This was just approximately 7k after walnut blast. It looks like a good idea to use the CRC valve cleaner at lease every other oil change. I will start doing this once spring comes.

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Were you getting any codes?

 

​​​​Never had any codes and even before blasting. It shows how quickly is can start building up around the valves.

 

Wow, that built up fast.

 

What's the mileage made up off? Mostly city and idling?

 

20 miles trips mostly with 30/70 country/city up to 55 mph but just odd trips on hwy/interstate.

 

That's crazy that they get like that so fast! Thanks for sharing

 

I wonder if there's something else going on. This looks excessive.

 

City driving is worse for buildup as you spend more time in the low rpms and accelerating which can cause more oil to be puked up by the pcv.

 

Off-roaders solve this problem completely forever by venting the crankcase to atmosphere.

 

I do fuel induction service once a year. Never did the walnut blasting because so far I never got codes

 

Interesting thought. Besides being bad for the environment would there be a down side to this? ( Re off road dump to atmosphere )

 

I tried to keep the oil residue from re-entering back through the intake with my own PVC system and catchcans. It would've been even worse I think with the combinations of oil soaked intake with carbon buildup.
We just have to live with these older DI engines with this issue. I think the newer engines have added port injections to solve this issue.

​​​​Just thinking how difficult to add some thing like th ZZP 5th Injectors just to keep your valves clean? I know it was meant for adding fuel for high HP build but what if they can use a smaller injectors and dial back fuel from the stock injectors to make them work together with a HPtune?

 

Did you do anything for the PCV in the intake manifold?

 

The seals depend on the slight vacuum from the PCV to prevent leaking. You could potentially have more seepage if vented to the atmosphere.

Without knowing the details of your setup you may have created a worse problem. Our system is extremely sensitive to pressures as it uses orifices rather than valves. Once you upset those pressure changes through the orifice you've screwed up how the entire system works.

 

Yes use the oem PCV but ran it to catch cans to capture the oil and prevent it from going back to the intake like the stock setup would and suck back into the valves.

 

A setup like Tom's in his how to?

 

Yes same idea but with different hardwares as tomj77 but on a TTR manifold.

 

And also would be interesting to see the impact of water / meth injection. Although it's not DI, I've been spraying the Cruze 1.4T for maybe 30,000 miles now. Someday soon I'll replace the intake when the PCV valve goes bad inside it and see what the intake manifold carbon build up looks like at least.

 

​​​​​​I am curious too if the meth does anything in keeping your valves clean?

 

Methyl Alcohol (Methanol) is an alcohol, so then I looked up engines combustion chambers that have been running on E85 (Ethyl Alcohol) and this is what I found: https://ls1tech.com/forums/fueling-i...l#post16478331

I'd say it would probably clean the valves if it is used often enough.

 

Large turbo, aftermarket intake manifold and a modified PCV system... Sorry but you have quite a few variables going on that are exacerbating the situation.

 

I don't see how all those 3 mods causes more buildup vs a stock setup?
​​​​​​Big turbo maybe with different tuning then stock, sure. As far as I can tell, it was tuned properly. No drivabiltily issues or codes AF is good.
As for PCV and intake are what making it worse I don't see it. PCV is working as it was intended to but with the. benefit of keeping the oil out of the intake. To further prove this. When I removed my stock intake a few years back to install this ttr intake, my oem was saturated with oil and puddles of oil were collected in the recess area on the head. That was when I installed my PCV setup to keep the oil out of my intake. Did my own cleaning of the valves brushes/cleaners at the same time. Better but not as well as blasting.
Then recently 28k miles later with no reasons to do the blasting I when ahead and had this done anyway. Removed the intake, valves were no where as bad as the first time and with similar mileage. No oil in the recess area, very light oil residue on the inside of the intake. The single catch can did not capture all the oil but it sure made a big difference. Hopefully with different catch can filter and duo setup they will capture even more oil.
Driving habits may play a larger part sure ... pcv and intake I don't see it.
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I cant see the meth making a huge difference. If you have ever scrubbed on those stubborn deposits with a dedicated cleaner, even using the cleaner with brushes require a good bit of effort. I dont think the occasional meth spray would do much, as I would think the oil mist would burn on the valve almost on contact and subsequent sprays of meth would evaporate off just as fast

 

Invention Idea: install a 5-gallon tank methanol injection system (water for warm climates) and then install a computer chip that will spray methanol more often even out of boost. The computer chip will be on the CAN bus to pick up speed, load, temps to compare against a map that is populated with PCV flow rates (the flow rates would be measured to develop the map). A sophisticated computer algorithm will take into account many factors including time, temp, rpm, and load to command specific volumes of methanol solution.

The cost of a system like this would need to compete with the cost of a single walnut blast cleaning.