Originally Posted by
Maximo
Go engines do not hold pinch nearly as long as Picco engines do...Picco uses a harder billet piston material which takes longer to wear into the sleeve...Go use a softer cast piston that wears in much faster then the Picco will....... so everything your noticing is perfectly normal..
How do you know this? I can not verify which engine will hold it's pinch longer as I've only ever ran one Picco and it was used. By looking at the piston on a Go it looks to be a silicon aluminum alloy as Massive mods said. I can tell you that there is no Billet aluminum as hard as high silicon aluminum. In V8 motors in big cars it's called Hypereutectic aluminum, I have tried to machine valve pockets in this stuff and it eats up carbide inserts. Os looks like it uses billet aluminum on the V-spec piston and it doesn't hold a pinch as long as other motors.
Rex