Forged pistons and rods questions

4GTuner

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Thats good to hear JC :)

TRQ-STR - talk to your machinist about it as he;s the one ultimately responsible for making sure he does it right. Submit the pistons and block etc to him and he'll measure each piston individually to obtain its 'true' dimensions and bore the block to suit each piston to its own bore. Yeah the Wiseco insignia and Amorglide coating was on Godfather's pistons too. Dont you dare go to 0.0060" on your daily driven street car!!

Baz, the black coating didnt look to me like other types of coating you usually find on coated pistons - it almost looked like it was printed on and hard, not soft. I havent pulled out any used Wiseco pistons from an engine before personally but I do recall seeing photos of pistons people have removed and the black skirt coating was virtually still intact. I doubt its designed to wear off immediately during run in at all, what's the point of that? The coating is designed to reduce friction and wear for as long as possible.

To double check Ive done a quick search and found the following:
It is a permenant skirt coating that reduces friction, protects against cold seizures, and takes up some of the cold running clearance to quiet the parts. It is an awesome coating that actually improves performance through reducing friction and making the skirt profile match up to imperfections in the cylinder wall as perfect as possible. It does not come on all Wiseco pistons.

Also have a read of this info below on a Wiseco piston distributor site. It's also suggesting that it 'remains bonded to the base material for the typical life of the piston'.
 
Thanks guys for all the comments you have all been very helpful.

To my understanding wiseco's specified piston to wall clearance was to be applied over the total diameter of the piston, but I just wanted some confirmation. Glad some people know what their on about :)

This will mean that when i go with .003" i will have .0015" clearance on each side of the lower skirt. rather than the excessive .003" on each side which has been stated on some other forums.
 

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