Garage Storage Organization and Garage Cabinets

V8Compact · **Custom pistons?**

I was wondering if any of the TD vendors carrying pistons have those with radial gas ports? I would think this would be a nice addition(sp?) to some applications that need extra sealing power. I know some racing engines have them, but I dunno if they are made for street motors...

**mopar2ya** · 05-01-2006, 12:34 AM

Every aftermarket piston Ive seen has them. I assume your referring to the holes in the bottom ringland?

V8Compact · 05-02-2006, 08:37 AM

Actually, I believe they are on the top ring land... as the gases would push on the compression ring. I think those holes are oil drainback/drainage holes or something like it. I believe it works about the same way... I was talking to a friend about that. I know most don't carry pistons with verticle gas ports, as those get clogged pretty easily.

**mopar2ya** · 05-02-2006, 11:05 PM

Cant have degassing ports on the top ring as compression would simply blow by, and oil isnt supposed to get up that high so its not for oil.

V8Compact · 05-03-2006, 09:46 AM

Hm... well, I guess it's not that big of a deal. I don't THAT much about cars, so I'll just go with what you say...

Shel-Game · 05-03-2006, 10:22 AM

We use gas ported piston on V8 race engines all the time. I don't know if it would work the same on a turbo engine, though. The cylinder pressures are likely higher due to boost.

Gas porting allows a lower top ring tension (ie - lower friction), but the gas ports allow the combustion pressure to push the ring out when sealing is needed.

**mopar2ya** · 05-03-2006, 05:53 PM

I chatted with my engine builder today on them and he is running some on a 6.7 second drag car, he says they have about 13-15% leakdown, but for what hes doing he needs the gas ports. He rattle a bunch of other things, ring flutter and so on, but said for most applications you dont need/want them.

V8Compact · 05-27-2006, 01:06 PM

I've heard a LOT of conflicting viewpoints on gas ports. Gas ports shouldn't contribute to blow-by, and the extra sealing power under pressure would reduce oil consumption. The only thing I could see is the ports getting clogged leading to more leakage with the lower tension vs. just having a higher static tension...

I think somebody makes those for their forged pistons, anyways.

glhs636 · 05-27-2006, 03:30 PM

Wiseco can gass port pistons
I was going to have that done to mine years ago
but the omni was still highly street driven back then
Didn't think I needed it on a low 12 sec street driven omni