The attached picture is from my single rotor PP engine after about 10
 hrs running time. Most of the time was running at WOT and 6000RPM. fuel
 flow was around 8gph.
 If this an indicator of mixture distribution at ignition, what does
 it mean? if anything. Has that been observed by anyone else?

 Richard Sohn
 N2071U

 You got me. I have never seen anything like that.
 What kind of oil are you mixing?

 Paul Lamar


It looks to me like there is silicone partly blocking the coolant passage to
the left of the leading plug. There is a difference in the marking of the
housing to the left of the plug. Almost as if there is damage to the apex
seals as they cross the leading plug. Also of note is the burn mark before the
trailing plug. Could this be blow by past damage to the apex seals? There is
also a curious line across the housing just before the trailing plug. It also
looks like the apex seals were not following the rotor housing after the minor
axis indicated by the burn discoloration. How is the coolant flow with the new
end housings? I would put a thermocouple in as per Paul's description to
monitor the metal temp on further runs.

Dale Davies

Good call Dale. Richard is building his own end housings so that area
may not be getting as much water as it needs. Could also be your water pump
is not up to it Richard. As I recall the 2 rotor needs about 30 gallons
per minute.

Here is the picture from my book How to Cool Your Wankel.
"installing a "cylinder head temperature" gage. This can be done by drilling a small hole in the rotor housing in the place shown and installing a thermal couple."

BTW Mario called me from Germany this morning and took me to task
for the careless use of the word "Wankel" since he now owns the copyrights.

It is like copy and Zerox.

Paul Lamar