[T2] CHT with Dakota gauge

[c.dreike]

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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