[Fot] TR3/4 cam help

[Duncan Charlton]

I've obtained cam specs with a dial indicator and a degree wheel, 
entering the data into Excel.  It's time consuming but not that 
difficult when the camshaft is in the engine or chucked in a lathe -- 
after seeing Larry Young's garage setup I realized I could do this 
manually.  I haven't gotten around to calculating valve train 
acceleration yet but I was able to plot the curves of an unknown DeLong 
grind in a Ford 1500 engine and determine how much valve lash to use, 
which was the goal at the time.  Larry's writings on the Tilden 
Technologies website are highly useful.

However, these measurements did not tell me "which" DeLong cam I had, 
ie: its part number, so knowing "which cam" I had (and perhaps therefore 
whether it was judged by the manufacturer to be better or worse than 
some other grind) was not going to happen (not to mention that DeLong is 
long out of business).  But plotting the curve against a Crane cam with 
a name that put it in the same ballpark ("300 degree" or somesuch) I 
could see where the differences were -- the Crane cam had greater lift, 
but the DeLong cam, with less total lift, had more acceleration, opening 
the valve to a greater degree early on in the curve, so the area under 
the curve could be close or perhaps even better.

Duncan


On 1/26/15 7:35 AM, EDWARD BARNARD via Fot wrote:
> I would think that someone with a Cam Doctor (Larry Young) could run 
> them and retrieve the specs for a nominal fee. I bought a Cam Doctor a 
> few years back but didn't have a computer to dedicate to run it on; it 
> needed MSDOS. I resold it on Ebay and recovered my cost.
> -Ed-
>
>
> On Monday, January 26, 2015 6:54 AM, Bob Kramer via Fot 
> <fot at autox.team.net> wrote:
>
>
> I got some Cams with the #67 car t hat were brand new but unknown 
> grinds. They were custom grinds and came in Crane Cam boxes/ I sent 
> them to Crane to run the specs for me; they charges $60.00 each to do 
> that. They could find no record of the cams in their extensive files. 
> I don't know what to do with them now that I did that (:
> Bob Kramer
> rkramer3 at austin.rr.com <mailto:rkramer3 at austin.rr.com>
>
> ---- Greg And Alison Blake via Fot <fot at autox.team.net 
> <mailto:fot at autox.team.net>> wrote:
> > I came across a cam with some crazy looking profiles on it today in 
> a box of spares that came with a TR4a dad and I purchased. It has the 
> following stamped on it:
> > C-2781
> > C285-2
> > C290-2x6
> >
> > Anyone know what this might be?  Profile on the lobes looks 
> interesting but it also looks like the grinder took a lot of metal out 
> of the cam to create this grind. It is a very small diameter shaft now.
> >
> > Also in the spares was a Kastner F cam. Anyone run one of these that 
> can send me the characteristics?  The nose on the lobes of the F look 
> really broad and rounded.
> >
> > Thanks,
> >
> > Greg
> >
> > _______________________________________________
> > fot at autox.team.net <mailto:fot at autox.team.net>
> >
> > http://www.fot-racing.com/
> >
> > Donate: http://www.team.net/donate.html
> > Archive: http://www.team.net/archive
> > Forums: http://www.team.net/forums
> > Unsubscribe/Manage: 
> http://autox.team.net/mailman/options/fot/rkramer3@austin.rr.com
>
> >
> >
>
> _______________________________________________
> fot at autox.team.net <mailto:fot at autox.team.net>
>
> http://www.fot-racing.com/
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: 
> http://autox.team.net/mailman/options/fot/edwardbarnard@prodigy.net
>
>
>
>
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20150126/5bbf147f/attachment-0001.htm>