Arias Pistons Acura RSX Type S Honda Civic Si 06-11 K20A2 K20Z1 K20Z3 86.5mm +0.5mm -6.79 cc 9.1:1



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In stock

SKU: A3321101 Categories: , , , Tags: , , , ,


Arias Pistons makes several part numbers for this application with a variety of different bore sizes, and compression ratios options. Please use the drop-down menus above to select the correct application for your build.

ARIAS PISTONS has been the leader in compact piston technology since our beginnings. While piston suppliers at that time focused mostly on larger-bore domestic V-8’s, ARIAS had the foresight to cater to the smaller-bore, higher-revving, hotter-running imports & domestic compacts.

Today, ARIAS maintains an unmatched advantage in the import and domestic compact market. Over three decades of research and development have led to the ARIAS Sport Compact shelf line.

  • Hi-tensile forged, not cast, billet material (4032 or 2618).
  • CNC machined working surfaces.
  • Optimized crowns for efficient combustion.
  • Diamond-turned ellipsoidal skirt profile.
  • All motor/Nitrous pistons feature lightweight, high strength construction.
  • Turbo/Nitrous pistons feature durable, heavy-duty design.


Item Weight 339 g
Shipping Weight (Dimensional) 5.2100
Part Type Pistons
Make Honda / Acura
Vehicle Model RSX Type S / Civic Si
Vehicle Group Civic Si 06-11 FA5 (Sedan), Civic Si 06-11 FG2 (Coupe), RSX Type S 02-06 DC5
Engine K20A2, K20Z1, K20Z3
Compression Ratio 9.1:1
Bore Diameter 86.5mm
Pin Size 0.866″ / 22mm
Included Ring Set T12865, S12865, O30865
Included Pin 866-2250-20CP1C
Head cc 50.5 cc
Face Type Dish
Dome cc -6.79 cc
Compression Height 1.180″ / 30mm
Manufacturer Arias Pistons
Stroke 86mm
Skirt Type Full Round
Rod Length 5.470″ / 139mm
Piston Material 2618
Compression Ratio Range 9.0:1 – 10.0:1
Bore Oversize 0.020″ / 0.5mm
Engine Head K20A2, K20Z1, K20Z3
Rod Length Oversize Standard Length
Carb Legal No
Stroke Oversize Standard
Wrist Pin Dimensions .866″ x 2.250″ x .200″
Pin Material 5100 Chrome Moly Steel
Product Flags N/A

Additional information

Shipping Weight 5.2 lbs
Part Type



Arias Pistons

Car Make

Acura, Honda


Arias Pistons

ARIAS PISTONS was brought to life in 1969 as a manufacturer and supplier of high performance, high quality pistons and related hardware. Arias is a leader in Sport Compact and Domestic high performance pistons.


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