Quote:
Originally Posted by peterux
In particular I am baffled by this bit hanging off the inlet manifold...
cheers
Peter |
I've invested in a BMW e46 Bently manual. It cost a a packet but it is huge; running to 1400 pages and a full 50cm thick!!
So now I know what the mystery object is above....
It's a valve that changes the resonace affect of the dual runner manifold. The design enhances low end torque by changing the intake air flow configuration for varying engine speeds.
At low speed the valve is shut which gives the intake air charge the dynamic effect of long intake tubes. This (apparantly) increases torque.
Above 4100rpm the valve opens providing the air volume for addtional power at higher rpm. (The manual has a lot more technical explanation if anyone is intrested
)
so now you all know..........