Gas ported pistons
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Re: Gas ported pistons
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.
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Re: Gas ported pistons
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...........................stockcar5 wrote: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.
Re: Gas ported pistons
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.900HP wrote: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...........................stockcar5 wrote: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.
Carl Ijames, chemist not engine builder
carl ddott ijames aatt verizon ddott net
carl ddott ijames aatt verizon ddott net
Re: Gas ported pistons
you should get that keyboard looked at..your "m" button is sticking.900HP wrote: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...........................
Re: Gas ported pistons
If there's less blowby but no more power, the gapless combo must result in more friction...ijames wrote: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.900HP wrote: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...........................stockcar5 wrote: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.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
Re: Gas ported pistons
[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.
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.
Carl Ijames, chemist not engine builder
carl ddott ijames aatt verizon ddott net
carl ddott ijames aatt verizon ddott net