33 replies to this topic

[cooperrodeo]

I'm slightly surprised that a hairline crack which hardly anyone of us can see would let so much sooty exhaust gas through to mark the pistons in the way mra-minis observes.

[bjgaunt]

The crack is there, had it checked... drops about 1mm over the edge of the bore

[MRA]

The combustion chambers can reach 1000 degrees, this engine was also fitted with NOS injection, so internal pressures coupled with the heat generated in a race engine could have contributed to opening the crack a little more than you can see in the photo.

[Mini Mad Drakeley]

you can just about make out the crack and sorry to hi-jack this thread but can someone explain what offset boring is and what it actually does?

thanks, Adam