stock MC cam differences?

[auditude at cox.net]

Hi Eric,

Okay, that probably does help.  If this is an early MC-1/'86 5kt, then maybe it has the same cam or style cam as the KH.

You could be asserting that an '86 MC has the relieved lobes (or you could be basing that on what I expected to see), but since I don't think you are, I'll take it only as information regarding how a KH turbo cam looks.

Unless the lobe relief is a non-turbo cam thing.  Could the non-relieved lobe be used to transfer more heat out of the lifter/valve?  Just out of curiousity, I doubt it matters much.

Thanks!

Ken

Eric <eric-audi.ql at mindspring.com> wrote:
>
> I can't answer most of your questions but I do know that my 85 KH turbo
> motor does not have the relieved lobes like an 86 MC does.
>
> -Eric
>
> 4kq (started pulling the motor Sunday to insert quantity 1 KH motor)
>
> auditude at cox.net wrote:
>
> >Hello again list,
> >
> >Another lister has sent me his old MC cam, from an '86 5kcstq, so that I can use it instead of the funky cam I have that seems to have a lobe too close to the cam cap and had machined into the side of it.
> >
> >I got the cam, but it is different from the funky one currently in the head.  One, the back of the lobes are not "relieved" (to reduce friction and/or rotate the lifters in the bores).  Second, the eccentric lobe that would run a vacuum pump on a normally aspirated car has wear on it that would indicate it was driving such a pump.
> >
> >The lister said as far as he knows it is the right cam for the car it came out of.
> >
> >Does this seem like the right cam?  Is there a way to check part numbers or something to verify?
> >
> >There is an oil squirter that looks like it would squirt directly at the middle of the eccentric lobe, so it is possible that the detergents in the oil would make a clean area that would look similar to that lobe driving a vacuum pump.
> >
> >I'll probably end up using the cam regardless, but I would like to confirm that it is the correct one for a turbo, at least.
> >
> >Is the relieved cam lobe thing only for turbo motors, or maybe it is only for later models?  Is there anything besides a vacuum pump that would wear the eccentric lobe?
> >
> >Thanks,
> >
> >Ken