Quote:

Quench is still important with dished piston design, and the area outside of the dish needs to be as large as 50% of the total crown area for optimum quench.

1994 Magnum 5.9V8 factory pistons are over 40% quench area.

The small details in the design of the edge of the dish are important too.

If the edge is designed right,
the straight line inward moving fan jets of "squished out" air and fuel
then 'tumbles' as it goes over the edge of the dish and downward.

Diesel pistons in particular make use of this tumbling turbulence in addition to the squish turbulence.



Ok, I jacked this pic from source, it was easy to find. Is this a good ballpark of the shape I should be looking for? are flat top slugs better overall? would I have hotspots with this piston? looking for 10.5-11.0 compression.

The red lines show how I believe the mixture would "tumble" off the dome and into the lands on the opposite side of the piston when squeezed from the quench area, is this ballpark/kinda along the lines??

Bare with me on this learning curve guys, Thanks.

5579205-platinumdish.jpg (117 downloads)