DA's do tend to run fairly cool compared to some other engines in our applications and even more so if a little rich.

Oh by the way, I was in Indiana for a quick trip a few days ago. My God the humidity just about killed me!! I'll take 100*F with no humidity over that 90+F with over 90+% humidity. Thought I was going to heat stroke after hauling many many packages up four flights of stares in a non air conditioned building with no fans
There is no way in h$ll you would get me out flying standing in the sun all day with weather like that..............

Yep, the heat & humidity has been near unbearable the past week or so. Yesterday & today it's been near perfect!
Day I did my cyl head temp check it was 73 F, and low humidity.

I usually go out just after sunup and by 11:00 I'm usually done. By then my couch, the dog, and the History Channel are calling me.[sm=redface.gif]

Got a better run today. This graph includes the first from last weekend, and 2 runs today of about 9 minutes each.
I put the inverted Pitts style (twin pipe) muffler back on it. Highest temp=234.7 (F.)

I don't want mine reaching 200C and get nervous at 190C; 180C is really my desired upper limit. Very lightly loaded at 200C (394F) might work but I have nothing to back that up. Heavy loading at 200C and above is a death sentence like T.O.M. said. We ran a DA50 at extreme temps and the ends of wrist pin were the first thing to go. It just chewed the ends up "real" bad. A new pin, piston, and ring and she ran like new but we learned a good lesson on that one.

Jezmo,

Gasser ? Gow engine? 200 degrees C.

Pictures of my MVVS glow engine with thremocouple for my Top Flite Taurus engine. Important part of electronics is the + 200 degrees Celsius detector to see if on any moment during the flight the engine head temp was above than 200 degrees. I also can take samples during flight.
How do you measure the head temperature?

Cees

Put a thermal couple in between the cylinder fins, at top, on back side of engine.

a1pcfixer,

Are your measured values as representative as ours?'

For me 150 - 180 degrees C is normal for a operating glow pliug engine, be measured by a thermocouple connected with the sealing washer of the glow plug.

Cees

See post #77 above.

I'm running cool even for a gasser.
Graph is in F, not C.

a1pcfixer

I did see that values, only difficult to compare.
200 degrees C max limit for the temperature of the plug looks to be representative and reproducible for glow and gasser

Cees

Here's a great conversion program & it's FREE!
Converts all sorts of values.

[link=http://joshmadison.com/software/convert-for-windows/]Convert for Windows.....[/link]

Jim,

converting is no problem, point of measuring isn't the same.
I read a temperature you did measure of 234 F is 113 C and I measure always above 150 degrees C.

You write:
Sensor is against the cyl wall, between the two largest cooling fins, on the back side of the engine.

Jezmo does show us the absoluut max temp of 200 degrees, and that has to be a contact temperature on the basic, or washer/sealring of the sparkplug. (I think?)
For me also there is one place to use, the glowplug seal ring.
Also for glowplug engines the temperature is between 160 and 180 degrees C , and I became nervous above 180!
My proposal would be, only compare contact temperatures of basics of spark or glowplug.
There are two elements Pt100/500/1000 or thermouple to use for that (I think), thermocouple is more rigid and better to install and so often used.


Cees