MultiAIR II quali differenze col MultiAIR I ?

[Umbi]

MultiAIR II quali differenze col MultiAIR I ?

[MacGeek]

MultiAir 2 ha il profilo delle camme d'aspirazione con un'estensione asimmetrica sul lato di apertura, che abbinato a una specifica logica di controllo consente di gestire meglio l'EGR interno.

[max_pershin]

Intake camshaft? You might mean virtual intake camshaft

As I know in US Multiair 2 has been used since 2012, so my car has it.

The main difference, I think, from the driver's point of view, is a lack of engine brake. When you try to brake by the engine the reaction is similar to the gearbox in Neutral.

 

 

☏ Z957 ☏

 

 

 

 

[Umbi]

I have seen the acronym Multiair II appear for the first time on the new COMPASS model .... not before

[MacGeek]

No, I do not mean virtual. The intake cam lobes are very much real. As for engine braking, the ECU will close the throttle body in cut-off scenarios.

 

MultiAir 2 has been used on the 2.4L Tigershark on several models, and it's being used on the 2.0L GME on the Giulia and Stelvio.

[max_pershin]

Multiair engines have exhaust camshaft only, SOHC, which used also as a pump for Multiair oil system.

Intake valves are controlled by electro-hydraulic system, there is no intake camshaft.

 

1.4 Turbo Multiair 2 also exist, as I was told by Magneti Marelli Elaborazione technitian to use Multiair 2 set up for programming of tuning box.

This setup has been presented since 2012.

 

☏ Z957 ☏

 

 

 

 

 

 

[MacGeek]

I never said intake camshaft. I said intake cam lobes. Which are on the same camshaft as the exhaust cam lobes. It's not just a pump, they are proper Intake cam lobes, which define the maximum timing and lift for the valves. In "full lift" mode, the valves follow exactly the intake cam lobe profile, as if the MultiAir system wasn't even there.

 

P.S. there are DOHC MultiAir engines as well. Just not from FCA.

Modificato 7 Gennaio 2018 da MacGeek

[max_pershin]

Thank you for the clarification MacGeek!

On what engines DOHC Multiar has been used, never heard about them?

[Bare]

JLR Ingenium...

[max_pershin]

11 minuti fa, Bare dice:

JLR Ingenium...

 

Seems it is an Uniar system, one of the first versions of hydro systems that fiat tested in early 00s, almost 20 years behind of current Multiair 2

Modificato 7 Gennaio 2018 da max_pershin