[Supras] N/A cams: snake oil?

[Jeff Mohler]

If anyone has a _certified_ set of N/A cams, I have a Cam Doctor that
I can profile them with that I use for tech inspections at the track.

On 10/18/06, Joel Watkinson <Cars at xantheon.com> wrote:
> My only question would be:
>
> How can you *confirm* (beyond a doubt) that these are indeed NA cams? I
> mean, if people can part out a Turbo and sell the cams to other Turbo
> owners for more than they can sell their stock cams when legitimately
> advertised, some people will just go for the cash regardless of what it
> may mean morally...
>
> I am *not* trying to slam the Supra community. I have gotten *great*
> deals from it! I've followed the NA vs Turbo cams with interest for a
> long time. I still have my '87T and a JDM motor that has already been
> rebuilt and tested and have yet to put it all together along with a set
> of "NA" cams I also bought from eBay. So, I have a few reasons for my
> questions:
>
> First, for the validity of the information for the community.
>
> Second, to see if there is any reason I should install the cams I
> bought.
>
> Thirdly, to see if there is some way I can confirm that what I bought
> are indeed NA cams (should it be worth installing them per the first two
> points)
>
> Hope this all helps a lot more people than myself...
>
>
> > -----Original Message-----
> > From: supras-bounces at supras.com
> > [mailto:supras-bounces at supras.com] On Behalf Of
> > berniek at technicaldevelop.com
> > Sent: Wednesday, October 18, 2006 12:46 AM
> > To: Supras at supras.com
> > Subject: [Supras] N/A cams: snake oil?
> >
> > Hi list:
> >
> >     Bought a pair of N/A cams on ebay.  All of the lobes are
> > uniformly about .009" to .010" less in height than the turbo
> > cams.  Also, there is only a minimal groove where the front
> > seal lip wears on the front diameter.  So these cams
> > apparently have not seen much use, and apparently are N/A cams.
> >
> >     I set up each in the lathe with a flat follower attached
> > to a 1" travel dial indicator, and a degree wheel at the
> > tailstock end, held between the front end screw hole and a
> > live center in the tailstock.  A pointer was made out of
> > wire.  I tested both the intake and exhaust cam and could not
> > find any timing differences between the turbo and N/A cams,
> > except for maximum lift, a little less with the N/A cams.
> >
> >     In the data below, the exhaust comparison is shown.  The
> > intake comparison is just about the same.  In neither case
> > did I find a 10 degree difference in duration.  I set the
> > degree wheel to read zero at .050 lift on the closing side.
> > Because the degree wheel was hard to set precisely the
> > estimated error is plus or minus .003" to .005" in lift.
> > However, a 10 degree difference in duration would have shown
> > up.  I can list the intake data as well, but it is just about
> > the same is exhaust data in each case.  Bear in mind that
> > angles shown are camshaft, not crankshaft degrees.
> >
> > Exhaust: open to close, .from top to bottom in table, 050"
> > lift set to 0 degrees closing.
> >
> > Turbo Lift        Turbo angle    N/A lift    N/A angle
> >
> > .000                -130               .000        -130
> > .008                -120               .010        -130
> > .017                -110                .013        -110
> > .048                -100                .056        -100
> > .120                -90                  .122        -90
> > .193                -80                  .197        -80
> > .250               -70                  .250        -70
> > .284                -60                  .279       -60
> > .296                -50                  .288        -50
> > .285                -40                  .278        -40
> > .249                -30                  .247        -30
> > .192                -20                  .190        -20
> > .120                -10                  .119       -10
> > .050                   0                  .050         0
> > .016                +10                 .015        +10
> > .009                +20                 .012        +20
> > .001                +30                 .003        +30
> >
> > Any information from anyone who has researched this subject
> > would be appreciated.
> >
> > Thanks.
> >
> >         BernieK
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> >
> >
>
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