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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 06-11-2009, 02:18 PM   #1
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Piston to Wall Clearance

does anyone know what this value is for a 2001 base 9-3? There are 90.0mm JE pistons and rings in it, and the head is out for some work. the engine is being resealed and re-ringed, but the clearance looks a little loose... anyone with any help in this matter would be greatly appreciated! thanks!
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Old 06-12-2009, 02:40 AM   #2
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Nick should be able to tel you, but I know there are different piston classes for stock pistons like AA AB and so on. The letters designate the class piston which tells you the dimensions in WIS.
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Old 06-15-2009, 07:17 PM   #3
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Originally Posted by wasaaabi View Post
does anyone know what this value is for a 2001 base 9-3? There are 90.0mm JE pistons and rings in it, and the head is out for some work. the engine is being resealed and re-ringed, but the clearance looks a little loose... anyone with any help in this matter would be greatly appreciated! thanks!
You should have the machine shop check the bores to determine if they are still within the wear guide and if they are, you set the ring gap up for the JE pistons, not much choice once its worn some. It will be good for bigger power, but may have a little blow bye.

If the bores are bell shaped or out of spec, then its time to bore them to 90.5mm and get the next size up in pistons.

A proffessional cross hatch hone, proper ring gap and a proper break in procedure are most important for a good seal. You don't want to be too rich or lean during break in. Pressure/Vacuum over and over. No idle on first start, 1500-2k until warm, then heat cycle or get on the road and start the seat process.

John
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