Parts Now Pay Later with
Log In Cart
Log In

Create An Account

Log In Cart
Your Cart Is Empty
Free Shipping Over $299.99

Free Shipping Over $299.99

Orders of $299.99 or more ship free within the continental U.S.
Shipping to Alaska and Hawaii is additional and not included.
We do not ship international at this time.

Shipping Policy

Supertech K-Series 86.5mm 12.5:1 Pistons
Part Number: P4-HK8650-P15

Supertech K-Series 86.5mm 12.5:1 Pistons-A1
Images may be for reference only

Supertech K-Series 86.5mm 12.5:1 Pistons
Part Number: P4-HK8650-P15

Be the first to review!
Was: $712.81
$570.37 & Free Shipping
Save: $142.44 (20%)

Reward Points

It pays to shop with K Series Parts and our reward points program! For every $1.00 you spend you earn reward points.

They are easy to earn, just log in to your account when you check out. If you don't have one it is free and easy to setup.

They are easy to use during check out. Click on the "Have Reward Points?" on the shipping and payment selection page.


Reward Point Program Details

You earn 2 points for every $1.00 that you spend.

100 points equal a $1.00 discount.

Maximum discount per order is 5% of the order total.

There is no minimum order total to redeem points.

Points do not apply to shipping or sales tax.

Points are not redeemable for cash.

The point value per dollar, points earned per purchase, and order minimum are subject to change.

Earn 1141 reward points. Learn More


Out of Stock
Enter your email address to be notified when it is back in stock.

Product Details

Part Number: P4-HK8650-P15
Compression Ratio: 12.5:1
Bore: 86.5mm
Brand: Supertech

Supertech 86.5mm Bore 12.5:1 Compression Pistons for Acura/Honda K-Series Engines

  • Manufactured from extruded high silicon, enhanced 4032 alloy (with additional Cu, Ni & Mg) that has low thermal expansion and features excellent wear resistance.
  • Withstood up to 42psi of turbo boost with alcohol, without any problems.
  • 2 or 3 step forging process that yields a fine structural grain orienting the fibers in the same direction of the stress.
  • Several heat treatments for an evenly distributed hardness and extremely high tensile strength.
  • Goes through several machining steps specifically designed to ensure dimensional precision, perpendicularity and flatness of the ring grooves.
  • Reduction grooves
  • Honed and reamed pin bores for the most precise fit
  • Wrist pins are constructed of cold extruded chrome moly steel for high strength to be used with wire clip locks
  • Rings are not included - requires Supertech 86.5mm Piston Rings (GNH8650)

Due to the manufacturer's price control policy, this item may be excluded from promotions and discounts

WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.

Vehicle Fitment

Acura RSX
2002 Acura RSX Automatic 2003 Acura RSX Automatic 2004 Acura RSX Automatic 2005 Acura RSX Automatic 2006 Acura RSX Automatic
2002 Acura RSX Manual 2003 Acura RSX Manual 2004 Acura RSX Manual 2005 Acura RSX Manual 2006 Acura RSX Manual
2002 Acura RSX Type-S 2003 Acura RSX Type-S 2004 Acura RSX Type-S 2005 Acura RSX Type-S 2006 Acura RSX Type-S
Honda Civic
2006 Honda Civic Si Coupe 2007 Honda Civic Si Coupe 2008 Honda Civic Si Coupe 2009 Honda Civic Si Coupe 2010 Honda Civic Si Coupe 2011 Honda Civic Si Coupe
2002 Honda Civic Si Hatchback 2003 Honda Civic Si Hatchback 2004 Honda Civic Si Hatchback 2005 Honda Civic Si Hatchback
2007 Honda Civic Si Sedan 2008 Honda Civic Si Sedan 2009 Honda Civic Si Sedan 2010 Honda Civic Si Sedan 2011 Honda Civic Si Sedan

Reviews ★★★★★ ★★★★★

No Reviews Yet!

Write a Review