mcginnpm
Registered Member
- Joined
- Jul 22, 2009
- Messages
- 424
- Reaction score
- 37
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- 28
- Location
- The Low Country of South Carolina
- Genesis Model Year
- 2017
- Genesis Model Type
- Genesis G80
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The problem is not cleaning the valves, but getting the cleaner to the valves where the crud accumulates. On a GDI engine, the gas is injected directly into the cylinder, bypassing the valves. This contrasts with EFI, where using gasoline with decent cleaning additives (such as Techron) will keep the valves reasonably clean.would a can of seafoam clean the valves?
Sounds like normal internet gossip about Amsoil. First of all, Amsoil makes three different "synthetic" motor oils, and only one of them is entirely Group IV or V components (aka "real" synthetic). But that motor oil is not API approved and it does not meet other Hyundai specs for the Genesis. It is also very expensive.I've read that true synthetic oils (such as Amsoil) help due to a lower NOACK volatility
My next vehicle s probably going to have an engine like the Toyota V6 engine mentioned earlier in this thread, that uses a combination of DGI and EFI to make sure that the back of the valves get some gasoline to keep them clean.
If you read this article, Toyota seems to claim the D-4S engine cleans the valves.Is there any concrete data the Toyota D4S system will actually keep the intake valves clean? Yes, it does use port injection a small minority of the time, but I have yet to see where even Toyota will claim it will solve the intake valve issue. From what I can find out it was added to solve upcoming more stringent emissions requirements. As I understand it, Audi has went to a dual injection in Europe to meet emissions, but not yet in the United States, and they historically have had one of the worst struggles with intake valve deposits. It will be interesting to see what the test of time reveals with D4S. Sadly, it's all about the bottom line, and manufacturers know the vast majority of owners will not notice any issues until the warranty has passed.
If you read this article, Toyota seems to claim the D-4S engine cleans the valves.
http://wardsauto.com/technology/toyota-advances-d4s-self-cleaning-feature-tacoma
Here is an excerpt from the article link above:
The automaker believes it has solved the conundrum of carbon build-up on injectors with a new self-cleaning feature for D-4S, a technology that debuted 10 years ago on the ’05 Lexus GS 350 and ’06 Lexus IS 350 and today is used in the current-gen Lexus IS, GS and RC and Scion FR-S sports car.
“What we’re doing is we have a slit on the side of our injector and we’re blowing that carbon off,” Mike Sweers, the ’16 Tacoma’s chief engineer, tells WardsAuto here during the truck’s media preview. “If we tried to use just high pressure, using just the nozzle itself, you would clean the bottom of that nozzle.
“But since the carbon grows from the outside and comes around, you would still plug up that injector,” he adds. “So by cleaning on the outside of that, we get a clean injector all the time.”
Drivers may hear the self-cleaning taking place during a hot idle, and the process could last from 10 seconds to as long as 10 minutes, depending on driving patterns and the amount of build-up on the injectors.
“When you go into a hot-idle situation, the system is going to look at the time that it ran, the number of cycles the injectors went through, the temperature of the injectors and then it goes into a self-cleaning mode,” Sweers says. “Because we have the port injection, I can continue idling the engine without having any side effects.”
He compares the technology to a self-cleaning oven, as no additives are necessary.
“You stop at a light (and) it may clean for 10 seconds, you’re going to take off and stop at another light and it’s going to clean for (another) 10 seconds,” he says, noting the engine will deliver torque when a driver wants it and shut off the cleaning mode.
The 10-minute cleaning cycle occurs during longer idling, such as in a drive-thru line.
After reading the above Toyota article again, it talks about self-cleaning of the injectors, but does not mention valves. So I am not sure what that means with regard to possible carbon build up on the valves.
I would not rule out the possibility that the Toyota engine does spray gas on the back side of the intake valves to keep carbon buildup from happening (assuming the use of a good quality gas with proper levels of detergents). It is just that they don't specifically mention that in the article.Rats! You are correct... I did not read it close enough either... Virtually all vehicles (with one manufacturer exception I am aware of, Subaru) are DI. So, when advising our kids and grandkids as to a vehicle purchase, and presuming not a Subie, at least get one with the intake manifold on the front side of the engine. (Presuming a sideways-mounted 4-banger).
Has the dealer said anything about that mod?
Did you paint the foam covers as well in the rear? if so what paint did you useI got around to painting it up this weekend. See the attached photo. Post #1 has the "before" photos.
Miles ml ml/ 500 miles fl-oz/500 miles miles/1 ml miles/1 fl-oz
1600 30 9.4 0.3 53.3 1577.3
2500 60 12.0 0.4 41.7 1232.2
10000 200 10.0 0.3 50.0 1478.7
15000 270 9.0 0.3 55.6 1643.0
22500 420 9.3 0.3 53.6 1584.3
5000 30 3.0 0.1 166.7 4928.9 My (bubbaG80Sport) results
Average 8.8 0.3 70.1 2074.1