2nd gapless ring

Does somebody had problem using gapless second ring on alky blown BBC.
Thanks

 

Has anyone tried the new gapless top groove rings?........

 

Mike your right. The use of a gapless ring will cause the top ring to unseat from the piston and cylinder wall, losing compression and power.This happens because the 2nd ring's function is oil control and it cannot seal compression on it's own. If you look at the way a gapless ring is made, they actually machine half the ring life away to accept the rail that makes it gapless. Leakdown figures are great, if your racing leakdown gauges. We've run cosistant 5.70's at 250MPH with a motor leaking at 15%. If gapless rings are so good, why don't the OEM's use them? The OEM's are actually opening up the 2nd ring gap to 1 to 1 1/2 times the top ring gap.
Here's how I got turned off by gapless rings. One night I was putting a fresh motor together. I always used cast iron taper faced 2nd's. All I could find was some gapless rings. I installed them. Motor in the rails, hat wide open and 48 volts. 150 PSI is all I had, normally I want 190PSI. After bumping the cam timing 8 degrees, I finally had 165PSI. Pulled no. 1 out, put on a junk 2nd ring I found in the trash, hat wide open and 48 volts. Wow, 240 PSI. Put the cam back where I started from, now I had 190PSI. Now I'm really mad because I have to take the motor all apart now. That's my story and I'm sticking to it.

 

Thanks guys for your quick response , i appreciate

 

Does this problem also apply to a dykes style top ring?

 

It doesn't matter what top ring style you run. Keep this in mind. When a ring is machined to accept the rail to make it "Gapless", you machine cast iron or ductile iron away and replace it with steel, thus making the ring heavier. The heavier the ring is, the earlier in RPM ring flutter occurs.

 

we used the 2 peice gapless 2nd rings and had no end of trouble with our SBC TAD and the thing used to pressurize the crankcase big time and then push oil out of the block to manifold seals, nearly tipped the car over several times let alone swapping lanes and clean up crews preparing when they saw us coming.
Until one night putting the eng together i broke one and all i had was C&A ZGS set so put them in and problem gone.
Now at 9800 and 54lbs boost we only have 4lbs positive pressure in the crankcase so weve stuck with C&A since.

 

Has anyone tried high alky boost with the 2-part top rings that are now available? I'd be curious about any feedback on those.........

Thanks.

 

Sorry, I must be misunderstanding something here. Aren't the C&A ZGS (Zero Gap) rings gapless? Is there a difference between the single gap (ie. C&A) and two piece ring? I tried the C&A last year and found way too much pressure in the pan (and everywhere else ). What is the best 2nd ring to use? Thanks for the help.

 

So is the ideal set up a dykes top ring with a reverse taper 2nd ring?

Cheers Ray

 

ringer!

And a high tension oil ring.