Hypothesis: Injectors for Better Mileage

[lemon boy]

Not sure if this one will generate the interest needed for a really good discussion although I wish it would b/c I lack the technical background to make it all work.

Hypothesis-

It'd be possible to fairly significantly increase mileage (and power) primarily through the injectors (plus some supporting mods).

My guess on this front is that say instead of 5 or 7 hole tips maybe 9 hole tips to increase atomization of the fuel. It'd likely need to be accompanied by an HPOP of some sort and of course some new tuning from the wolfman.

I know that most people are chasing the power monster but I don't so much care about that as improving mileage (and please, spare me the economic rationalization for MPG increases, I know that 3K+ in parts doesn't have a realistic payback but if you're doing those items anyway then....) although it seems to me that applying the same basic concepts (high ICP + shorter PW + better tips) to a basically stock size (or really whatever size if you're controlling with programming) injector would yield better mileage.

Or...I may be FOS.

discuss.

[1997PSD4ME]

sounds good to me. i just drove the country and have not figured my numbers but i think i was in the 15-16 mpg range going 72 mph all the way 2950 miles a few months back with stock injectors i could only get 13. i will do the math and get back to you.

[svswan]

I would Love to see some discussion on better milage. Unfoutunetly I don't have the knowlage to contribute but I would propubly be among the first to try it and report back. I recently did about 2500 miles on a trip and got about 11mpg with a camper on back - 9400 GVW.

[johndeerebones]

I may be wrong, but by my mechanical and hydraulic theories, more holes in the nozzle, or larger holes in the nozzle is going to have a very adverse effect on atomization, there has to be a certain amount of restriction to keep the injection pressure high, decreasing restriction would increase flow, but drop pressure. I guess it would be possible with a higher rate nozzle spring, but it would take some r&d to figure out what would be needed.

But different injectors could definitely increase mileage, better atomization just because if they've been gone through they are "freshened up" with new seals and clearances put back where they should be, plus it will take less pedal to put out the same power, your engine will naturally be more efficient to a point, after a certain point of added power you are just all the time making overkill power for what you are doing, so mileage will naturally drop.

[oldbird1965]

I'm just like svswan, 4K trip-11mph average pulling 10K. My goal starting a couple of years ago was to increase both power and MPH.
As memtioned though, I have no knowledge really except for what I read. I have though increase from about 9 to 11mph and I stay in the fast lane. Keep this thread alive, I would spent thousands to get a little better MPH. I know this attitute doesn't make sense to most of you but I hate getting ripped off at the pump because of make believe shortages.

[RickHredf250]

What comes to my mind is how to raise the BTU's of the fuel. More air? Finer atomization? Got me but seems to me it would take a lot of expensive equipment to do any real testing.
One thing against us in Cubic Inches. We got a lot!
What gears are in your truck and is it an auto or stick?
My 97 has 4.10's and the 96 has the uhhhhh I forget 3.55's???
There is a 4.5 mpg difference between the two. And the 96 ain't stock and the 97 is mostly. Well and the 97 is a CC and the 96 is a SC but they weigh almost the same.
I considered a gear vendors over drive for the 97 as it was cheaper than changing the gears and the 4.10's are nice in the mountains going up and down.
But what I ended up doing was making my own fuel for under .60 per gallon so I do not worry to much about MPG anymore!
Well thats what my brain spit out about this topic!
Rick H...

[lemon boy]

[ QUOTE ]
I may be wrong, but by my mechanical and hydraulic theories, more holes in the nozzle, or larger holes in the nozzle is going to have a very adverse effect on atomization, there has to be a certain amount of restriction to keep the injection pressure high, decreasing restriction would increase flow, but drop pressure. I guess it would be possible with a higher rate nozzle spring, but it would take some r&d to figure out what would be needed.


[/ QUOTE ]

I know where you're coming from I think, my general idea here though is to add more (smaller) holes to inject the fuel but under significantly higher ICP pressures than stock. I thought (but could be totally wrong) that there is a fair degree of playing that can be done at the nozzle end of things although...now that I think about it I wonder if they can only hog em out instead of starting from a blank slate.

97F350- Glad to hear that your swap improved mileage, one of my other questions would be exactly what about the swap (or conversly the old injectors) was causing the poor mileage.

[johndeerebones]

[ QUOTE ]
I may be wrong, but by my mechanical and hydraulic (or conversly the old injectors) was causing the poor mileage.

[/ QUOTE ]

Exactly what I was getting at, more than likely if it is that big of a difference, there were problems in the old system.

[wonderdawg]

Not to stray off subject here or anything, but how is it that you make your own fuel for around $.60 a gallon???

Wonderdawg

[PSDfreak]

[ QUOTE ]
Not to stray off subject here or anything, but how is it that you make your own fuel for around $.60 a gallon???

Wonderdawg

[/ QUOTE ]

I would assume he's making Bio

-casey

[Vengeance]

[ QUOTE ]
[ QUOTE ]
Not to stray off subject here or anything, but how is it that you make your own fuel for around $.60 a gallon???

Wonderdawg

[/ QUOTE ]

I would assume he's making Bio

-casey

[/ QUOTE ]

That would be a correct assumption

[Nitro454]

$.60/gal [img]/ubbthreads/images/graemlins/shocked.gif[/img] im under $.40/gal. and its a good thing too with the new injectors and chip or else id be broke [img]/ubbthreads/images/graemlins/tongue.gif[/img]

[Sparkydm]

You Bio guys are making me ill! [img]/ubbthreads/images/graemlins/vomit.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

[RickHredf250]

Nitro, lets take it over to the Bio forum and I challange you to prove your under .40 per gallon. My actual Lye and methanol is .46, I add some more in for electric and water.
See you over there?????
Rick H...

[Nitro454]

I posted my numbers up, but in the long run the only thing I am really paying for is the methanol at $1.90/gal. and i also have been using less than the 22% methanol that most other people use