Gas porting pistons at top ring?

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Has nothing to do with seating the rings quickly, its for running low tension rings to reduce drag, and the gas ports pressurize the top ring, forcing it to seal for the compression stroke.
And yes, it is still done.
 
I saw a small mention of these in Andy Finkbeiners book on Big Block engines. Seems like a cool idea until the holes get carboned over. Maybe not a great long term idea for a street car though.
 
Frankenduster said:
I saw a small mention of these in Andy Finkbeiners book on Big Block engines. Seems like a cool idea until the holes get carboned over. Maybe not a great long term idea for a street car though.
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if your running water or meth injection they never will...
 
TrailBeast said:
It will also wear the ring out faster.
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So lets clarify this statement vs just throwing it our there as blanket fact.

Race motors use vertical gas ports, not your daily driver 200hp weezer.
Many aftermarket pistons come with lateral gas ports now instead that function very similar.
Race engines make what, 2x-3x the stock power on average. Your now asking a lot out of that ring, to seal all that extra heat and force in. Your also talking a ring that is less than .060" thick, not the monster .078" stock rings.
The upside is that the rings will wear faster, but less wear on the cylinder wall itself.
Reduced surface area means less drag, but also less area to break down and wear out.

So, yes they do wear out faster, but for good reason.;-)
 
Rings are a place to really make some power although it is almost always with the consequence of much less service life.
CPs dead on. The Dykes ring is also used, and most successful guys will pair the ported pistons with vacuum pumps.
There is absolutely no reason to carry the weight or add the complication of a water or meth injection system on a race car. These are race engines. Not street engines. Not endurance engines. They burn race-type fuels and have a very short expected life.
 
805moparkid said:
the water or gas ports?
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Sorry, I didn't see this till now.
The added pressure of the compression being allowed behind the ring wears the top ring out faster.



CPMotorworks said:
So lets clarify this statement vs just throwing it our there as blanket fact.

Race motors use vertical gas ports, not your daily driver 200hp weezer.
Many aftermarket pistons come with lateral gas ports now instead that function very similar.
Race engines make what, 2x-3x the stock power on average. Your now asking a lot out of that ring, to seal all that extra heat and force in. Your also talking a ring that is less than .060" thick, not the monster .078" stock rings.
The upside is that the rings will wear faster, but less wear on the cylinder wall itself.
Reduced surface area means less drag, but also less area to break down and wear out.

So, yes they do wear out faster, but for good reason.;-)
Click to expand...

Yep that's why they did it, was to gain that little extra ring seal to keep more compression in the cylinder.
 
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