Piston set, Big bore 86mm. Porsche 356A / 356B  ❭  0081186EP

86mm Big Bore Piston Set 

Upgrade or rebuild your Porsche 356 engine with this OE Match 86mm Big Bore Piston Set, designed for Porsche 356A and 356B applications.

Fits:

• Porsche 356A 1955-59
• Porsche 356B 1959-63

with the 3 piece case

Manufactured from graphite coated hypereutectic material, these 86mm pistons provide excellent strength, dimensional stability and wear resistance. The graphite coated skirts help reduce friction, while the 22° piston angle and machined valve pockets provide the correct profile and valve clearance for compatible engine configurations.

Designed for a 1600cc engine with a 74mm stroke, each piston features a 17cc dome, 9.2:1 compression ratio and 22mm wrist pin.

Why Choose Hypereutectic Pistons?

Hypereutectic pistons use a high-silicon aluminium alloy that provides excellent dimensional stability and controlled thermal expansion.

Benefits include:

• Strong, durable construction
• Excellent wear resistance
• Reduced thermal expansion
• Graphite coating to reduce friction
• Consistent piston-to-cylinder clearance
• Ideal for engine rebuilds and restoration projects

When Should Pistons Be Replaced?

Pistons and rings can deteriorate through high mileage, overheating, poor lubrication or general engine wear. Replacement should be considered when:

• Compression is below specification
• Oil consumption has increased
• Pistons or ring grooves are worn
• Piston crowns or skirts are damaged
• The engine is undergoing a complete rebuild

Replacing worn pistons and rings helps restore compression, efficiency and reliable engine performance.

Key Specifications

• Big bore piston diameter: 86mm
• Suitable for Porsche 356A / 356B
• Engine size: 1600cc
• Stroke: 74mm
• Hypereutectic construction
• Graphite coated
• Dome volume: 17cc
• Compression ratio: 9.2:1
• Piston angle: 22°
• 22mm wrist pins
• Machined valve pockets

Kit Includes

• 4 pistons
• Complete set of piston rings
• 4 x 22mm wrist pins
• Wrist pin clips

Porsche 356A / 356B Engine Rebuild Pistons & Components

Correct piston specification is essential when rebuilding a Porsche 356 engine. Piston diameter, stroke, compression ratio, crown angle and wrist pin dimensions must be matched correctly for dependable performance.

This OE Match 0081186EP piston set combines an 86mm big bore design with graphite coated hypereutectic construction, 74mm stroke compatibility, 22° piston angle and 22mm wrist pins, making it an ideal choice for compatible Porsche 356A and 356B engine rebuilds.

Related reference numbers
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0081186EP

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