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Thread: N54 blow by

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    N54 blow by

    These engines seem to blow by quite a bit hence catch cans becoming a nessesity when tuning these engines. I always thought blow was caused by warn rings allowing pressure to escape. If this is correct and warn rings are the cause, are were loosing performance as well as harming the engine in the long run? Or am I being a noob?
    Trebilabackend/JB4 - VVT stage 1 - CP-e downpipes - wagner evo2 FMIC - ER charge pipe - Forge diverter valves - BMS DCI - n55 mids - evolve race exhaust - KWv3 - Quaife diff - huge 8 pots Click here to enlarge

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    Do a search on how the N54 PCV system works, it's a bit different from the standard concept.
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    I capture at least a quarter cup of oil in a red Solo party plastic cups on each oil change.

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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    Do a search on how the N54 PCV system works, it's a bit different from the standard concept.
    Will do. Reason why I'm concerned is that since going FBO with VVT stage 1 from stock oil seems to be gettin used a lot more when I had no issues with consumption before. No leaks and hardly any smoke from exhaust and coolant seems to be clear. Hasn't been re tuned since FBO so it might have something to do with the tune maybe.
    Trebilabackend/JB4 - VVT stage 1 - CP-e downpipes - wagner evo2 FMIC - ER charge pipe - Forge diverter valves - BMS DCI - n55 mids - evolve race exhaust - KWv3 - Quaife diff - huge 8 pots Click here to enlarge

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    What oil are you using?
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    Nothing special. My Indy just put bmw ll-04 oil in. Worth a change?
    Trebilabackend/JB4 - VVT stage 1 - CP-e downpipes - wagner evo2 FMIC - ER charge pipe - Forge diverter valves - BMS DCI - n55 mids - evolve race exhaust - KWv3 - Quaife diff - huge 8 pots Click here to enlarge

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    If I use any weight other than 0w40 with castrol synthetic (made in Germany) I seem to burn up oil a little quicker. It also can have a lot to do with how heavy footed you have been.
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    I know on more conventional setups like my g35 which guzzled oil, it seems like the more you engine brake to decelerate or downshift to slow down and pull vacuum the more oil gets consumed

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    Click here to enlarge Originally Posted by manbeer Click here to enlarge
    I know on more conventional setups like my g35 which guzzled oil, it seems like the more you engine brake to decelerate or downshift to slow down and pull vacuum the more oil gets consumed
    Very good point. I use this method quite alot or my brakes get eaten up. So more power, more vacuum more blow by?
    Trebilabackend/JB4 - VVT stage 1 - CP-e downpipes - wagner evo2 FMIC - ER charge pipe - Forge diverter valves - BMS DCI - n55 mids - evolve race exhaust - KWv3 - Quaife diff - huge 8 pots Click here to enlarge

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    Op if youre worried get the rob beck pcv valve and bms oil catch can. Ive had them on my car and they work well i have 65k on my car now did a walnut blasting at a local shop (flemming auto) and the valves werent bad just black. I dont burn oil either and i use the bmw oil and change very 5k or after a track weekend .
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    The root of the issue is how ineffective BMW's cyclonic chambers are. This is where the oil and oil vapors are suppose to be seperated, and the vapors sucked into the chamber via the ports on each cylinders intake ports and the oil drained back into the block. Problem is the system sucks and was only designed for stock like power.
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    The root of the issue is how ineffective BMW's cyclonic chambers are. This is where the oil and oil vapors are suppose to be seperated, and the vapors sucked into the chamber via the ports on each cylinders intake ports and the oil drained back into the block. Problem is the system sucks and was only designed for stock like power.
    What you have to do is block off the stock separators inside the valve cover, and put an AN bulkhead fitting into the front of the cover, then you can run ALL of the blow by though an external separator and into a "T" fitting where the blow by can either go through the flapper valve to the rear turbo intake tube under boost, or go through the valve cover and through the stock PCV valve and into the head ports under vacuum.
    Eppur si muove.

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    What you have to do is block off the stock separators inside the valve cover, and put an AN bulkhead fitting into the front of the cover, then you can run ALL of the blow by though an external separator and into a "T" fitting where the blow by can either go through the flapper valve to the rear turbo intake tube under boost, or go through the valve cover and through the stock PCV valve and into the head ports under vacuum.
    Agree, if i ever have to take my head off for any reason i plan on having those holes welded or plugged.
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