I have now held a 155 TS 8v piston in my hand, what a difference compared to the 75 part! Much lighter, we're talking at least 100 grams...
![Surprised :o](./images/smilies/icon_surprised.gif)
The design of the piston raised a couple of questions though as the compression height is greater and there is a quite large dome as well, this means that either the rod is shortened quite a lot (bad move) or the crank is further away from the head (highly unlikely).
The crank itself seems to have a longer stroke since the engine is 1995cc compared to 1962 in the "old" TS, or so I've been told. Seems to be correct as all the 155 litterature states 1995 for the 8v TS.
So where does the extra millimeters go? Did they really shorten the rods even more (remember that they shortened it 1mm compared to the Nord already)? Why not move the wrist pin UP instead of down..?
What is the compression ratio on the 155 TS anyway?