I need help!!!!
I run in Mexico City on an altitude of 9,842 ft above sea level an Inferno GT from Rally Game with 40% nitro, my problem is the glow plug blow up, and I see a lot of carbon deposits in the chamber and head top.
I hear that the head clearance is calculated according to the amount of nitro used, in this forum most of the categories run at sea level and 25% nitro. My question is: The higher the altitude more head clearance?? the more nitro more head clearance?? or Do I have to change the Glow plug?? I use an .21 O.S.Max with an #8 O.S. Max glow plug.

Thank you very much.

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