| PORSCHE 911
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.
Includes:
Pin fitting and wire locks
9310 high carbon alloy, tapered wall wrist pins
Rings are OEM style & material, (sold separately)
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PORSCHE 911 2.7L
Std Bore: 90mm
Ring package designed for: 1.0, 1.2, 2.8mm |
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| 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 |
 |
| 261663 |
2.7 |
90mm |
70.4 |
127.8 |
34mm |
9.5 |
21.8 |
404 |
STD |
866-2500-15-93C |
JG1006-3543 |
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| 261664 |
2.7 |
90mm |
70.4 |
127.8 |
34mm |
10.5 |
27.3 |
419 |
STD |
866-2500-15-93C |
JG1006-3543 |
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| 261665 |
2.7 |
92mm |
70.4 |
127.8 |
34mm |
9.5 |
19.7 |
403 |
2mm |
866-2500-15-93C |
JG1006-3622 |
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| 261666 |
2.7 |
92mm |
70.4 |
127.8 |
34mm |
10.5 |
25.5 |
418 |
2mm |
866-2500-15-93C |
JG1006-3622 |
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PORSCHE 911 3.0L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM |
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| 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 |
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| 274048 |
3.0 |
95mm |
70.4 |
127.8 |
34mm |
9.5 |
38.5 |
450 |
STD |
866-2500-15-93C |
J650U6-3740 |
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| 274049 |
3.0 |
95mm |
70.4 |
127.8 |
34mm |
10.5 |
44.7 |
472 |
STD |
866-2500-15-93C |
J650U6-3740 |
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PORSCHE 911 3.0L
Std Bore: 95mm
Ring package designed for: 1.5, 1.5, 3.0MM |
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| 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 |
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| 274638 |
3.2 |
98mm |
70.4 |
127.8 |
34mm |
9.5 |
35.2 |
477 |
3mm |
866-2500-15-93C |
J612U6-3858 |
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| 274051 |
3.2 |
98mm |
70.4 |
127.8 |
34mm |
10.5 |
41.8 |
482 |
3mm |
866-2500-15-93C |
J612U6-3858 |
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PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM |
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| 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 |
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| 274640 |
3.2 |
95mm |
74.4 |
127 |
32.8mm |
9.5 |
35.1 |
445 |
STD |
905-2500-15-52C |
J650U6-3740 |
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| 274639 |
3.2 |
95mm |
74.4 |
127 |
32.8mm |
10.5 |
41.7 |
450 |
STD |
905-2500-15-52C |
J650U6-3740 |
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| 274644 |
3.2 |
95mm |
74.4 |
127 |
32.8mm |
11.5 |
47.0 |
464 |
STD |
905-2500-15-52C |
J650U6-3740 |
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PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.5, 3.0MM |
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| 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 |
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| 274642 |
3.4 |
98mm |
74.4 |
127 |
32.8mm |
9.5 |
31.6 |
470 |
3mm |
905-2500-15-52C |
J612U6-3858 |
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| 274645 |
3.4 |
98mm |
74.4 |
127 |
32.8mm |
10.5 |
38.6 |
466 |
3mm |
905-2500-15-52C |
J612U6-3858 |
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| 274646 |
3.4 |
98mm |
74.4 |
127 |
32.8mm |
11.5 |
44.2 |
477 |
3mm |
905-2500-15-52C |
J612U6-3858 |
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PORSCHE 911 3.2L
Std Bore: 95mm
Ring package designed for: 1.5, 1.75, 3.5MM |
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| 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 |
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| 274643 |
3.5 |
100mm |
74.4 |
127 |
32.8mm |
10.5 |
36.5 |
491 |
5mm |
905-2500-15-52C |
J660U6-3937 |
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| 274647 |
3.5 |
100mm |
74.4 |
127 |
32.8mm |
11.5 |
42.3 |
496 |
5mm |
905-2500-15-52C |
J660U6-3937 |
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PORSCHE 911 3.3L TURBO
Std Bore: 97mm
Ring package designed for: 1.5, 1.75, 3.0mm |
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| 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 |
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| 274648 |
3.4 |
98mm |
74.4 |
127 |
32.8mm |
8.0 |
17.5 |
439 |
1mm |
905-2500-18-52C |
J612U6-3858 |
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| 274649 |
3.4 |
98mm |
74.4 |
127 |
32.8mm |
8.5 |
22.8 |
441 |
1mm |
905-2500-18-52C |
J612U6-3858 |
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PORSCHE 911 3.6L
Std Bore: 100mm
Ring package designed for: 1.5, 1.75, 3.0MM |
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| 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 |
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| 274637 |
3.6 |
100mm |
76.4 |
127 |
31.8mm |
11.5 |
40.8 |
482 |
STD |
905-2500-15-52C |
J660U6-3937 |
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| 274636 |
3.8 |
100mm |
76.4 |
127 |
31.8mm |
12.5 |
45.8 |
494 |
STD |
905-2500-15-52C |
J660U6-3937 |
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| 274045 |
3.8 |
102mm |
76.4 |
127 |
31.8mm |
11.5 |
38.8 |
494 |
2mm |
905-2500-15-52C |
J660U6-4016 |
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| 212445 |
3.6 |
102mm |
76.4 |
127 |
31.8mm |
12.5 |
44.0 |
506 |
2mm |
905-2500-15-52C |
J660U6-4016 |
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- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.
Tech and Installation Tips