Engine goes bang bang bang!

[mike.perry]

I think that the spare crankshaft in my garage is an 803. It has been reground but I don't know how much.

[grovesa]

BTW - 120 compression is desperately low.......

I thought this too, however i have done a bit of research on the net looking at compressions i am aiming for, for my engine.
andf at a compression ratio of 7.2:1, the psi comes out at about 106

so 120 wasnt as bad as we thought...
could this be the cause of damage? or isnt it high enough

[bmcecosse]

It's desperately low........ but nothing to do with bang noise........