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Old 12-20-2016, 04:47 PM
lo_jack lo_jack is offline
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Quote:
Originally Posted by 80stech View Post
@lo-jack
It's best to inform yourself about how things work and know how you want to change them, not to try to copy. It might be the same engineers that designed the M54 CCCV ! What I am really curious about is why the crankcase needs to be completely closed in the first place? emmisions maybe ? to meet what spec? what is the reasoning ?

That's the point: every motor is developed with different emissions pressures from regulatory, but also cost directives from project development. The M56 SULEV aluminum intake with built-in CCV was way more expensive to design and manufacture than the plastic tube octopus calamity M54 got. There has to have been a reason they did not put M56 SULEV intake into service before. Perhaps it was only cost. The tube monster isn't reliable, so it wasn't that either. I believe most of these choices are based on cost.

But there was incentive to get SULEV certification later, so that warranted the extra cost of designing and casting that intake manifold. Also recall there were fires caused by the worthless CCV in M54, and that lead to an unsuccessful class action wherein BMW denied responsibility but updated the parts and issued TSBs.

Copying another OEM system is about using OEM parts that have been put into service by the factory for factory spec, which you know has at least had a minimum of thought put around reliability and liability. Minimum, obviously, as M54 CCV was a catastrophe.
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