[Shotimes] Re: Cam timing info needed

[Leigh Smith]

Thanks Mark;
Joshs site leads me to belive the MTX cams have 203 degree lobe centers
(crankshaft degrees) which would lead to 101.5 degree lobe centerlines on
both I & E if they are indeed factory installed straight up. But maybe they
were, and maybe they weren't.
I guess Ian & I will measure one to know for sure.
Then on the ATX cams, there seems to be a an extra 4 degrees (crank) , but
is the E advanced or the I retarded? Again I've heard 2 stories. I would
tend to think the E advanced to help the torque. Make sense?
Lee

----- Original Message ----- 
From: "Mark Nunnally" <marknunnally@JoiMail.com>
To: "Leigh Smith" <leighsm@comcast.net>; "SHOTIMES"
<shotimes@autox.team.net>
Sent: Sunday, October 02, 2005 7:46 PM
Subject: Re: [Shotimes] Re: Cam timing info needed


> > I found max lift & duration on Josh's site.
> > But I need the centerlines for I and E.
> > Anyone know these?
> > Can't check the cams without it.
>
> The real world measured lift is higher than the published specs (at least
> for the 3.0L intake) as we ran into this discussion in using these for a
> NASA USTCC race and what would happen if a post race teardown was
completed
> (ie, the cams would measure higher than the shop manual).  They are just
> "hotter" for whatever reason than published (don't you think the techs
would
> smile on that :)  Moot, since I think later Dan B. got approved for the
SHO
> to run +40 cams with other mods on a 3.2L since he was 2 secs lap slower
> than a competitive car.  I digress...
>
> I don't remember if anybody came up with an accurate centerline , but the
> OEM ATX intake (vs MTX intake) are retarded by 2 degrees (not on the
> bolt/dowel hole, but the cam grind itself).  Only to note that since this
> would affect if you are working with +20 (ATX core base) or +40 (MTX core
> base).
>
> mark
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