RNS-11Z

Is it true 507 c63s run a different cam spec compared to the first c63's produced (08/09 models)?

Thanks

Merc63

Nope

RNS-11Z

How do you know?

Merc63

It's the same engine in every c63.

They can vary the cams via the ECU to change the specs.

RNS-11Z

Interesting. My tech said from 2010 part numbers changed. So I assumed cams changed too. I could be wrong hence why I started this thread. Thank you for the info though

odonnks

I can't answer you question about cam specs but regarding part numbers, I often see them change while the actual component does not. At least the change is not percieved to our eyes.
Sometimes a PN change just means its coming from a different supplier.

Merc63

Ya could be a material change, remember that law suit with the cams?

ToXicXxX

Only big thing that I noticed changed were the valve covers went from grey metal to black plastic. Oddly.

Merc63

Black means updated head bolt

Bazman

like Vitec?

Cool! That'd mean you can change intake and exhaust Lobe centres at different rpm points. Know any tuners that can access and rephaze those?

Merc63

I think only a couple top tuners can vary the cams.

Vtec can increase lift too. These don't, they can retard and advance each cam 20 degrees or so. Since its a dual cam head, the ECU can change the intake and exhaust relation as well.

I think the factory already has many many hours into the cams and has them running peak.

The cam variation is why the car idles perfectly but screams to redline with a nice broad torque curve.