Joewee3.5

All of the talk of carbon buildup in DI engines including EB engines has left me with one question. Why isn't there build up inside the torture test engine that has 162000 equivalent miles? That engine was driven very hard and I wonder if that high heat, high rpm driving is what kept that engine clean. Any thoughts?

11screw50

I may be wrong but one of the issues I have with the torture test engine is that it didnt see enough start/stop cycles. I dont know if that would affect the carbon buildup though. That was one of my biggest concerns with the EB because it seems that everyone else who has done a DI turbo engine has had this problem. Maybe Ford solved it?

02themax

I don't think Ford solved anything. Google BGFUELTEST and you'll see what I'm talking about. The harder you run a DI engine the cleaner it will be but who does that on a daily basis. This was one reason I left the DI club for now, not hatin just sayin.

I think lexus is running a secondary injector to "wash" the valves like a regular injected engine but now you have double the injectors to worry about. I'm sure someone will figure this all out soon along with better injectors and less fuel pump failures.

jcain

just shove your foot In it now and then, Nancy

amascio

AFAIK my Mazdaspeed3 didn't have this problem; ran just as good at 60k miles as when it was new. Ford has had many dealings with Mazda during their partnership and they probably had a hand in the MS3 engine development.

We'll see how this turns out, but I'm not worried....

Monadh

140,000 miles on a DI turbo Subaru, no carbon build up. This is the first I have ever heard of this problem.

MadocHandyman

Of course BGFUELTEST is going to say there's a problem. They're trying to sell their additive!

NASSTY

Maybe carbon isn't building up in the EB engine? Maybe that's why all of that black crap comes out of the tailpipe?
I have no idea, just thinking out loud.

engineermike

Call me crazy, but when the fuel is injected directly into the cylinder, how does it go upstream to the intake valve to wash the carbon off with additive? My point is that if the fuel doesn't go there (the root cause of the supposed problem), then how would fuel with cleaner additive make it there?

Also, if you've ever taken apart a set of heads with >100k miles on a normally injected engine, they can have a large amount of buildup on the back of the intake valve also. I've seen way more buildup on old normally injected heads than the pictures showing a "big problem" with the DI engines.

Brad92

Just Seafoam it when the warranty goes out. Problem solved.