[Fot] Mystery cam

[McKearn McKearn]

HI.
  Never mind the degree wheel, check out that granite workbench top.  Now
that's a workshop!
                                   P.J.

On Fri, Jun 17, 2016 at 5:20 PM, Bill Babcock <ponobill at gmail.com> wrote:

> Yeah, I couldn’t figure out your spreadsheet. My degree wheel helps
> usually since it’s a 180 wheel:
>
> On Jun 17, 2016, at 12:39 PM, Larry Young <cartravel at pobox.com> wrote:
>
> Bill, I believe you had a 298D cam that was in an engine from uncle jack,
> but you told me you were not going to run it.  That was a few years ago.
> Someone on the list will probably want it if you don't.  I'll send you the
> cam card.  It should be run with 0 to 4 degrees advance and a valve lash of
> 0.015.
>
> Steve Long sent me the specs of all the Erson cams, so the numbers on my
> website should be accurate.  Steve will grind whatever lobe separation you
> want, so you can't use lobe separation to identify his cams. The Erson 23
> should have similar lift, but a lot more duration than my 298D cam.
>
> Cam timing is confusing because the scales on the degree wheels run one
> way then another. I often subtract when I should add, because of the scale
> direction.  I'd prefer a scale that runs from 0 to 360.  I have a couple of
> Excel spreadsheets you can download from my website that might help with
> some of this.  The one for timing is confusing because of the conversions
> of all the degree wheel readings.
>
> Larry
>
> www.TildenTechnologies.com <http://www.tildentechnologies.com>
>
>
> On 6/14/2016 12:46 PM, Bill Babcock wrote:
>
> Searching around on the web, it kind of looks like a TilTech 298Dx, but I
> don’t recall buying a cam from Larry and Tony Garmey doesn’t think so
> either. I could just set it up as if it were, but it would be good to know.
>
>
> On Jun 14, 2016, at 10:40 AM, Bill Babcock <ponobill at gmail.com> wrote:
>
> Oh, and the lift is .372
>
>
> On Jun 14, 2016, at 10:11 AM, Bill Babcock <ponobill at gmail.com> wrote:
>
> I’m building a new motor for Peyote from the bits of it’s previous engine.
> I discovered the front main bearing cap was cracked in half when I decided
> to freshen the motor. I’ll work on replacing the cap later—maybe get a
> billet one made, but in the meantime I’ve run into a minor problem. I don’t
> know for sure what cam I have or how it should be set.  Tony Garmey says
> it’s a BFE cam, but I can’t find any specs for those and can’t get ahold of
> Ken.
>
> I ballparked where I think the cam might want to be and got this for
> measurements:
>
> Reading the Intake and exhaust valve movement from the spring retainers I
> use 0.033” as the open/close height which is .050/1.45 which as I recall is
> the ratio of the stock rockers”
> Intake open .033 @ 36 BTC
> Intaake close .033” @ 76 ABC
> Exhaust open .033” @ 76 ABC
> Exhaust close .033” @ 42 ATC
>
> By my calculations that gives:
> Intake duration 292.0 degrees
> Exhaust duration 298 degrees
> Intake lobe center 110.0 ATC
> Exhaust lobe center 107 BTC
> Overlap 78
> Lobe separation angle 108.5
>
> Pretty sure this isn’t exactly where it needs to be. I have a vernier
> sprocket so I can adjust the timing precisely. My questions are:
>
> What cam is this?
> Where should it be set?
> How much advance?
>
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> <TR298Dx_install.pdf>_______________________________________________
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