speedy sie Posted December 31, 2011 Report Share Posted December 31, 2011 thoughts on polished rods.... balanced the rods and pistons on the zx7r..and have been looking at polished rods...any ideas...any done this?? Link to comment Share on other sites More sharing options...
speedy sie Posted December 31, 2011 Author Report Share Posted December 31, 2011 blood sweat and yep spit and polish...as in by hand... Link to comment Share on other sites More sharing options...
Superdunc Posted December 31, 2011 Report Share Posted December 31, 2011 Getting them shot peened would be of more benifit, polishing by hand not worth it imho. Better quality rod bolts would be my forst priority. Link to comment Share on other sites More sharing options...
speedy sie Posted December 31, 2011 Author Report Share Posted December 31, 2011 ok chaps only an idea. Link to comment Share on other sites More sharing options...
Mrdrink Posted January 4, 2012 Report Share Posted January 4, 2012 I have a box of odd kit polished rods in the garage. someone had been busy. my ZXR has polished rods. Apart from head work most of other engine work isnt worth it on its own but part of a full package it adds up. Depends on what you from the engine. If its something over 130hp then get polishing. if you're doing it for the sake of it, dont bother. Link to comment Share on other sites More sharing options...
Liamo Posted January 5, 2012 Report Share Posted January 5, 2012 What are the benifits of polishing the rods? Link to comment Share on other sites More sharing options...
RonniB Posted January 5, 2012 Report Share Posted January 5, 2012 You strengthen them. But don't do it to Ti rods as they have a low friction coating on the big ends to avoid gauling. Link to comment Share on other sites More sharing options...
Liamo Posted January 5, 2012 Report Share Posted January 5, 2012 I'm pretty sure polishing does nothing of the sort. Cold working the metal by peening will strengthen them. Polishing reduces windage losses. Is that wind-age (as in the blowing thing the air does, rhymes with pinned) or is it wind-age (the thing you do with a watch, or fontyyy, rhymes with mind) Link to comment Share on other sites More sharing options...
marcaztls Posted January 5, 2012 Report Share Posted January 5, 2012 The first one. It's the air resistance of a moving part. Link to comment Share on other sites More sharing options...
RonniB Posted January 5, 2012 Report Share Posted January 5, 2012 Well by making a surface more uniform you remove potential stress-risers, so you strengthen them or, my bad, correctly make the material live up to it's theoretic strength. That's the original application for polishing conrods and , back in the old times, pushrods. The windage gains is a byproduct of this application and due to modern manufacturing surfaces it's less relevant compared to the higher strength gain you get from shotpeening. Ronni Link to comment Share on other sites More sharing options...
Boozybloke Posted January 5, 2012 Report Share Posted January 5, 2012 I polished my rod last night. HTH Link to comment Share on other sites More sharing options...
2moto Posted January 5, 2012 Report Share Posted January 5, 2012 Well by making a surface more uniform you remove potential stress-risers, so you strengthen them or, my bad, correctly make the material live up to it's theoretic strength. That's the original application for polishing conrods and , back in the old times, pushrods. The windage gains is a byproduct of this application and due to modern manufacturing surfaces it's less relevant compared to the higher strength gain you get from shotpeening. Ronni Yes, agree with that. Ideally, you polish them first (actually mainly along the vertical front and rear edge, and over the small end where most of the stress occurs) and then shot peen the polished surfaces. An example: Link to comment Share on other sites More sharing options...
Superdunc Posted January 5, 2012 Report Share Posted January 5, 2012 I polished my rod last night. HTH Did Speedie Sie do it for you? Link to comment Share on other sites More sharing options...
speedy sie Posted January 5, 2012 Author Report Share Posted January 5, 2012 come on chaps evry man has a time in his life when the old rod is polished!!! just thought it would relieve the cast stress...as in on the old rod.... Link to comment Share on other sites More sharing options...
Boozybloke Posted January 5, 2012 Report Share Posted January 5, 2012 Did Speedie Sie do it for you? No, I polished it myself Link to comment Share on other sites More sharing options...
bigkev Posted January 5, 2012 Report Share Posted January 5, 2012 No, I polished it myself Yes but did it help you in the wind-age department? Link to comment Share on other sites More sharing options...
Boozybloke Posted January 5, 2012 Report Share Posted January 5, 2012 Yes but did it help you in the wind-age department? Not sure, but I was gasping a bit afterwards if that helps? Link to comment Share on other sites More sharing options...
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