[T2] CHT with Dakota gauge

[c.dreike]

Safe Travels Sami,

Chris


On 8/24/2015 8:50 PM, Sami Dakhlia wrote:
> I may have used the wrong term. By O-ring I meant the plated copper 
> ring of the sensor. There's no plastic o-ring there. Sorry if I wasn't 
> clear.
> Plug (singular, I only checked #3) is grey, not light brown and 
> definitely not slightly black.
> I parked the bus and am on my way back to Europe. Will continue the 
> odyssey next summer :)
> BTW, found an oil leak at the right valve cover, so put in a new 
> gasket. The leak is new; I checked the valves a few days ago and 
> didn't have new gaskets handy. Definitely a source of false air, but 
> didn't get a chance to test drive afterwards.
> Cheers,
> Sami
>
> On Monday, August 24, 2015, c.dreike <c.dreike at verizon.net 
> <mailto:c.dreike at verizon.net>> wrote:
>
>     Sami,
>     I looked at the photo. Never seen a spark plug with an O-ring. In
>     any case. That o-ring is a bit of plastic. If its seeing 450F. It
>     should be rather frazzled as would be your valves. I would bet
>     that the real temperature is something south of 400. How do the
>     plug tips look? Normal light brown or slightly black? A good
>     indicator that the engine is running within limits.
>
>     Try dunking the sensor into a pot of boiling water for a reality
>     check at 212F. You could add a bunch of sugar and keep boiling
>     with a candy thermometer until the hard crack stage, 295-309, or
>     brown caramel at around 338F. The water or sugar should not hurt
>     the thermocouple junction.
>
>     Cheers,
>     Chris
>
>
>     On 8/24/2015 2:49 PM, Sami Dakhlia wrote:
>
>         Update on CHT. First of all, here's a picture of the sensor's
>         o-ring,
>         stretched into an egg shape on the first installation.
>         https://www.dropbox.com/s/oon7ftj96sbfldt/file%2024-08-15%2014%2032%2006.jpeg?dl=0
>         My best guess is that the crimped part got caught on the edge
>         of the plug
>         hole recess. I tried to bend it back into something closer to
>         a circle, but
>         I'm pretty confident there's still going to be exhaust leak at
>         the plug,
>         which would contribute to the scary high CHT readings.
>
>         Second, after adjusting the AFM per the itinerant air cooled
>         website, there
>         has been some slight improvement: temps dropped from 435 to
>         425 at 55 mph.
>         They dropped another 15 degrees when cruising at 50 mph
>         instead, which I
>         did today on I-5 and I-405 from San Diego to LA. The slightest
>         incline
>         brought about a 15 degree increase uphill and a 15 degree drop
>         downhill. I
>         think I'm going to fiddle with the AFM a bit more this
>         afternoon, in the
>         hotel parking lot.
>
>         Then again, I already had more than enough "fun" with the old
>         bus this
>         summer. This long-distance relationship is not working out too
>         well. Maybe
>         time for me to ship the bus to France, or for me to move back
>         to the U.S...
>         :)
>
>         Cheers,
>         Sami
>
>
>         On Saturday, August 22, 2015, Sami Dakhlia
>         <sami.dakhlia at gmail.com> wrote:
>
>             Quick update: found a small vacuum leak. Vacuum hose to
>             fuel pressure
>             regulator was cracked.
>             Also followed
>             http://www.itinerant-air-cooled.com/viewtopic.php?t=7761
>             instructions
>             to check and tune the AFM. Idle mixture screw had been
>             messed with and was
>             tightened all the way in. In addition, the engine
>             responded well to a
>             richer mix across the rpm range. Will do a test drive in
>             the morning.
>             Cheers,
>             Sami
>
>             On Wednesday, August 19, 2015, Sami Dakhlia
>             <sami.dakhlia at gmail.com>
>
>                 wrote:
>
>                     hi Volks,
>                     Installed a Dakota Digital cylinder head temp
>                     gauge (hat tip to R.
>                     Atwell) and took off this morning on a trip from
>                     the Bay Area to Santa
>                     Barbara. Holy $h!t! The readings are much higher
>                     than I thought was the
>                     norm. Basically cruising at 55 mph, with
>
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