CHamber isolation ?

[Keith Mezzina]

On Wed, 15 Mar 2000 13:19:44 -0600, MysticZ
<lt1_z28 at houston-f-body.org> wrote:

>Sounds interesting. Would help control stuff blowing past the rings
>(less pressure differential), but may rob some peak power since it would
>take energy to pressurize the area below the piston. There is one little
>problem, however. The conn rod would need a big hole, probably big
>enough to make the whole thing unworkable.

Actually, you just reminded me of something else.  Ring seal.  You
*have* to have a pressure differential to achieve ring seal.  Both
NASCAR and Drag Racers (I'm one of the latter) go to great efforts to
create crankcase vacuum.  This helps the rings to seal.  Rings don't
seal via spring tension, they seal by having some of the combustion
gasses get behind 'em and push them out towards the cylinder walls.
If you have a vacuum in the crankcase, the differential of pressure is
greater, and the rings get more outward pressure.


- - - - - -
1973 Dodge Challenger (340/727/3.91SG/NOS) 13.01 @ 105 / 12.2 @ 112 (NOS)
1985 Z-28 Backhalf Race car (356/TH400/5.56)
1977 Suburban (Daily Beater)
Homepage: http://www.checkmateracing.com
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