JE Forged Piston Kit (84.0mm, 9.0:1 CR) - NA8/NB Miata (94-05)

JE forged piston kit for the Mazda 1.8L BP engine used in the Miata, sized for an 84.00 mm (3.307 in) bore. The crown is JE's inverted dome/dish design with a piston volume of -2.70 cc, and JE rates the kit at 9.00:1 compression. The kit is a set of 4 pistons with wrist pins, locks and rings; the stock BP bore is 83 mm, so the block must be bored to suit.

• JE-rated 9.00:1 compression ratio; JE states no conditions for this figure (no stroke, chamber volume, gasket or deck values), so the final ratio depends on your head, gasket and deck
• 84.00 mm (3.307 in) bore, 1.205 in compression height, -2.70 cc piston volume
• Forged from 2618 aluminum; JE lists the forging type as round
• Includes 4 pistons with wrist pins, locks and JE Pro Seal piston rings (0.040 in top / 0.048 in second / 0.111 in oil)
• Wrist pins 0.787 in (20 mm) diameter x 2.250 in long, 0.180 in wall
• JE features listed for this kit: accumulator groove, double pin oilers and skirt coating; average piston weight 301 g

Fitment: 1994-1997 Mazda Miata (NA8, 1.8L) and 1999-2005 Mazda Miata (NB, 1.8L) with the block bored to 84.00 mm. JE lists this kit by engine (Mazda BP Series, 1.8 BP Miata cylinder head) and does not publish model years; the years shown are the Miata years for that engine. Not for 1990-1993 1.6L cars. Have a machine shop confirm bore size and piston-to-wall clearance before assembly.

Part number: JE Pistons 255774

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