PRE-RELEASE
Pistons
| Pistons |
| General data |
| Engine | B207E/B207L/B207R | |
| Compression ratio | 9.5:1 | |
| Nominal compression (bar) | 14.5 | |
| Min. compression (bar) | 12.4 | |
| Piston play nominal (mm) | 0.013 - 0.047 | |
| Piston speed at 5000 rpm (m/s) | 15.8 | |
| Important | ||
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Pistons of different makes must not be used in the same engine. The piston make is cast onto the piston. |
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| Piston types |
| Engine | R | Ø | A | H | B | d1 | H d1 | ||
| B207E/B207L/B207R | mm | 30 | 85.961 - 85.979 | 5.36 | 53.00 | 5.6 | 49.13 | 55.36 | |
Pistons
| Piston class and cylinder travel |
The pistons for B207E/B207L/B207R only have one class
The cylinders in B207E/B207L/B207R only have one class
| Piston rings |
| B207E/B207L | Upper compression ring | Lower compression ring | Oil scraper ring | ||||||
| Thickness | mm | 1.170 - 1.190 | 1.475 - 1.490 | 2.38 - 2.46 | |||||
| Play in groove | mm | 0.04 - 0.08 | 0.020 - 0.055 | 0.050 - 0.150 | |||||
| Cylinder gap | mm | 0.15 - 0.35 | 0.400 - 0.600 | 0.25 - 0.75 | |||||
| B207R | |||||||||
| Thickness | mm | 1.170 - 1.195 | 1.470 - 1.495 | 2.38 - 2.46 | |||||
| Play in groove | mm | 0.035 - 0.08 | 0.015 - 0.060 | 0.050 - 0.150 | |||||
| Cylinder gap | mm | 0.15 - 0.35 | 0.400 - 0.600 | 0.25 - 0.75 |
| Piston pin |
| Diameter | mm | 22.995 - 23.000 |
| Play, piston pin-bearing vertical (oval hole) | mm | 0.004 - 0.015 |
| Play, piston pin-bearing horizontal (oval hole) | mm | 0.034 - 0.065 |
| Play, piston pin-connecting rod | mm | 0.012 - 0.022 |
| Length | mm | 63 |
