Piston weight question

[sangheraent]

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?

 

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[trickedcarbine]

Cast or forged?

[registered user]

using heavy pistons doesnt make sense as it puts extra stress on the conrod . particularly at the small end.

[sangheraent]

The lighter pistons are forged wiescos, heavier cast prox. Both are 65mm

 

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[Bennett131]

Ever tried WSM?

[Scrubby]

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")

[J-Madd]

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.

[JTmachining]

Light pistons are good

[sheerider11]

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.

[kawa110]

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