Wiseco Professional Honda B18 Piston Set of 4 - 81.25 mm Bore - 30.00 mm CH, 5.00 CC
Wiseco Professional Honda B18 Piston Set of 4 - 81.25 mm Bore - 30.00 mm CH, 5.00 CC
Wiseco Professional Honda B18 Piston Set of 4 - 81.25 mm Bore - 30.00 mm CH, 5.00 CC
Wiseco Professional Honda B18 Piston Set of 4 - 81.25 mm Bore - 30.00 mm CH, 5.00 CC

Wiseco Professional Honda B18 Piston Set of 4 – 30.00 mm CH, 5.00 CC

$1,360.69

or 4 interest-free payments of $340.17 with Afterpay

Available to order – dispatched in 1-2 business days

Bore 81.25 mm · Compression height 30.00 mm · Volume 5.00 cc · Set of 4 · rings included · wrist pins included

Heavy / oversize item — freight quoted to your addressOrder now and we will confirm the exact delivery cost to your address before dispatch — no guessed freight, you only ever pay the real rate. Prefer a price first? Contact us for a freight quote.
Freight quoted after you order - we confirm the cost to your address before dispatch
Check fitment by rego or VIN
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Willys Workshop · Oxley & Warana, QLD
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Returns within 30 days
12 Month Warranty
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Returns within 30 days

12 month warranty

Will it fit your vehicle?

MakeModelSeriesYearsEngine
Honda————

A dash means the listing does not narrow it down that far (for example no build dates are listed). Check with us if your vehicle was built near a model change.

Fitment listings are a guide. Not sure? Send us your rego or VIN and our team will check the part for your vehicle, before or after you order.

Check my fitmentor call(07) 5619 7869

Description

Wiseco Professional Series forged piston sets for the Honda B18, offered in 2 bore sizes: 81.25 mm and 82.00 mm. Every option shares the 30.00 mm (1.181 in) compression height and +5.00 cc dome. Each set comes with rings and wrist pins.

What’s in the box

  • 4 forged pistons
  • 4 wrist pins (21.00 mm / 0.827 in diameter, 5115 steel, floating)
  • Piston ring set

Matching it to your Honda B18

Crown volume is quoted as +5.00 cc: a positive figure means a dome that takes volume out of the combustion chamber. Work out the compression ratio for your combination (chamber volume, gasket bore and thickness, deck clearance) before you order.

The bore size is the finished bore these pistons are made for, so have the block measured and then bored and honed to suit, with piston-to-wall clearance set to Wiseco’s figure for the option you choose.

Material: 2618 aluminium, the low-silicon alloy usually chosen for boosted and high-load engines (it needs more piston-to-wall clearance than 4032).

Ring grooves: 1 mm top, 1.2 mm second and 3 mm oil.

Options and part numbers

Option Wiseco part no.
81.25 mm K566M8125
82.00 mm K566M82

Specifications (all options)

Compression Height 30.00 mm
Engine Detail Honda B18
Forging Type Positive Dome
Oil Ring Thickness 3 mm
Piston Material 2618
Piston Quantity 4
Piston Volume 5.00 cc
Ring Set Included Yes
Second Compression Ring Thickness 1.2 mm
Skirt Coating Yes
Top Compression Ring Thickness 1 mm
Wrist Pin Included Yes
Wrist Pin Material 5115
Wrist Pin Outer Diameter 0.8268 in
Wrist Pin Style Floating

Boostline conrods listed for this engine family: Boostline Connecting Rod Kit | Honda B18A 137mm | ARP2000, Boostline Connecting Rod Kit | Honda B18C 138mm | ARP2000, Boostline Connecting Rod Kit | Honda B18A 137mm | ARP625+. Match the rod length to the pistons before you order.

More: Honda B-Series forged pistons · all performance pistons · Wiseco

Shipped Australia-Wide

  • Dispatched from within Australia with tracking.
  • Available to order – dispatched in 1–2 business days.
  • Freight is quoted after you order – we confirm the cost to your address before dispatch.
  • Delivery usually takes 2–10 business days after dispatch, depending on your location.
  • Need your tracking number? Once your order has shipped, email sales@willysworkshop.com.au with your order number and we’ll send you the carrier and tracking details.

Freight question? Call us on (07) 5619 7869.

Additional information

Make

Honda
Bore size

81.25 mm, 82.00 mm

Warranty: 12 months from Willys Workshop

Sold and warranted by Willys Workshop. Parts carry our 12-month warranty against defects, from the date of purchase or installation (whichever is later), subject to any manufacturer terms and fair wear and tear (Terms & Conditions, clause 7.1(b)). This is in addition to your rights under the Australian Consumer Law, which cannot be excluded.

  • 30-day change-of-mind returns on eligible items: unused, uninstalled and in the original packaging, with a Return Authorisation from us first. A 15% restocking fee applies and return postage is at your cost.
  • Wrong fit: if a part covered by our Fitment Guarantee doesn’t fit, we pay the return freight both ways and there’s no restocking fee.
  • Special-order or imported-to-order items, electrical parts, ECUs and tuners once registered, connected or flashed, parts that have been fitted or modified, and clearance items can’t be returned for change of mind. Your rights for faulty goods still apply.
  • Refunds are made to your original payment method within 14 business days of us receiving and inspecting the return.

Full details: Returns & Refund Policy and Terms & Conditions.

Warranty claims are coordinated through Willys Workshop. Email sales@willysworkshop.com.au or call Warana (07) 5619 7869 / Oxley (07) 3377 3421 with your order number and a description of the issue.

Questions, or need a fitment check?
Send your rego or VIN and our Australian-based team will manually confirm fitment before you buy.
📞 Call (07) 5619 7869✉ Email us
Prefer to text your rego/VIN? 0485 885 957

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