| Compression
Ratio computed with .010 deck and .038 head gasket at bore +.125"
(weights and compression ratios are approximate) |
| |
|
Compression
Ratio |
|
|
|
| Bore |
Weight |
72cc |
87cc |
Part # |
Ring Set |
|
|
400 - 3.750 Stroke - 6.630
Rod - 1.708 C/H - .980 x 2.750 - 142 Gram Pin |
| 4.150 |
525 |
10.38 |
9.02 |
14473-030 |
315-0032 |
Ring Grooves 1/16 1/16 3/16 |
| |
|
|
|
|
|
Valve Relief Volume 5.5cc |
|
428 - 4.000 Stroke - 6.625
Rod - 1.590 C/H - .980 x 2.750 - 142 Gram Pin |
| 4.125 |
505 |
10.90 |
9.46 |
14474-005 |
315-0032 |
Ring Grooves 1/16 1/16 3/16 |
| 4.150 |
510 |
11.02 |
9.57 |
14474-030 |
|
Valve Relief Volume 5.5cc |
|
455 - 4.210 Stroke - 6.625
Rod - 1.485 C/H - .980 x 2.750 - 142 Gram Pin |
| 4.125 |
510 |
11.62 |
10.08 |
|
|
Ring Grooves 1/16 1/16 3/16 |
| 4.150 |
515 |
11.66 |
10.12 |
14722-030 |
315-0032 |
Valve Relief Volume 5.5cc |
Back To:
PROBE FORGED PISTONS |
