GDI engine care.

[chronic]

Toyota & Lexus use D4-S for their Cars

 

[EXBMWGUY]

^ This subject is in other threads under "carbon buildup", as well as hundreds or even thousands of hits online. As virtually all manufacturers are changing to DI, they will all have to have solutions before it costs them too much in warranty costs or bad will with customers. Some have already, such as Toyota with its extra intake port. Others have made adjustments with variable valve timing. Active removal using abrasion (walnut shell particles, etc.) is the only way to completely clean intake valves. That also requires know-how, the right equipment, and the time to expose the valves - and not less than $500.

Good gas won't do anything directly because it never reaches the valves. High quality synthetic oil may extend the time before a proper cleaning is needed. It will not prevent it. A catch can may be the easiest, cheapest solution because it should trap the oil mist before it gets to the intake.

 

[chronic]

^ This subject is in other threads under "carbon buildup", as well as hundreds or even thousands of hits online. As virtually all manufacturers are changing to DI, they will all have to have solutions before it costs them too much in warranty costs or bad will with customers. Some have already, such as Toyota with its extra intake port. Others have made adjustments with variable valve timing. Active removal using abrasion (walnut shell particles, etc.) is the only way to completely clean intake valves. That also requires know-how, the right equipment, and the time to expose the valves - and not less than $500.

Good gas won't do anything directly because it never reaches the valves. High quality synthetic oil may extend the time before a proper cleaning is needed. It will not prevent it. A catch can may be the easiest, cheapest solution because it should trap the oil mist before it gets to the intake.

but Toyota's dual injection system D-4S is not just for carbon buildup purpose. But it actually improves power, economy & emissions performance;

http://www.sae.org/automag/techbriefs/01-2006/1-114-1-17.pdf

 

[T_E]

Hyundai recommends top tier gasoline, or at least a fuel injector cleaner at every oil change if not using top tier gas.

Also, one dealer told me to drive it hard periodically to get rid of carbon..he was also a Ford dealer and said they had recommended that on the Ford modular engines.

Do either of these recommendations really make a difference?

 

[Mark_888]

Hyundai recommends top tier gasoline, or at least a fuel injector cleaner at every oil change if not using top tier gas.

Also, one dealer told me to drive it hard periodically to get rid of carbon..he was also a Ford dealer and said they had recommended that on the Ford modular engines.

Do either of these recommendations really make a difference?

If you go to the top tier website, you can see which brands now are top tier gas, so that would be the easier solution. Occasional use of fuel injector cleaner is a good idea, but every fill up is ridiculous.

Using a top quality synthetic oil is also a good way to keep your engine internals clean.

 

[sandy]

Lease, don't buy!

 

[Mark_888]

Lease, don't buy!

Suze Orman is going to give you a severe spanking.

 

[RonJ]

If you go to the top tier website, you can see which brands now are top tier gas, so that would be the easier solution. Occasional use of fuel injector cleaner is a good idea, but every fill up is ridiculous.

Using a top quality synthetic oil is also a good way to keep your engine internals clean.

Additives in the fuel will not hit the neck of the intake valve to do any cleaning regardless of the additives or detergents in the fuel on a GDI engine.

Synthetic oil may help, don't know though. Oil separator in the PCV system may help. I'm repeating myself.

Google AUTOMOTIVE OIL SEPARATOR, lots of info out there.

RonJ

 

[sandy]

Suze Orman is going to give you a severe spanking.

I might like that

 

[Mark_888]

I might like that

Unfortunately for you, she is a lesbian.

______________________________

Help support this site so it can continue supporting you!

 

[kf4zra]

Will do nothing to clean the backs of the valves.

its a solvent, and introduced through the vacuum line as I wrote, it will indeed hit the back of the intake valves. I have to imagine it will do something.

Can you elaborate as to how you know it will do nothing?

 

[zielritter]

A better solution (I think) is a simple oil capture stage in the PCV return line to keep the oil from building up in the first place.

This is exactly what I did at about 2000 miles. I used an air compressor water separator and added a screen and steel wool capture medium to "grab" the droplets as they fall into the container..

You would be amazed at the amount and viscous nature of the blow by gunk that gets captured in the separator in between oil changes. I would imagine after ingesting this crap for thousands of miles at least some of it would start to get baked onto the valves on a GDI engine.

 

[NSXNEXT]

This is exactly what I did at about 2000 miles. I used an air compressor water separator and added a screen and steel wool capture medium to "grab" the droplets as they fall into the container..

You would be amazed at the amount and viscous nature of the blow by gunk that gets captured in the separator in between oil changes. I would imagine after ingesting this crap for thousands of miles at least some of it would start to get baked onto the valves on a GDI engine.

Got any pics to show the install?

 

[kf4zra]

Got any pics to show the install?

very interested as well

 

[zielritter]

Got any pics to show the install?

I'll need to take some. It's really not difficult to do. Just disconnect the hose that is connected to PCV valve near the throttle body, add separator to end of that hose, and then add a new hose between the separator and PCV valve.

 

[GRIFF]

It surprises me that with the increasing trend to GDI engines for the sake of improved mileage and performance that the engine manufactures have not considered the potential detrimental effect of the crankcase blowby on the intake valves. GM by recommending "de carbonization" of their engines recognizes something, but they are the only ones I know of so far.

The lower intake air temps may help to some-what reduce the surface temps of the intake valves. Perhaps Hyundai did consider this and felt that no preventative measures were necessary. From what I see, Hyundai is using More GDI engines through-out their line-up, GM uses them and I believe Ford has also been using them for a few years in some models.

Griff

 

[zielritter]

It surprises me that with the increasing trend to GDI engines for the sake of improved mileage and performance that the engine manufactures have not considered the potential detrimental effect of the crankcase blowby on the intake valves. GM by recommending "de carbonization" of their engines recognizes something, but they are the only ones I know of so far.

The lower intake air temps may help to some-what reduce the surface temps of the intake valves. Perhaps Hyundai did consider this and felt that no preventative measures were necessary. From what I see, Hyundai is using More GDI engines through-out their line-up, GM uses them and I believe Ford has also been using them for a few years in some models.

Griff

Out of curiosity, what makes the intake charge temperature cooler for a GDI engine?

I did also add the standard throttle body coolant bypass "mod" to my Genesis too. I know it's not a huge factor on the intake temp, but it probably keeps it somewhat lower at the engine top operating temp.

 

[radicaltimes]

Diesel engines have used direct injection for a long time and trucks put over a million miles on their engines. There is a lot of blow by with them. And they have no problems with the intake valves.
This may be worrying about nothing. Direct injection is not a new thing.

 

[zielritter]

Diesel engines have used direct injection for a long time and trucks put over a million miles on their engines. There is a lot of blow by with them. And they have no problems with the intake valves.
This may be worrying about nothing. Direct injection is not a new thing.

It's a bit of a concern for gasoline engines as there have been recent horror stories (I think it was Audi or BMW; too lazy to Google right now) of engines losing a lot of power and mileage due to poorly designed GDI set ups and valve build up. The only way to fix was to have the the block broken down and blasted with walnut shells. Expensive and not covered under warranty if I recall.

Didn't someone also post a pic of their 5.0 GDI on this forum that showed some degree of build up on the valves after 15k or so miles? It's an issue, but there's no conclusive evidence that it will negatively impact the performance of Hyundai GDI engines yet.

 

[Mark_888]

Toyota/Lexus has introduced engines with direct and port fuel injection combined to solve these problems. I believe this is called their D4-S system. The Lexus GS V6 350 engine has this technology.