[mdhopt36]

Mmmm good pics by triple 7, and 'splain by hotlap.

Now another question-
If owner is concerned by carbon buildup, do the engineers recommend- WHAT?

Bead blasting? Total dismantle of heads? Replace valve guides?

(I think it might be the former---if done by a COMPETENT mechanic.

[mdhopt36]

Another interesting possibility! Water injection.......

[Deputy Dog]

Originally Posted by hotlap

This?

I think what he is saying is..we see the gunk build up in the pics on a cooled engine, but when driving at op temp. all that gunk his harmless because it is melted/dissolved and liquified at hi temp.

[CrazyCatGuy]

Originally Posted by mdhopt36

Mmmm good pics by triple 7, and 'splain by hotlap.

Now another question-
If owner is concerned by carbon buildup, do the engineers recommend- WHAT?

Bead blasting? Total dismantle of heads? Replace valve guides?

(I think it might be the former---if done by a COMPETENT mechanic.

Walnut blasting is the preferred method from what I've seen on other makes.

[Nsxmatt]

Originally Posted by CrazyCatGuy

Walnut blasting is the preferred method from what I've seen on other makes.

When they get to the point the valves won't seat then yes that's it. On the newer engines, it doesn't look like it will ever get to that point. GM makes a top engine cleaner you inject with the engine running which will do just fine. The thing with DI is there is no injector flow through the valve to clean it to the level people expect with a manifold injected car. Doesn't mean it's doing harm, just means it's not pristine like people are used to.

[Intimidator]

I was never a fan of catch cans....I changed my oil at 500 miles, 1500 miles, and at 5000 miles. Took my car to Weapon-X for a full build just after the 5000 mile change. Ben talked me into the EE2...and I'm Thankful he did. When I changed my oil at 8500 miles last week, this was the result....and that is good enough for me!
The next part of the build will include the Weapon-X secondary Port injection anyway, but the CC definitely does it's job!

The only reason I pulled the CC to drain, is that I need bifocals and couldn't remember how the valve turned! Now I'm good! lol

[Nsxmatt]

Originally Posted by Intimidator

I was never a fan of catch cans....I changed my oil at 500 miles, 1500 miles, and at 5000 miles. Took my car to Weapon-X for a full build just after the 5000 mile change. Ben talked me into the EE2...and I'm Thankful he did. When I changed my oil at 8500 miles last week, this was the result....and that is good enough for me!
The next part of the build will include the Weapon-X secondary Port injection anyway, but the CC definitely does it's job!

The only reason I pulled the CC to drain, is that I need bifocals and couldn't remember how the valve turned! Now I'm good! lol

You can't really compare a fully built forced induction motor with stock cars. Nobody is denying a built motor pushing higher boost is going to push more oil. That has nothing to do with the engine being DI or build up on valves.

[Intimidator]

Originally Posted by Nsxmatt

You can't really compare a fully built forced induction motor with stock cars. Nobody is denying a built motor pushing higher boost is going to push more oil. That has nothing to do with the engine being DI or build up on valves.

Agreed, but some guys will go through all of this and come to the conclusion that they aren't needed on built motors either! Just showing that side!

[MackSteelPrivateEye]

Originally Posted by Nsxmatt

When they get to the point the valves won't seat then yes that's it. On the newer engines, it doesn't look like it will ever get to that point. GM makes a top engine cleaner you inject with the engine running which will do just fine. The thing with DI is there is no injector flow through the valve to clean it to the level people expect with a manifold injected car. Doesn't mean it's doing harm, just means it's not pristine like people are used to.

Well I think Fords 5.4 Mustang offers a dual injection system whereas secondary jets spray the valves to keep them clean.

[Nsxmatt]

Originally Posted by MackSteelPrivateEye

Well I think Fords 5.4 Mustang offers a dual injection system whereas secondary jets spray the valves to keep them clean.

Correct, and it can also be used in startup so it doesn't dilute the gas as much.

[Intimidator]

The LT5 has direct and port injection...that's the way I'm headed also!

[CrazyCatGuy]

Originally Posted by Intimidator

The LT5 has direct and port injection...that's the way I'm headed also!

This is the way the MK7 Golf R in Europe is set up.

I haven't done much research, but can the LT5 direct and port injection systems be used on the LT1? Is this something that people have done yet?

[Whocares05050]

Originally Posted by Nsxmatt

How does fuel magically turn to carbon?

You may wanna get your vision checked. Where did i say fuel turns to carbon?

[Nsxmatt]

Originally Posted by Whocares05050

You may wanna get your vision checked. Where did i say fuel turns to carbon?

So you’re saying the carbon deposits on the backs of the valves are from oil?