Direct Injection = Carbon Buildup?
I work at a bmw dealer and we have a cleaning system that uses walnut shells to clean the intake port and valve. It only takes a couple of hours and its as good as new. I wonder since the lt1 is N/A if it will see less oil in the intake track then some of the turbo german engines that have been discussed.
Yea its on car. You just pull the intake manifold. They have a piece that fits in the port that attaches to a vacume that sucks the shells and **** out while you blast through a metal tube.
Is it difficult to get the work accepted under warranty? My buddy at audi says its as easy as anything else as long as they provide some details to the history of the vehicle including a scan.
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A really easy way to get some solvent on the valves would be to install a meth injection kit. Meth is used on N/A engines as well. Just run a real small nozzle on a WOT/ or vacuum switch and every time you nail it, the engine will self clean. Another advantage would be, being able to add more timing=more power, or run lower grade fuel=less cost to drive.
TECH Apprentice
Joined: Apr 2012
Posts: 333
Likes: 4
From: New Zealand
This would likely prevent build up. It has been proven to work in many applications I can't see why it would not work in direct injection
http://www.moreyoil.co.nz/moreys-upp...ector-cleaner/
It's a simple lubricating cleansing mixture that drips into the intake system and cleans the valves and ports while lubricating the same. Has worked very well in older engines that hated unleaded fuels. 650:1 ratio makes it economical to use.
http://www.moreyoil.co.nz/moreys-upp...ector-cleaner/
It's a simple lubricating cleansing mixture that drips into the intake system and cleans the valves and ports while lubricating the same. Has worked very well in older engines that hated unleaded fuels. 650:1 ratio makes it economical to use.
Yeah, that'll work great with the injectors spraying on the back of the valves... Oh, wait.
The carbon buildup on the valves is the result of oil making it's way past the valve guides. Barring some sort of technology change, you *need* oil to make it's way down the guides to lubricate the valve stem, just in tiny amounts. Without fuel spraying on the valves, they're going to run hotter, which will lead to oil coking. I don't know how they managed to alleviate this, or if they really did at all.
The buildup on the valves has very little/nothing to do with PCV vapors.
The carbon buildup on the valves is the result of oil making it's way past the valve guides. Barring some sort of technology change, you *need* oil to make it's way down the guides to lubricate the valve stem, just in tiny amounts. Without fuel spraying on the valves, they're going to run hotter, which will lead to oil coking. I don't know how they managed to alleviate this, or if they really did at all.
The buildup on the valves has very little/nothing to do with PCV vapors.
A really easy way to get some solvent on the valves would be to install a meth injection kit. Meth is used on N/A engines as well. Just run a real small nozzle on a WOT/ or vacuum switch and every time you nail it, the engine will self clean. Another advantage would be, being able to add more timing=more power, or run lower grade fuel=less cost to drive.
however most folks that own those hi end vehicles, will prolly not remember or care to replenish the container. only straight meth found at retail stores is HEET.
a hot rod, gear head, car guy will have no problem with periodic maintenance of the meth injection device. but i just dont see it from ppl who take the cars to dealers for all basic service. most of these folks are just gas up and go. never look under the hood themselves
Yeah, that'll work great with the injectors spraying on the back of the valves... Oh, wait.
The carbon buildup on the valves is the result of oil making it's way past the valve guides. Barring some sort of technology change, you *need* oil to make it's way down the guides to lubricate the valve stem, just in tiny amounts. Without fuel spraying on the valves, they're going to run hotter, which will lead to oil coking. I don't know how they managed to alleviate this, or if they really did at all.
The buildup on the valves has very little/nothing to do with PCV vapors.
The carbon buildup on the valves is the result of oil making it's way past the valve guides. Barring some sort of technology change, you *need* oil to make it's way down the guides to lubricate the valve stem, just in tiny amounts. Without fuel spraying on the valves, they're going to run hotter, which will lead to oil coking. I don't know how they managed to alleviate this, or if they really did at all.
The buildup on the valves has very little/nothing to do with PCV vapors.
On The Tree
Joined: Jul 2010
Posts: 158
Likes: 1
Poppet valves and DI technology don't mix well together. It might dead end the technology as we know it. I'd look toward a rotary valve assembly or a small back step to a hybrid port/di injection to keep the valves clean.
Either way, it means money to us technicians. It's been a long time since we had a good systemic failure to make a living on.
Either way, it means money to us technicians. It's been a long time since we had a good systemic failure to make a living on.
TECH Enthusiast
Joined: Jan 2005
Posts: 697
Likes: 0
From: On a car lot, shopping...
Seafoam has shown to be marginal at best on the VW/Audi front so I wouldn't see it being of benefit in a new LT1.
VAG has had DI since 05 at least. The 05 A4 had the same 2.0t that was used in GTI's/GLI's in 06.While carbon build up is a issue, it can be cleaned by a do-it-yourselfer, in a day. I would think most BMW guys just pay someone else. NOTE: I said MOST, not all.
The VW guys debate the catch can issue at length. Much like removing the screen from the MAF of a F-body. While it hasn't really effected anything it isn't really hurting either. My GTI is APR stage 2 with a uncatted downpipe and 102000 miles. I have never had the valves cleaned. I haven't had my car scanned with VAGCOM to see it is pulling timing out do to a ping issue caused by large carbon build up either though. I probably should. And I should also take the intake off and check the valves and possibly clean them. It wouldn't hurt.
All that said DI, like many other fuel delivery technologies, has pro's and con's. Same can be said about a carb, or tbi or tpi. As much as I would love to hear GM got this right the first time, I can't help think that this is the same company that released its most powerful small blocks (LT1's and LS1's) and backed them with their smallest 10 bolt rear end.
The 2006+ VW GTI has this exact problem and there are a lot of those cars out there. From what I have read on the VW forums a catch can doesn't solve the problem. Its been said that the deposits are also from the accumulation of oil that slips past the valve guide seals.
Makes sense to me since no valve guide seal is going to seal perfectly, and small amounts slip past whenever the car is running, and probably the most when the intake manifold is seeing high vacuum.
Makes sense to me since no valve guide seal is going to seal perfectly, and small amounts slip past whenever the car is running, and probably the most when the intake manifold is seeing high vacuum.
All that said DI, like many other fuel delivery technologies, has pro's and con's. Same can be said about a carb, or tbi or tpi. As much as I would love to hear GM got this right the first time, I can't help think that this is the same company that released its most powerful small blocks (LT1's and LS1's) and backed them with their smallest 10 bolt rear end.