A program can be downloaded from http://www.myvirtualnetwork.com/mklotz/ (CROD.ZIP) that can be used to calculate piston position or http://www.torqsoft.net/piston-position.html online. Below are the relevant settings for H1, H2, & S series.
An MSExcel Spreadsheet to calculate piston position can be downloaded here.
| H1 | H2 | S3 | ||||||||
| Rod Length = | 110mm | Rod Length = | 120mm | Rod Length = | 100mm | |||||
| Crank Throw = | 29.4mm | Crank Throw = | 31.5mm | Crank Throw = | 26.15mm | |||||
| Stroke = | 58.8mm | Stroke = | 63.0mm | Stroke = | 52.3mm | |||||
| BTDC mm |
Angle | BTDC in |
BTDC mm |
Angle | BTDC in |
BTDC mm |
Angle | BTDC in |
||
| 2.234 | 20.0 | 0.088 | 2.384 | 20.0 | 0.094 | 1.978 | 20.0 | 0.078 | ||
| 2.345 | 20.5 | 0.092 | 2.503 | 20.5 | 0.099 | 2.076 | 20.5 | 0.082 | ||
| 2.458 | 21.0 | 0.097 | 2.624 | 21.0 | 0.103 | 2.177 | 21.0 | 0.086 | ||
| 2.575 | 21.5 | 0.101 | 2.748 | 21.5 | 0.108 | 2.280 | 21.5 | 0.090 | ||
| 2.694 | 22.0 | 0.106 | 2.875 | 22.0 | 0.113 | 2.385 | 22.0 | 0.094 | ||
| 2.815 | 22.5 | 0.111 | 3.005 | 22.5 | 0.118 | 2.493 | 22.5 | 0.098 | ||
| 2.939 | 23.0 | 0.116 | 3.137 | 23.0 | 0.124 | 2.602 | 23.0 | 0.102 | ||
| 3.065 | 23.5 | 0.121 | 3.272 | 23.5 | 0.129 | 2.714 | 23.5 | 0.107 | ||
| 3.194 | 24.0 | 0.126 | 3.409 | 24.0 | 0.134 | 2.828 | 24.0 | 0.111 | ||
| 3.325 | 24.5 | 0.131 | 3.549 | 24.5 | 0.140 | 2.944 | 24.5 | 0.116 | ||
| 3.459 | 25.0 | 0.136 | 3.692 | 25.0 | 0.145 | 3.063 | 25.0 | 0.121 | ||
| 3.595 | 25.5 | 0.142 | 3.837 | 25.5 | 0.151 | 3.183 | 25.5 | 0.125 | ||
| 3.733 | 26.0 | 0.147 | 3.985 | 26.0 | 0.157 | 3.306 | 26.0 | 0.130 | ||
| 3.874 | 26.5 | 0.153 | 4.136 | 26.5 | 0.163 | 3.431 | 26.5 | 0.135 | ||
| 4.017 | 27.0 | 0.158 | 4.288 | 27.0 | 0.169 | 3.557 | 27.0 | 0.140 | ||