Lambda II carbon build up solution (two stage injection) ??

[j4ypal]

Like many others, I am waiting for th new entries from Genesis (G80 and GV80), possibly for the 2020 model year. But the carbon build up problems that plague almost all GDI / DI engines have me a bit turned off.

I've read on another forum that the Lambda II engine integrates two stage injection, which would solve the carbon build up problem. BUT I have only read that in one post (see image). Nothing else corroborates this theory. Does anybody else have info in that regard?

Source: see thread here.

Other than that, I hope the new Lambda III engine integrates a solution to the carbon problem. Rumors say it's a 3.5L twin turbo: Genesis G80 to Debut in September in South Korea - Korean Car Blog

This source does not talk about anything in regards to the lambda II engine: 3.3L Engine (Lambda MPI/GDI/T-GDI) Specifications And Review on MotorReviewer.com
The twin turbo Lambda II engine code is: G6DP according to their info.

 

[carguy75]

The two stage method seems like a good method to reduce carbon deposit on the valves. I read that the 5.0 Tau engine also uses a similar technique to reduce valve deposits by adjusting the valve opening duration to reduce carbon deposits on the valve stems. I am not sure on how it works exactly, but the method has to do with the variable timing and variable valve lift system. It seem to be the same method you described.

I will pull my intake manifold at 100k miles to check my valve stems for carbon build-up and clean them if necessary.

 

[NLJ]

Why are you guys so worried about the Hyundai GDi engine?
The VW ones are the troublesome ones when it comes to Carbon buildup.
Not all GDi engines are prone to it!

 

[carguy75]

Why are you guys so worried about the Hyundai GDi engine?
The VW ones are the troublesome ones when it comes to Carbon buildup.
Not all GDi engines are prone to it!

Carbon build-up will be a problem for any GDI engine without a system to wash the valve stems clean with fuel. However, some engine design/methods are better than others. The early VW direct injection engines were known to be carbon fouled before 40k miles, however many late model engines uses valve timing tricks to keep the valves reasonably clean. Yet, without a true method to wash the valves with fuel the carbon issue is still present in our engine.

Hopefully, the method that Hyundai uses will keep the carbon build-up to a minimum. However, after about 100k miles I believe the intake valve will need to be cleaned to regain loss horsepower and fuel economy in our current models.

 

[ephone1]

Other than that thread on Bobs the oil guy, I haven't really been able to find a source stating that the 2-stage injection exists to prevent carbon build-up. Going off memory, I read somewhere that it only 2-stage injects while warming up, but I'm not sure about that either.

Low NOACK Volatility oil is heralded as a solution, but I saw an article on Bobs the oil guy's website that sited an SAE study that said the opposite - essentiay low NOACK oil vapors don't burn off when they do deposit on the valves. Interestingly, Valvoline's oil marked for direct injection engines has a high NOACK Volatility. It's hard to know what to believe.

On the plus side, these engines have been around for years, and I haven't read anything specifically about them having an issue.

 

[NLJ]

Carbon build-up will be a problem for any GDI engine without a system to wash the valve stems clean with fuel. However, some engine design/methods are better than others. The early VW direct injection engines were known to be carbon fouled before 40k miles, however many late model engines uses valve timing tricks to keep the valves reasonably clean. Yet, without a true method to wash the valves with fuel the carbon issue is still present in our engine.

Hopefully, the method that Hyundai uses will keep the carbon build-up to a minimum. However, after about 100k miles I believe the intake valve will need to be cleaned to regain loss horsepower and fuel economy in our current models.

Exactly but before fear mongering, how many reports have you heard about Hyundai GDi engines having such issues?
If it were an issue, the boards will be filled with concerns and complaints. The 3.3L has been out for a while.

 

[carguy75]

Exactly but before fear mongering, how many reports have you heard about Hyundai GDi engines having such issues?
If it were an issue, the boards will be filled with concerns and complaints. The 3.3L has been out for a while.

To be honest, I think that Hyundai has designed a technique for reducing carbon build-up, however carbon build-up is a common problem for direct injection engines. Hopefully, Hyundai method works very well so that no additional cleaning would be necessary.

You are correct about the 3.3 V6 being direct injected for a while(2012) and I have not heard about any well known carbon related issues with the design; so Hyundai may have gotten the design right so that carbon will not be an issue with its direct injection engines.

 

[j4ypal]

From what I've seen on forums and Youtube, there are several people that post problems regarding the model years around 2013. Here is an example:

The reason we don't see more cases for recent model years is that major problems do not appear until several years into ownership. My guess is we will start seeing problems pop up regarding the 3.3L twin turbo (ie. stinger and Genesis motor) in a few years when more people will have around 100k or more on their engine.

To be honest, I doubt Hyundai has implemented a solution for carbon problem. Otherwise we would have more proof that they fixed it.

I tried to contact SavageGeese about that since he is the only outlet I know that takes the time to explain these technical issues. His video is here:

 

[Sunny619]

These engine need oil catch cans to help with this issue.

 

[j4ypal]

Sunny, some of us do not like the idea of adding third party hardware to our cars. Also, SavageGeese mentioned that catch cans can lead to other problems if they are not properly sealed.

For me, I want en engine that will run well on its own. If Toyota can add port injection to their direct injection engines and fix it, why wouldn't Hyundai/Kia/Genesis be able to add a fix of their own? There is always the cost problem but if it means fixing a serious motor longevity problem, I would think it's worth it...

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[Sunny619]

Sunny, some of us do not like the idea of adding third party hardware to our cars. Also, SavageGeese mentioned that catch cans can lead to other problems if they are not properly sealed.

For me, I want en engine that will run well on its own. If Toyota can add port injection to their direct injection engines and fix it, why wouldn't Hyundai/Kia/Genesis be able to add a fix of their own? There is always the cost problem but if it means fixing a serious motor longevity problem, I would think it's worth it...

True but each their own. Trying to help others that may not know GDI motor we have has issues and catch can can help. These twin turbo motors are simple but delicate motor.
Heres a link to Help others.. it's very easy to install.

Heres a Kia Stinger installed super easy. This guy knows these motors very well

 

[Sunny619]

From what I've seen on forums and Youtube, there are several people that post problems regarding the model years around 2013. Here is an example:

The reason we don't see more cases for recent model years is that major problems do not appear until several years into ownership. My guess is we will start seeing problems pop up regarding the 3.3L twin turbo (ie. stinger and Genesis motor) in a few years when more people will have around 100k or more on their engine.

To be honest, I doubt Hyundai has implemented a solution for carbon problem. Otherwise we would have more proof that they fixed it.

I tried to contact SavageGeese about that since he is the only outlet I know that takes the time to explain these technical issues. His video is here:

Agree 100%. This engine with twin turbo is fairly ne