A little more on the New ford trickeling out

parker.rowe wrote:

I believe some manufactures are using, or adding port injectors back to direct injection engines as well.

The Ford 5.0L Coyote uses dual injectors. IIRC, most of the fuel goes through the port injectors. For sure, part of the reason for dual injectors is to reduce particulate emissions (see previous post).

I still find it hard to believe that they are going DI. DIs big advantage is the capability to run lean (better fuel economy), which increases the NOx. I am not certain what the difference in NOx levels are for different vehicle weight classes.

The other issue with DI is "particulate emissions". EPA/CARB have been wanting to clamp down on these for awhile. No one wants a particulate trap on a gas engine !

The one picture claimed to show a "pocket" for the DI, but I also did not notice the either of the 2 spark plug holes.

ShinerBock wrote:
Direct injection is dirtier than port injection in regards to PM (particulate matter). In some cases, gasoline direct injected engines spew more PM than diesels, but much finer particulates than cannot be seen. This is why gasoline direct injection engines have soot on the pipes like old diesels used to before DPF's.

Benefits of direct injection....

You don't have to wait until the intake port opens to inject fuel into the cylinder. Therefor you can control injection timing and even have multiple injection events per stroke. You can wait until at the end of the compression stroke to inject the fuel so it doesn't pre-detonate. With a port injected engines, you have to inject the fuel into the cylinder on the intake stroke while the intake valve is open and run the risk of that fuel pre-detonating on the compression stroke before the spark plug ignites.

Because of this, direct injected engines can run at higher compression ratios then port injected engines making them more efficient. You can also inject a small amount of fuel on the exhaust stroke to cool the cylinder. This all helps reduce the chance of knock and allows you to advance timing for more power.

That's pretty much it.

I've seen lots of info about issues with relatively low mileage carbon buildup on the intake valves with strictly direct injected engines, because the injector is no longer spraying fuel in the port and keeping things clean (they are usually pointed right at the back of the intake valve).

I believe some manufactures are using, or adding port injectors back to direct injection engines as well.

Direct injection is dirtier than port injection in regards to PM (particulate matter). In some cases, gasoline direct injected engines spew more PM than diesels, but much finer particulates than cannot be seen. This is why gasoline direct injection engines have soot on the pipes like old diesels used to before DPF's.

Benefits of direct injection....

You don't have to wait until the intake port opens to inject fuel into the cylinder. Therefor you can control injection timing and even have multiple injection events per stroke. You can wait until at the end of the compression stroke to inject the fuel so it doesn't pre-detonate. With a port injected engines, you have to inject the fuel into the cylinder on the intake stroke while the intake valve is open and run the risk of that fuel pre-detonating on the compression stroke before the spark plug ignites.

Because of this, direct injected engines can run at higher compression ratios then port injected engines making them more efficient. You can also inject a small amount of fuel on the exhaust stroke to cool the cylinder. This all helps reduce the chance of knock and allows you to advance timing for more power.

nickthehunter wrote:

parker.rowe wrote:
That link says it will be direct injected.

All the other information I have seen was pretty specific that it will be port injected.

EDIT: This must have been a typo on their part. In the engine cutaways you can clearly see it is port injected, and there is no where in the head casting they show for a second set of direct injectors.

I'll be honest, I am not in the market for a brand new truck. They are all out of my price range! But I have been checking every other day to see if ford has release the power numbers on the new 7.3 Gas.

So for a neophyte, what is the difference between direct injected and port injected and why does it matter?

Direct injection is directly into the combustion chamber(like diesel engines). Port the fuel is upstream and mixes with air through the intake valve. Theoretically direct injection can be cleaner with gains in mpg and power.

My gut feel is Ford will announce power numbers for the new 7.3 gas and the 3rd gen Power Stroke this September at the Texas State fair.

I'll be honest on this one, I am looking at replacing my old 2001 D2500. With a 360. And will be looking at a new fifth wheel at the same time. The new GM products claiming gasser tow caps around 17400 are intriguiging, I'd rather avoid a diesel. The new Ford is likely to be over 18k for a 5er.
I'm looking at a new 14k Montana, so these gasser articles are of interest to me.
But I hate the idea of buying a new powerplant in it's first two years of production.
So I'm watching, and fighting an internal battle.

Learjet wrote:


Federal emission laws apply all over this country...correct?

Yes, and? You can send the EPA after me if you want.

I find it funny that many people here do not even know the EPA emissions standards are, their actual limits, or the effect of those limits in contrast to lesser limits yet they will follow whatever the EPA tells them is good.

They are like yes EPA, I will gladly put DEF in my truck creating more trash from the jugs, get less fuel mileage, less reliability of my truck, create multiple plants to make DEF, multiple plants to make the plastic jugs, added trucks on the road to transport DEF from these plants all to lower NOx output from 1.2 g/hp-hr to .02 g/hp-hr which is thirty times lower than the European standard.

SidecarFlip wrote:
...Knowing this forum, I'm sure I'll get the usual snarky replies....

That's a pretty ironic statement coming from YOU!

parker.rowe wrote:
That link says it will be direct injected.

All the other information I have seen was pretty specific that it will be port injected.

EDIT: This must have been a typo on their part. In the engine cutaways you can clearly see it is port injected, and there is no where in the head casting they show for a second set of direct injectors.

I'll be honest, I am not in the market for a brand new truck. They are all out of my price range! But I have been checking every other day to see if ford has release the power numbers on the new 7.3 Gas.

So for a neophyte, what is the difference between direct injected and port injected and why does it matter?