Re: Gaps and caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Near IR only on the solid state cameras... Not going to see warm things
(only really hot).. and, of course, the remote control is very close to red,
so it shows up just fine.

The non-contact temp sensors (like the "ear thermometers") work at much
longer wavelengths.  There is an implied calibration of the object's
emissivity, by the way, and they aren't all that precise (several degrees...
several percent... read the specs).  The ear thermometers are better (more
accurate and precise) because they have a known target (your eardrum) and a
limited range of temperatures (30-45C or so)
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, September 17, 2002 6:40 AM
Subject: Re: Gaps and caps


> Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<allanh-at-starband-dot-net>
>
> You can pick up an inferred camera for abut $39. from most of the
> electronics parts houses. Its a single chip camera mounted on a small PC
> board, about 3/4" square.
> I've used these and they work great. They can see a hot clothes iron in
the
> dark, or the flash of a remote control.
>
> allan
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, September 16, 2002 9:10 PM
> Subject: RE: Gaps and caps
>
>
> >
> > Original poster: "Mccauley, Daniel H by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
> >
> >
> >
> > Heck.  Why not just buy an infrared camera?????  They also have come
down
> > quite in price.  We have a few here at work which
> > work extremely well and they only cost about $45,000 each.  Gives that
> > predator-look to your coil.
> >
> > Dan
> >
> >
> >
> > Hi all,
> > Reading the latest concerning cap temps, and people checking them with
> their
> > hands and even their faces(!).  Why not purchase one of those neat temp
> > guns,
> > the kind where you point at the object, pull the trigger, and the temp
> comes
> > up
> > on an LCD screen?  They have really come down in price, and work
extremely
> > well.  This way temps could be checked during operation safely.  Used to
> use
> > them to check exhaust manifold temps between cylinders on trucks to find
> out
> > if
> > a cylinder wasn't firing properly.
> > Reading Gary Lau's response to Steve's sucker gap problems, and he
> mentioned
> > to
> > keep electrode size as large as possible for heat dissipation.  The last
> E-6
> > Mack engine that I had to overhaul had valve lifters which were about
2.5
> > inches long, approx. .5" dia., with a large (maybe .75-1.00") flare on
the
> > end.  The best part is that this flare is carbide faced, so should make
a
> > long
> > lasting electrode.  If anyone does look into this, check with a Mack
> dealer
> > or
> > diesel rebuilder to see if they have any old ones for free, as new ones
> are
> > outrageously expensive.
> >
> > John Richardson
> >
> >
> >
> >
> >
>
>
>