I know you go back and forth between dome displacement to change compression, but Arias makes pistons that are dished, but have a higher stroke to keep the compression up.

Is there an advantage to going with a larger dome, or a dish other than valve clearance?

 

Also, is a lighter piston better than a heavier, cant they rev up faster?

 

lighter pistons can be better for all motor. But for higher hp Boosted cars, you need a thicker piston because it phyically gets hotter. And a thicker piston will dissapate the heat better.

you cannot change the stroke with a piston, only compression ratio

the different dish/domes mainly change the compression ratio AND how the flame front acts on the piston.

 

I guess its not really the stroke that changes, but maybe the wrist pin position is moved up or down.

 

you gonna change the "quich"(sp) area also.

is it shirtless

 

dished pistons give better swirl... and they allow the combustion to exact it's pressure a little more evenly than domed pistons. Theoretically extending bearing life.

 

cool, thanks for a little info.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by X2BOARD &raquo;</TD></TR><TR><TD CLASS="quote">dished pistons give better swirl... and they allow the combustion to exact it's pressure a little more evenly than domed pistons. Theoretically extending bearing life.</TD></TR></TABLE>

Also by having better swirl, you get more complete combustion which increases the life of your headgasket and valves. But also, higher compression gives you more complete combustion, so dished or flat pistons combined with high compression would be ideal.