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PORSCHE 911 (Automotive Section)

Designed for air-cooled 911 engines with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined for OEM style rings. (Except 2.7L)

Includes:
Pin fitting and wire locks
9310 high carbon alloy or tool steel wrist pins
Rings are OEM style & material, except 2.7L (sold separately)
PORSCHE 911 2.7L
Std Bore: 90mm
Ring package designed for: 1.0, 1.2, 2.8mm

Tech and Installation Tips
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
261665 2.8 92mm 70.400 127.800 34.000 9.5 19.7 403 2mm 866-2500-15-93C JG1006-3622
261663 2.7 90mm 70.400 127.800 34.000 9.5 21.8 404 STD 866-2500-15-93C JG1006-3543
261666 2.8 92mm 70.400 127.800 34.000 10.5 25.5 418 2mm 866-2500-15-93C JG1006-3622
261664 2.7 90mm 70.400 127.800 34.000 10.5 27.3 419 STD 866-2500-15-93C JG1006-3543


PORSCHE 911 3.0L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274048 3 95mm 70.400 127.800 34.000 9.5 38.5 450 STD 866-2500-15-93C J650U6-3740
274049 3 95mm 70.400 127.800 34.000 10.5 44.7 472 STD 866-2500-15-93C J650U6-3740


PORSCHE 911 3.0L
Std Bore: 95mm
Ring package designed for: 1.5, 1.5, 3.0MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274638 3.2 98mm 70.400 127.800 34.000 9.5 35.2 477 3mm 866-2500-15-93C J612U6-3858
274051 3.2 98mm 70.400 127.800 34.000 10.5 41.8 482 3mm 866-2500-15-93C J612U6-3858


PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274640 3.2 95mm 74.400 127.000 32.800 9.5 35.1 445 STD 905-2500-15-52C J650U6-3740
274639 3.2 95mm 74.400 127.000 32.800 10.5 41.7 450 STD 905-2500-15-52C J650U6-3740
274644 3.2 95mm 74.400 127.000 32.800 11.5 47.0 464 STD 905-2500-15-52C J650U6-3740


PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.5, 3.0MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274642 3.4 98mm 74.400 127.000 32.800 9.5 31.6 470 3mm 905-2500-15-52C J612U6-3858
274645 3.4 98mm 74.400 127.000 32.800 10.5 38.6 466 3mm 905-2500-15-52C J612U6-3858
274646 3.4 98mm 74.400 127.000 32.800 11.5 44.2 477 3mm 905-2500-15-52C J612U6-3858


PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274643 3.5 100mm 74.400 127.000 32.800 10.5 36.5 491 5mm 905-2500-15-52C J660U6-3937
274647 3.5 100mm 74.400 127.000 32.800 11.5 42.3 496 5mm 905-2500-15-52C J660U6-3937


PORSCHE 911 3.3L TURBO
Std Bore: 97mm
Ring package designed for: 1.5, 1.75, 3.0mm
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
331158 3.4 97mm 74.400 127.000 32.800 8.0 17.5 356 STD 905-2500-18-93C JG1006-3819
274648 3.4 98mm 74.400 127.000 32.800 8.0 17.5 439 1mm 905-2500-18-93C J612U6-3858
274649 3.4 98mm 74.400 127.000 32.800 8.5 22.8 441 1mm 905-2500-18-93C J612U6-3858
331159 3.4 97mm 74.400 127.000 32.800 8.5 22.8 440 STD 905-2500-18-93C JG1006-3819


PORSCHE 911 3.6L
Std Bore: 100mm Ring package designed for: 1.5, 1.75, 3.0MM
Part # Engine
Size
Bore
Size
Stroke Rod
Length
Compression
Distance
Compression
Ratio
Dome
Volume
Gram
Weight
Oversize Wrist Pin
Part Number
Ring Set
Part Number
274046 3.8 102mm 76.400 127.000 31.800 11.5 38.8 494 2mm 905-2500-15-52C J660U6-4016
274637 3.6 100mm 76.400 127.000 31.800 11.5 40.8 482 STD 905-2500-15-52C J660U6-3937
274045 3.8 102mm 76.400 127.000 31.800 12.5 44.0 506 2mm 905-2500-15-52C J660U6-4016
274636 3.6 100mm 76.400 127.000 31.800 12.5 45.8 494 STD 905-2500-15-52C J660U6-3937

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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