Hi Guys. Hope this information helps all concerned.
thank you for your e-mail.
I guess you mean the groove in the split line – cap side.
This groove was made in the earlier days before we manufactured serrations in the split line.
The groove more or less has the following reason:
For connecting rods, especially on high revs, we machined this groove in order to increase the surface pressure in the split line.
Of course the surface pressure increases, when the surface gets smaller.
Therefore we protect the conrod from gapping in the split line.
Today, on newer rods we basically do not make this anymore, because we now are machining serrations.
Hope this helps.
Technical Sales Racing
Pankl Engine Systems GmbH & Co KG
A member of Pankl Racing Systems
A- 8600 Bruck an der Mur
phone: +43 (0) 3862 51 250 206
mobile: +43 (0) 664 821 9984
fax: +43 (0) 3862 51 250 290
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