Originally Posted by
stefan
It depends a bit on how high you are compared to sea level.
At sea level .5mm is ok for a 12 engine. At 550 m we run .45mm clearance (not shims)
I thought actual head clearance for .12 engines at sea level for various nitro % fuels was as this:
16% nitro .36mm - .4mm
20% nitro .4mm - .5mm
25% nitro .5mm - .6mm
30% nitro .6mm - .65mm
so for 16% nitro, that I am using, .5mm is kind of high.
Wouldnt someone gain more torque if .36mm-.4mm actual head clearance is used, instead of the factory .5mm clearance?