Ring gap?

[hotrodaj_2]

I have not called piston mfg. yet but was wondering what the ring gap should be for a 72.5mm piston. I got no paperwork with piston. I'm ready to put it in today but the only thing I still need to know is the ring gap. A buddy said he has never filed his rings, they always fit. I want to know hard numbers, I think I heard on this sit that .013 is a good all around gap number but not sure. Please help, wanna get this thing running.

 

[fioz600r]

Not sure if the BB called for stock gap? But the stock gap for the rings is 0.008~0.0014.

 

[stephen12091985]

ive never filed my rings either and no problamos here

 

[fioz600r]

I know whe I had my cylinder bored and he did the ring gap and said they were dead on out of the box. But that is with a Wiseco kit..........

 

[Wildcard2]

Good rule of thumb is .004" per inch of bore minimum ring gap. That being said 72.5 mm = 2.854" and would require a minimum ring gap of .012" and a maximum of around .017"

-Brandon

 

[hotrodaj_2]

Thanks alot guys, reps for all. Now I feel good about putting the piston in correctly. Piston is a Wossner. I never heard of this company, its a German forged piston,got it from L.A. Sleeve. Anybody ever use these?

 

[fioz600r]

Thanks alot guys, reps for all. Now I feel good about putting the piston in correctly. Piston is a Wossner. I never heard of this company, its a German forged piston,got it from L.A. Sleeve. Anybody ever use these?

They are reccommend by wildcard.. I dont think you have any other options....

 

[hotrodaj_2]

Well that makes me feel better. I know of quite a few pistons out there but I never heard of a Wossner. If a builder like Wildcard uses them then there good enough for me. Its hard to get info on these pistons. About all I know is there German,forged and have a low friction coating.

 

[fioz600r]

Well that makes me feel better. I know of quite a few pistons out there but I never heard of a Wossner. If a builder like Wildcard uses them then there good enough for me. Its hard to get info on these pistons. About all I know is there German,forged and have a low friction coating.

Have you tried google?

 

[hotrodaj_2]

Ya I G. oogled. Still havent found good info on piston. I've read the same old b/s about theres is the greatest thing on earth. I'm still looking, they seem to be very popular with the racing scene in Europe so they must be ok.

 

[hotrodaj_2]

Top end is now together and I did have to file rings. Rings were .008 gap out of box. General rule I was told was .012-.017, thanks again for those numbers. I could'nt find any ring info on a Wossner piston and seller took to long to find out for me. I gapped the rings to .012 and put it together.