cheers Phil, as soon as pop gets on road i Will be back on the 34, old man has been gettin on with it at last, its just buried under all my filler dust at min ha ha
Its detonation that usually kills the cast pistons, which is a function of CR, how efficient your blower is/heats the intake air, combustion chamber shape, a/f ratio (I always shoot for 12:1 afr in a boosted motor), how robust the pistons are to start with etc. Some blowers when pushed hard just start to gain extra pressure by heating the air which is really bad for intake temps and detonation.the only mods to the engine for the blower was a de compression plate - home made manifolds and a megajolt ignition system. nothing major - as said its not running much boost at the minute going to up it before it hits the road again to around 8 - 9 psi. I think much more that that and the decompression plate would have to go and some forged pistons would be needed but it starts getting expensive then so the boost will be staying around 8 psi ha.
I like the colour too - i nearly got persuaded to change it this time but its gonna be the same again.