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Direct Injection - cleaning combustion chamber
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Fuel additives will only clean the D.I. injectors and the interior of the combustion chamber and will not touch the carbon on the backs of the valves.
To clean the backs of the valves, you will need to go through a vacuum line or the throttle body.
To clean the backs of the valves, you will need to go through a vacuum line or the throttle body.
BG Fuel Induction Service every 15-30k.
yes, to answer the question, it will clean the chambers.
depending on the DI system, if there is a backwash mode, ie combination of homogenous charge and atkinson cycle then the fuel and additive may act upon the valves.
depending on the DI system, if there is a backwash mode, ie combination of homogenous charge and atkinson cycle then the fuel and additive may act upon the valves.
Is it that big of a deal with gas DI engines? Heavy diesels are all direct injected and go well over 1 million miles without some form of intake valve cleaning. Even on the newer heavy diesels that have had CCV systems since 2007. Considering the amount of soot that is pumped back into the intake via EGR on these diesels, combined with CCV systems, the gassers hardly compare. Of course, the injectors themselves are critical and needs some help once in a while.
Originally Posted By: badtlc
Keeping the injectors clean will help reduce/prevent the intake valve deposits.
No it won't. This is direct injection we are talking about.
Originally Posted By: TiredTrucker
Is it that big of a deal with gas DI engines? Heavy diesels are all direct injected and go well over 1 million miles without some form of intake valve cleaning. Even on the newer heavy diesels that have had CCV systems since 2007. Considering the amount of soot that is pumped back into the intake via EGR on these diesels, combined with CCV systems, the gassers hardly compare. Of course, the injectors themselves are critical and needs some help once in a while.
Diesels run at slightly higher temps and don't have an vacuum acting on them. This is one of the many reasons diesels don't have the issue. Plus... [censored] EGR designs in gasoline DIs.
I drive a 1st gen DI gasoline engine... and it's horrible on the valves. All the oil blown past the PCV valve goes in through the intake and deposits everywhere. Catch can might help - but I'm already 125,000 miles in, so I'd need to do a full cleaning.
BMW has a procedure where they use walnut shells to sand blast the valves while closed then vacuum everything out. Too bad it's very easy to blow all that grit into your engine with the heads mounted... and no one wants to remove heads to clean something.
Seafoam or any similar solvent is every DI engine owners best friend. Can't do it often enough in some cases.
Keeping the injectors clean will help reduce/prevent the intake valve deposits.
No it won't. This is direct injection we are talking about.
Originally Posted By: TiredTrucker
Is it that big of a deal with gas DI engines? Heavy diesels are all direct injected and go well over 1 million miles without some form of intake valve cleaning. Even on the newer heavy diesels that have had CCV systems since 2007. Considering the amount of soot that is pumped back into the intake via EGR on these diesels, combined with CCV systems, the gassers hardly compare. Of course, the injectors themselves are critical and needs some help once in a while.
Diesels run at slightly higher temps and don't have an vacuum acting on them. This is one of the many reasons diesels don't have the issue. Plus... [censored] EGR designs in gasoline DIs.
I drive a 1st gen DI gasoline engine... and it's horrible on the valves. All the oil blown past the PCV valve goes in through the intake and deposits everywhere. Catch can might help - but I'm already 125,000 miles in, so I'd need to do a full cleaning.
BMW has a procedure where they use walnut shells to sand blast the valves while closed then vacuum everything out. Too bad it's very easy to blow all that grit into your engine with the heads mounted... and no one wants to remove heads to clean something.
Seafoam or any similar solvent is every DI engine owners best friend. Can't do it often enough in some cases.
Originally Posted By: camelCase
Originally Posted By: badtlc
Keeping the injectors clean will help reduce/prevent the intake valve deposits.
No it won't. This is direct injection we are talking about.
That is the answer from somebody who fails to realize it is a "system" and not just one part. DI injectors foul fairly easily. When they do, proper fuel vaporization doesn't occur within the chamber. This leads to incomplete combustion and fuel dilution. This fuel dilution increases the volatility of the oil. This in turn creates increased vapors through the PCV system.
So YES, as I said, keeping the injectors and combustion chamber clean can help reduce/prevent (AKA slow it down) the formation of intake valve deposits.
Originally Posted By: badtlc
Keeping the injectors clean will help reduce/prevent the intake valve deposits.
No it won't. This is direct injection we are talking about.
That is the answer from somebody who fails to realize it is a "system" and not just one part. DI injectors foul fairly easily. When they do, proper fuel vaporization doesn't occur within the chamber. This leads to incomplete combustion and fuel dilution. This fuel dilution increases the volatility of the oil. This in turn creates increased vapors through the PCV system.
So YES, as I said, keeping the injectors and combustion chamber clean can help reduce/prevent (AKA slow it down) the formation of intake valve deposits.
Last edited:
Originally Posted By: camelCase
Diesels run at slightly higher temps and don't have an vacuum acting on them. This is one of the many reasons diesels don't have the issue. Plus... [censored] EGR designs in gasoline DIs.
Guess you are not up to speed on diesel designs since EGR, DPF, SCR, and CCV have become part of the mix since 2010. The CCV allows, even with the filtration they have, some oil residue into that intake manifold. The EGR on diesels is notoriously laden with soot from the exhaust. Now combine those two things flowing past the intake valves and you can get a vivid mental image of what is going on. Yet, these engines do not undergo regular intake cleaning and last upwards of 1 million miles. Ever wonder why the oil is black almost within a few miles of a fresh oil change? And that is what is getting sucked up into the CCV filters and some is getting thru to combine with the EGR coming into the intake.
In relation to this, the DI gasser intakes would be relatively clean. Gas engines are not notorious for generating prodigious amounts of soot like diesels. This is why, at least on the surface, that putting a lot of worry into intake valve cleaning on a gasser seems like evidence of an inflamed paranoia gland. It is something to think about and consider at some point, but sure not something to lose sleep over.
Diesels run at slightly higher temps and don't have an vacuum acting on them. This is one of the many reasons diesels don't have the issue. Plus... [censored] EGR designs in gasoline DIs.
Guess you are not up to speed on diesel designs since EGR, DPF, SCR, and CCV have become part of the mix since 2010. The CCV allows, even with the filtration they have, some oil residue into that intake manifold. The EGR on diesels is notoriously laden with soot from the exhaust. Now combine those two things flowing past the intake valves and you can get a vivid mental image of what is going on. Yet, these engines do not undergo regular intake cleaning and last upwards of 1 million miles. Ever wonder why the oil is black almost within a few miles of a fresh oil change? And that is what is getting sucked up into the CCV filters and some is getting thru to combine with the EGR coming into the intake.
In relation to this, the DI gasser intakes would be relatively clean. Gas engines are not notorious for generating prodigious amounts of soot like diesels. This is why, at least on the surface, that putting a lot of worry into intake valve cleaning on a gasser seems like evidence of an inflamed paranoia gland. It is something to think about and consider at some point, but sure not something to lose sleep over.
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