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Thanks to CW for a useful answer.
Yes, LyCon jugs have these holes, but I am working on a VW conversion.
After due deliberation, I think I am going to go the way you went -
spark plug gasket sender under one of the head stud washers, hopefully
the closest to the exhaust port. The CHT sensor boss on the late model
heads is actually measuring the temperature at the rocker box rim,
which is hardly the hottest place on the head. Fine if you're using
it for mixture control, but I am using it as a warning, so that
location, while it is less prone to mechanical damage than the usual
sensor-under-the plug deal, iis not so great for accurate indication
prior to head melt-down.
On May 12, 6:23 pm, CW Crane <cwcr...@sbcglobal.net> wrote:
> "Kyle Boatright" <kboatrig...@comcast.net> wrote:
> >On Lycoming cylinders, I believe the CHT boss is already drilled and tapped.
> >I know they were on mine.
>
> >KB
>
> There is a pipe like fitting that is screwed into those holes. The CHT probe
is
> then inserted into the fitting and a BNC like cap compresses a spring that
holds
> the tip against the head (at least it was that way with the Grand Rapids EIS
> that I used). The hole in the cylinder head isn't very deep at all. Maybe
3/8
> inch. It is really like one of those digital thermometers that you push
against
> your head inside your ear.
>
> In another application I couldn't use the 14mm spark plug probe since I had
10mm
> spark plugs and instead just put it under one of the head nuts on my VW.
>
> CW
>
>
>
> >"flybynightkarmarepair" <ryo...@lmi.net> wrote in message
> >news:1178951918.733343.47970@p77g2000hsh.googlegroups.com...
> >> How deep is the hole a "bayonet" type CHT probe fits into?
>
> >> I do not like the spark plug senders, and want to drill the cast-in
> >> boss for a CHT sender to suit the probes commonly available, but
> >> without a probe in hand, I cannot tell whether this is possible.
>
> >> Anybody who can answer this question already knows what they look
> >> like, but this forum serves an educational purpose for people other
> >> than me, hopefully, so here is what I have talking about:
>
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Re: CHT probes
