sangheraent Posted June 8, 2016 Report Share Posted June 8, 2016 OK so I was about to order some pistons for my bike and was going to go with the prox pistons like I always do and have been for years never had a problem. But I had a set of wiecos on my bench and I compared the weight I don't have a scale but I used the feeling method it felt like 1 prox piston is almost as heavy as 2 wiescos. How much would this affect power? I'm no motor expert but something tells me heavier piston means more power required to turn it. I doubt it will be a big difference but possible 1-2 hp. Any thoughts? Sent from my STV100-3 using Tapatalk Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 8, 2016 Report Share Posted June 8, 2016 Cast or forged? Quote Link to comment Share on other sites More sharing options...
registered user Posted June 8, 2016 Report Share Posted June 8, 2016 using heavy pistons doesnt make sense as it puts extra stress on the conrod . particularly at the small end. Quote Link to comment Share on other sites More sharing options...
sangheraent Posted June 8, 2016 Author Report Share Posted June 8, 2016 The lighter pistons are forged wiescos, heavier cast prox. Both are 65mm Sent from my STV100-3 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted June 8, 2016 Report Share Posted June 8, 2016 Ever tried WSM? Quote Link to comment Share on other sites More sharing options...
Scrubby Posted June 9, 2016 Report Share Posted June 9, 2016 Wouldn't something like that effect the balance of an engine? I always thought they made pistons to match the crankshaft weight( of the :"lobe") Quote Link to comment Share on other sites More sharing options...
J-Madd Posted June 9, 2016 Report Share Posted June 9, 2016 Wouldn't something like that effect the balance of an engine? I always thought they made pistons to match the crankshaft weight( of the :"lobe")You can have the pistons balanced to the rotating assembly but most people don't bother. 1 Quote Link to comment Share on other sites More sharing options...
JTmachining Posted June 9, 2016 Report Share Posted June 9, 2016 Light pistons are good Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted June 9, 2016 Report Share Posted June 9, 2016 I was always told take a 5 pound weight and punch back and forth. Take a 2 pound weight and punch back and forth. Obviously a little different then a turning motor, but the basics and idea is there. Quote Link to comment Share on other sites More sharing options...
kawa110 Posted June 9, 2016 Report Share Posted June 9, 2016 A Harley that has idle to low puts more stress on bottom end bearings throwing Pistons around without the aid of cumbustion and causes premature wear----same principle Quote Link to comment Share on other sites More sharing options...
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