I had to go to 0.017 for the top ring, Grant
rings, 87 mm pistons in a race motor. Less than
that and I broke rings. 0.014 for the middle
ring. Used to run less with Deves rings. You
may need a little less on the street, but it's
mainly a function of how hot things get. A few
thou too much is way, way better than one thou too little.
For your friend, 0.040 is a lot of end gap,
something is worn more than I'd be comfortable
with. Have to measure things to figure out where the wear is.
Tony Drews
At 03:02 PM 2/12/2016, Andrew Uprichard wrote:
>Content-Type: multipart/alternative;
> boundary="----=_NextPart_000_00A5_01D165AE.C8E327E0"
>Content-Language: en-us
>
>The manual for the TR3 says the ring gap should
>be 0.003 ? 0.010. But I have new pistons and
>rings marked that the gap should be 0.003 ?
>0.004 per inch diameter of the bore. 3 thou
>sounds awfully tight to me, but what do others think?
>
>On a related subject, a friend has an engine
>where the ring gap is 0.040. How much of this
>could be made up by simply replacing the
>rings? Or is there a point at which the only
>solution is bigger pistons +/- rebore?
>
>Andrew Uprichard
>
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