[dzenno]

Originally Posted by ianthegreat

It's only air, and in some cases meth or no2, that pass through here correct? So.. aside from the carbon buildup causing a sealing issue (simple compression test), I can't see how this build up REALLY negatively affects the engine.. yet. Obviously in extreme cases it could alter the flow of air, but is it really that bad?

Nothing really damaging, only loss of power..

[ianthegreat]

Originally Posted by dzenno

Nothing really damaging, only loss of power..

Would the loss of power be because of compression or inadequate air flow?

Edit- Reason I ask is because if we are setting to TDC, then we can't clean the lining of the valves anyway. Which leaves only one thing, air flow. And I don't know if it really effects air flow (that much). Would be interesting to see a before/after dyno.

[dzenno]

Air flow volume and turbulence

[ianthegreat]

Originally Posted by dzenno

Air flow volume and turbulence

Yea, you're probably right. More air flows through than I realize.

[Transport3r]

the amount of air that goes into the cylinder while the valves are open is a function of the mass flow past the valves. This in turn is dependent largely on the air pressure in the manifold, and the restriction the air sees to pass the valves. think of having a garden hose that has a lot of crud on its sidewalls, effectively making the contact area rough, causing the flow to be more turbulent than the ideal case.

This carbon buildup will cause loss of power and fuel economy, which is why we need to figure out the best way of keeping this crud away from our valves.

[Qmax03]

Took my manifold off when it blew up last season.. and my valves were CLEAN... been running meth since 2k miles on the car..and now with 19k they are still fairly clean !

[bulldog_yyc]

does type of fuel play a role? For example, Shell v-power has nitrogen and other detergents that claim to keep valves clean:

Shell V-Power gasoline contains the highest concentration of our NEW Nitrogen Enriched Cleaning System, a unique, patented improved formula exclusive to Shell. With five times the amount of cleaning agents required by the Canadian national standards for detergency in gasolines, Shell V-Power gasoline provides maximum protection, seeking and destroying engine gunk left behind by lower-quality gasolines even faster than Nitrogen Enriched Shell Bronze gasoline. Sustained use removes the gunky build-up from your vehicle’s intake valves and fuel injectors, making your engine cleaner and protecting it from developing additional build-up.

http://www.shell.ca/home/content/can.../shell_vpower/

[Jake@MOTIV]

Originally Posted by turkish335

does type of fuel play a role? For example, Shell v-power has nitrogen and other detergents that claim to keep valves clean:


http://www.shell.ca/home/content/can.../shell_vpower/

Direct Injection cars have fuel injected straight into combustion chamber so no fuel runs over the valves. This is the issue and why all DI platforms are trying to figure out "fixes" for keeping them cleaner.

[Jeff@TopGearSolutions]

Originally Posted by turkish335

does type of fuel play a role? For example, Shell v-power has nitrogen and other detergents that claim to keep valves clean:


http://www.shell.ca/home/content/can.../shell_vpower/

Fuel doesnt touch the valves in direct injection cars.

[Joshboody]

i don't think fuel economy will be effected. Power versus air / fuel will stay the same... you'll just be limited in max power.

[bulldog_yyc]

ahh makes sense - not looking forward to dealing with this

[mycoupe]

Why must we constantly educate people that these motors are DI????

[Transport3r]

Really? How many times do we need to explain DI?
We need a sticky about how DI works.

[Rotorocious]

Fwiw I'm getting 1.5 more mpg even
With my repeated test runs to 120

[original86]

Originally Posted by dzenno

Nothing really damaging, only loss of power..

You dont believe all this buildup on the valves/intake can affect the injectors?
As soon as they descend any loose sediment/vapor will enter the combustion chamber.

First go around on my injector replacement a few months ago that was the stated cause of my injector failure.
The BMW SB I was given also listed "carbon deposit formation" on injector tips.

A few months later they replaced the injectors again... (same revision, which is the latest recall part #)

I know some diesel engines suffer from injector failure due to carbon deposits, and im pretty sure that's what the N54 community has been seeing for quite some time.

I`m pressing for the dealer to clean my valves, sorting out my OCC system, running meth, and am expecting to never have an injector fail, or at least not in 5-10k mile consistency in which it has to date...

PS : Audi/VW have admitted the deposits cause their cold start and running misfires.
The buildup plays a HUGE role on air turbulence, and from what I have read some DI systems are more affected than others.
"Otto" injectors being the most impeded by the buildup... stratification and the such all playing a role.

[**335i**]

is this cos of meth?

[original86]

Originally Posted by **335i**

is this cos of meth?

your post?

[///M3THOD]

Originally Posted by turkish335

does type of fuel play a role? For example, Shell v-power has nitrogen and other detergents that claim to keep valves clean:


http://www.shell.ca/home/content/can.../shell_vpower/

The issue here is blowby, after all these threads I have seen in the past couple of weeks I am going to clean my valves and invest in an oil catch can.


Its absurd how expensive these stupid things are. I'm thinking I might just fab a mounting point and go with a generic can. At BMS the can is 370 dollars for a f--king can with two fittings and a hose.. whut?

[rgpwr]

Originally Posted by **335i**

is this cos of meth?

Originally Posted by original86

your post?

[bulldog_yyc]

Originally Posted by ///M3THOD

The issue here is blowby, after all these threads I have seen in the past couple of weeks I am going to clean my valves and invest in an oil catch can.


Its absurd how expensive these stupid things are. I'm thinking I might just fab a mounting point and go with a generic can. At BMS the can is 370 dollars for a f--king can with two fittings and a hose.. whut?

compared to some other platforms, I think the BMW tax is in full effect for catch cans for our cars

[Clap135]

Originally Posted by ///M3THOD

The issue here is blowby, after all these threads I have seen in the past couple of weeks I am going to clean my valves and invest in an oil catch can.


Its absurd how expensive these stupid things are. I'm thinking I might just fab a mounting point and go with a generic can. At BMS the can is 370 dollars for a f--king can with two fittings and a hose.. whut?

Welcome to the BMW aftermarket Rapefest. The more idiots that buy these expensive parts, the worse it gets.

[momstmg78]

M3thod, i'm covering the hospital in Montgomery for emergencies this weekend. If you need help cleaning your valves let know. I'll bring some tools with me if so.