.
CAN I GET AWAY WITH STAGE 2 TILL I DO OTHER UPGRADES?
IF I KEEP OUT OF THROTTLE SAY UNDER 2800 RPM (GOING UP TO 2800RPM,BACKING OFF CAN I GET AWAY WITH EGT ISSUES ETC.
THANKS
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
So what I'll do instead is add a few more words to the topic of engine wear versus single-shot and split-shot injectors! The "pilot injection" feature of the newer split-shot injectors reduces the "ignition delay" for the "main injection" that follows ...and this in turn reduces both ...the rate of increase in cylinder pressure and temperature ...and the maximum values of cylinder pressure and temperature in the vicinity of TDC.
With single-shot injectors the extra fuel mass that's initially injected causes a longer "ignition delay" and in addition to the adverse impact this has on cylinder pressure and temperature ...a longer "ignition delay" also means there's a greater chance for some unburned fuel to contact the cylinder wall and find its way down past the piston rings ...thereby causing an additional disruption to the oil film between the rings and the cylinder wall!
With single-shot injectors the extra fuel mass that's initially injected causes a longer "ignition delay" and in addition to the adverse impact this has on cylinder pressure and temperature ...a longer "ignition delay" also means there's a greater chance for some unburned fuel to contact the cylinder wall and find its way down past the piston rings ...thereby causing an additional disruption to the oil film between the rings and the cylinder wall!
In addition, many stock 7.3L PSD's came equipped with singles, and that hasn't affected longevity of those engines either.
Senior User
Joined: Aug 2009
Posts: 193
Likes: 0
BIG POPPA,
based on your signature it appears injectors is your next step.
I spoke to Clay he indicated I could go stage 1 and upgrade to stage 2 later for around $600.
I didn't ask if he could turn the stage 1's into Hybrid's?
based on your signature it appears injectors is your next step.
I spoke to Clay he indicated I could go stage 1 and upgrade to stage 2 later for around $600.
I didn't ask if he could turn the stage 1's into Hybrid's?
Posting Guru
Joined: Jul 2004
Posts: 1,235
Likes: 0
From: Kamloops, BC
Jim is your truck a auto ??????
Senior User
Joined: Aug 2009
Posts: 193
Likes: 0
Jim,
Who's singles do you have?
What power level do you run it in (when your into throttle)
Egt issues?
Fuel economy in 80e tune?
Who's singles do you have?
What power level do you run it in (when your into throttle)
Egt issues?
Fuel economy in 80e tune?
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Posting Guru
Joined: Feb 2004
Posts: 2,365
Likes: 0
From: IOWA
So what I'll do instead is add a few more words to the topic of engine wear versus single-shot and split-shot injectors! The "pilot injection" feature of the newer split-shot injectors reduces the "ignition delay" for the "main injection" that follows ...and this in turn reduces both ...the rate of increase in cylinder pressure and temperature ...and the maximum values of cylinder pressure and temperature in the vicinity of TDC.
With single-shot injectors the extra fuel mass that's initially injected causes a longer "ignition delay" and in addition to the adverse impact this has on cylinder pressure and temperature ...a longer "ignition delay" also means there's a greater chance for some unburned fuel to contact the cylinder wall and find its way down past the piston rings ...thereby causing an additional disruption to the oil film between the rings and the cylinder wall!
With single-shot injectors the extra fuel mass that's initially injected causes a longer "ignition delay" and in addition to the adverse impact this has on cylinder pressure and temperature ...a longer "ignition delay" also means there's a greater chance for some unburned fuel to contact the cylinder wall and find its way down past the piston rings ...thereby causing an additional disruption to the oil film between the rings and the cylinder wall!
With single-shot injectors, you say they have a longer ignition delay, causing a greater chance of cylinder washing. Isn't that all controlled by SOI, which any tuner can malnipulate? Can't they delay the injection so that it optimizes the combustion event?
Also, If fuel "sitting" in the cylinder before it ignites is bad and can cause washing, how then is a pilot shot better, since it sits there longer before the fuel/air is compressed enough to ignite?
Postmaster
Joined: Jun 2006
Posts: 2,647
Likes: 0
From: Fulltime RVer
...Gene, you're confusing me here. I'm reading this and I see it going both ways. Hopefully I can word it clearing enough to ask my confusion.
With single-shot injectors, you say they have a longer ignition delay, causing a greater chance of cylinder washing. Isn't that all controlled by SOI, which any tuner can malnipulate? Can't they delay the injection so that it optimizes the combustion event?
Also, If fuel "sitting" in the cylinder before it ignites is bad and can cause washing, how then is a pilot shot better, since it sits there longer before the fuel/air is compressed enough to ignite?.
With single-shot injectors, you say they have a longer ignition delay, causing a greater chance of cylinder washing. Isn't that all controlled by SOI, which any tuner can malnipulate? Can't they delay the injection so that it optimizes the combustion event?
Also, If fuel "sitting" in the cylinder before it ignites is bad and can cause washing, how then is a pilot shot better, since it sits there longer before the fuel/air is compressed enough to ignite?.
As I've already said I'll be giving a more complete answer here... https://www.ford-trucks.com/forums/9...tock-7-3l.html ...but only after I've done the background posts leading up to the several I'll be giving on injectors!
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
I wish I could help you on which ones can be swapped, disasembled, I'm learning hear as well, I'm also trying to educate myself as too which ones. I will say this, do it once and do it the way you want it IMO unless you like pulling injectors, which I never did.
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
