MC head self-machining, cam+cap

[auditude at cox.net]

Hi Huw,

When I was at the machine shop, the guy there pulled that cap off and test fit it the other way.  It looks like the interference would be worse.

I also noticed for the first time how caps 2 and 3 cannot be swapped with each other.  I am always mindful of not swapping caps or orientations, so I never noticed the opposing offset studs for the two.  That's cool, the only thing that can be done wrong is putting them on right bearing backwards.

The lobes on the cam did seem at the time like they could be a tad to the rear, barely noticable and possibly my imagination.

While I don't have a turbo cam to use instead of this one, I can bring a normally aspirated cam and either compare it to the one in the head, or actually put it in.

Does anyone have an MC-2 cam they are not using that I could beg, borrow, or buy?

Thanks,

Ken

Huw Powell <audi at humanspeakers.com> wrote:
>
> > As the head is sitting on the counter, I noticed that the cam lobe in
> > front of the second bearing cap is basically in contact with the side
> > of the cap.  The lobe actually has scraped off metal from the cap
> > where it interefered!
> >
> > It's as if the lobe is too far back, or perhaps the whole cam is too
> > far to the rear.
>
> Or perhaps the cam bearing cap thing got put on backwards?  Is the cam
> lobe centered over the valve lifter like the others?
>
> Not sure I'd want to put a "mystery set up" like that on a high
> performance engine unless I knew *exactly* what had been done (and why?).
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/