i have a 84 mm block and pistons. the weisco pistons say gap the rings .004 per inch and a little more for performance engines. it's for a turbo motor so what should my ring gap be? any advice on how to do it? this will be my first time doing this.

 

Doesn't it say in the chart that you got with the pistons what the specs for a turbo application should be? If not I would call them to find out it should be a little more than an n/a gap.
There are a couple of ways you can gap your rings. The best one is go and buy a piston ring filer. The other way is by putting the ring in a vise (that has soft jaws) and filing it with a straight file, being sure to file straight and in one direction. When you measure the gap put the ring in the cylinder 1 inch from the top using the piston to keep it flat. Good luck.

 

Ok I looked at JE's website and an 84mm piston is 3.307" so you take your .004 per inch of bore gap and multiply by the bore. .004 X 3.307 = .013228" So you ring gap should be at least .013" .014-.016" would be better. When you measure you take the ring and make sure you have it right side up (usually a dot on the up side) and put it 1" down the cyl bore. You will see a small gap between the ends of the rings. Take a feeler gauge and put it in the gap. If the feeler gauge marked .013" is too big you have to get a ring grinder. Make sure you measure every ring in the cyl that it will be used in. To take some guess work out of this go to the local book store and get High Performance Honda Builders Handbook Vol. 1. On page 71 it shows you exactly what to do.
Do you have a ring compressor to put these in? Do you know how to line up the ring gaps when you install the pistons? Where do you live?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 19924ws &raquo;</TD></TR><TR><TD CLASS="quote">3.307" so you take your .004 per inch of bore gap and multiply by the bore. .004 X 3.307 = .013228" So you ring gap should be at least .013" .014-.016" would be better. </TD></TR></TABLE>

dont put the the ring gaps inline with either other. Put them 180degrees away from each other. Using a ring compressor makes it SOOO much easier the piston will slide into the bore. DO NOT BEAT on it.

 

Why was I quoted? I did not say they should be lined up. The ring gaps do not go 180 deg away from ea other, there are 5 rings, how would that work?
You cannot have a ring gap in line with a thrust surface (piston skirt) or a wrist pin. hold the piston skirt toward you. Have 0deg be 12 o'clock; starting from about 110deg (a little past 3 o'clock): put the bottom oil ring gap at 110deg, rotate 15deg clockwise spacer ring gap, rotate 15deg clockwise top oil ring gap, rotate 90 deg clockwise 1st ring gap, rotate 90 deg clockwise 2nd ring gap. when you're done thw 2 oil ring gaps and the spacer ring gap should all be between 3 and 6 o'clock, top ring gap should be between 7 and 8 o'clock, 2nd ring gap should be between 10 and 11 o'clock.


Modified by 19924ws at 5:02 PM 9/16/2003