[Flex68]

So a occ will prevent carbon build
Up I'm told is this correct ?

[vtl]

Originally Posted by Flex68

So a occ will prevent carbon build
Up I'm told is this correct ?

An oil catch can doesn't prevent carbon build up despite what the vendors might suggest. You will still need to clean the valves.

[titium]

Originally Posted by vtl

An oil catch can doesn't prevent carbon build up despite what the vendors might suggest. You will still need to clean the valves.

vtl correct me if I'm wrong here. but this is what i have been able to gather regarding catch cans on the n54.

basically the current catch can setups on the market don't filter the crankcase vapours going directly into the intake valves they will help a little though but alot of this blowby ends up coating the fmic and charge pipe. these catch cans only work under high boost where the crankcase vapours are drawn out by the rear turbo compressor and the pcv valve is shut blocking vapours from going straight onto the intake.

under low load the pvc vents above cylinders 4,5,6 hence the back 3 cyl always being more dirty.

It looks like the rb external pcv mod with and oil catch can should help significantly with carbon on the intake valves as it filters the pcv gases going directly into the intake I guess only time will tell.

[Flex68]

Originally Posted by vtl

An oil catch can doesn't prevent carbon build up despite what the vendors might suggest. You will still need to clean the valves.

So bms claims are porkys then? LOL

[titium]

Originally Posted by Flex68

So bms claims are porkys then? LOL

nope not porkys but the don't address the entire problem only part of it.

[Flex68]

Originally Posted by titium

nope not porkys but the don't address the entire problem only part of it.

Ok cool cool well I'm very surprised that there's isn't a complete preventative mod for the shitty crust build up

[vtl]

Originally Posted by titium

vtl correct me if I'm wrong here. but this is what i have been able to gather regarding catch cans on the n54.

basically the current catch can setups on the market don't filter the crankcase vapours going directly into the intake valves they will help a little though but alot of this blowby ends up coating the fmic and charge pipe. these catch cans only work under high boost where the crankcase vapours are drawn out by the rear turbo compressor and the pcv valve is shut blocking vapours from going straight onto the intake.

under low load the pvc vents above cylinders 4,5,6 hence the back 3 cyl always being more dirty.

It looks like the rb external pcv mod with and oil catch can should help significantly with carbon on the intake valves as it filters the pcv gases going directly into the intake I guess only time will tell.

Under low load the PCV does not vent above cylinders 4/5/6. The vent is actually located on the throttle body behind the butterfly. This would mean the vapours will reach all the valves. While I have noticed uneven carbon build up on most of the cars I have blasted, I would not say any cylinder or bank was more prone to carbon build up than others.

Yes the normal catch can setups will only catch vapours under boost. For daily drivers who do occasional squirts of power this is pretty useless. Maybe if you wanted to catch the vapours to avoid the lowered octane of oily air, but most people aren't trying to extract the last 2kw of performance.

Will be interesting to see if the external PCV mod/catch can setup will actually eliminate carbon buildup. I am skeptical, all I know is that I am yet to see a direct injected platform solve carbon buildup with catch cans.

In my opinion, a catch can isn't that useful for the regular person unless it is able to catch most of the oil vapours, and prolonging the need for walnut blasting to some ridiculously long interval (> 150,000). Otherwise you just have another widget cluttering up an already tight engine bay that really doesn't do that much.

[Flex68]

Originally Posted by vtl

Under low load the PCV does not vent above cylinders 4/5/6. The vent is actually located on the throttle body behind the butterfly. This would mean the vapours will reach all the valves. While I have noticed uneven carbon build up on most of the cars I have blasted, I would not say any cylinder or bank was more prone to carbon build up than others.

Yes the normal catch can setups will only catch vapours under boost. For daily drivers who do occasional squirts of power this is pretty useless. Maybe if you wanted to catch the vapours to avoid the lowered octane of oily air, but most people aren't trying to extract the last 2kw of performance.

Will be interesting to see if the external PCV mod/catch can setup will actually eliminate carbon buildup. I am skeptical, all I know is that I am yet to see a direct injected platform solve carbon buildup with catch cans.

In my opinion, a catch can isn't that useful for the regular person unless it is able to catch most of the oil vapours, and prolonging the need for walnut blasting to some ridiculously long interval (> 150,000). Otherwise you just have another widget cluttering up an already tight engine bay that really doesn't do that much.

Great info and great to
Know I didn't fork out $300 aud for a bms catch can

[titium]

Originally Posted by Flex68

Great info and great to
Know I didn't fork out $300 aud for a bms catch can

+1 I'm still undecided whether I'll bother with any of the catch can setups or messing with the pcv system. seems as if it'll cost more in the long run by the time you buy all the parts plus the headache of install.

just had a walnut blast and if i get another done for $500 at a shop in 80k km time that's 160k km of milage probably longer then I'll own the car.

[Flex68]

I seen the bav auto walnut tool kit roughly $500 landed are they any good ?

[vtl]

Originally Posted by Flex68

I seen the bav auto walnut tool kit roughly $500 landed are they any good ?

Too expensive for what you get. You only get a tank, wand and some shells. Can buy the stuff locally and get the same for under $200

I'd recommend the following if you only intend on doing your own car:

- eBay soda blaster for around $130 - http://www.ebay.com.au/itm/GIANTZ-40...Z6aciki7aNBf7w
- BMW N54/N55 adapter tool p/n 81292208037 (got mine from ecs on a bigger order to save on shipping)
- bunnings shop vac $65 - http://www.bunnings.com.au/ozito-125...acuum_p6290516
- bunnings compressor hire - http://www.bunnings.com.au/for-hire-...-rate_p5470037
- air duster $7
- blasting wand with some air fittings and adapters (DIY from an duster) $20

[Flex68]

Originally Posted by vtl

Too expensive for what you get. You only get a tank, wand and some shells. Can buy the stuff locally and get the same for under $200

I'd recommend the following if you only intend on doing your own car:

- eBay soda blaster for around $130 - http://www.ebay.com.au/itm/GIANTZ-40...Z6aciki7aNBf7w
- BMW N54/N55 adapter tool p/n 81292208037 (got mine from ecs on a bigger order to save on shipping)
- bunnings shop vac $65 - http://www.bunnings.com.au/ozito-125...acuum_p6290516
- bunnings compressor hire - http://www.bunnings.com.au/for-hire-...-rate_p5470037
- air duster $7
- blasting wand with some air fittings and adapters (DIY from an duster) $20

You deserve something ... I dunno what but you deserve something for your input lol

[vtl]

Did ash5584 's car today. Sitting on around 100k. Looked like a fair amount of buildup but cleaned off very easily with no hard chunks embedded. Apparently this car has some sort of intake chemical cleaning. You can see from the precleaning pictures it was completely ineffective.

[b1mmr]

That's just ugly.. I have 112k

Why you gotta be in au m8 come to us and help me out lol

[EB89]

Originally Posted by Ian_N54

That's just ugly.. I have 112k

Why you gotta be in au m8 come to us and help me out lol

I'm sure you can find a shop to do this for you.

[b1mmr]

Originally Posted by EB89

I'm sure you can find a shop to do this for you.

I'd probably do it myself eventually.. But what kind of shop would I even ask?

[Flex68]

Originally Posted by vtl

Glad to hear it! Went pretty smoothly, had it all done in 2.5 hours, my quickest yet. Time varies from car to car, its usually fastest when dealing with a stock car as they will never have fitment issues with after market parts

Map sensor oring was basically welded to the charge pipe. Lucky I keep a few map sensor orings spare!

Hey mate where did you get the map sensor o ring ?? I thought Bmw don't seek them separately ?

[vtl]

Originally Posted by Flex68

Hey mate where did you get the map sensor o ring ?? I thought Bmw don't seek them separately ?

Its a 10x2mm oring, got it from here:

http://www.ebay.com.au/itm/280345574...%3AMEBIDX%3AIT

Even if the original oring isn't chipped, it may be a little tired and not seal as tightly.

[Flex68]

Originally Posted by vtl

An oil catch can doesn't prevent carbon build up despite what the vendors might suggest. You will still need to clean the valves.

Thanks for that mate .... I have decided that I'm going to follow your build
Of the walnut blaster and make my own kit since no one in Sa does it ffs

[vtl]

Its been 20,000kms since my walnut blast last year. Decided to do another walnut blast and see how much build up accumulates.

Was surprised at the amount of buildup actually. Was actually quite signifcant and required quite a bit of scraping to remove. Was fairly thick on cylinder 2,5 and 6.

[Fuji]

20k km only?? How many years is that?

Edit: oops it says last year haha

[EB89]

Far out! That's dirty for 20k!!

Seems like walnut blasts should be a yearly thing.

Have you done any N55? I'm due for a service and may ask for this to be done, I just hit 100k