closed chamber vs open chamber

4spdragtop said

Thanks Rob!! That explains it! Im a visual/hands-on learner, so that helps huge. So now for another question if I can??

I have heard "quench" a heckuva lot on here. What does that mean?

Im sure there will be more questions, and this seemed like the perfect thread to ask. Hope more then just me are learning something.

Oooh I hit yer "spanks" button too :prayer:

Click to expand...

Ok let's see if this helps. In the pic, look at the red X. That is the quench area. You cannot have that with an open chamber head......without a specially made quench dome piston. Essentially a piston with a dome on the "wrong" side if you will, unlike the piston in the pic. By making quench distance small (between .035 and .045") this does lots of stuff. It creates turbulence and that makes for a more complete burn and results in lower combustion temps. Which in turn allows more compression on pump gas VS the same engine without quench.