Originally Posted by
22Racer
The name pinching sounds a little crude, resizing just sounds better. There are different way to do it but only 2 people I know of that actually sell equipment to do this and it can cost over $1000.00 to buy equipment.
The same result is attained no matter who does it, of course some do a better more accurate job than others. The sleeve is squeezed smaller at the top to create metal pinch like when it was new. I do not pinch the sleeves nearly as tight as new as the piston and sleeve are already mated to each other. There are a couple people (myself included) that you can send the whole engine to and have the crank and rod measured, inspected and check the bearings etc. If the crank is worn it can get quite expensive to replace the crank, rod etc. and may not be worth rebuilding depending on the brand.
Rex
Cool that's worth knowing, I've only ever had second hand engines which I've picked up cheap (Apart from my N12-3T).. I've found this is a cheaper way to race than rebuilding.
I've an old Orion CRF Wasp .12 which is absolutely ballistic! which is backup to my IDM Evo 4 .12, which i'm still to actually try out!
If I'd dropped the cash on a Keep-On I'd make sure I rebuilt it or pinched it when it was dead, but not worth it when you're buying engines for £60.