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Prevent Carbon build up ?

George Ab

Drag Racing Champion
Location
Pacific NW
I use google advanced https://www.google.com/advanced_search to search the forum and input "carbon buildup" site:www.golfmk7.com. Just a few keystrokes. Here is just a few of the threads I pulled up. The search feature the forum provides leads much to desire. I hope this assists the "search challenged".

I have used the CRC cleaner once. Likely would help reduce if done every 10,000 miles. The last thread is quite useful on those who want to do it themselves.

https://www.golfmk7.com/forums/showthread.php?t=6752
https://www.golfmk7.com/forums/showthread.php?t=36192
https://www.golfmk7.com/forums/showthread.php?t=22262
https://www.golfmk7.com/forums/showthread.php?t=48680
https://www.golfmk7.com/forums/showthread.php?t=35472
 
Last edited:

uberpolka

Go Kart Newbie
Location
Portland
Car(s)
2017 GTI
I use google advanced https://www.google.com/advanced_search to search the forum and input "carbon buildup" site:www.golfmk7.com. Just a few keystrokes. Here is just a few of the threads I pulled up. The search feature the forum provides leads much to desire. I hope this assists the "search challenged".

I have used the CRC cleaner once. Likely would help reduce if done every 10,000 miles. The last thread is quite useful on those who want to do it themselves.

https://www.golfmk7.com/forums/showthread.php?t=6752
https://www.golfmk7.com/forums/showthread.php?t=36192
https://www.golfmk7.com/forums/showthread.php?t=22262
https://www.golfmk7.com/forums/showthread.php?t=48680
https://www.golfmk7.com/forums/showthread.php?t=35472






QFT


I never any forums search function, just google and filters
 

shortyb

Autocross Newbie
Location
Upstate SC
Car(s)
Felon Taxi,Dad Wagon
Thank you for posting that for all the people who say an OCC isn't necessary.

I think a lot of us have seen that kind of result from older TSI Gens and FSI engines. The Gen 3 has a much more sophisticated PCV/breather system and produces way less oil/water vapor mist. There are several that have installed OCCs on their MkVIIs that have little to no residual in the can when drained. So, broadly, an OCC may be beneficial for an older engine in that it will catch the residual, but even then it has not really been proven that this doesn't simply burn off or in fact produce more deposits.
 

Hotfart

Ready to race!
Location
LFK Kansas
Ethanol blends burn super clean, for those with the option. Above E40ish there is a huge reduction of carbon.

I admittedly haven't done much reading on the subject, but I was under the impression that with DI engines, fuel type/quality doesn't really have an effect one way or the other on carbon build up, since fuel never touches the valves. I'm sure I'm overlooking something here.

I've ran E40 for most of the life of my car, so I certainly hope you're right!
 

Sandman GTI

Drag Race Newbie
Location
Tennessee USA
I think a lot of us have seen that kind of result from older TSI Gens and FSI engines. The Gen 3 has a much more sophisticated PCV/breather system and produces way less oil/water vapor mist. There are several that have installed OCCs on their MkVIIs that have little to no residual in the can when drained. So, broadly, an OCC may be beneficial for an older engine in that it will catch the residual, but even then it has not really been proven that this doesn't simply burn off or in fact produce more deposits.

The few times I have removed my hose to the turbo inlet pipe, there is always a light oil at the bottom of the inlet. Either as you mentioned the MK7 is less or maybe the solids count is lower so build up is slower. Could the oil be lighter and the canister seperator maybe not work as well as older models?
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
This is an endless shit fight. Most of us have demanding lives outside this forum, that's why I leave the searching for those that have too much free time on their hands. I search occasionally, but nowhere near as much as demanded by the die hard priests of the "use the search function" cult.

+1. Same here.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
I think a lot of us have seen that kind of result from older TSI Gens and FSI engines. The Gen 3 has a much more sophisticated PCV/breather system and produces way less oil/water vapor mist. There are several that have installed OCCs on their MkVIIs that have little to no residual in the can when drained. So, broadly, an OCC may be beneficial for an older engine in that it will catch the residual, but even then it has not really been proven that this doesn't simply burn off or in fact produce more deposits.

If you install an OCC without the PCV delete it's a waste of money.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
Ethanol blends burn super clean, for those with the option. Above E40ish there is a huge reduction of carbon.




VW removed it in South America, I wouldn't expect it to come here.

How does ethanol regardless of the percentage reduce carbon build up on the valves in a GDI engine?
 

shortyb

Autocross Newbie
Location
Upstate SC
Car(s)
Felon Taxi,Dad Wagon
If you install an OCC without the PCV delete it's a waste of money.

Ah, now THAT would certainly make a difference since it would replace the function of the OE breather.
 

shortyb

Autocross Newbie
Location
Upstate SC
Car(s)
Felon Taxi,Dad Wagon
How does ethanol regardless of the percentage reduce carbon build up on the valves in a GDI engine?

Since ethanol isn't a petroleum based fuel, it doesn't have all the messy byproducts petro fuel does when burned. This means less precipitants in the blowby vapor to settle on valves and create deposits. The jury is still out on whether or not it actually has a cleaning effect through PCV vapor, but if it does, it would take a loooooong time regardless of the percentage blended. If you started from mile 0 and used it religiously, I imagine it would keep things cleaner longer, but eventually all GDI engines are going to succumb to deposit formation on the valves and other surfaces not washed by fuel. Nature of the beast.
 

Hoon

Autocross Champion
Location
Rhode Island
Since ethanol isn't a petroleum based fuel, it doesn't have all the messy byproducts petro fuel does when burned. This means less precipitants in the blowby vapor to settle on valves and create deposits. The jury is still out on whether or not it actually has a cleaning effect through PCV vapor, but if it does, it would take a loooooong time regardless of the percentage blended. If you started from mile 0 and used it religiously, I imagine it would keep things cleaner longer, but eventually all GDI engines are going to succumb to deposit formation on the valves and other surfaces not washed by fuel. Nature of the beast.

This.

It just doesn't produce carbon. Running E50 it took months for the inside of a new exhaust to get dark. Remove spark plugs above E50 and they are just caramel in color, no carbon on them. Really amazing fuel, hence the avatar of riding on corn.

I'm adding port injection and full E85 in about 2 weeks. That will clean everything right out.
 

shortyb

Autocross Newbie
Location
Upstate SC
Car(s)
Felon Taxi,Dad Wagon
The few times I have removed my hose to the turbo inlet pipe, there is always a light oil at the bottom of the inlet. Either as you mentioned the MK7 is less or maybe the solids count is lower so build up is slower. Could the oil be lighter and the canister seperator maybe not work as well as older models?

I just think it's due to much less oily vapor present in the pcv/breather system of a Gen 3 engine because of it's efficiency vs older ones.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
Since ethanol isn't a petroleum based fuel, it doesn't have all the messy byproducts petro fuel does when burned. This means less precipitants in the blowby vapor to settle on valves and create deposits. The jury is still out on whether or not it actually has a cleaning effect through PCV vapor, but if it does, it would take a loooooong time regardless of the percentage blended. If you started from mile 0 and used it religiously, I imagine it would keep things cleaner longer, but eventually all GDI engines are going to succumb to deposit formation on the valves and other surfaces not washed by fuel. Nature of the beast.

I use an OCC for blowby. As you said it would take some very long term testing of consistently using a high percentage of ethanol before any benefit from vapor could be proven to reduce carbon buildup on the valves. MPI would help greatly but is very expensive. If someone made a throttle body with injection it would not only help keep the valves clean but the entire intake tract and be less expensive than MPI.
 

shortyb

Autocross Newbie
Location
Upstate SC
Car(s)
Felon Taxi,Dad Wagon
I use an OCC for blowby. As you said it would take some very long term testing of consistently using a high percentage of ethanol before any benefit from vapor could be proven to reduce carbon buildup on the valves. MPI would help greatly but is very expensive. If someone made a throttle body with injection it would not only help keep the valves clean but the entire intake tract and be less expensive than MPI.

If someone made a post TB spacer with injection capability I'd be spraying methanol. THAT would definately clean and keep IATs in the freezer :D.
 
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