polished connecting rods

onebun · Post by **onebun** » Fri Oct 30, 2009 6:06 pm

guys i noticed when i was rebuilding my engine that the connecting rods on the vmax were highly polished (same as the srx 440) i have owned many yamaha 2 strokes(banshee,rz350/500,yz's) and have not seen this just wondering if there is a purpose to this?anyone know?

Bob Vehring · Post by **Bob Vehring** » Fri Oct 30, 2009 10:25 pm

Polishing the rod was done to help prevent stress risers in the material. How important this is, is relavent to how close to the limit of the strength of your rod your at. Most sleds have pretty strong rods. Its more of an issue when dealing with very heavy pistons.
It is also common in 4 cy race engines to help shed oil and get it back down in the sump

jefflanthier · Post by **jefflanthier** » Sat Oct 31, 2009 9:01 am

You may have a rebuilt crank hard to say .

vmax-540 · Post by **vmax-540** » Sun Nov 01, 2009 10:51 pm

The Vmax had polished rods from the factory, what Bob said is true ,it was done to help prevent stress cracks from forming.