Product Overview
Wiseco Forged Piston for Toyota Supra 2JZ-GTE
Upgrade your Toyota 2JZ-GTE engine with the Wiseco W6678M8625AP forged piston, developed for high-performance street, competition and serious engine builds.
Designed specifically for the legendary Toyota 2JZ-GTE 3.0-litre 24-valve six-cylinder engine, this Professional Series piston uses an 86.25mm bore, making it a +0.25mm oversize option compared with the factory nominal 86mm bore.
With a quoted 10.5:1 compression ratio and approximately 0.8cc piston crown volume, the W6678M8625AP provides an option for performance engine builders requiring a forged piston capable of operating under demanding conditions.
2618 Forged Aluminium Construction
The Wiseco Professional Series piston is manufactured from 2618 forged aluminium alloy. This material is widely used in demanding performance and motorsport piston applications because of its strength and ability to withstand high cylinder pressures and elevated operating temperatures.
Wiseco combines its forged construction with precision machining to provide the dimensional accuracy required in professionally built performance engines.
86.25mm Oversize Bore
The 86.25mm bore diameter is 0.25mm larger than the nominal 86mm factory 2JZ bore.
This makes the piston suitable for engines being rebuilt or machined to an 86.25mm finished bore.
Always have the cylinder block measured by a professional engine builder before ordering oversize pistons. Final bore and piston-to-wall clearance should be established using the actual pistons supplied and Wiseco’s recommended specifications.
ArmorGlide Skirt Coating
The piston incorporates Wiseco’s ArmorGlide skirt coating, designed to help reduce friction and improve resistance to skirt scuffing and seizure.
This coating is particularly beneficial in performance engines where the pistons may experience greater thermal and mechanical loading than in a standard road engine.
Precision-Machined Crown and Ring Grooves
The W6678M8625AP features a fully machined piston crown together with precision ring grooves and additional sealing features.
The design includes:
- Precision-machined piston crown
- Precision ring grooves
- Anti-detonation groove
- Ring-sealing enhancement features
- Forced wrist-pin oiling
These features make the piston suitable for serious performance-oriented 2JZ-GTE engine builds.
Floating Wrist Pin
The piston uses a floating wrist-pin arrangement and includes a high-strength 52100 steel wrist pin.
The pin diameter is approximately 0.866 inch / 22mm.
Piston Rings Included
Wiseco specifies a compatible ring set with this piston.
Ring dimensions include:
- Top compression ring: 1.0mm
- Second compression ring: 1.2mm
- Oil ring: 2.8mm
Always check ring end gaps during engine assembly and set them according to the intended engine power level, boost pressure, fuel and Wiseco or engine-builder recommendations.
Designed for Performance 2JZ-GTE Builds
The Toyota 2JZ-GTE remains one of the most popular engines for high-performance Supra builds thanks to its robust architecture and exceptional tuning potential.
A forged piston upgrade can form part of an engine build involving:
- Performance street engines
- Turbocharged builds
- Competition engines
- Track cars
- Drag racing applications
- High-output engine rebuilds
- Fully forged 2JZ-GTE builds
The correct compression ratio, piston clearance, fuelling, ignition timing and turbocharger specification should always be considered as part of the complete engine combination.
Toyota Supra 2JZ-GTE Application
This piston is intended for the Toyota 2JZ-GTE 3.0L 24V six-cylinder engine, commonly associated with the Toyota Supra Mk4 / A80 Turbo.
Fitment should be confirmed using engine code, bore diameter and engine-build specifications rather than vehicle registration alone, particularly where vehicles have undergone engine swaps or internal modifications.
Why Choose Wiseco Pistons?
Wiseco has extensive experience manufacturing forged engine components for performance, racing and motorsport applications.
The Professional Series combines:
- 2618 forged aluminium construction
- Precision machining
- ArmorGlide skirt coating
- Fully machined piston crown
- Precision ring grooves
- Forced wrist-pin oiling
- Floating wrist-pin design
- Performance-oriented piston architecture
For builders upgrading a Toyota 2JZ-GTE engine, the Wiseco W6678M8625AP 86.25mm forged piston provides a high-quality individual replacement or engine-building component.
Important Installation Information
This product is supplied as ONE individual piston.
A Toyota 2JZ-GTE six-cylinder engine requires six pistons for a complete engine build.
Because this is an 86.25mm oversize piston, professional cylinder measurement and machining may be required.
Do not machine the engine block based solely on the nominal piston size. Your engine builder should measure the actual pistons and establish the final bore clearance according to Wiseco specifications and the intended engine application.
Compression ratio may also vary depending on cylinder-head volume, head-gasket thickness, deck height and other engine-build specifications.
Product Specifications
Brand: Wiseco
Product Series: Professional Series
Product Type: Forged Engine Piston
Manufacturer Part Number: 6678M8625AP
Website SKU: W6678M8625AP
Engine: Toyota 2JZ-GTE
Engine Capacity: 3.0L
Configuration: Inline 6, 24 Valve
Bore Diameter: 86.25mm
Oversize: +0.25mm
Compression Ratio: 10.5:1 quoted application
Piston Crown Volume: Approx. 0.8cc
Compression Height: 33.99mm
Piston Material: 2618 Forged Aluminium
Skirt Coating: ArmorGlide
Forging Type: Strutted
Wrist Pin: Included
Wrist Pin Type: Floating
Wrist Pin Diameter: 0.866in / approx. 22mm
Wrist Pin Material: 52100 Steel
Ring Set: Included
Top Ring: 1.0mm
Second Ring: 1.2mm
Oil Ring: 2.8mm
Quantity: 1 Piston
GTIN / UPC: 00193564175755
Vehicle Application
Toyota Supra Mk4 / A80
Engine: 2JZ-GTE 3.0L Twin Turbo
Typical application period: 1993–1998 for the published Wiseco application.
Vehicle and engine specifications can vary by market and modification history. Confirm the 2JZ-GTE engine code and required 86.25mm finished bore before ordering.
FAQ
Is W6678M8625AP a complete set of six pistons?
No. W6678M8625AP is an individual Wiseco forged piston. Six pistons would normally be required for a complete 2JZ-GTE engine.
What bore size is the Wiseco W6678M8625AP?
The piston has an 86.25mm bore specification, which is approximately +0.25mm oversize compared with the nominal 86mm 2JZ-GTE bore.
What engine does this piston fit?
It is designed for the Toyota 2JZ-GTE 3.0L 24-valve inline-six engine.
What is the compression ratio?
The published application specifies approximately 10.5:1. Actual assembled compression ratio can vary depending on the cylinder head, head gasket, deck height and other engine specifications.
Are piston rings included?
Yes. Wiseco lists a piston ring set as included with this individual piston.
Is the wrist pin included?
Yes. A floating high-strength wrist pin is included.
Does my block need machining?
Because this is an 86.25mm oversize piston, block machining may be necessary. The cylinder bores should be inspected and measured by a professional engine builder before machining.
