Hot cylinder and knocking noise right after rotation

[lvpazik]

#4 started running hot right after rotation and a minute into climb out. Analyzer showed 500 degrees.  Then heard what I thought was a knocking and could smell something. Immediately put to idle, turned back and safely landed. When at idle, temp is normal and no knocking. I live 60 miles outside of Vegas in Pahrump. Have my own hangar with power but no running water. 74P is airport. I have a career mechanic on field but he worked mostly for the majors and prefers staying away from certified aircraft. Anyone out there in Southern Cal or Arizona that can fly in and diagnose? Hoping it's just a cylinder. If it is would want same person to remove it and I'll get a replacement cylinder for installation. I know this is a stretch but thought I'd ask....

[Fly Boomer]

59 minutes ago, lvpazik said:

#4 started running hot right after rotation and a minute into climb out. Analyzer showed 500 degrees.  Then heard what I thought was a knocking and could smell something. Immediately put to idle, turned back and safely landed. When at idle, temp is normal and no knocking. I live 60 miles outside of Vegas in Pahrump. Have my own hangar with power but no running water. 74P is airport. I have a career mechanic on field but he worked mostly for the majors and prefers staying away from certified aircraft. Anyone out there in Southern Cal or Arizona that can fly in and diagnose? Hoping it's just a cylinder. If it is would want same person to remove it and I'll get a replacement cylinder for installation. I know this is a stretch but thought I'd ask....

I'm not anywhere near you, so no suggestions on a mechanic, but I have been able to recruit a mechanic to come to my hangar, so keep searching.  I certainly wouldn't fly it anywhere. 

[GeeBee]

Yikes! Sounds like detonation.

 

[PT20J]

Sorry to hear that.

Given the very rapid CHT rise, it was probably preignition. You can check the spark plugs for damage -- a common cause of preignition is a broken insulator. You might want to use a borescope to check the piston for melting around the edges. But, if it reached 500 F, according to George Braly, the cylinder probably needs to be replaced. 

[lvpazik]

Ran compression check on all cylinders.  #2 is dead. 1,3,5 all very good. I've ordered 3 brand new cylinders to replace 2,4,6. Already had 1,3,5 rebuilt about 18 months ago....couldn't find new anywhere....