Gas ported pistons

[CNC BLOCKS]

On our 2 barrel engines or any of our cirlce track engines we use a 2and napier ring with a low tension oil rings so far its work for my shop.

[900HP]

i believe hendren racing engines did back to back tests with gapless vs standard rings with gas ported pistons and did find a substantial power loss with gapless rings. iirc it was a dirt late model engine.

More than likely that was with gapless 2nd rings, I have not seen any decrease in power using gapless top rings, napier 2nd, and low-tension oil with gas ports vs. JE pro-seal top ring. I have not seen any increase in power on a fresh engine either but my cylinder leakage numbers after 40+ nights of racing are still 2% or less....................hmmmmmmmmmmmmmm...........................

[ijames]

i believe hendren racing engines did back to back tests with gapless vs standard rings with gas ported pistons and did find a substantial power loss with gapless rings. iirc it was a dirt late model engine.

More than likely that was with gapless 2nd rings, I have not seen any decrease in power using gapless top rings, napier 2nd, and low-tension oil with gas ports vs. JE pro-seal top ring. I have not seen any increase in power on a fresh engine either but my cylinder leakage numbers after 40+ nights of racing are still 2% or less....................hmmmmmmmmmmmmmm...........................

I'm a lurker, not an engine builder, but like others I've never heard of more hp from gapless rings. I have heard that leakdown numbers stay better longer, and a friend who runs low 9's on methanol with a turbo v6 says when he went gapless he went from changing the oil every weekend to once or twice a summer due to less water buildup in the oil from blowby.

[stockcar5]

More than likely that was with gapless 2nd rings, I have not seen any decrease in power using gapless top rings, napier 2nd, and low-tension oil with gas ports vs. JE pro-seal top ring. I have not seen any increase in power on a fresh engine either but my cylinder leakage numbers after 40+ nights of racing are still 2% or less....................hmmmmmmmmmmmmmm...........................

you should get that keyboard looked at..your "m" button is sticking.

[900HP]

ha ha ha ha

[MadBill]

i believe hendren racing engines did back to back tests with gapless vs standard rings with gas ported pistons and did find a substantial power loss with gapless rings. iirc it was a dirt late model engine.

More than likely that was with gapless 2nd rings, I have not seen any decrease in power using gapless top rings, napier 2nd, and low-tension oil with gas ports vs. JE pro-seal top ring. I have not seen any increase in power on a fresh engine either but my cylinder leakage numbers after 40+ nights of racing are still 2% or less....................hmmmmmmmmmmmmmm...........................

I'm a lurker, not an engine builder, but like others I've never heard of more hp from gapless rings. I have heard that leakdown numbers stay better longer, and a friend who runs low 9's on methanol with a turbo v6 says when he went gapless he went from changing the oil every weekend to once or twice a summer due to less water buildup in the oil from blowby.

If there's less blowby but no more power, the gapless combo must result in more friction...

[ijames]

[quote="MadBill]If there's less blowby but no more power, the gapless combo must result in more friction... [/quote]
Or perhaps the blowby occurs when the piston is a good ways down the bore when rod side loading is high making the piston rock and upsetting the ring seal and there is little energy left to extract? (Just a wild thought .) Can't explain why but my friend said he ran the same times before and after the freshenup when he went gapless, but definitely got less water in the oil.