I have a set of used JE pistons from my old engine that were overheated and one piston transferred aluminum to the cylinder wall. Not good.... I know.
So I'm building another shortblock and want to see if any of the others can be salvaged. They have about .007-.008 clearance measured with a caliper (horseshoe shaped device) on the piston skirt.
The worst one measured .018 clearance and it was a .020" overbored block.
I'm pretty sure these tolerances are too loose.... but don't forged aluminum slugs expand more? What if I had the skirts dry film coated to take up some of the clearance? Is this a waste of money?
Do I have 6 matching lightweight ashtrays now or what?
I just don't feel like spending another $500 if I don't have to.
GNX7
So I'm building another shortblock and want to see if any of the others can be salvaged. They have about .007-.008 clearance measured with a caliper (horseshoe shaped device) on the piston skirt.
The worst one measured .018 clearance and it was a .020" overbored block.
I'm pretty sure these tolerances are too loose.... but don't forged aluminum slugs expand more? What if I had the skirts dry film coated to take up some of the clearance? Is this a waste of money?
Do I have 6 matching lightweight ashtrays now or what?
I just don't feel like spending another $500 if I don't have to.
GNX7