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Toymods Vice President
Location: Sydney
Registered: May 2002
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Re: question on pistons
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Mon, 29 August 2005 02:24

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Yes aftermarket pistons will come with a spec sheet that indicates the relevant bore measurements for skirt clearance.
Yes Arias do have a range of pistons with higher silicon content which makes them harder and reduces the thermal expansion rate. This means they can be run with less bore clearance when cold because they don't grow as much when hot. On the other hand "hard" is not really what you're looking for in a piston, it makes them more brittle and likely to crack.
Taking an 86mm bore as an example most forged pistons specify a 3.5 thou skirt clearance. My Arias pistons specified 2.5. All of the newer Arias pistons I have seen though specify 3.5 thou. They changed the design to be more like the other cheap forgies like JE etc.
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