Engine heat max

[rcsinci]

I have acme condor .18 engine, what is the max heat I can get away with with this engine?

 

[Greywolf74]

I have acme condor .18 engine, what is the max heat I can get away with with this engine?

I'm not familiar with this specific engine but somewhere around 240F is generally considered safe for nitro engines but some engines like to run as hot as 270-280F. As long as the engine is operating correctly and isnt running too lean then somewhere in that ball park should be fine.