[John@BPC]

Hey guys,

Dan and I put together a short video clip highlighting some of the N52's features, and inner workings that we've all been talking about lately. We started this thread to help give back some answers to the community about what makes this N52 cylinder head special.

Thank you!
John
BPC

Remember, Click 1080p HD!

[E91 M Sport]

Thank you for this! Coming from a car that wasn't equipped with valvetronic or VANOS this has shed the light on how different this engine functions compared to traditional valve train/throttle body systems.

Knowing that this engine can run without a traditional throttle body why is this car equipped with one to begin with? Is it just for cold starts/warm up?

Also do you think it would be possible to design a revised eccentric cam and accompanying intermediate levers that would give more lift/duration while keeping the OEM cams in place?

[hassmaschine]

it's to develop partial vacuum under light load, and also as a failsafe incase of valvetronic failure.

Looking forward to watching this video later - it really is a clever system, and really isn't all that complicated, although there is a lot of moving parts (two rockers, two cams, springs, motor, sensor).

[Ruddigger]

Wow, that was a GREAT video!

[E91 M Sport]

Originally Posted by hassmaschine

it's to develop partial vacuum under light load, and also as a failsafe incase of valvetronic failure.

Interesting. So would a valvetronic failure result in "full lift" and the throttle body takes over air delivery, or does it go into limp mode?

Looking forward to watching this video later - it really is a clever system, and really isn't all that complicated, although there is a lot of moving parts (two rockers, two cams, springs, motor, sensor).

If you count the eccentric cam there's 3. Trick stuff

[hassmaschine]

it goes to full lift and uses the throttle. it *is* a limp mode, as it's not the intended way for the engine to control load, but it would drive mostly fine.

yeah, I was excluding the exhaust side since that's just standard OHC stuff.

[tetsuo111]

Thanks, Dan.

I'm a fan of your process, obtaining flow data to benchmark the unit before tweaking. A real engineer's approach.

1:55 "this gives us options to look into regrinding the original cams"

You have my attention....

[E91 M Sport]

Originally Posted by hassmaschine

it goes to full lift and uses the throttle. it *is* a limp mode, as it's not the intended way for the engine to control load, but it would drive mostly fine.

yeah, I was excluding the exhaust side since that's just standard OHC stuff.

Thanks for clarifying. I associate limp mode as in severely limited output but I see what you're saying.

[Three_thirty_I]

Very cool video!! Thanks!! It helps show and explain how everything works, and pretty much how I thought, but pretty cool to see the inner working in action! And actually gives me a renewed "respect" for the design, as crazy as it is. Look forward to your future videos!

[justpete]

Y'all.F'in.Rock.

[bimmerquick43321]

Really cool, thanks.

[Tom Droze]

My BMW just fell in love and neither one of us does very well in a long distance relationship; as such, does anyone know a good residential realtor in or around Raleigh, North Carolina?

[JuniorB]

Dan,you guys keep that shop looking spotless!Being a diesel tech,I'll never see a shop like that,but that's a whole other level,looks great! Now I see how difficult it is to max these heads out ,or even to repair them. Thanks for the vid,it helps when it's understood while watching.

[Taskmaster]

Modifying the the eccentric gear/motor would probably be easier than grinding a whole new cam, but how about the ECU, does it allow you to plug in higher values?

[Punisher3.0si]

Originally Posted by E91 M Sport

Thank you for this! Coming from a car that wasn't equipped with variable cams or VANOS this has shed the light on how different this engine functions compared to traditional valve train/throttle body systems.

Knowing that this engine can run without a traditional throttle body why is this car equipped with one to begin with? Is it just for cold starts/warm up?

Also do you think it would be possible to design a revised eccentric cam and accompanying intermediate levers that would give more lift/duration while keeping the OEM cams in place?

The evap system and brake booster need vacuum to work. There needs to be a pressure delta for a vacuum to form in the intake. There would be only atmospheric pressure in the intake without a TB.

[tdavis42]

In case you didn't read the other comments that everyone has left I just want to say this is such a great contribution. BPC is going to take this car to the next level with turbos and I am excited to see what people do with you guy.

[Stream]

Originally Posted by John@BPC

Hey guys,

Dan and I put together a short video clip highlighting some of the N52's features, and inner workings that we've all been talking about lately. We started this thread to help give back some answers to the community about what makes this N52 cylinder head special.

Thank you!
John
BPC

Remember, Click 1080p HD!

Would you be so kind to add subtitles to your video?
I'd like to translate it for russian community.

[Kirkies328]

Originally Posted by John@BPC

Hey guys,

Dan and I put together a short video clip highlighting some of the N52's features, and inner workings that we've all been talking about lately. We started this thread to help give back some answers to the community about what makes this N52 cylinder head special.

Thank you!
John
BPC

Remember, Click 1080p HD!

If you guys need a guinee pig car for testing out that turbo kit i would be willing to drive it out there from ca haha

[Punisher3.0si]

Originally Posted by Stream

Would you be so kind to add subtitles to your video?
I'd like to translate it for russian community.

My phone automatically does it. It has a lot of errors though. Just check out options in youtube.

[F22_Raptor]

Great video, especially for people (like me) who arent quite sure how VANOS and Valvetronic work.

[ZeroSum]

Great video

[John@BPC]

Originally Posted by Punisher3.0si

The evap system and brake booster need vacuum to work. There needs to be a pressure delta for a vacuum to form in the intake. There would be only atmospheric pressure in the intake without a TB.

Actually, This motor has a vacuum pump to handle the evap and brake booster functions you're talking about. Its mounted where the high pressure fuel pump would be on the N54.