Coefficient of linear expansion for Al is 1/0.0000208 per
deg C
Cast Fe is
1/0.0000108 per deg C
piston crown gets to 500 deg C; so 500 x 0.0000208
=0.0104 or 1%
piston diameter 76mm...
1% is 0.76mm
or 30 thou!!!!!
This is 30 times 1 'Loren'....(8oD)
Miser Math[s] is Good Math[s]