Ecoboost vs Hemi

Turtle n Peeps wrote:

ROBERTSUNRUS wrote:

Turtle n Peeps wrote:
The reason it's not a problem with tons of vehicles is because the way the vehicle is used.

Using DI vehicles for short trips is a no Bueno. Restart after restart after restart will build carbon up on the valves of ANY DI engines valves. This is a know FACT of any manufacture that makes DI engines; not just Ford. Oil and fuel fumes will build up over time on a warm valve when they are open after the engine stops.

Much like the turbo problems that the first gen 6.7 Cummins customers were experiencing it makes all the difference in the world on how one drives the vehicle. Many owners didn't know about this problem because they used their truck for heavy work. That didn't mean the problem didn't exist. It just meant those that drove their first gen 6.7 Cummins hard didn't have the problem.

You said: "I never heard of that with the 3.5L Ecoboost." When I give you a link that tells you about the problem you start talking about EGR's which have next to nothing to do with the problem. How do I know this? Because as you have pointed out, the 3.5 doesn't have EGR but still has the problem.

As far as being a "major" issue. I guess Ford disagrees with you because they don't pop out TSB's Willie Nillie.

:) Hi, virtually all gas engines will develop carbon build up with, as you put it, Restart, after restart, after restart. Or lots of short trips without enough time and distance to warm up properly. This goes way back into the carburetor days. Long before DI.

I don't know about how many engines you work on but you would be incorrect.

The thing that fixes the carbon issue is fuel wash over the valves. The thing that makes it so bad with DI is because there is no fuel wash. It's a dry intake system until the combustion chamber.

Remember the Techron commercials by Chevron? Techron is good stuff when it washes over the valves. It works very well. The problem with DI is it no longer washes over the valves so there is no cleaning action.

That's why Ford is fixing this issue with a double set of injectors. One to run on most of the time and one to wash the valves off every now and then depending on the tune.

The way Ford is doing it, it won't be a problem anymore even with cold run engines. It cost them a lot of money but with a 2 injector system, they are doing it correctly. They are the first to do the job correctly that I know of.

:) Hi, you don't know how many engines I have worked on????? My first overhaul was on a Ford V-8 Flathead. I was a mechanic in the Army. Then I was a new car dealer mechanic since 1968. I have touched a few engines in my time. In the late sixties and early seventies, Big V-8's had huge carbon problems. Retired from a Ford dealer in 2008.

What's your experience?