ALright... 3, 5, 10 grams difference. Take a big.....well do your stuff before the race and you can save more then that [img]i/expressions/face-icon-small-wink.gif[/img]

Sorry to the builders, but just could not resist [img]i/expressions/face-icon-small-smile.gif[/img]

 

I have been coaxed into doing some thinking about this piston weight thing by a friend of mine. That little bit of weight difference is a big deal.

Think about how much your car weighs. Think about how much force it hits with when it crashes into a wall at high speed. Your piston comes to a complete stop at TDC and at WTAFTBOTT (Whatever The Acronym For The Bottom Of The Throw) then goes back the other direction at 180 degrees. At a high enough rpm that extra gram could be pounds of force. I would venture to say that based on the piston's distance and relation to the crank axis, no other part of the bike will make as much difference per gram as lightening the piston.

Ron

 

I hear ya Dragon, it is of no consequence to me either.

But regardless of the impact the weight difference may have, I find it odd that a particular vendor or salesman may use the phrase "unlike the other boat anchors, our piston....blah blah blah....", when I've yet to see any of these so called boat anchors surface. I would just like to know who makes the boat anchors, so I know what to stay away from, I'm riding a quad not a waverunner so I have no need for aquatic devices. I'm not saying that there aren't any boat anchors out there, just wanna know which ones they are.

 

Actually I have never seen a boat anchor surface either.............. I think everyone should care about the effect piston weight has on performance. Every gram removed helps the motor rev that much quicker. On a given torque curve if the motor is able to reach peak power in less time, you will be that much farther down the track when it is time to shift.

Everybody on this forum seems to be interested in increasing performance. Why not do it with your piston weight as well?

Ron

 

DSnut, you present an interesting point in the changing directions. It would be interesting if there is someone out there with one of those wonderful equations that could prove it. I was being serious/funny, in I would not think that small amount could do anything major. Anyone out there got the math side to prove different?

 

I know where you were coming from and it was funny.[img]i/expressions/face-icon-small-happy.gif[/img]

Ron

 

I'm gonna make a wild guess and say the connecting rod thinks the piston weigh's over 1000lbs at 8000rpm. The g force has to be tremendous. So yes 3 grams makes a difference.

I have a couple more pistons to weigh and I'll list them all at once after FSW. Hightower after your typo correction you are real close to my numbers on the stock piston and the Pami stock bore.

 

That is amazing! So that 3 grams is over 100 lbs of difference at 8k............Wow.

Ron

 

just trying to be nice and not name any names...
222

 

according to MrHP's latest post, no piston to date has been made heavier than the stocker, so I guess it turns out that there are no boat anchors afterall. the closest piston that "more closely matches the balance of the stock piston" is the first generation RWR piston. [img]i/expressions/face-icon-small-tongue.gif[/img]