I've gotten two different answers from two different people at wiseco. so i'm posting here.

Wiseco 81.5mm pistons. approximate 10.0 compression. looking to boost say 10psi at the max (N/A for the break in period)

What should my ring gap be?

Wiseco (1st time) said Top ring .014 - .016 Bottom Ring .015 - .017

Called again Top Ring .016 Bottom Ring .018

Please help me to determine what size i should be using for my application. Thank you.

 

Well i'm running wiseco piston 84mm and cp rings and what jhon at RaceEngineering told me was between 16-18 top ring and 18-21 bottom, i went with 16 top and 19 bottom and i haven't had a problem.

 

As long as you are over you are fine last set up i had i was running 19 top and 24 bottom never had a problem. i changed it cause i had 20% leak on #3 piston due to a bad tunner who leaned it out on the dynno,and still like that it got tunnned by another tunner and made 340 whp @17lb which he said i had about 40 hp loss due to the leak down. Total leak down was 10%#1.. 9%#2.. 20%#3... 9%#4..

 

so .016 top / .018 bottom should be safe & make good power?

 

i'de say go with a little more on the bottom one just incase it won't hurt

 

^^ Thanks for your input

anyone else got their two cents on this subject?

looks like .016 top and .019 bottom as of now unless someone speaks up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DJ Gurgla GSR &raquo;</TD></TR><TR><TD CLASS="quote">so .016 top / .018 bottom should be safe & make good power?</TD></TR></TABLE>

that'll be fine, you have small bore so you dont need giant ring gaps

 

Cool. I'll probably aim for .018 and if i go over a tiny bit, i'll still be ok

 

i have 9.4-9.5 compression 81.5mm Wiseco pistons, what would my gap be?

 

http://www.laskeyracing.com/shop/ringgap.htm