I have a significant temperature delta between the lid (about halfway up the
lid, actually) and the grate level when heating up my grill. The difference
diminishes after the grill is heated up. Here's what I posted on this
earlier:

I added a second thermometer to my six year old Weber Genesis 900 LP grill
(Home Depot 1000 with cast iron grates). I'm doing rotisserie coffee
roasting in it, and I wanted to compare temps in the center zone where the
roasting drum sits versus at the grill (which is where the stock thermometer
reads). I drilled a small hole with my Unibit (bought for the WSM temp mod)
in the center of the lid, about three and one-half inches down from the top.
The second thermometer also goes up to 700 F, where my Weber thermometer
pegs at 550.

I then ran a test of the difference in readings. During heat-up (all burners
on high) the grill runs about 125 F hotter than the center zone. However,
once the unit is fully heated (15-20 minutes) the temp difference is
negligible-- maybe 10 degrees. This is true at 250, 350, and 525 degrees.

Since running this test, I've replaced the grate thermometer with a Tel-tru
Weber replacement that goes up to 750 F and repeated the test. Same result,
with the grill and lid reaching 700F max after about 15 minutes.




"Steven T King" > wrote in message
...
> what are the mods?
> "cl" > wrote in message
> ...
> >
> > "CSS" > wrote in message
> > link.net...
> > > Both the lid and the grate, after about 12-15 minutes of heat-up.
> >
> > That is odd. I've measured 1000deg at the grate (thermocoupler was
smoking
> > and I didn't want to burn up a 75$ probe) and maxed around 800 at the
hood
> > thermometer with my modded JennAir. I had the same relative temperature
> > difference before mods. So you have no temperature difference between
the
> > grate and hood on that weber?
> >
> > -CAL
> >
> >
> >
>
>