Do the STEP2 Forged Pistons for SR20DET work with the stock crankshaft?

No. HKS sized these short-height pistons for its 91.0mm stroke forged crankshaft 23006-AN001 and states that they are not compatible with stock connecting rods. The HKS H-beam conrod set 23004-AN001 and the HKS crankshaft are both required and sold separately.

What does the piston set include?

The HKS 21003-AN001 set includes four forged pistons, four sets of top, second and oil rings, four 22mm piston pins, eight snap rings and an installation manual. The crankshaft, connecting rods, head gasket and bearings must be sourced separately before assembly.

Does the block need machining?

Yes. The 87.0mm pistons are 1.0mm over the factory bore, so the cylinders must be bored and honed to the size marked on each piston for a clearance of 0.020 to 0.040mm. HKS also requires recess modification of the block and baffle plate.

What compression ratio do the pistons give?

HKS lists a compression ratio of 8.8 for the STEP2 Forged Pistons for SR20DET with the factory 46.1cc combustion chamber and a 1.2mm HKS head gasket. A thicker HKS gasket lowers the ratio, and the engine builder should confirm the final figure.

Is a tune required after installation?

Yes. Raising displacement from 1,998cc to 2,164cc and changing the compression ratio alter the fueling and ignition the engine needs, so the engine management must be tuned by a qualified tuner. HKS also specifies a break-in of 1,000 to 3,000 km.

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Description

HKS 2.2L STEP2 Forged Pistons for SR20DET Nissan Silvia and 180SX

The HKS STEP2 Forged Pistons for SR20DET are the 87.0mm piston set from the HKS 2.2L STEP2 capacity upgrade kit, sold separately from the complete kit. The forged short-height pistons carry nickel plating at the top and an Ober coated skirt, and with the HKS 91.0mm stroke crankshaft they take the engine to 2,164cc. They work only with that crankshaft and the HKS H-beam rods, so they are the wrong choice for a stock-stroke rebuild and the right one for an S13, S14, S15 Silvia or 180SX stroker.

Features

Forged short-height pistons with the compression height cut from the factory 32.0mm to suit the 91.0mm stroke
Nickel plating at the top of each piston and Ober coating on the skirt
Titanium coated top ring
Ring pack of 1.0mm top, 1.2mm second and 2.0mm oil rings, each narrower than the factory rings
Four pistons with rings, 22mm pins, snap rings and the HKS installation manual

Specifications

Bore: 87.0mm (1.0mm over the factory 86.0mm)
Displacement with HKS 91.0mm crankshaft: 2,164cc
Compression height: 29.5mm
Crown cavity volume: 15.3cc
Compression ratio: 8.8 with a 1.2mm HKS head gasket (46.1cc chamber)
Piston pin: 22mm diameter, 60mm long
Piston-to-wall clearance: 0.020 to 0.040mm

Applications

Nissan 180SX: RPS13 | 1991-1998 | SR20DET
Nissan Silvia: PS13 | 1991-1993 | SR20DET
Nissan Silvia: S14 | 1993-1998 | SR20DET
Nissan Silvia: S15 | 1999-2002 | SR20DET

Notes

Pistons only: the HKS 91.0mm crankshaft 23006-AN001 and the HKS H-beam conrod set 23004-AN001 are required and sold separately
HKS states that these pistons are not compatible with stock connecting rods
Boring and honing are required, plus recess modification of the cylinder block and baffle plate
Professional installation by an experienced engine builder is required
Engine management tuning is required, and no ECU or tune is included
HKS warns that valve timing set beyond the limit in the manual for the STEP2 Forged Pistons for SR20DET causes valve-to-piston interference
The North American 240SX was sold with the KA24, so this part applies only to a chassis fitted with the SR20DET
This part is intended for off-road or competition use where emissions laws apply, and the buyer is responsible for checking local regulations

Frequently Asked Questions

Do the STEP2 Forged Pistons for SR20DET work with the stock crankshaft? No. HKS sized these short-height pistons for its 91.0mm stroke forged crankshaft 23006-AN001 and states that they are not compatible with stock connecting rods. The HKS H-beam conrod set 23004-AN001 and the HKS crankshaft are both required and sold separately.
What does the piston set include? The HKS 21003-AN001 set includes four forged pistons, four sets of top, second and oil rings, four 22mm piston pins, eight snap rings and an installation manual. The crankshaft, connecting rods, head gasket and bearings must be sourced separately before assembly.
Does the block need machining? Yes. The 87.0mm pistons are 1.0mm over the factory bore, so the cylinders must be bored and honed to the size marked on each piston for a clearance of 0.020 to 0.040mm. HKS also requires recess modification of the block and baffle plate.
What compression ratio do the pistons give? HKS lists a compression ratio of 8.8 for the STEP2 Forged Pistons for SR20DET with the factory 46.1cc combustion chamber and a 1.2mm HKS head gasket. A thicker HKS gasket lowers the ratio, and the engine builder should confirm the final figure.
Is a tune required after installation? Yes. Raising displacement from 1,998cc to 2,164cc and changing the compression ratio alter the fueling and ignition the engine needs, so the engine management must be tuned by a qualified tuner. HKS also specifies a break-in of 1,000 to 3,000 km.

About HKS

HKS is a Japanese performance engineering brand founded in 1973 and headquartered in Fujinomiya, Shizuoka, with a long-standing reputation for developing high-quality aftermarket parts and motorsport-proven technology for enthusiast and professional applications. Known for innovations in turbocharging and engine performance, HKS produces a broad range of components including exhaust systems, turbo kits, electronics / engine management, and suspension solutions, with product development heavily influenced by decades of involvement in racing disciplines such as circuit time attack, drag, and drifting.

Additional Information

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Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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HKS 2.2L STEP2 Forged Pistons for SR20DET Nissan Silvia and 180SX [21003-AN001]

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HKS 2.2L STEP2 Forged Pistons for SR20DET Nissan Silvia and 180SX

Features

Specifications

Applications

Notes

Frequently Asked Questions

About HKS

Reviews